JMTRキャプセル照射温度評価法の開発; 有限要素法「NISA」コードによるCT試験片及び2分割熱媒体の温度評価

Development of evaluation method on irradiation temperature for JMTR capsule; Temperature valuation of CT specimen and separated specimen holder by NISA FEM code

冨田 健司; 細川 甚作; 松井 義典 

Tomita, Kenji; Hosokawa, Jinsaku; Matsui, Yoshinori

JMTRでは平成23年度再稼働に向けて、材料キャプセルの温度評価の高精度化を進めている。従来のサブプログラムでは矩形の試料形状により温度を評価していた。今回の開発では、特殊な形状であるCT試験片をモデル化して温度分布を解析できるようにした。また、この不均一な温度分布による熱応力分布も解析できるサブプログラムを開発した。さらに、再照射試験に有効と考えられる2分割熱媒体の構造をモデル化できるようサブプログラムの開発を行った。

In JMTR, highly precise-ization of irradiation temperature evaluation of material capsule is advanced towards re-operation in the 2011 fiscal year. In the conventional sub-program, rectangular form was loaded into the capsule and temperature evaluation was carried out. In this development, the CT specimen which is special form is loaded into capsule, and it enabled it to analyze a temperature distribution. Moreover, the sub-program which can also evaluate the heat stress distribution by this uneven temperature distribution was developed. And, in order to be able to perform easily extraction and re-load of irradiation specimens, the structure of separation specimen holder effective in a re-irradiation examination is adopted. However, with this structure, the inside of capsule serves as uneven temperature distribution. For this reason, the sub-program which can evaluate this temperature distribution was developed.