INES level 1 event at Tokai nuclear plant after March 11 quake — Cobalt-60 detected outside of radiation control area — Safety inspectors rushed to site (PHOTOS)

Published: April 21st, 2012 at 1:04 pm ET
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Follow-up to: [intlink id=”must-see-report-introduced-by-top-govt-official-hosono-actually-other-reactors-are-all-in-considerably-severe-condition-besides-fukushima-daiichi-14-reactors-total-dai-ni-onagawa-tokai” type=”post”]{{empty}}[/intlink]

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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