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Report No.
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ECP evaluation by water radiolysis and ECP model calculations

Hanawa, Satoshi ; Nakamura, Takehiko ; Uchida, Shunsuke; Kus, P.*; Vsolak, R.*; Kysela, J.*

In-pile ECP measurements data was evaluated by water radiolysis calculations. The data was obtained by using in-pile loop in an experimental reactor, LVR-15, at the Nuclear Research Institute (NRI) in Czech Republic. Three types of ECP sensors, a Pt electrode, an Ag/AgCl sensor and a zirconia membrane sensor containing Ag/Ag$$_{2}$$O were used at several levels of the irradiation rig at various neutron flux and $$gamma$$ rates. Concentration of chemical species along the water flow was calculated by a radiolysis code, WRAC-J. The radiolysis calculation results were transferred to an ECP model. In the model, anodic and cathodic current densities were calculated with combination of an electrochemistry model and an oxide film growth model. The measured ECP data were compared with the radiolysis/ECP calculation results, and applicability of radiolysis model was confirmed.

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