NISA said on Aug. 30 that it has confirmed a total of 14 faults and other locations whose possibility of turning into active faults in the future cannot be ruled out near the Fukushima No. 1 and No. 2 nuclear power plants and Japan Atomic Power Co.’s Tokai No. 2 Power Station in Ibaraki Prefecture.

NISA had instructed plant operators to re-evaluate those locations after aftershocks following the March 11 Great East Japan Earthquake triggered the Yunotake fault in Iwaki, Fukushima Prefecture, to slip even though it had been believed to be inactive.

As a result of the re-evaluation, it emerged that five locations near the Fukushima nuclear plant, including the Yunotake fault, have a possibility of moving in the future due to crustal twists and increased seismic activity in the wake of the March 11 quake. A total of nine locations near the Tokai No. 2 Power Station and the Japan Atomic Energy Agency’s Tokai nuclear fuel reprocessing plant were also revaluated….http://mdn.mainichi.jp/mdnnews/news/20110831p2a00m0na024000c.html

The country’s 54 reactors were originally licensed for 30 years and operators can apply for 10-year extensions up to a maximum of six times. Twenty-one reactors will soon require license extensions, according to data from power companies and the World Nuclear Association. Of those, seven will enter their fifth decade if extensions are granted — which should be avoided, according to a metallurgy professor.

“Nuclear reactors shouldn’t be in operation for more than 40 years,” said Hiromitsu Ino at the University of Tokyo. “You can renew electrical wiring and other parts but you can’t do anything with their pressure vessels. They just get old and deteriorate, increasing the risk of accidents….http://search.japantimes.co.jp/cgi-bin/nn20110830n1.html