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材料試験炉,運転と技術開発 No.17; 2002年度

Annual report of JMTR, No.17, FY2002; April 1, 2002 - March 31, 2003

材料試験炉部

Department of JMTR

2002年度(平成14年度)は、第145サイクルから第147サイクルのJMTR(材料試験炉)共同利用運転を行い、軽水炉炉内構造物の照射誘起応力腐食割れ(IASCC)の研究,核融合炉ブランケットの開発研究,材料基礎研究,放射性同位元素(RI)の製造・開発等を目的とした照射試験を実施した。制御棒駆動機構の誤信号発生,一次冷却水漏れにより2度の計画外停止があり、それぞれ復旧及び再発防止のための点検,運転手引や関連設備の改良等を行った。また、炉内構造物であるベリリウム枠の更新等を実施した。JMTRの照射利用に関する技術開発に関しては、中性子及び$$gamma$$線による加熱率の評価方法に関する検討,IASCC照射試験に関する照射温度評価・制御技術の開発を行うとともに、照射後IASCC試験技術の開発を進め、照射下-照射後試験の比較ができる見通しを得た。核融合炉ブランケットに関する研究では、トリチウム増殖材微小球製造のための新規な湿式製造法基本プロセスの確立,部分モジュールインパイル機能試験のための技術開発等を行った。以上のほか、日韓研究協力協定のもとに、照射技術及び照射後試験技術についてそれぞれ韓国原子力研究所(KAERI)と共同セミナーを開催した。本報告書は、これら2002年度のJMTR運転,関連する技術開発等についてまとめたものである。

During the FY2002 (April 2002 to March 2003), the Japan Materials Testing Reactor (JMTR) was operated in three operation cycles for studies on the irradiation-assisted stress corrosion cracking (IASCC) of internal structures of light water reactors, development of the fusion blanket, basic materials research, radioisotope production, and so on. The reactor was twice subjected to unscheduled shutdowns, once due to an error signal of the control-rod drive mechanism and afterwards due to leakage of primary coolant. Recovery and corrective actions were taken properly, such as improvements in related facilities and revision of operation manuals. Besides, the beryllium reflector frames were replaced, which are internal structures of the JMTR. Concerning development on techniques for irradiation utilization, noticeable progress was made in an evaluation method of neutron and $$gamma$$-ray heating rates of materials in JMTR irradiation, in development and installation of a monitoring and control system of specimen temperatures for IASCC irradiation examinations, and in successful performance tests by a post-irradiation crack-growth testing device, which brought a prospect of comparative studies between in-situ and post-irradiation examinations. In studies on the fusion blanket, a basic process was established for production of tritium breeder pebbles, and irradiation techniques were developed for in-pile functional tests of a simulated blanket module. In addition, joint seminars were held with the Korea Atomic Energy Research Institute (KAERI) on techniques for irradiation and post-irradiation examinations. The present report summarizes the JMTR operation and related technical development in the Department of JMTR during the FY2002.

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