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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