Home > News > Japan – One reading of Fukushima reactor exceeds 80 C

Japan – One reading of Fukushima reactor exceeds 80 C

Monday, February 13, 2012

Laaska News  Feb. 13, 2012

The operator of the Fukushima Daiichi nuclear power plant says the No.2 reactor is in a state of cold shutdown. This is despite the fact one of its thermometers showed a temperature above 80 degrees Celsius on Sunday.

The reading of the thermometer at the bottom of the reactor began to rise late last month, prompting TEPCO to increase the injection of water into the reactor.

Although the reading temporarily declined, it started to rise again on Saturday and reached 82 degrees at 2:20 PM on Sunday.

The government and TEPCO declared in December that all the reactors were in a state of cold shutdown, with temperatures below 100 degrees.

At that time they set guidelines to keep reactor temperatures at a maximum of 80 degrees, given the thermometers’ margin of error of up to 20 degrees.

This is the first time a temperature reading has exceeded 80 degrees Celsius since the declaration was made.

TEPCO reported the reading to the Nuclear and Industrial Safety Agency.

TEPCO maintains the reactor is in a state of cold shutdown for a number of reasons.

Two other thermometers installed at the same height as the one in question show temperatures dropping to around 35 degrees.

The readings of 3 other thermometers placed about 1.5 meters lower fell as TEPCO increased the amount of water injected into the reactor.

A study of air samples collected around the reactor shows no sign of nuclear criticality occurring at the unit.

TEPCO is increasing the volume of water poured into the reactor and looking into the cause, including a possible thermometer malfunction.

The nuclear safety agency also suggests that something is wrong with the thermometer. It has instructed TEPCO to consider ignoring the thermometer’s reading when monitoring the reactor.

The agency has required the utility to report how it will check the status of the reactor.

TEPCO says it will carefully monitor the reactor and will not rule out the possibility that its temperature might actually be rising.
NHK.
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