Development of fuel failure detection system for a high temperature gas cooled reactor (III)

Conference · Wed Feb 01 04:00:00 EST 1989 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6375968

Terada, H; Asami, S; Kishimoto, M; Wakayama, N; Obata, M; Ogawa, T; Kobayashi, F; Fukuda, K; Abe, H; Yokouti,

A precision type precipitator has been developed for high sensitivity detection of fuel failure in a high temperature gas cooled reactor. The fuel failure detection (FFD) method is based on selective detection of short-life fission products to eliminate the background effect caused by long-life fission products in the primary circuit. Although this precipitator has a limited length of wire in the body equal to that of the conventional type, it can control the movement of the wire precisely, preventing the collection of fission products on the same part of the wire in each round. Unlike the conventional type, the precision precipitator can enormously reduce the background counts of the precipitation wire. This progress is very effective for selective detection of short-life fission products in the primary coolant helium gas. A performance of the FFD system using the precipitator has been tested in an in-pile irradiation rig. In the experiment, it was guaranteed that the precipitator could decrease the contribution of the background counts from 10% to below 0.4%. Therefore, an extremely slight change in the amount of fission products released from coated particles can be detected by the FFD system in a failure rate of 10/sup -5/.

• Research Organization: Japan Atomic Energy Research Institute (JAERI), Tohkai-mura, Naka-gun, Ibaraki-ken 319-11 (JP)
• OSTI ID: 6375968
• Report Number(s): CONF-881103-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: 36:1
• Country of Publication: United States
• Language: English

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ACCIDENTS
COOLING SYSTEMS
ELEMENTS
ENERGY SYSTEMS
FAILURES
FISSION PRODUCTS
FLUIDS
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GRAPHITE MODERATED REACTORS
HELIUM
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RADIOACTIVE MATERIALS
RARE GASES
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR MONITORING SYSTEMS
REACTOR SAFETY
REACTORS
SAFETY
SURVEILLANCE