On the 9th of November 2013 the fourth block (B-4) of the ChNPP II Generation Ventilation Stack (VS-2), consisted of a pipe and a supporting structure with total weight of 45 tons, was dismantled.
Fragmentation of the previously dismantled blocks is underway within the specially prepared areas. 65 fragments of VS-2 have been received for temporary storage at the Turbine Hall.
The monitored radiation parameters do not exceed the design-based reference levels.
On November 5, 2013 the second block of ventilation stack of ChNPP 2-nd generation was dismantled.
The second block is a supporting structure of the stack; its weight is 56 tons. The second block as well as the first one dismantled on October 31 was placed within the area specially prepared for the subsequent fragmentation.
The radiation parameters under monitoring do not exceed the design-based reference levels.
October 31, 2013 the first block of Ventilation Stack (VS-2) of ChNPP 2 generation has been dismantled. Weight of the dismantled block is 33 tons. The block is located at specially prepared site where it will be fragmented to move it in Unit 3 Turbine Hall for temporary storage.
Radiation situation parameters were monitored continuously during the work. Controllable parameters of the radiation situation do not exceed the design control levels. Additional radiation survey of dismantled block and its preparation for fragmentation is underway.
Dismantling of VS-2 will be performed by sequentially removing of separate blocks using the high capacity crane DEMAG. In total 7 blocks will be dismantled with weight 330 tons.
Planned completion date for VS-2 dismantling is December 10, 2013.
For purposes of ensuring the safe work performance on dismantling of the II Generation Ventilation Stack (VS-2) it was decided to continue the preparatory works at the site.
The activities are performed by “Ukrtransbud” Corporation.
Over a period passed from the contract awarding, the Contractor performed the design works, all necessary permissions from the regulatory bodies were obtained, the preparatory works were executed, and the crane of large load capacity was commissioned.
The SSE ChNPP Radiation Safety Shop carried out the radiation survey of VS-2. The continuous radiation monitoring within the work execution area are underway by this Shop.
The dismantled fragments of VS-2 will be placed for temporary storage at Unit No.3 Turbine Hall’s premises. This Power Unit after removal of spent nuclear fuel has a status of radioactive waste management facility.
The State Nuclear Regulatory Authority of Ukraine issued to the SSE ChNPP a separate authorization for operation of ChNPP II Generation New Ventilation Stack (NVS).
According to this document the SSE ChNPP is allowed to operate the New Ventilation Stack and associated systems of the ChNPP II Generation provided that the strict control over the state of the NVS building structures is performed in accordance with the Regulations.
For your reference: The Contract on construction of the New Ventilation Stack and associated systems of the Chernobyl NPP II Generation was signed on July 15, 2010, with the Russian-Ukrainian Consortium “Ukrytiye”(CJSC “Atomstroyexport”, Russia, and CJSC “Ukrenergomontazh”, Ukraine), as with the winners of the competitive tender carried out by the EBRD. The Project is included into the International Technical Assistance Program of Shelter Object Transformation into an Ecologically Safe System (SIP) financed at the expense of the Chernobyl Shelter Fund administrated by the EBRD.
The NVS represents a metal tower 50 m in height (125 m from ground level) with a gas vent pipe 6 m in diameter located inside it. It was installed at the existing reinforced-concrete structures of the Chernobyl NPP II Generation main building and equipped with the radiation monitoring system and light fencing system. The NVS is commissioned instead of the existing Ventilation Stack (VS-2) to be dismantled in the nearest time.
WANO Technical Support Mission is completed at Chernobyl NPP, which took place since 15 to 18 October. The event was held at the request of ChNPP and was devoted to Safety assurance problems during preparation of uranium- graphite units for long-term storage under supervision (preservation).
The purpose of the mission in the first turn, was to share experience and knowledge in the field of NPPs decommissioning, as well as review of approaches and technologies, used in the uranium-graphite reactor decommissioning and optimization of ChNPP Units decommissioning strategy.
| June 11, 2001 – establishment of SSE Chornobyl NPP |