A Mechanism for Corrosion Product Deposition on the Carbon Steel Piping in the Residual Heat Removal System of BWRs

The dose rate of the residual heat removal (RHR) piping has been considered to be caused by accumulation of insoluble (crud) radioactive corrosion products on carbon steel surfaces. Soft shutdown procedures (i.e., plant shutdown with moderate coolant temperature reduction rate) used to be applied to...

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Bibliographic Details
Published in:Journal of nuclear science and technology 2002-10, Vol.39 (10), p.1041-1050
Main Authors: AIZAWA, Motohiro, CHIBA, Yoshinori, HOSOKAWA, Hideyuki, OHSUMI, Katsumi, UCHIDA, Shunsuke, ISHIZAWA, Noboru
Format: Article
Language:English
Subjects:
Applied sciences
BWR type reactors
carbon steels
cobalt 60
corrosion products
dehydration
dose rates
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Installations for energy generation and conversion: thermal and electrical energy
nuclear power plants
occupational exposure
radioactivity
residual heat removal
RHR piping
spinel compounds
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Summary:The dose rate of the residual heat removal (RHR) piping has been considered to be caused by accumulation of insoluble (crud) radioactive corrosion products on carbon steel surfaces. Soft shutdown procedures (i.e., plant shutdown with moderate coolant temperature reduction rate) used to be applied to reduce crud radioactivity release from the fuel surface, but these are no longer used because of the need for shorter plant shutdown times. In order to apply other suitable countermeasures to reduce RHR dose rate, assessment of plant data, experiments on deposition of crud and ion species on carbon steel, and mass balance evaluation of radioactive corrosion products based on plant and laboratory data were carried out and the following findings were made.
ISSN:0022-3131
1881-1248
DOI:10.1080/18811248.2002.9715292