Computational breakdown of the high conversion light water reactor infinite lattice void reactivity into contributing nuclides and energy groups

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Nuclear Science and Engineering; (USA)

OSTI ID:5176708

Okumura, K; Nishina, K ^[1]

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1. Nagoya Univ., Dept. of Nuclear Engineering, Chikusaku, Nagoya 464-01 (JP)

By cell calculation with the SRAC code system, void reactivity is evaluated for a high conversion light water reactor tight lattice, with an emphasis on the breakdown of the void effect into component nuclides, nuclear reactions, and energy groups. The analysis is restricted to infinite lattices and deals with the consequence of neutron energy spectrum shifts caused by void. In a preliminary parameter survey over various fissile plutonium enrichments, a 7.5% enrichment is found approximtely to border the negative and the positive coefficients, when the moderator channel volume to fuel volume V/sub m//V/sub f/ is fixed at a typical value of 0.53. With this combination of the enrichment of V/sub m//V/sub f/ values fixed, the reactivity effect for an incremental void increase is analyzed in detail at low-void conditions (0 to 10%) and at high-void conditions (95 to 100%).

• OSTI ID: 5176708
• Journal Information: Nuclear Science and Engineering; (USA), Journal Name: Nuclear Science and Engineering; (USA) Vol. 102:4; ISSN 0029-5639; ISSN NSENA
• Country of Publication: United States
• Language: English

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