7.3 Magnitude earthquake off Fukushima triggers tsunami warning

RT
Mon, 21 Nov 2016 21:19 UTC

© USGS

A powerful 7.3 magnitude earthquake has struck Fukushima Prefecture in Japan, USGS reported. A three meter tsunami wave alert was issued for Fukushima, Nippon reported.

The quake struck 67km northeast of Iwaki, a city located in the southern part of the Hamadori coastal region of Fukushima Prefecture, Japan.

Comment: Update: Fukushima reactor cooling system stops following quake & tsunami

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 29 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.