Equivalency Relations for Mixtures of Nuclides in Shipping Casks 9972-9975

Conference · Wed Dec 14 04:00:00 EST 1994

OSTI ID:10193877

Niemer, K. A. ^[1]; Frost, R. L. ^[1]; Williamson, T. G. ^[1]

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1. Westinghouse Savannah River Co., Savannah River Site (SRS), Aiken, SC (United States)

Equivalence relations required to determine mass limits for mixtures of nuclides for the Safety Analysis Report for Packaging (SARP) of the Savannah River Site 9972, 9973, 9974, and 9975 shipping casks were calculated. The systems analyzed included aqueous spheres, homogeneous metal spheres, and metal ball-and-shell configurations, all surrounded by an effectively infinite stainless steel or water reflector. Comparison of the equivalence calculations with the rule-of-fractions showed conservative agreement for aqueous solutions, both conservative and non-conservative agreement for the metal homogenous sphere systems, and non-conservative agreement for the majority of metal ball and-shell systems. Equivalence factors for the aqueous solutions and homogeneous metal spheres were calculated. The equivalence factors for the non-conservative metal homogeneous sphere systems were adjusted so that they were conservative. No equivalence factors were calculated for the ball-and-shell systems since the SARP assumes that only homogeneous or uniformly distributed material will be shipped in the 9972-9975 shipping casks, and an unnecessarily conservative critical mass may result if the ball-and-shell configurations are included.

• Research Organization: Westinghouse Savannah River Co., Savannah River Site (SRS), Aiken, SC (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 10193877
• Report Number(s): WSRC-MS--94-0354; CONF-941207--11; ON: DE95002687
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
420203
420204
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Actinide Isotopes
Equivalence Relations
Evaluated Nuclear Data File (ENDF)
Fissile Materials
HANDLING EQUIPMENT AND PROCEDURES
Metal Ball and-Shell Systems
Metal Homogenous Sphere Systems
Mixtures of Nuclides
Nuclear Criticality Safety Program (NCSP)
SHIPPING CONTAINERS
Safety Analysis Report for Packaging (SARP)
Savannah River Site
Shipping Casks
Spent Nuclear Fuel