Japan Probes Nuclear Cooling System Shutdown After Earthquake
- Tsunami warnings lifted following magnitude 7.4 tremblor
- Country has world’s strictest atomic plant safety rules: Suga
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Japan is investigating why a cooling system used to store nuclear fuel rods was temporarily knocked offline at Tokyo Electric Power Co. Holdings Inc.’s shuttered Fukushima Dai-Ni atomic plant after a 7.4 magnitude earthquake struck the same region devastated by a tsunami in March 2011.