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Report No.
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Systemization of burnup sensitivity analysis code (II)

Tatsumi, Masahiro*; Hyodo, Hideaki*

A distinct improvement on accuracy in nuclear core design has been accomplished by development of adjusted nuclear library using the cross-section adjustment method, in which the results of critical experiments of JUPITER and so on are reflected. In the design of large LMFBR core, however, it is important to accurately estimate not only neutronics characteristics but also burnup characteristics. For this purpose, it is desired to improve prediction accuracy of burnup characteristics using the data widely obtained in actual core.The analysis of burnup characteristics is needed to effectively use burnup characteristics data in the actual cores based on the cross-section adjustment method. So far, development of an analysis code for burnup sensitivity, SAGEP-BURN, has been done and confirmed its effectiveness. However, there is a problem that analysis sequences become inefficient because of a big burden to user due to complexity of the theory of burnup sensitivity and limitation of the system. It is also desired to rearrange the system for future revision since it is becoming difficult to implement new functionalities in the existing large system It is not sufficient to unify each computational component for some reasons; computational sequence may be changed for each item being analyzed or for purpose such as interpretation of physical meaning. Therefore it is needed to systemize the current code for burnup sensitivity analysis with component blocks of functionality that can be divided or constructed on occasion. For this purpose, systemization of the burnup sensitivity analysis code has been done with an object-oriented scripting language.In this study, an examination was conducted for the two-layer controlling model of the conventional system using Python, the object-oriented scripting language, With the result of the examination, a new analysis system for burnup sensitivity, PSAGEP (Python-wrapped SAGEP-burn), was implemented.

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