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Uchida, Shunsuke; Hata, Kuniki; Hanawa, Satoshi; Chimi, Yasuhiro
no journal, ,
no abstracts in English
Uchida, Shunsuke; Hata, Kuniki; Hanawa, Satoshi; Chimi, Yasuhiro
no journal, ,
The direct effects of hydrogen concentrations on the ECP were discussed in the previous presentation (the series #2). The parameters to determine ECP, e.g., pH and dose rate as well as hydrogen concentration, were different between in PWRs and BWRs. In the presentation, the direct and indirect effects of pH on ECP due to water radiolysis, surface properties and metallic ion solubilities are discussed. It was concluded that the corrosive conditions in the wide pH range which covered both PWR primary cooling water and BWR cooling water could be evaluated with a set of analysis codes for water radiolysis and ECP with applying the pH-dependent reaction constants.
Hata, Kuniki; Hanawa, Satoshi; Chimi, Yasuhiro; Uchida, Shunsuke
no journal, ,
no abstracts in English
Uchida, Shunsuke; Hata, Kuniki; Hanawa, Satoshi; Chimi, Yasuhiro
no journal, ,
In the previous presentations (the series No.1-4), it was confirmed that the water radiolysis and ECP models developed for BWR primary coolant conditions could be successfully applied for PWR primary coolant conditions. The coupled application of both models was applied to propose the optimal hydrogen concentration control from the viewpoint of ECP suppression. In the presentation, applicability of the models to evaluation of the boron and lithium simultaneous control was discussed and it was concluded that the optimal pH control for plant dose rate suppression and the optimal hydrogen concentration control for structural material integrity could be established at the same time.