Insulation Performance of Safety-related Cables for Nuclear Power Plants under Simulated Severe Accident Conditions
皆川 武史 Takefumi MINAKAWA 池田 雅昭 Masaaki IKEDA 平井 直志 Naoshi HIRAI 大木 義路 Yoshimichi OHKI
electrical resistivity ethylene propylene diene rubber nuclear power plant severe accident silicone rubber
To examine electrical insulation behavior of cables under severe accident environments, safety-related low voltage cables used as “severe accident management equipment” were subjected to the test at 155 oC, which simulated highest assumed temperature when proper accident management measures are taken. In addition, insulation resistance was measured for the cables during steam exposure in the test. As a result, all the cables passed the acceptance criteria of voltage withstand test prescribed in the JNES Guide. The minimum resistivity of the cables during the test at 155 oC was around 108 Ωm, confirming that the cables have a sufficient insulation performance.