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Progress of Unit 1 PCV Internal Investigations – March 18. 2017

Preliminary report of March 12 investigation 1/2

Preliminary report of March 12 investigation 2/2

Impact to the surrounding environment :

The radiation level of 7.8 Sv/h was measured by a dosimeter during the March 18 investigation, but the radiation impact has been reduced by the shielding of PCV concrete walls and steel. No radiation impact has been observed in the surrounding environment.

The investigation is conduced while creating a boundary around the guiding pipe to prevent the air inside the PCV from leaking to the outside.

No significant changes have been observed at the monitoring posts and dust monitors after the investigation, compared to the before.

Real-time data of the monitoring posts and dust monitors along the site boundary are available on the website.

Reference URL:

http://www.tepco.co.jp/en/nu/fukushima-np/f1/index-e.html

http://www.tepco.co.jp/en/nu/fukushima-np/f1/dustmonitor/index-e.html

Monitoring of the plant parameters:

Although the radiation level of 7.8 Sv/h was measured by a dosimeter during the March 18 investigation,it does not mean that a new phenominonhas occurred but rather the area that has not been investigated since the March 2011 accident was investigated for the first time.

Plant parameters are monitored all the time during the investigation, and no significant changes have been observed in the PCV internal temperatures after the investigation, compared to the before.

The condition of cold shutdown has not been changed. Temperature data inside the PCV are available on the website.

Reference URL: http://www.tepco.co.jp/en/nu/fukushima-np/f1/pla/index-e.html

March 22, 2017 - Posted by dunrenard | Fukushima 2017 | Fukushima Daiichi, Reactor 1, Robot Probe