- At 6:00 pm on October 28, 2011, a full-scale operation of the PCV gas
control system started. From 10:21 am to 12:35 pm on February 9, for
the reliability improvement of nitrogen injection, we are working for
installing additional flow meter to the nitrogen injection line of the
Primary Containment Vessel (PCV) of Unit 2. Although we suspended the
injection temporarily, there is no significant change of the parameter.
- At 10:46 am on December 1, 2011, we started the nitrogen injection to
the Reactor Pressure Vessel.
- At 11:50 am on January 19, 2012, we started the operation of the spent
fuel pool desalting facility.
* In the Chapter 12 of Nuclear Reactor Facilities Security Regulation
"The Way of Ensuring Mid-term Security", as the treatments like
"Operational limitation" or "Measures required in case of not
satisfying the operational limitation" are determined, it is supposed
the operator act per the required measures if it fails to satisfy the
operational limitation. This time, to implement maintenance works, we
suspended the nitrogen injection into the PCV of Unit 2 (from 10:21 am
on February 9 to 12:35 pm on February 9) by conducting a planned shift
beyond the range of operational limitation. www.tepco.co.jp