"SO Temporary Emergency Preparedness Plan" (General contractor - NUTECO) has been developed within SIP and approved by regulatory body. Radiating Protection Program (Contractor – Slavutich Laboratory of International Researches and Technologies (SLIRT)) has been developed and approved regulatory body.
Main SIP objective is transformation of the Shelter object into ecologically safe system from the point of view of personnel protection, radiological safety and environment safety.
SIP is organized on the basis of five purposes, which is necessary to achieve during its planned realization, and includes 22 tasks grouped according to these purposes.
OBJECTIVE 1. Collapse probability reduction (structural stabilization)
Task 1. Stabilisation and Shielding Design Integration and Mobilisation
Task 2. Stabilisation and Shielding of Western Section.
Task 3. Stabilisation and Shielding of Mammoth Beam and Southern Section.
Task 4. Stabilisation and Shielding of the Eastern and Northern Sections.
Task 5. Stabilisation of the Roof, Roof Supports, and Covering.
Task 6. Structural Investigation and Monitoring.
Task 7. Geotechnical Investigation.
Task 8. Seismic Characterisation and Monitoring.
OBJECTIVE 2. Collapse Consequences Reduction
Task 9. Emergency Preparedness.
Task 10. Dust Management.
Task 11. Emergency Dust Suppression System.
OBJECTIVE 3. Nuclear Safety Improvement
Task 12. Criticality Control and Nuclear Safety.
Task 13. Contained Water Management.
Task 14. Fuel Containing Material (FCM) Characterisation.
OBJECTIVE 4. Worker and Environmental Safety Improvement
Task 15. Radiological Protection Program.
Task 16. Industrial Safety, Fire Protection, Infrastructure and Access Control.
Task 17. Integrated Monitoring System.
Task 18. Integrated Database (Configuration Management).
OBJECTIVE 5. Long Term Strategy and Study for SO Conversion to an Environmentally Safe Site
Task 19. FCM Removal and Waste Management Strategy and Study.
Task 20. FCM Removal Technology Development.
Task 21. Safe Confinement Strategy.
Task 22. Implementation of a Safe Confinement to Support Deconstruction and FCM Removal.
Realization of all project tasks is interconnected. The course of works on one task determines a course of works on another. There are three types of the basic SIP stages with the purpose of the necessary information obtaining for works progress and for the project status definition:
- program – important decisions acceptance, influencing works progress or the beginning of new. 10 basic program decisions was defined, among them there are three key for successful SIP Project completion: P1 – Decision on stabilization, P8 – Decision on FCM removal strategy, P10 – Decision on New Confinement Strategy.
- regulatory – Ukrainian Regulatory Bodies permission obtaining. It was defined 18 basic regulatory stages.
- basic stages of tasks completion – stages specifying work, task completion, or completion of key activity within the task framework. It was defined 28 stages.
Phase 1: 1998 – middle of 2000 – Early Biddable Projects Stage (strategy and programs development, conceptual designing), preparatory works for Phase 2, including – implementation 2 of 5 urgent stabilization measures.
Transition period: middle 2000 – beginning of 2001 – Early Biddable Projects closeout and decision-making on the basic program stages.
Phase 2: beginning of 2001 – 2007 – equipment designing and procurement, facilities and systems construction and commissioning. This phase is characterized by Project transition to the stage of first phase results real implementation. There are, first of all, the works connected to building constructions stabilization, installation and commissioning of monitoring systems and the integrated database, FCM removal technology development and testing, water and dust management technical solutions realization, New Safe Confinement (NSC) erection and unstable constructions dismantling under its encasement. Solution of the specified tasks is supported by the Radiological Protection Program, Technical and Fire Safety ensuring, access control.
According to Memorandum of Understanding between G7 countries, European Commission and Government of Ukraine on Chornobyl NPP shutdown the special fund has been established – Chornobyl Shelter Fund (CSF) intended for assistance provision to Ukraine in existing "sarcophagus" transformation in safe and ecologically stable system by realization of the Shelter Implementation (SIP). G7 addressed to the Governments of the interested countries and to other donors to join the initiative for complete plan realization.
European Bank for Reconstruction and Development (EBRD) became the Administrator of Grants funds allocated by Chornobyl Shelter Fund’s Contributors and Donors. Ukraine and the European Bank for Reconstruction and Development signed the Framework Agreement on CSF activity in Ukraine, ratified by Verkhovna Rada of Ukraine on February 4, 1998. Taking into account Grant intended for Regulatory Bodies financing, the total cost of project’s works makes 768 million US dollars. 28 Donors countries and European Commission accumulate these funds in CSF.
Ukraine has taken obligation to allocate 50 million US dollars to Fund in form of property, works and otherwise.
European Bank for Reconstruction and Development manages Fund Activity on behalf and under supervision of Assembly.
Assembly:
• authorizes Fund Grants allocation;
• determines basic directions of activity, financed or are subject to financing from the Fund, carries out the general supervision of their realization by Bank;
• traces pledged funds payments in Fund and provision of Ukrainian financing supplying Grants for SIP;
• examines efficiency of activity, financed from Fund’s means;
• approves Fund’s Annual Budget and Financial Reports; organizes regular annual meetings in process of which Fund’s Financial Reports for the last fiscal year are submitted for approval. Assembly can hold meetings at any time when it is necessary or expedient.
Every Fund Contributor has the right to be presented in Assembly by the plenipotentiary representative without any compensation from Fund.
The main responsibility for financial and program management of Project realization is entrusted on European Bank for Reconstruction and Development.
The control and the organization of operational safety management pertain exclusively to Chornobyl NPP. Chornobyl NPP with the Consultant support manages the Project regarding to key programs and technical designs implementation.
SIP Project Management Unit (PMU), established from SSE ChNPP personnel and the personnel of the Consultant (consortium of companies Bechtel (USA), Battelle (USA), EDF (France)), manages the Time Schedule, Scope of works, project budget, project changes, Civil work and carries out administrative contracts management.
Phase 1 (1998 – 2000) is a phase of the information collection, investigations implementation, conceptual designs development, program decisions acceptances on their basis. These tasks performance was necessary for design and construction works deployment in Phase 2.
• Project Management Unit establishment.
Western and Ukrainian experts appointment, office creation and equipping.
• Nuclear Indemnification Program development, Project insurance, taxes exemption.
• Project planning, control and reporting means development. Integrated Base Time Schedule and Procurement Plan are the main control means. The information on SIP Procurement Plan can be obtained at an official EBRD Web- site http://www.ebrd.com/
• Evaluation of proposals, contracts awarding and Early Biddable Projects management. Early Biddable Projects packages (EBP) cover planning, development and project works according to main SIP tasks. Early Biddable Projects packages have been incorporated into 4 groups (A, B, C, D) for Terms of References similarity and included 17 of 22 SIP tasks. Such grouping has provided controlled packages quantity for tendering, contracts awarding and its subsequent management.
Early Biddable Projects scopes:
EBP À – Civil Construction (geotechnical investigations, building constructions monitoring system and infrastructures for stabilization measures designing, stabilization works determination, Decision on New Safe Confinement Strategy).
EBP B – operation and monitoring (industrial and fire safety, integrated monitoring system and database, seismic monitoring, radiological protection program).
EBP C – emergency systems (Emergency Plans development, Safety related Emergency Systems, dust and water monitoring).
EBP D – FCM removal strategy (Fuel Containing Materials Characterization, Decision on FCM removal prototype, RAW removal and Management Strategy).
More than 30 companies from the different countries has been involved in works on Early Biddable Projects implementation, among which Morrison Knudsen Ltd (USA), BNFL Engineering Ltd (Great Britain), NUKEM (Germany), SGN (France), JGC Corporation (Japan), RSC “Kurchatov institute" (Russia), and Ukrainian Scientific Research Institutes – SRI of Building Constructions, Kiev Scientific Research Project Institute "Energoproject", Interbranch Scientific and Technical Center "Shelter" NASU and others.
For all listed tasks deliverables were developed and approved, key program decisions have been accepted on their basis.
• two urgent stabilization measures performance
Ventilation Stack of ChNPP Units 3 and 4 foundation and strengthening repair – in 1998.
The total cost of the Project was US $ 2249966. Project financing was carried from tripartite payment: USA and Canada payment has made US $ 1800000, Ukraine – US $ 449966.
"Ukrenergobud" Company was executor of works.
This repair became the first international project provided direct improvement of Shelter object physical characteristics and safety increasing. Explosion of ChNPP Unit 4 in 1986 has seriously damaged ventilating stack supports system and its foundation. Investigation and analysis, carried out in 1996, have allowed to conclude, that the constructions are in emergency condition and its collapse probability is high enough. As a result of the stack collapse probability of the subsequent lethal dose obtaining by several thousand persons worked at ChNPP and adjacent territories was not excluded.
Ukraine provided the personnel for works performance, radiation protection, radiation monitoring of construction and the necessary information. Shelter Object personnel managed works implementation and was fully responsible for works performance.
USA and Canada experts provided the technical assistance and consultations, carried out general supervision on project performance, and evaluated works progress, conformity of the project realization to the objective. Quality and safety assurance was supervised together with the Ukrainian side.
Average value of an external irradiation doze of the personnel, implemented these works, has made less than 1 cZv. Exceeding of individual irradiation dozes control levels – 4 cZv wasn’t fixed.
B1 and B2 Beams support strengthening – 1999.
The total project cost made US $ 2844079.
“Ukrenergobud” company was executor of works.
B1 and B2 Beams are one of main elements of Shelter object’s Central Hall and Deaerator stack covering. As support for beams was ventilation shafts and wall on the axes 50 considerably damaged as a result of accident. In turn, on B2 beams blocks leans pipe covering above the Central Hall and covering plates are installed on B1 Beams. Beams are designed for vertical loading from their weight, weight of radiation protective concrete layer and loading from snow.
Installation of beams was carried out in extreme conditions of the high radiation hazard in the absence of the reliable data about the level of supporting constructions damage. As a result of the subsequent surveys, calculations and expert assessments, works on B1 and B2 Beams supports strengthening have been included in the list of urgent stabilisation measures which should be immediately implemented, their failure could lead to a collapse of a considerable part of a covering with a total area about 3,5 thousand m2.
Works inside object on high levels in the extreme conditions connected to the wide temperatures drops and high radiation fields became main peculiarity of the project. All operations on bioprotection and attached implements installation, shuttering manufacturing for concreting and welding works implementation were previously perfected on specially created mockup - simulator in Chornobyl.
Average value of the external irradiation of personnel involved in works according dosimetric orders, made 1,31 cZv. Control level of individual irradiation dozes exceeding – 2 cZv – wasn’t fixed.
Besides within the framework of the first project phase a number of works, promoting Shelter object safety and infrastructure improvement has been implemented:
- the prototype of neutron monitoring system "Pilot" has been installed;
- works on Shelter roof hermetization are executed. 5 stages of this task have reduced water penetration inside SO through roof thinnesses;
- roads for radioactive wastes and building construction transportation are built;
- operation testing of Shelter object Fuel Containing Materials database is started;
- removal and disposal of the top ground layer, fencing, electrosupply, cold warehouses block construction at the small construction site, intended for stabilization measures was executed;
- internal power supplies networks of Unit 4 are reconstructed, the fireproof covering of cable lines is executed;
- site preparation for clothes change facility for 1430 persons and other works are started.
Thus, during the period of Phase 1 realization significant progress in all basic areas, determined by SIP plan strategy and the works schedule has been achieved.
The Shelter Object was constructed within 206 days. The accelerated time of its construction led to appearance of design flaws, in particular:
1. The bearing structures of the supporting walls (survived constructions of the Power Unit 4) and their junctions were significantly damaged, overloaded with the weight of the building structures that were dropped on them, and materials used during the accident elimination
2. Exposed reinforcing bars of the reinforced concrete structures and metal structures are corroded
3. The structures constructed after the accident are freely supported on the bearing structures without a physical connection and are retained without welded or bolted connections
Basic information Accident and its Elimination
The international competition of designs and technical solutions was announced in 1992 to transform the Shelter Object into an environmentally safe system, which was the first step towards the international cooperation.
Shelter Object’s design defects were described in 1995 in the report of the Alliance company and it contains the following conclusions:
1. The operating Shelter is unstable and seismically isn’t resistant. Urgent measures should be undertaken to stabilize it and delay is unacceptable
2. Due to the high radiation level and the actual state of existing structures long-term stabilization of the Shelter Object was considered as impossible. The state of the Shelter does not allow retrieving the radioactive materials
3. New protective encasement should be constructed to allow Unit 4 dismantling
4. The facility should be constructed for radioactive waste storage and management
5. Ukraine isn’t capable to provide financing for such a project without outside help
In June 1997, the G7 meeting accepted the "Shelter Implementation Plan" (hereinafter: SIP), developed under the assistance of the European Commission, Ukraine, United States and a team of international experts. This plan defined the basic concept, including a number of steps aimed at bringing the Shelter Object to an environmentally safe state.
Objectives of the Shelter Implementation Plan:
1. Reduce the Shelter Object collapse probability
2. Reduction of consequences in case of the collapse
3. Nuclear safety improvement
4. Improve the personnel and the environment safety
5. Develop a long-term strategy and investigate ways to transform the Shelter Object into an environmentally safe system
The Donor countries pledging conference took place November 20, 1997 in New York. These countries committed to allocate funds for this Plan implementation in a specially established Chornobyl Shelter Fund. The Fund administration was entrusted to the European Bank for Reconstruction and Development.
The Shelter Object transformation into an environmentally safe system is carried out in 3 stages::
1. Stabilization. Stabilization of the existing facility state and increase of its operational reliability
2. Preparation for transformation. Creation of additional protective barriers, in particular New Safe Confinement. This will provide the necessary conditions for the subsequent stages of transformation, as well as will protect the personnel, general public and environment. In addition, at this stage preparatory work is planned to develop a technology for Fuel Containing Masses retrieval from the Shelter Object and to create infrastructure for Radioactive Waste Management
3. Transformation. Fuel Containing Masses and Radioactive Waste retrieval from the Shelter object and their disposal. Shelter object decommissioning
SIP stabilization stage was implemented within 2004-2008.
The urgent stabilization measures were implemented during 4 years, which allowed strengthening the main most vulnerable Shelter Object's elements. At this stage the Shelter western wall was strengthened, the emergency slabs were stabilized, the Shelter northern zone, the southern zone roof and the western and eastern Mammoth Beam supports construction were reinforced, the light roof of the Shelter Object and the Ventilation stack of Units 3 and 4 were repaired.
These works allowed extending the Shelter Object lifetime for another 15 years.
The stage of preparation for the transformation stipulated the construction New Safe Confinement (hereinafter: NSC) — a protective structure, which includes a complex of technological equipment for FCM retrieval from the damaged 4th Power Unit, radioactive waste management and the safety assurance for the personnel, the general public and the environment.
Preparatory works for the NSC construction were started in 2005. In 2010 the site for the confinement construction was prepared.
Basic information: The project "New Safe Confinement Construction"
November 29, 2016 — the NSC Arch was installed in the design position above the Shelter Object.
In 2016, the Chornobyl NPP obtained a permission to operate the Shelter Object's Integrated Automated Monitoring System (IAMS).
The system is designed to perform automated monitoring of the Shelter Object's condition and improve the nuclear, radiation and general technical safety of this facility, including increase of emergency preparedness. The IAMS consists of a Nuclear Safety Monitoring System, Radiation monitoring system, system for building structures condition monitoring and seismic monitoring system.
Within the third stage of the transformation it is planned to retrieve the Fuel Containing Masses from the Shelter Object, to transfer them to the controlled state by storing them inside the protective barriers or by disposal in geological repositories for radioactive waste. The goal of this stage is to transfer the facility into an environmentally safe state.
The available level of knowledge is insufficient to identify the timeframe for the Stage 3 implementation. Priorities for the nearest future are the NSC commissioning and transition to dismantling of Shelter Object's unstable structures by 2023 — the final service life of the Shelter Object stabilized structures.
Program decisions are key stages, constructed on the integrated data accumulated during previous years of Project implementation. Program decisions are accepted for definition of SIP complex realization ways and are the indication for transition to the following stage of the task solution.
Decisions are made by the Customer and are agreed by the European Bank for Reconstruction and Development (EBRD) on behalf of Donors Assembly at the technical expertise executed by the International Advisory Group (IAG) and by an Independent Expert Team of Ukraine.
Program decision P1. Stabilization and Shielding Strategy.
Program decision P2. Decision on roof stabilization, supports and constructions Strategy.
Decisions P1 and P2 in a complex determine necessary and sufficient scope of measures on Shelter object stabilization for the term of 10-15 years. Decision P1 determines the contents of SO current condition stabilization (short-term and long-term measures and unstable constructions dismantling) taking into account New Safe Confinement Concept. According to this Concept, the controllable barrier will be created between sources of radiological contamination inside SO and environment, ensuring realization of Fuel Containing Materials (FCM) removal and Radioactive Waste Management Strategy.
Decision P2 confirms necessity and specifies scope of stabilization measures on a roof and other decisions accepted in P1. These decisions are the indication to transition to the designing and construction stage with the purpose of practical SO collapse risk reduction up to time and during New Safe Confinement construction.
According to these decisions it is anticipated to perform 8 stabilization measures including deaerator stack, "Mammoth" beam support, Western wall of "Shelter" stabilization.
Program decision P3. The report on a building construction condition and the monitoring system of building construction condition.
The current status of "Shelter" is linked to the certain risk of partial constructions collapse and radioactive dust release that will have negative influence on the personnel and an environment. Decision P3 is a basic point in SIP Task 6 realization on creation of initial monitoring system of constructions status (MS CS) in real time and proves necessity of such monitoring implementation.
MS CS at interaction with other monitoring systems which creation is stipulated by SIP, will provide implementation of the complex monitoring of SO constructions integrity and a condition during all stages of stabilization measures, dismantling measures and New Confinement construction.
The decision on MS CS creation maid by the operating organization, is based on Shelter object investigation, on results of the works executed during SIP realization, on results of existing SO monitoring systems operation. This decision is the important part at transition to the stage of Shelter transformation into ecologically safe system.
MS CS will carry out automated collection and transformation of the information from the monitoring detectors in physical values parameters, and to carry out their comparison with control and critical levels. Monitoring detectors will fix vibrations, linear deformations and displacement, inclinations tilting and other parameters of a constructions condition. MS CS also will monitor of environment parameters: temperature, speed and a direction of a wind, etc.
The system will work in free running mode, and will be connected by information channels to Integrated Monitoring System (IMS). Using information support of IMS and MS CS SO personnel will make a decision on these or those situations.
Program Decision P4 Desosion on Seismic Monitoring System.
Program Decision P4 confirms necessity of Seismic Monitoring System creation in ChNPP site area. Such system is necessary for data collection on seismic characteristics of area of ChNPP location, more exact assessment insurance of dismantling methods and seismic event consequences, timely notification of ChNPP operational personnel on seismic events with the purpose of the analysis, monitoring, check and other operative actions performance.
Five seismic monitoring stations should be installed in ChNPP local zone (0-40 kms), one of which directly (less than 1 km) near "Shelter" should be installed for data obtaining on an earth basis and the Shelter object foundation interaction. Five stations is the minimal desirable quantity necessary for unique decisions calculations on location, depth and time of a signal receipt. The seismic stations data will be transferred on the telemetric channel to completed monitoring data system.
Program decision P5. Criticality and Nuclear Safety.
In the decision all subsequent measures connected to criticality monitoring necessity will be determined. These measures will affect determination of processes concerning criticality condition limitation proceeding passively or actively, and also on preconceptual designing of stages or systems, used for the criticality monitoring when it is necessary. Acceptance of the given decision will be influenced by expenses factor for its implementation, and also objectives in view of nuclear and industrial safety, personnel and environment safety increasing.
Program decision P6. Shelter object Water Management.
P6 should solve the Water Management problem inside the object: water inflow source, their location and characteristics, available capacities of premises with ChNPP equipment for water treatment and storage.
The contained in SO water promotes reduction of constructions durability so, collapse risk increases. This destruction mechanism is revealed in reduction of concrete durability, damaged as a result of accident, in corrosion of reinforcing steel and metal constructions. To reduce such risk, the water management system should collect water before its ingress inside SO. The previous attempts of Shelter object hermetization were linked to high doses rates and have not completely eliminated a possibility of their ingress inside SO. There is a many ways of water ingress in object, and high dose rates at roof significantly eliminate time for revealing and hermetization of all found looses.
It is possible to divide contaminated water flows, considered in SIP on internal and external. Waters inside the Shelter are internal. These waters have various radio-activity levels, in some premises they are highly radioactive and contain organic substances, used for dust suppression. External waters flow down from external Shelter surfaces and ingress in a local zone.
For the period prior to the New Confinement construction beginning the decision will consist in waters removal from SO premises, creation of unit for the preliminary treatment for radio-activity decrease up to the required by ChNPP norms. The subsequent treatment will be carried out on the available at ChNPP equipment. Besides the opportunity of local improvement of temperature conditions and humidity level inside the Shelter will be considered to reduce a condensation level in premises and in areas where water presence results in building constructions deterioration and to risks of industrial safety increase. As to full-scale Shelter roof hermetization, its implementation is recognized inexpedient, taking into account significant dose rates and that fact, that New Confinement will be constructed in 5 years. It is noted, that it is necessary to analyse more in details "expense - benefit" of local hermetisation for water ingress reduction in SO.
Program decision P7. Fuel Containing Materials (FCM) removal and Radioactive Waste (RAW) Management Strategy.
This decision determines the subsequent measures implementation, realization of which is stipulated outside SIP frameworks (except for determined in Scope Plan) and is the important step confirming SIP actions compatibility with preparation for final Shelter transformation into ecologically safe system. In SIP frameworks Decision P7 is preliminary and should be confirmed by final Decision P8 on FCM removal and RAW management Strategies.
Basically strategy provides:
• FCM removal during New Confinement life time (100 years).
• The removal duration estimated on the preliminary data, makes 40-50 years.
• Advantage is given to Radioactive Waste, low and medium active, and highly active, transportation from Shelter directly to Final Disposal (Geological Disposal or other created within the framework of the National Program of RAW Management). That will exclude expenses for Long-term Storage Facility construction outside New Confinement only for FCM.
• Selective FCM removal after unstable constructions dismantling and FCM removal technology test completion.
• Steam removal will begin after solution of removed FCM storage questions.
• Implementation of completion works on Shelter transformation into ecologically safe system after FCM removal.
• To use existing practice for Wastes Management generating during SIP realization.
Program decision P8. FCM removal Strategy investigation and development.
This is final decision on definition of optimum time and strategy of FCM removal. It will determine the final program recommendation on use of FCM removal and disposal methodology and terms. The decision and the recommendation will be based on FCM characterization results, FCM removal and RAW Management Program, and on FCM removal demonstration results and other factors. Performance of this decision will give clear conception on FCM removal, management and packing possibilities inside the Shelter within determined terms.
This decision represents the formal agreement concerning determination of FCM removal terms and techniques. Performance of the decision will consist in corresponding document signing in which completion of FCM removal and RAW Management Program and also Researches Program will be submitted.
Program Decision P9. FCM removal prototype.
Decision P9 determines necessity of development and implementation of FCM removal technology prototype tests, FCM removal demonstration in real Shelter object conditions, its structure, doses and cost estimation.
Demonstration of FCM removal and RAW Management at SO site should confirm main provisions of P7 Decision. That will considerably reduce the existing uncertainty linked to cost and doses estimations.
Uniqueness of such works, absence of their realization experience and necessity of FCM removal Strategy predesign development confirmation cause necessity of FCM removal demonstration. The following step will be designing a complex of operations of FCM removal technological chain (technology development).
Decision P9 proposes a specific zone in SO for demonstration experiment realization (a premise on the bottom levels) and specific FCM congestion. The general scheme of tests carrying out will consist of operations on access creation, a mechanical fragmentation of the chosen congestion, and transportation to the equipped interim storage.
Program Decision P10. New Safe Confinement Strategy (NSC).
Decision P10 determines strategy of Safe Confinement creation as a complex of constructions, systems, sites and equipment. During implementation of activity on Shelter object transformation Safe Confinement should restrict radiation influence on personnel, population and environment by the established borders under normal SO operation condition and at infringements of normal operation, emergencies and accidents, including accidents during unstable constructions dismantling and FCM and RAW Management. Safe Confinement as multifunctional facility with life time 100 and more years allows to carry out the third stage of Shelter object transformation Strategy (approved by the Decision ¹5 of Governmental Commission on complex solution of ChNPP problems, dated April 18, 1997), namely – Fuel Containing Materials removal, their conditioning with the subsequent safe storage.
The carried out researches confirmed necessity of New Safe Confinement construction. The stabilization measures within SIP frameworks will allow safe operation of facility only during 15 years. Therefore with the purpose of probable collapse risk reduction some constructions will be dismantled after New Safe Confinement construction.
Results of the researches connected to FCM removal and RAW Management strategy also confirm necessity of additional barrier creation which will reduce to a minimum distribution of radioactive substances in an environment during implementation of future operations on FCM removal and RAW Management.
ARCH type construction is accepted in Decision P10 on which are conducted designing works.