MSSRVs in Boiling Water Reactor (BWRs) can be mandatory opened through a solenoid valve, when a nuclear reactor raises unusual pressure. The solenoid valve consists of a valve main part which forms a flow channel, and a pilot part which controls a flow direction.

In the accident of the Fukushima Daiichi nuclear power plant, MSSRVs ware over the design specification of these solenoid valves, and were not able to operate. One of the reason, there is degradation of a sealant and a coil of a solenoid valve.

As one of the measures for rebooting the BWRs, the development and verification of a solenoid valve which were applied to the SA condition are required. Since we developed and verified it applied to the SA.condition, we report here.

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