Transient behaviour of 4.8g/cc silicide fuel, 1; Abnormal withdrawal of control rod during a start-up of JMTR

Yanagisawa, Kazuaki

The Japan Materials Testing Reactor (JMTR) loaded the 4.8g/cc silicide fuel for the core conversion from the high to the low enrichment ( 20wt%). In the experiment, the reactivity insertion of 0.35% per s, caused by the by the abnormal withdrawal of the control rod at the start up of the JMTR was assumed. The value was about twice the EUREKA2 computer code used for the licensing. As a result, the test specimen (4.8g/cc silicide fuel) had the peak cladding surface temperature of 137 $^{circ}$ C. The test specimen did not fail by quench mechanism because the time to quench tq was 0.11s and the temperature drop was 28 $^{circ}$ C. Usually the quench failure occurs at the rapid tq ( 0.13s) and the high temperature drop ( 94 $^{circ}$ C). The safety margin of the JMTR against the accident induced by the abnormal withdrawal of control rod was assured.

Language	:	English
Journal	:	International Journal of Nuclear Energy Science and Technology
Volume	:	6
Number	:	1
Pages	:	p.55 - 63
Publication Year/Month	:	2011/00
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Paper URL	:	https://doi.org/10.1504/IJNEST.2011.039248
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Keywords	:	no keyword
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Registration No. : AA20100227
JAEA Abstracts No. : 39000607
Paper Submission No. : 8822

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