The cooling system of the third reactor at the Fukushima nuclear power plant has stopped circulating water following a powerful 7.3 offshore earthquake.

TEPCO said it managed to restart the system some 90 minutes after the failure.

The cooling system servicing the Unit 3 spent fuel pool was not able to circulate water to cool the nuclear fuel because of a broken pump, according to the Nuclear Regulatory Agency.

The temperature in the pool went up to 28.7 degrees Celsius. It takes up to seven days for temperatures to rise to 65 degrees Celsius, which is the upper operational limit, Japan’s national nuclear agency said.

At such a pace, the cooling system failure posed no “immediate danger,” although the agency admitted “gradual” rise in temperatures.

The exact cause of the cooling system stoppage is currently unknown. However, the system might have been “shaken” during the earthquake, according to nuclear agency officials, as reported by NHK. The station’s storage pool currently contains 2,544 spent fuel rods. No cooling water leaks or any other “abnormalities” have been reported.

The first tsunami wave which hit the nuclear power plants was about one meter high, while the second was “not very high,” according to TEPCO. There has been no “major physical damage” to the nuclear power plants, NHK reported.

The initial 7.4 magnitude quake struck at 5:59am JST at a depth of 25km, according to Japan’s Meteorological Agency. At least seven aftershocks followed the initial jolt. The powerful earthquake prompted officials to issue a tsunami warning and announce the evacuation of the areas close to the shore.

Several tsunami waves have already struck the land, and even more powerful waves are expected to occur very soon. There are no reports on damages so far, while at least six people suffered minor injuries during the quake and tsunami, NHK reported.


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