次世代炉定数の整備(II)

Preparation of next generation set of group cross sections (II)

金子 邦男*

not registered

本年度は、昨年度実施した「次世代炉定数の整備」研究で整備したPRENJOYNJOY97POSTNJOYPDSMAKEコードからなる基本的な汎用炉定数作成システムにJFS3ライブラリー作成で使用されている重核の共鳴処理コードTIMS-1の導入・整備を行い、汎用炉定数作成システムを完成させた。そして、このTIMS-1コードの導入により、当該汎用炉定数作成システムで、新SLAROMコードのPEACOモジュールが使用する詳細群共鳴断面積ライブラリーMCROSS作成に必要な非分離共鳴エネルギー領域のポイント断面積作成が可能となった。また、TIMS-1の導入・整備ではUNIXマシーンへのコード移植を行うと共に入力データの簡素化や核データ処理機能の高度化を行い、比較的簡単な入力で重核の共鳴処理が可能となるようにTIMS-1コードの改良を実施した。更には、次世代炉定数の基本性能を十分に発揮させ、核特性解析精度を向上させると共に核特性解析以外のより広い分野でも次世代炉定数が利用されるように、当該炉定数の詳細仕様の検討を実施した。即ち、昨年度の研究でのZPPR-13A炉心の反応率分布解析で得られた知見により、将来の汎用炉定数ライブラリーの群数とエネルギー構造を定める検討を実施し、汎用炉定数ライブラリーの具体的なエネルギー群構造を提案した。そして、炉心特性解析分野だけでなく、炉心安全解析、核設計等の幅広い分野にわたる応用を想定して、次世代炉定数のデータ構成およびデータ内容を具体的に検討した。

In FY2000, the general reactor group constant production system has been completed as below: TIMS-1; the code for preparing heavy element's resonance crosssection that is utilized in the JFS3 library production, was introduced and connected with the basic general reactor group constant production system which has been prepared last year, while consisting of a serial code PRENJOY, NJOY97, POSDTNJOY, and PDSMAKE and resulting whole system was adjusted so as to be utilized as the constant production system. With this introduction of TIMS-1 and the usage of the relevant general reactor group constant system, it becomes possible to produce a point-wise cross section of unresolved resonance energy region, which is necessary to the ultra fine group cross sections library for the PEACO module of new SLAROM code. On the other hand, while conversion of TIMS-1 to a UNIX machine program, TIMS-1 has been improved so as to make possible heavy nuclide resonance cross section processing with considerably simple input operation, with simplification of data input, and improvement of the method of evaluated nuclear data processing. In addition, we discussed the basic concept of next generation group constant set which should exhibit fully the high capability of the group constant and increase core performance analysis and be utilized in fields other than core analysis. Along with the knowledge obtained by ZPPR-13A core reaction rate analysis perfomed in the last year, the investigation of number of groups and group structure and proposition of a concrete group structure was done. Further supposing wider applications of the next generation group constant such as core safety analysis, core design and so on, other than core parameter analysis, the data structure and the concrete content of next generation group constant set were discussed