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KMID : 0364920140390010014
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Journal of Radiation Protection and Research
2014 Volume.39 No. 1 p.14 ~ p.20
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Analysis of Source Terms at Domestic Nuclear Power Plant with CZT Semiconductor Detector
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Kang Seo Kon
Kang Hwayoon
Lee Byoung-Il
Kim Jeong-In
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Abstract
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A lot of radiation exposure for radiation workers who are engaged in Nuclear Power Plants, especially PWRs, havebeen caused during the outage by CRUD, such as 58Co, 60Co, in Reactor Coolant System. And therefore we need to knowsource terms to achieve optimization of protection for the radiation workers from radiation exposure at Nuclear Power Plantsefficiently. This study analyzed source terms at domestic NPPs (PWRs) nearby Steam Generator with CZT semiconductordetector using by IN-VIVO method during the outage for the first time in the country. We checked difference for the detectedsource terms between old and new NPP. It was performed especially to see a change of source terms by water chemistryprocess as well. There was not any difference by water chemistry process both NPPs. The main source terms are 58Co and60Co at all NPPs. 59Fe only appears in the new NPP. 137Cs and 95Zr are shown in the old NPP. The fraction of 58Co/60Co in the new NPP is higher than the old NPP for increasing the specific activity of 60Co.
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KEYWORD
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Outage, Optimization of protection, CZT, Source terms, Steam generator, Old and new NPP, PWRs
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