JAERI 1287 JNDC Nuclear Data Library of Fission Products Fir
JAERI 1287 JNDC Nuclear Data Library of Fission Products Fir
JAERI 1287 JNDC Nuclear Data Library of Fission Products Fir
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<strong>JAERI</strong> <strong>1287</strong><br />
<strong>JNDC</strong> <strong>Nuclear</strong> <strong>Data</strong> <strong>Library</strong> <strong>of</strong> <strong>Fission</strong> <strong>Products</strong><br />
Kanji Tasaka, Hitoshi Ihara, Masatsugu Akiyama'<br />
Tadashi Yoshida *, Zyun-itiro Matumoto and Ryuzo Nakasima<br />
Japanese <strong>Nuclear</strong> <strong>Data</strong> Committee<br />
Tokai Research Establishment<br />
Japan Atomic Energy Research Institute<br />
Tokai-mura, Naka-gun, Ibaraki-ken<br />
Received June 3, 1983<br />
Abstract<br />
The <strong>JNDC</strong> (Japanese <strong>Nuclear</strong> <strong>Data</strong> Committee) FP (<strong>Fission</strong> Product) nuclear data library<br />
for 1172 fission products is described in this report. The gross theory <strong>of</strong> beta decay has been<br />
used extensively for estimating unknown decay data and also some <strong>of</strong> known decay data with<br />
poor accuracy. The calculated decay powers <strong>of</strong> fission products using the present library show<br />
excellent agreement with the latest measurements at ORNL (Oak Ridge National Laboratory),<br />
LANL (Los Alamos National Laboratory) and UTT (University <strong>of</strong> Tokyo, Tokai) for cooling<br />
times shorter than 10 3 s after irradiation. The calculated decay powers by the existing libraries<br />
showed systematic deviations at short cooling times; the calculated beta and gamma decay<br />
powers after burst fission were smaller than the experimental results for cooling times shorter<br />
than 10 s, and in the cooling time range 10 to 10 3 s the beta-decay power was larger than the<br />
measured values and the gamma decay power smaller than the measured results. The present<br />
<strong>JNDC</strong> FP nuclear data library resolved these discrepancies in the short cooling time ranges.<br />
The decay power <strong>of</strong> fission products has been calculated for ten fission types and the results<br />
have been fitted by an analytical function with 31 exponentials. This permits the easy application<br />
<strong>of</strong> the present results <strong>of</strong> decay power calculations to a LOCA (Loss-<strong>of</strong>-Coolant Accident)<br />
analysis <strong>of</strong> a light water reactor and so on.<br />
Keywords: <strong>Fission</strong> Product, Decay <strong>Data</strong>, <strong>Fission</strong> Yield <strong>Data</strong>, Neutron Capture Cross Section<br />
<strong>Data</strong>, Gross Theory, <strong>Data</strong> <strong>Library</strong>, <strong>Fission</strong> Energy, Decay Heat, Evaluation,<br />
Fitting Equation<br />
The work was performed in the evaluation work <strong>of</strong> the Working Group on Evaluation <strong>of</strong> Decay Heat,<br />
Japanese <strong>Nuclear</strong> <strong>Data</strong> Committee.<br />
* <strong>Nuclear</strong> Engineering Research Laboratory, Faculty <strong>of</strong> Engineering, University <strong>of</strong> Tokyo<br />
** NAIG <strong>Nuclear</strong> Research Laboratory, Nippon Atomic Industry Group Co., Ltd.<br />
*** Department <strong>of</strong> Physics, Hosei University