
Validation of (241)Am Capture Cross Section through Integral Test Using Criticality Data of Lightwater Moderated MOX CoresValidation of (241)Am Capture Cross Section through Integral Test Using Criticality Data of Lightwater Moderated MOX Cores 
"/Nakajima, Ken/"Nakajima, Ken ,
"/Sano, Tadafumi/"Sano, Tadafumi ,
"/Yamamoto, Toshihiro/"Yamamoto, Toshihiro
71pp.237

243 , 201505 , Elsevier Ltd
ISSN:18766102
内容記述
The Fourth International Symposium on Innovative Nuclear Energy Systems, INES4
In the development of JENDL4.0, the thermal and resonance capture cross section of 241Am was increased by about 89% to reduce the overestimation of criticality observed in the MOXFueled lightwatermoderated cores using 241Amrich plutoniumfuel.The revised data gives the better results of criticality prediction for those cores than that with JENDL3.3. The Pu ageing problem was also investigated using the revised data. This problem is that the calculated keffs for critical MOX cores with different experiment dates showed the tendency of increase with time. The change of keff in seven years was about 0.2%dk/k with JENDL3.3 and it was reduced to about 0.1%dk/k with JENDL4.0. These results show that the revision of 241Am capture cross section seemed to be successful, although there still remains the tendency of keff increase with time. On the other hand, the recent measurement of thermal and resonance capture cross section of 241Am indicates that the data of JENDL3.3 should be increased by about 18%, that is about 8% greater than that of JENDL4.0. In the present study, the possibility of further revision of 241Am capture cross section was studied through the integral test for Pu ageing problem by reflecting the recent experimental data. Three criticality data of a lightwater moderated MOX core with different experiment date (7 years interval at maximum) have been analyzed with JENDL3.3 and 4.0 libraries. In addition, the calculations with the number density of 241Am multiplied by 1.18 for JENDL3.3 and by 1.08 for JENDL4.0 were also conducted to simulate the increase of 241Am capture cross section suggested by the recent measurement. The results show that the increase tendency of keff as a function of time observed in the calculations with JENDL4.0 is not found in those with modified 241Am number density. This means that the improvement of 241Am capture cross section will be achieved by employing the recent experimental data.
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