日本最大核电站机组，重启前又出故障

Core Viewpoint - The control rod extraction test at Japan's largest nuclear power plant, Kashiwazaki-Kariwa Unit 6, experienced a malfunction in its anti-extraction function, potentially delaying the unit's restart [1][2]. Group 1: Incident Details - The Tokyo Electric Power Company (TEPCO) conducted a control rod extraction test on Unit 6, which is a prerequisite for the reactor's restart [1]. - During the test, the anti-extraction alarm did not activate as expected when a control rod was extracted, leading to the suspension of the test [2]. - TEPCO announced that it will investigate the cause of this malfunction [2]. Group 2: Operational Context - Control rods, made from materials that absorb neutrons, are crucial for regulating nuclear fission reactions within the reactor core [2]. - The Kashiwazaki-Kariwa nuclear power plant has been offline since the March 11, 2011, earthquake, and local consent for its restart has been obtained [2]. - The restart of Unit 6 was originally scheduled for October 20 [2].