Abnormal rise of radioactive dosage value at site boundary (INES Level 4)

Print View Posted on: 12 March 2011

Event Date: 12 March 2011 Event Type: Power Reactor
Event Location: Japan, FUKUSHIMA-DAIICHI-1 INES Rating: 4 (Provisional)

On 12 March 2011, Fukushima Dai-ichi Nuclear Power Station Unit 1, which is in rated power operation, has generally shut down around 2:46pm (JST) in March 12, 2011 because of the Tohoku regional Pacific Ocean Offshore Earthquake.
After that, the radioactive dosage value at site boundary had exceeded the limit value.

INES Rating: 4 - Accident with local consequences (Provisional) as per 12 March 2011
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? Yes
Contamination spread within the facility? Yes
Damage to radiological barriers (incl. fuel damage) within the facility? Yes
Degradation of Defence In-Depth Yes
Person injured physically or casualty? Yes
Is there a continuing problem? Yes

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