A technique for computing bowing reactivity feedback in LMFBR's

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5745071

Finck, P J

During normal or accidental transients occurring in a LMFBR core, the assemblies and their support structure are subjected to important thermal gradients which induce differential thermal expansions of the walls of the hexcans and differential displacement of the assembly support structure. These displacements, combined with the creep and swelling of structural materials, remain quite small, but the resulting reactivity changes constitute a significant component of the reactivity feedback coefficients used in safety analyses. It would be prohibitive to compute the reactivity changes due to all transients. Thus, the usual practice is to generate reactivity gradient tables. The purpose of the work presented here is twofold: develop and validate an efficient and accurate scheme for computing these reactivity tables; and to qualify this scheme.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5745071
• Report Number(s): CONF-8709192-3; ON: DE88002941
• Country of Publication: United States
• Language: English

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COMPUTER CODES
CREEP
EPITHERMAL REACTORS
EXPANSION
FAST REACTORS
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