Investigation concerning influence of cosmic rays on criticality accident alarm system; Relationship between "Single Detection" and cosmic rays

Izaki, Kenji ; Suzuki, Hideki; Tsubaki, Hirohiko; Ozeki, Kiyoshi

Criticality Accident Alarm System (CAAS) has been used in Nuclear Fuel Cycle Engineering Laboratories for about 20 years, and there is occurrence of the abnormal signal called "Single Detection", as an operational problem of CAAS. Radiation Protection Division has investigated the causes affecting "Single Detection", as well as reducing the influence of noises such as electromagnetic waves and power source variations. This report shows the result of the long-term observation with detectors of CAAS and describes that cosmic rays have high possibility to cause "Single Detection".

Language	:	Japanese
Report No.	:	JAEA-Research 2007-009
Pages	:	40 Pages
Publication Year/Month	:	2007/03
Patent information	:
PDF	:	JAEA-Research-2007-009.pdf:4.17MB
Paper URL	:	https://doi.org/10.11484/jaea-research-2007-009
Keywords	:	no keyword
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Article of JAEA R&D Review	:
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Registration No. : RS20070009
JAEA Abstracts No. : 35000423

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