Abstract
ABSTRACT The D/W pressure at Fukushima Daiichi Nuclear Power Plant Unit-2 dropped from 0.73 MPa [abs] to 0.155 MPa [abs] between 7:20 and 11:20 on the March15th, 2011. We assumed gas leakage from the PCV and steam condensation in the PCV as factors of this depressurization, and examined the feasibility of the accident progression scenario based on the observation facts obtained from the site. In case assuming that the PCV was depressurized only by the gas leak, it is necessary to think that there was alarge-scale leak including those other than the top head flange. However, it is difficult to explain the consistency with the observation facts obtained after the accident, such as relatively high airtightness of the PCV of Unit-2, and relatively low dose rate in the reactor building other than the operation floor. On the other hand, in case assuming that the PCV was depressurized by the condensation in addition to relatively small scale gas leak, it becomes easy to explain the consistency with the observation facts.
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