On June 7, 2011, we received the instruction document*1 from NISA with
regard to "anti-earthquake countermeasures of the switchyard etc. with a
view to securing reliability of offsite power supply to Nuclear Power
Stations etc (instruction)".
As per the instruction document, we compiled the status of the evaluation
regarding the possibility of collapse, damage etc. to the electrical
facilities such as switchyards at our Nuclear Power Station and reported to
NISA on July 7, 2011.
(Previously announced on June 7 and July 7, 2011)
On January 19, 2012, we received the additional instruction document with
regard to "anti-earthquake countermeasures of the switchyard etc. with a
view to securing reliability of offsite power supply to Nuclear Power
Stations etc (additional instruction)"*2 from NISA .
(Previously announced on January 19, 2012)
We hereby announce that as per the instruction document we compiled the
implementation plan for evaluating anti-earthquake countermeasures of the
switchyards etc. and reported to NISA today.
Based on this implementation plan, we will make evaluations and implement
the measure based on the evaluation results.
END
○Attachment (The attachment file will be posted later.)
Implementation plan to evaluate anti-evaluation plan to secure reliability
of offsite power supply to Nuclear Power Stations
*1 Instruction document
"Anti-earthquake Countermeasures of the Switchyard etc. With a View to
Securing Reliability of Offsite Power Supply to Nuclear Power Stations etc
(instruction)"
(06.07.2011 NA No. 1)
The Nuclear and Industrial Safety Agency ("NISA") received from General
Electricity Utilities, etc., the reports on May 16, 2011 related to NISA's
directions in the 04.15.2011 NA No. 3 dated April 15, 2011 regarding the
securing reliability of external power supply for nuclear power stations
and reprocessing facilities ("NPS, etc."). Today, NISA conducted evaluation
of the subject reports.
In addition, NISA received a report from the Tokyo Electric Power Co. Inc
("TEPCO") on May 23, 2011 regarding the cause for the damage related to the
electric equipment inside and outside Fukushima Dai-ichi Nuclear Power
Station ("NPS") according to the 05.16.2011 NA No. 3 dated May 16, 2011.
According to this report, the circuit breakers, etc., were damaged at the
switching yards related to Units 1 and 2 of the Fukushima Dai-ichi NPS due
to the earthquake.
Considering the above assessments and reports, NISA requests General
Electricity Utilities, etc., to implement the following items from the
perspective of securing reliable external power supply. Moreover, NISA
requests submission of reports regarding the state of implementation for
these measures by July 7, 2011.
Required Items
1.Assess the impact of the possibility for the occurrence of equipment
falling over or damage, etc. causing malfunctions in the electric
equipment of the switching yards, etc. at General Electricity Utilities'
NPS, etc., in consideration of the analysis results of the earthquake
records observed at TEPCO's Fukushima Dai-ichi NPS due to the 2011 Off
the Pacific Coast of Tohoku Earthquake.
As an aside, for these assessments, setting for the seismic force at each
NPS, etc. at the surface level as a standard related to the switching
yards, etc., analyze the stress occurring at the electric equipment, and
evaluate it by comparison with the structural strength of the subject
electric equipment.
2.If by the assessment in above-described 1, it is determined that a
possibility for the occurrence of equipment falling over or damage, etc.
causing malfunctions exists, decide the countermeasures against
earthquakes for the subject electric equipment.
*2 Instruction document
"Anti-earthquake Countermeasures of the Switchyard etc. with a View to
Securing Reliability of Offsite Power Supply to Nuclear Power Stations etc
(additional instruction)
We have provided a Japanese press release version of the instruction
document received from NISA. However, at this time we have reserved the
right to not provide an English version due to potential misunderstandings
that may arise from an inaccurate rendering of the original Japanese text.
We may provide the English translation that NISA releases in our press
releases. However, in principle we would advise you to visit the NISA
website for timely and accurate information. (will be announced once NISA
announces English version of this instruction document)