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الثلاثاء، 25 مارس، 2014

Burn up Credit in Criticality Safety of PWR Spent Fuel

Title            :   Burn up Credit in Criticality Safety of PWR Spent Fuel
Author         Rowayda Fayez Mahmoud
Collection   M.Sc. Nuclear 

Abstract:  
The criticality safety calculations were performed for a proposed design of a wet spent fuel storage pool. This pool will be used for the storage of spent fuel discharged from a typical pressurized water reactor (PWR). The mathematical model based on the international validated Codes, WIMS-5 and MCNP-5 were used for calculating the effective multiplication factor, kelf, for the spent fuel stored in the pool. The library data for the multi-group neutron microscopic cross sections were used for the cell calculations. The kclf were calculated for several changes in water density, water level, assembly pitch and burn up with different initial fuel enrichment and new types and amounts of fixed absorbers. The results of the calculations confirmed that the effective multiplication factor for the spent fuel storage is sub-critical for all normal and abnormal states. The future strategy for the burn up credit recommends increasing the fuel burn up to a value greater than 55GWO/MTU, which requires new fuel composition and new fuel cladding material.

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