2011 03 22 Japan Factsheet

2011 03 22 Japan Factsheet - Tohoku Pacific Earthquake and...

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Tohoku Pacific Earthquake and the seismic damage to the NPSs 2011 Mar 21 as of 10:30 am (JST) Ministry of Economy, Trade and industry The Tohoku Pacific Earthquake of historic magnitude 9.0 struck the northeastern part of Japan at 2:46 pm on March 11th, 2011. At the time of the earthquake occurrence, 3 reactors (Units 4, 5 and 6 at Fukushima Dai-ichi (I) Nuclear Power Station of Tokyo Electric Power Co. Inc.(TEPCO)) were under periodic inspection outage, and 11 reactors (Units 1, 2 and 3 at Onagawa Nuclear Power Station of Tohoku Electric Power Co. Ltd.; Units 1, 2 and 3 at Fukushima Dai-ichi (I) Nuclear Power Station of TEPCO; Units 1, 2, 3 and 4 of Fukushima-Dai-ni (II) Nuclear Power Station of TEPCO; and an unit of Tokai Dai-ni (II) Nuclear Power Station of Japan Atomic Power Co. Ltd.) were automatically shut-down. After the automatic shut-down, Units 1, 2 and 3 at Onagawa, Unit 3 at Fukushima II, and the Unit at Tokai II have been cold shut down safely. As for the Units 1, 2 and 4 at Fukushima II, TEPCO operator of the station reported the nuclear emergency situation to Nuclear and Industrial Safety Agency (NISA), but afterward the three units have been cold shut down.
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The massive earthquake triggered the devastating Tsunami wiping away houses, buildings, cars along the widespread areas of the northeast coast. The Tsunami also knocked out the emergency power generators and the pumps supplying seawater to the cooling system and disabled other function necessary for cooling down the reactor cores of Units 1, 2, and 3 as well as spent fuel kept in the pools inside reactor buildings of all units at Fukushima I. Consequently, the pressure and temperature of reactor cores and the water temperature of spent fuel storage pools went up. For counter measures, seawater is being injected into the reactor pressure vessels of Units 1, 2 and 3. At the same time, police, fire brigade and the Self Defense Force are attempting to pour water into the spent fuel storage pool of Unit 3 by spraying seawater from helicopters, water cannon trucks and fire engine. Further, TEPCO
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This note was uploaded on 11/15/2011 for the course PUBPOL 481 taught by Professor Duderstadt during the Winter '11 term at University of Michigan.

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2011 03 22 Japan Factsheet - Tohoku Pacific Earthquake and...

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