JASPER Experimental analyses(lX)

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This report describes the results of the JASPER (Japanese-American Shielding Program for Experimental Research) post experiment analysis conducted in JFY 1994. Reviewed items were chosen by considering the past discussions. Series of the JASPER experimental analyses ('86 '94) have been terminated and the review report is being published. Major conclusions of this report are briefly as follows. (Axial Shield Experiment) Monte Carlo code "MORSE" was employed in the analysis of Homogeneous, Rod-bundle and Central blockage configuration, respectively. C/E values of streaming factor are relatively good(0.950.98) for Bonner ball response, while around 20% underestimation is found in Hornyak button response. Good agreement is not always found between MORSE and two-dimensional discrete ordinates code DOT-3.5. (IN-Vessel Fuel Storage Experiment) U.S.-proposed configurations have been reviewed to finish all experimental analyses. These configurations have 1.8m-thick Na layer prior to the IVS mockup, which may soften neutron spectrum. They show almost same C/E values (0.801.01) as the Japan-proposed ones. Analysis accuracy on the IVS mockup is found to be -10+20%. (Intermediate Heat Exchanger Experiment) Three-dimensional discrete ordinates code "TORT" was employed in the analysis of a configuration which shows a complicated neutron flux distribution due to the BC Shield Prior to the sodium region. Various parameters including those for mesh spacing techniques were optimized. There exists around 15% discrepancy between TORT and MORSE, however, it is attributed to the different ways in obtaining input neutron flux.(Gap Streaming Experiment) Basic calculations were conducted in order to investigate a standard for selecting appropriate Sn quardratures sets. In analyzing configuration where neutron streaming is evident, biased setting toward a streaming direction would be useful to evaluate more exact flux distribution. ...