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概要

In Japan, from the heat resistance and the steam resistance and the radiation resistance when the severe accident occurs, the sealing material of the containment vessel is instead to the silicone rubber, have come to adopt the EPDM rubber called “improved EPDM rubber“. However, the compression set test to be evaluated for sealing properties, rubber gaskets changing the timing of radiation that its behavior is changed has been suggested. Therefore, for the “improved EPDM rubbers (EP-176)“, we performed a compression set test with different timing of the irradiation, and to clarify the behavior. Further, the sealing material of the containment vessel, it is necessary to also maintain the sealing properties after the severe accident has ceased. For the “improvement EPDM rubber (EP-176)“, we do the compression set test you change the heating conditions after a severe accident considerable amount of time, made it clear also that behavior.

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