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Planning of occupational dose reduction at BWR power plant by past dose record analysis combined with on-site
Tomohiro Konno1, Junichi Taira, Toshiyuki Hayashida
1Hitachi-GE Nuclear Energy, Ltd, 3-1-1 Saiwai-cho, Hitachi-shi, Ibaraki 317-0073, Japan. tomohiro.konno.kj@hitachi.com
Abstract:
In order to establish a plan for occupational dose reduction at operating plants, outage inspection works that involve high-dose exposure were selected and a determination of the major causes of high-dose exposure made by plant-by-plant comparison of doses received during inspection works. The comparison was made to investigate the relationship between exposure and the volume of objects to be inspected, working time and man-hour of each work process and ambient dose rates at work areas. In parallel with this, an analysis has also been carried out on 400 data items in a questionnaire survey conducted on relevant individuals, including foremen, radiation safety personnel, on-site workers and plant designers regarding ideas for dose reduction methods. With combination of these two analyses, matters that require improvement will be highlighted, then modification of equipment or revision of work procedures necessary for occupational dose reduction will be planned by plant designers through review.
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