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Safe Type of Transference for Spent Fuel

#1288


Safe Transference of Spent Fuel Assemblies from Near-Reactor Storage Pools to Long-term "Dry" Storage

Tech Area / Field

  • FIR-NSS/Nuclear Safety and Safeguarding/Fission Reactors
  • FIR-MOD/Modelling/Fission Reactors
  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
3 Approved without Funding

Registration date
26.05.1998

Leading Institute
VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Supporting institutes

  • NPO Mayak, Russia, Chelyabinsk reg., Oziorsk\nBeloyarsk NPP, Russia, Sverdlovsk reg., Zarechny\nNIKIET (Sverdlovsk Branch), Russia, Sverdlovsk reg., Zarechny

Project summary

The main goal of the project is a design substantiation and choice of recommended modes of operation for safe transfering of spent fuel assemblies (SFAs) from near-reactor delay ponds to long-term "dry" storage. It is proposed to focus one's attention at corrosion of fuel, structural materials and jackets of fuel assemblies. The work on this project will be carried out using water reservoir of graphite reactor at Beloyarsk NPP as an example. The solution of the goal is based on a system analysis of information accumulated during NPP operation and on the base of production codes, physical and chemical models available at VNIITF and NIKIET SB. It is anticipated that within the framework of the project the following tasks will be solved:

· study and system analysis of accumulated during NPP operation data on corrosion behavior of fuel and materials of fuel assemblies (FAs) within a reactor and in a storage delay pond;


· assessment of possible corrosion destruction during operation and further storage of FAs in delay ponds on the basis of conducted analysis;
· safety assessment of storage of SFAs of graphite reactors in water reservoir in case of corrosion process in hermetically sealing jackets of fuel rods (FRs) with further destruction of nuclear fuel and formation of local zones of its accumulation;
· development of recommendations on transferring of SFAs from "wet" storage in delay pond towards "dry" storage in container;
· development of recommendations on prolongation of a storage period in reservoirs for SFAs;
· simulation of corrosion destruction of fuel in SFAs with damaged jackets during "dry" storage;
· assessment of nuclear safety of damaged FRs at their prolonged "dry" storage when the process of corrosion destruction is still under way;
· assessment of nuclear safety of "dry" storage in an emergency in accordance with IAEA regulations.

The main objective of this project is to join efforts of highly-qualified specialists dealing with weapon production and to reorient them for solving the urgent issues of nuclear power engineering.

The project successful implementation will allow to estimate risk of SFAs storage at "wet" storage facilities and to develop specific recommendations and criteria for transferring SFAs to "dry" storage. The analysis of possible accidents will allow to increase safety, to reduce possible detriment to a minimum, to preclude radioactive contamination of a territory.

Expected Results


1. Project successful completion will make it possible to determine risk degree at SNF storage in "wet" conditions and to specify safety criteria.
2. It is anticipated to develop specific recommendations for transference of SFAs with damaged fuel rods' jackets to "dry" storage in containers.
3. The analysis of possible accidents will allow to increase safety at conducting the all necessary operations, to minimize possible damages, to eliminate radioactive contamination of a territory.
4. The results obtained during the project fulfilment will allow to elaborate the requirements on prolongation of storage period for SFAs contained in water basins.
5. Simulation models obtained during the project progress will allow to choose operational procedures for transference of SFAs with damaged jackets from water basins to "dry" storage facilities not only at Beloyarsk NPP, but at the other NPPs where the same problem occurs.


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