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International Atomic Energy Agency Fukushima Daiichi Nuclear Accident Update, 27 March 2011 (01:15 UTC)


Vienna, Austria–(ENEWSPF)–27 March 2011 – 01:15 UTC. 

Brief Update on State of Fukushima Daiichi Reactors

AC Power-Units 1 to 4

The restoration work of off-site (i.e., grid) power is still in progress. Off-site power is now connected to Units 1 to 4.
Power distribution panels in the Power Centres of Units 2 and 4 have been connected to the off-site electricity supply, but individual components are still being checked prior to being energised.
The lighting in units 1, 2 and 3 control rooms has been restored. Some instrumentation was recovered for units 1, 2 and 4. However, due to the extent of damage inflicted by the earthquake and tsunami, at present it is not possible to estimate when the equipment may be returned to service.

AC Power-Units 5 and 6

Off-site power has been restored.

Unit 1

Fresh water continues to be injected into the reactor pressure vessel.
As of 23:00 UTC 25 March, white smoke was confirmed to be emanating continuously from the reactor building.
Water sample taken from the stagnant water on the basement floor of the turbine building shows the presence of iodine-131, cesium-137 and cesium-134 to a level comparable to that measured in the turbine building of unit 3 where three workers were exposed to elevated levels of radiation on 24 March.

Unit 2

Fresh water continues to be injected into the reactor pressure vessel.
As of 23:00 UTC 25 March, white smoke was confirmed to be emanating continuously from the reactor building.
The spent fuel pool temperature increased and then stabilized at 57 degrees Celsius as of 00:30 UTC 26 March.

Unit 3

Fresh water is being injected into the reactor pressure vessel.
The temperature at the bottom of reactor pressure vessel has decreased to 100.4 degrees Celsius at 13:00 UTC 26 March. Seawater injection to the spent fuel pool is on-going.
White smoke emanating from the reactor building was still being observed as of 23:00 UTC 25 March.
The dose rate in the reactor containment vessel and suppression chamber continued to decrease to 36.1 sieverts per hour and 1.4 sieverts per hour, respectively, as of 13:00 UTC 26 March.

Unit 4

From March 22 to March 25, 130 to 150 tonnes of seawater was poured into the spent fuel pool each day using a concrete pump. Sea water was also poured in through spent fuel cooling system from 21:05 UTC 24 March to 01:20 25 March.
White smoke was still being observed coming from the reactor building as of 23:00 UTC 25 March.

Unit 5

The reactor remains in cold shutdown. Off-site power has been restored. The reactor water temperature increased to 43.8 degrees Celsius.
The temperature in the spent fuel pool increased to 42.8 degrees Celsius as of 02:00 UTC 26 March.

Unit 6

The reactor remains in cold shutdown. Off-site power has been restored. The reactor pressure vessel water temperature decreased to 21.3 degrees Celsius.
The spent fuel pool water temperature has slightly increased to 30.0 degrees Celsius.

Source: iaea.org


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