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Title: Release of a very small quantity of radioactive materials outside of the radiation controlled area of the Tokai-Daini Power Station, owned by Japan Atomic Power Company
Source: METI Press Release
Date: March 28, 2011
Today (March 28, 2011), Nuclear and Industrial Safety Agency (NISA) received a report from Japan Atomic Power Company (JAPC) regarding the release of a very small quantity of radioactive materials outside of the radiation controlled area of the Tokai-Daini Power Station (BWR, rated electric power: 1100MWe), in accordance with the “law for the regulation of nuclear source material, nuclear fuel material and reactors”.
This event did not occur as a direct result of the Tohoku-Pacific Ocean Earthquake.
At about 21:50 on March 11, 2011, maintenance personnel who were checking the status of equipment found water had flooded from a drain funnel (*1) installed in battery room 2B of the complex building (non-radiation controlled area).
In subsequent investigations, tritium was detected as a result of the tritium measurement of samples collected prior to draining the water, and Co-58 and Co-60 were detected as a result of the nuclide analysis using a germanium semiconductor detector.
Taking into consideration the dilution effects due to the seawater pump, the radioactive concentration of the drained liquid waste in this event was approximately 1/4000 of the statutory concentration limit for outside the environmental monitoring area, and did not cause an impact on the environment due to radioactive materials.
When the event occurred, local nuclear safety inspectors rushed to the site to confirm plant safety, and are continuing to confirm company responses to the event.
Title: Receipt of a report regarding a legally reportable event that occurred at the Tokai-Daini Power Station, owned by Japan Atomic Power Company
Source: Press Release Information; Nuclear and Industrial Safety Agency (NISA) — Ministry of Economy, Trade and Industry (METI)
Date: September 2, 2011
Originally reported on March 28 as a level 0-, the least significant event classification:
h/t Anonymous tip
Published: April 21st, 2012 at 1:04 pm ET
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