By this time the second double-walled canister (DWC) has been filled with spent nuclear fuel (SNF). For this purpose, 93 spent fuel assemblies (SFAs) were transported from the old SNF wet-type storage facility (ISF-1) during the last days of November. According to the ChNPP SNF management technology, each assembly was cut into two bundles, placed into fuel tubes and then into the DWC.
Within the next two weeks the staff responsible for the ChNPP SNF management will seal the DWC: i.e. welding of the internal lid, gas and vacuum drying, filling the canister with helium, sealing of the internal lid, welding of the external lid, filling the space between DWC shells with helium and sealing of the canister’s external lid..
In the course of all these stages, the quality of sealing weld joints will be continuously monitored by visual check and liquid penetrant test of weld joints. Following the DWC filling with helium, air-tightness of the DWC vessel internal and external shells will be checked.
As a reminder, the first DWC was loaded into the ISF-2 concrete storage module on November 18 this year. As of December 1, 186 SFAs were transported from ISF-1 to ISF-2.
On November 30, 1986, the Deed of the State Acceptance Commission on commissioning of a protective structure above the destroyed Unit 4 of Chornobyl NPP was signed, it was named the Shelter object (hereinafter - SO). And this year is the 34th anniversary of the completion of perhaps the most dangerous and complex construction process in the history of domestic nuclear energy. Here are some interesting facts about the features of this facility, which for 30 years, until New Safe Confinement sliding, has become a physical barrier from the destroyed as a result of the accident Unit.
On November 29, 2016, the official ceremony of New Safe Confinement (NSC) Arch installing in the design position took place. This event was preceded by four years of hard and painstaking, without exaggeration - creative work of Chornobyl NPP team, the main construction contractor, NOVARKA joint venture (consortium consisting of two French companies: Bouygues and Vinci), a number of foreign and Ukrainian subcontractor organizations, research institutions at institutes.
Following 
On 29th of October, the Ambassador Extraordinary and Plenipotentiary of France to Ukraine, Mr. Etienne de Poncins, and Economic Attaché, Ms. Mathilde Arjakovsky, made an official visit to Chornobyl NPP.