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Report No.
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Report of Radiation Exposure Control on the 13th Annual Inspection at the Experimental Fast Reactor JOYO

Kano, Yutaka; Hoshiba, Hideaki; Emori, Shuichi; Higuchi, Tsunehisa

The 13th annual inspection at the experimental fast reactor JOYO had been executed from June 1, 2000 to November 27, 2003. While this inspection,in addition to the regular maintenance and repair, some countermeasure works based on safety overhaul and works relevant to the heat transport system modification for upgrading the irradiation performance (MK-III modfication) in the under floor of reactor building were implemented. Duration of the inspection was about 3.5 years, longer than past inspections. While the inspection, the replacement of the internal heat exchanger (IHX) A, B, in primary coolant system, and relevant pipes was considered important in radiation control. The point of radiation control of this work was external exposure to workers.The expectation of exposure dose in the annual inspection and the MK-III modification were made for every work subject in consideration of procedure, number of workers, period and place of the work. The expectation of total exposure in the annual inspection, summed up the yearly expectation from 2000 to 2003, was 1156 man-mSv. While In the MK-III modification from June 1, 2000 to November 30, 2002, the expectation of total exposure was 7135 man-mSv. Furthermore, all the while in the MK-III modification, We call for work end department that workers exposure was as low as practical. As a result, total exposure was 633 man-mSv in the annual inspection, and 2386 man-mSv in the MK-III modification. Both of total result exposure was about 30-50% of the expectation, and every worker's exposure were controlled under the criteria of exposure control. Finally, the works in the 13th annuall inspection was properly executed.

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