SCALE-4 Analysis of LaSalle Unit 1 BWR Commercial Reactor Critical Configurations

Gauld, I. C.

Oak Ridge National Laboratory

关键词: Criticality;    Sensitivity;    Wastes;    Gadolinium;    Design;   

DOI  :  10.2172/769368
RP-ID  :  ORNL/TM-1999/247
RP-ID  :  AC05-00OR22725
RP-ID  :  769368

美国|英语

来源: UNT Digital Library

【 摘 要 】

Five commercial reactor criticals (CRCs) for the LaSalle Unit 1 boiling-water reactor have been analyzed using KENO V.a, the Monte Carlo criticality code of the SCALE 4 code system. The irradiated fuel assembly isotopics for the criticality analyses were provided by the Waste Package Design team at the Yucca Mountain Project in the US, who performed the depletion calculations using the SAS2H sequence of SCALE 4. The reactor critical measurements involved two beginning-of-cycle and three middle-of-cycle configurations. The CRCs involved relatively low-cycle burnups, and therefore contained a relatively high gadolinium poison content in the reactor assemblies. This report summarizes the data and methods used in analyzing the critical configurations and assesses the sensitivity of the results to some of the modeling approximations used to represent the gadolinium poison distribution within the assemblies. The KENO V.a calculations, performed using the SCALE 44GROUPNDF5 ENDF/B-V cross-section library, yield predicted k{sub eff} values within about 1% {Delta}k/k relative to reactor measurements for the five CRCs using general 8-pin and 9-pin heterogeneous gadolinium poison pin assembly models.