THE EFFECT OF INCREASING TEMPERATURE ON K-EFF FOR FISSILE MATERIAL OUTSIDE REACTORS

Kessler, S.

关键词: BUILDING MATERIALS;    CONCRETES;    CRITICALITY;    CROSS SECTIONS;    DIMENSIONS;    FISSILE MATERIALS;    MELTING POINTS;    OXIDES;    PLUTONIUM;    SAFETY;    SAVANNAH RIVER PLANT;    TANKS;    THERMAL EXPANSION;    WASTE PROCESSING;    WASTES;   

DOI  :  10.2172/961606
RP-ID  :  SRNS-TR-2009-00219
PID  :  OSTI ID: 961606
Others  :  TRN: US0903489

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Nuclear Criticality Safety Evaluations typically employ room temperature cross sections, material densities, and dimensions. Processes that have been and are in development for conversion of legacy wastes in tanks, e.g., Waste Treatment Project (WTP) at the Hanford Remediation Site and Defense Waste Processing Facility (DWPF) at the Savannah River Site, utilize melters that operate at elevated temperatures, 1500 to 1900 C. The applicability of room temperature data to processes such as these has been questioned. Also questioned was the applicability of room temperature data for the analyses across the Savannah River Site (SRS) where the temperature may be elevated, such as in a postulated fire. This analysis was performed to examine the effect of temperature over the relatively small range encountered in normal and abnormal operations at SRS that does not include DWPF melters. This analysis documented herein is limited to fast systems of fissile metal and oxide cylinders on concrete at temperatures no greater than 640 C, the melting point of plutonium. Because thermal expansion data for various types of structural materials was not readily available, structural materials were not included in the analysis.