高速実験炉「常陽」第11回定期検査における被ばく管理報告

Report of radiation exposure control on the 11th periodic inspection at experimental fast reactor JOYO; Reported by radiation control section

高嶋 秀樹 ; 江森 修一; 荻沼 宏樹; 安藤 秀樹

not registered; not registered; not registered; Ando, Hideki

高速実験炉「常陽」では、平成7年5月10日から平成9年3月24日の期間にかけて、第11回定期検査が実施された。本定期検査は、期間延長が行なわれたため、被ばく管理については2期間に分割し実施した。その結果、前記(H7.5.10H8.12.7:約17ヶ月)における総被ばく線量当量の実績は、予想総被ばく線量当量約280人・mSvに対して243.34人・mSv、後期(H8.12.8H9.3.24:約3ヶ月)については予想総被ばく線量当量約85人・mSvに対して44.73人・mSvとなり、定期検査期間中の総被ばく線量当量は288.07人・mSvであった。これらのことを含め、今回の定期検査は適切な放射線作業計画の基に行なわれたことが確認できた。本報告書は、第11回定期検査で行った被ばく管理及び被ばく低減対策についてこれまでの定期検査の実績を基に取りまとめた。

The 11th periodic inspection had been executed at the experimental fast reactor JOYO from May 10,1995 to March 24,1997. Because the inspection had been extended several times, the time span of external exposure control was divided into two period. The result of collective dose equivalent in the previous term(from May 10,1995 to December 7,1996: about seventeen months) was 243.34 man*mSv, whereas, the expected collective dose equivalent was about 280man*mSv. The result of collective dose equivalent in the latter term (from December 8,1996 to March 24,1997: about three months) was 44.73 man*mSv, whereas, the expected collective dose equivalent was about 85man*mSv. The collective dose equivalent in the whole period of this inspection was 288.07 man*mSv. It was confirmed that this inspection was carried out with the suitable radiation protection programmes. In this report, the method for the control of external exposure and the reduction of external exposure, provided in 11th periodic inspection, were described with taking the results of the past periodic inspections into consideration.