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Standardization on evaluating instrumentation drift of safety protection system as an industrial guideline in Japan TANAKA Takashi1, UEYAMA Ippei2, TAMURA Yoshiaki3, and
NAGASHIMA Kazufumi4
1. Tokyo Electric Power Company, 1-1-3, Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-8560, Japan (tanaka.taka@tepco.co.jp)
2. The Kansai Electric Power Company, 13-8, Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
(ueyama.ippei@b4.kepco.co.jp)
3. Japan Electric Association, 1-7-1, Yuraku-cho, Chiyoda-ku, Tokyo 100-0006, Japan (y-tamura@denki.or.jp)
4. The Kansai Electric Power Company, 13-8, Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
(nagashima.kazufumi@b2.kepco.co.jp)
Abstract: The instrumentation drift is particularly important for the safety design of reactor protection system because the instrumentation drift will grow with the .continuation of plant operation. The subject of this paper is how to evaluate the growth of instrumentation drift with the extension of reactor operation period more than the traditional practice of one year operation in Japan. In this paper, condensed review is first made on the process of establishing an industrial guideline of evaluating instrumentation drift of safety protection system. The analysis procedure to evaluate instrumentation drift from the calibration data and how to evaluate the effect of instrumentation drift on the set point of the safety instrumentation are also presented in this paper.
Keywords: safety protection systems; instrumentation drift; industrial standard |
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