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An Application program for fission product decay heat calculations

核分裂生成物による崩壊熱計算のためのプログラム

Pham, N. S.*; 片倉 純一

Pham, N. S.*; Katakura, Junichi

崩壊熱を正確に知ることは原子力施設の安全設計や運転における最も重要な因子の一つである。さらに、崩壊熱は燃料排出や貯蔵,輸送,管理,処理においても、重要な役割を果たす。この研究では正確な崩壊熱総和計算や不確実さ解析,個々の核分裂生成物の崩壊熱への寄与を得るためにDHP(Decay Heat Power program)という新しいプログラムを開発した。簡略化や近似を排除した解析法を適用し、線形及び非線形の崩壊連鎖と基底状態及び異性体を含む12の崩壊モードを自動的に同定するとともにENDF/B-VIフォーマットの崩壊データや収率データを用いることにより処理される。プログラムは、利用者が使いやすいようなオプションを備えたwindowインターフェースを用いている。

The precise knowledge of decay heat is one of the most important factors in safety design and operation of nuclear power facilities. Furthermore, decay heat data also play an important role in design of fuel discharges, fuel storage and transport flasks, and in spent fuel management and processing. In this study, a new application program, called DHP (Decay Heat Power program), has been developed for exact decay heat summation calculations, uncertainty analysis, and for determination of the individual contribution of each fission product. The analytical methods were applied in the program without any simplification or approximation, in which all of linear and non-linear decay chains, and 12 decay modes, including ground state and meta-stable states, are automatically identified, and processed by using a decay data library and a fission yield data file, both in ENDF/B-VI format. The window interface of the program is designed with optional properties which is very easy for users to run the code.

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