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Vol.12 No.1previousAA SP23 (AA172-173)-AA174 NT97

Academic Articles
Regular Paper Vol.12 No.1 (2020) p.14 - p.25

The effect of Dissolved Hydrogen for PWSCC Initiation test by Reverse U-Bend specimen of Alloy 600


Takaaki Kobayashi1 and Wataru Sugino2

1 Mitsubishi Heavy Industries, LTD, 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-city, Japan
1The Japan Atomic Power Campany, 5-2-1, Ueno, Taitou-ku, Tokyo, Japan

In order to apply a more positive countermeasure against Primary Water Stress Corrosion Cracking (PWSCC) of Alloy 600, an optimizing Dissolved Hydrogen (DH) concentration in primary water are expected in addition to a replacing to Alloy 690 or a stress improvement by water jet peening. PWSCC initiation test data depending on DH concentration are few. PWSCC initiation tests by Reverse U-Bend (RUB) specimens with the different pre-strain setting had been performed. PWSCC initiation test by 25% pre-strained RUB specimen also showed the same dependency on DH concentration as PWSCC crack growth test by CT specimen in also this study at 345°C as same as the previous study at 320°C by the authors. It’s considered due to the high stress applied to the material surface and the crevasse of oxide film on 25% pre-strained RUB specimen. On the other hand, the test by 10% pre-strained RUB specimen showed the different dependency on DH from the test by 25% pre-strained RUB specimen. It’s considered that the test by lower pre-strained RUB shows the result based on the protectable Cr enriched oxide film. The cold working rate to Alloy600 parts in the actual PWR is basically less than 10%. In order to correctly evaluate the susceptibility of PWSCC initiation depending on DH concentration for the actual PWR, it’s necessary to be performed PWSCC initiation test by a specimen applied a lower pre-strain or stress even if it need a long-term SCC test.
Dissolved Hydrogen, Stress Corrosion Cracking, Nickel based alloy, Alloy 600, Nickel Oxide, PWSCC, Crack Initiation time, Crack Propagation Rate
Full Paper: PDF
Article Information
Article history:
Received 21 December 2019
Accepted 16 May 2020