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http://dx.doi.org/10.14773/cst.2021.20.5.308

He Generation Evaluation on Electrodeposited Ni After Neutron Exposure  

Hwang, Seong Sik (Korea Atomic Energy research Institute, Materials Safety Technology Development Division)
Kwon, Junhyun (Korea Atomic Energy research Institute, Materials Safety Technology Development Division)
Kim, Dong Jin (Korea Atomic Energy research Institute, Materials Safety Technology Development Division)
Kim, Sung Woo (Korea Atomic Energy research Institute, Materials Safety Technology Development Division)
Publication Information
Corrosion Science and Technology / v.20, no.5, 2021 , pp. 308-314 More about this Journal
Abstract
Neutron dose level at bottom head of a reactor pressure vessel (RPV) was calculated using reactor vessel neutron transport for a Korean nuclear power plant A. At 34 EFPY with a 40-year (2042) design life after plating repair, irradiation fast neutron effect was 6.6x1015 n/cm2. As helium(He) gas can be generated by Ni only at 1/106 level of 5 × 1021 n/cm2, He generation possibility in the Ni plating layer is very little during 40 years of operation (2042, 34 EFPY). Thermal neutrons can significantly affect the generation of He from Ni metal. At 10 years after a repair, He can be generated at a level of about 0.06 appm, a level that can add general welding repair without any consideration. After 40 years of repair, 9.8 appm of He may be generated. Although this is a rather high value, it is within the range of 0.1 to 10 appm when welding repair can be applied. Clad repair by Ni electroplating technology is expected to greatly improve the operation efficiency by improving the safety and shortening the maintenance period of the nuclear power plant.
Keywords
Nuclear power plant; Corrosion of RPV steel; Ni plating; Neutron effect; He generation;
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