Analysis of a neutron flux oscillation event at LaSalle-2

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Nuclear Technology; (United States)

OSTI ID:5081087

Araya, F; Yoshida, K; Hirano, M ^[1]; Yabushita, Y ^[2]

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1. Japan Atomic Energy Research Inst., Dept. of Reactor Safety Research, Tokai-mura, Naka-gun, Ibaraki-ken 319-11 (JP)
2. IEA of Japan, Sumitomo Higashi-Shimbashi Bldg. No. 4, 9-6 Shimbashi 6-chome, Minato-ku, Tokyo 105 (JP)

On March 9, 1988, the LaSalle-2 nuclear power plant experienced a neutron flux oscillation under natural circulation. To obtain an in-depth understanding of this event, a series of analytical studies has been performed using the RETRAN code within the scope of a point kinetics model. In previous studies, an instability map was drawn on the plane of the nondimensional power-to-flow ratio and core inlet subcooling, which was essentially the same as that proposed by Ishii and Zuber. The event sequence was simulated by RETRAN, and the locus of the event was drawn on the instability map. This paper describes the experimental calculations that were performed to validate the method used to determine the instability threshold used in the previous studies, the calculations of the improved instability map and event simulation.

• OSTI ID: 5081087
• Journal Information: Nuclear Technology; (United States), Journal Name: Nuclear Technology; (United States) Vol. 93:1; ISSN NUTYB; ISSN 0029-5450
• Country of Publication: United States
• Language: English

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