End Effects in the Criticality Analysis of Burnup Credit Casks

Conference · Sun Nov 11 04:00:00 EST 1990

OSTI ID:6625955

Brady, M. C. ^[1]; Parks, C. V. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

A study to evaluate the effect of axially dependent burnup on k_eff has been performed as part of an effort to qualify procedures to be used in establishing burnup credit in shipping cask design and certification. This study was performed using a generic 31-element modular cast-iron cask (wall thickness 33.1 cm) with a 1-cm-thick borated stainless-steel basket for reactivity control. Fuel isotopics used here are those of the 17 ˙ 17 Westinghouse assemblies from the North Anna Unit 1 reactor. Virginia Power (VP) provided detailed spatial isotopics for the fuel assemblies in-core at beginning-of-cycle 5 (BOC-5) as generated from their PDQ analyses. Twenty-two axial planes were defined in the original VP data. The isotopics used in this study were for a 3.41 initial wt % ²³⁵U and an average burnup of 31.5 GWd/MTU.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6625955
• Report Number(s): CONF-901101--10; ON: DE90012942
• Country of Publication: United States
• Language: English

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BURNUP
CASKS
CONTAINERS
CRITICALITY
DESIGN
ENERGY SOURCES
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MATERIALS
NUCLEAR FUELS
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REACTOR MATERIALS
SPENT FUEL CASKS
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TRANSPORT