Neutron absorber effect on coolant void reactivity in a pressure-tube-type heavy water reactor

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Nuclear Science and Engineering; (United States)

OSTI ID:5667514

Kowata, Y; Fukumura, N ^[1]

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1. Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan). Oarai Engineering Center

In this paper the effects of coolant void reactivity from soluble poison and from control rods inserted into the moderator of a light-water-cooled pressure-tube-type heavy water reactor (HWR) are studied in experiments and theoretical analyses. The soluble neutron absorber is {sup 10}B burnable poison uniformly dissolved in the moderator, and the boron carbide control rods are inserted into the moderator vertically between fuel channels. The reactivity caused by the increased void fraction is measured in the deuterium critical assembly (DCA). The void reactivity becomes less negative with the soluble neutron absorber, and the change is nearly proportional to the concentration of poison. The void reactivity is not as dependent on the number of control rods inserted, and the incremental positive shift lessens with increasing control rod worth.

• OSTI ID: 5667514
• Journal Information: Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 108:3; ISSN 0029-5639; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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22 GENERAL STUDIES OF NUCLEAR REACTORS
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COMPUTER CODES
CONTAINERS
CONTROL ELEMENTS
COOLANT LOOPS
COOLING SYSTEMS
HEAVY WATER MODERATED REACTORS
HWLWR TYPE REACTORS
KINETICS
NEUTRON ABSORBERS
PRESSURE VESSELS
REACTOR COMPONENTS
REACTOR KINETICS
REACTORS
VOID FRACTION
W CODES
WATER COOLED REACTORS