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Reduced Enrichment for Research and Test Reactors
Nuclear Science and Engineering Division at Argonne
U.S. Department of Energy

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Abstracts and Available Papers Presented at the
2000 International RERTR Meeting


Masahiro YAGI, Shigeru WADA,

JRR-3 Operation Division, Department of Research Reactor
Japan Atomic Energy Research Institute
Tokai-mura Naka-gun Ibaraki-ken 319-1195, Japan


In JRR-3M, the core conversion works from the aluminide fuel to the silicide fuel had been conducted since September of 1999. In the core and the heavy water tank, four BF3 counters and two CICs were installed so as to measure a small amount of neutron, and antimony was installed in the beryllium reflector as the neutron source. JRR-3M achieved the first criticality using the silicide fuels on September 17th, 1999. The minimum critical core was achieved with 15 standard fuel elements. The minimum critical mass was measured to 8.467 kg 235U. This result of measurement agreed approximately with the result of calculation with the MVP code. After that, JRR-3M constituted the full core. As the result, the excess reactivity in JRR-3M core was measured to 14.1 %Dk/k. Beside, the neutron flux, the control rod reactivity worth, the heavy water dump effecting, the moderator temperature effecting and so on had been measured as the characteristic test with the core conversion. Several reactor physics parameters had been obtained by these tests.

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Mr. Masahiro Yagi
Japan Atomic Energy Research Institute
Tokai-mura, Naka-gun Ibaraki-ken
319-1195, Japan 

Phone:  +81-29-282-5755
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E-mail:  [email protected]

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Last modified on July 29, 2008 11:33 +0200