Relative importance of attenuation and reactivity effects in explaining local and global BWR neutron noise

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6030404

Sweeney, F J; Robinson, J C

Recent studies show that in-core neutron detector response to boiling can be described in terms of two physical processes: (1) attenuation (shielding), by which boiling noise perturbs the moderator density between the fuel and detector locations; and (2) reactivity, by which boiling perturbs the moderator density, and thereby changes the fission rate in the fuel. In this work the fuel pins, moderator flow channels, and neutron detectors located in the bypass region were modeled explicitly in the radial direction since the attenuation effect of void fluctuations is accounted for primarily through these heterogeneities. The attenuation and reactivity effects on the detector response due to void fluctuations were separated by performing two calculations with the computer program TASK, which is a one-dimensional, frequency-dependent, transport theory kinetics code.

• Research Organization: Oak Ridge National Lab., TN (USA); Tennessee Univ., Knoxville (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6030404
• Report Number(s): CONF-800607-35; ON: TI85003572
• Country of Publication: United States
• Language: English

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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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Nonbreeding
Light-Water Moderated
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ACCURACY
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IN CORE INSTRUMENTS
KINETICS
PERFORMANCE
REACTOR INSTRUMENTATION
REACTOR KINETICS
REACTOR NOISE
REACTORS
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WATER MODERATED REACTORS