THE FlRST ATOMlC POWER INDUSTRY GROUP
Cover Design : Ikuo Shimizu
Atsushi Minagoshi, Takeshi Miyairi, Tsuyoshi Sakamaki, Takeshi Ishikura
Three types of radiation instruments which employ newly developed semiconductor detectors are introduced in this article. For the measurement range of patrol survey meters, the stable directional characteristics of dose equivalent rate ranging from 0.1ΚΚSv/h to 130mSv/h have been also achieved. Portable area monitor has been designed for appropriate use at a site with the 1.3 times more sensitive detection of our existing fixed type area monitor. Also, the detection probe can measure by placing even 30m away from the surface to be monitored. Environmental dosimeter has been also improved 11 times better detection sensitivity of our existing product and two AA lithium batteries can operate the instrument for a year.
KEYWORDSFsurvey meter, patrol survey meter, existing fixed type area monitor, environmental dosimeter, silicon semiconductor sensor, multi channel semiconductor type detector
Satsuki Takenaka, Terumasa Sawada, Seiichiro Yamazaki, Hideaki Kimura
Tokai Power Station (TPS) of THE JAPAN ATOMIC POWER COMPANY (JAPC)
started the commercial operation in 1966. JAPC is now dismantling by
themselves after the commercial operation stop in 1998. Kawasaki Plant
Systems, LTD (K Plant) took part in the construction of TPS and manufactured
and maintained its primary system including the heat exchangers (SRU).
And K-Plant had investigated the decommissioning methods with JAPC.
KEYWORDSFjack-down, dry wire saw, remote controlled gripp, remote controlled transfer, floor surface accuracy