In connection with the loss of offsite power source at Higashi-dori Nuclear 
Power Station of Tohoku Electric Power Company, which was caused by 
Earthquake Off the Coast of Miyagi Prefecture on April 7th, 2011, we 
received an order*1 from Nuclear and Industrial Agency to apply for 
approval of modification on Safety Regulations on Nuclear Reactor 
Facilities*2. Today, we applied to Ministry of Economy, Trade and Industry 
for approval of modification on Safety Regulations on Nuclear Reactor 
Facilities of Kashiwazaki-Kariwa Nuclear Power Station.

In accordance with the amendment of the interpretation of ministry 
ordinance about restrictions on plant operation, being"there must be two 
operable emergency generators during cold shutdown and fuel replacement," 
as to the restrictions on plant operation in the safety regulations which 
are associated with unoperated diesel generators for emergency we modify 
the description as attached.

Attachment: Comparison chart for amendment of safety regulations on nuclear 
            reactor facilities for Kashiwazaki-Kariwa Nuclear Power Station
                                                               (PDF 37.2KB)

*1 The order issued on April 9th, 2011, is as below.

"Regarding interpretation of safety regulations on emergency generating 
facilities: an order"(April 9, 2011)

The Earthquake Off the Coast of Miyagi Prefecture occurred on April 7, 2011 
and Higashi-dori Nuclear Power Station of Tohoku Electric Power Company 
lost the offsite power and emergency generating facilities started up to 
maintain the power source. Although the offsite power has been restored, 
emergency generating facilities shut down due to some troubles. Thus, it 
was reported as a failure to secure the restriction of operation regulated 
in the safety regulations.
Amongst the matters on operation of nuclear reactors facilities in the 
safety regulations stipulated in such as Article 16.7 of the current "Rules 
on the Installation and Operation of Commercial Power Reactors" (No. 77 of 
Ordinance of Ministry of International Trade and Industry, of Showa 53 (of 
1978)), the interpretation on restriction of operation requires one 
emergency generating facility operable for each nuclear reactor in the 
condition of cold shutdown such as during regular inspections and fuel 
replacement (which includes the cases of storing spent fuels in spent fuel 
pools). However, in consideration of the accident of Fukushima Daiichi 
Nuclear Power Station caused by Tsunami induced by Tohoku-Chihou-Taiheiyo-
oki Earthquake, 2011, it is extremely important to secure power source. 
Therefore, the interpretation was amended to require two emergency 
generating facilities operable which connect to necessary emergency 
alternate-current high-voltage bus line for each nuclear reactor (when 
power stations have more than one nuclear reactor, they can count the 
number of emergency generating facilities of other units which are 
connected to the necessary emergency alternate-current high-voltage bus 
line.) 
As a result, it is required to immediately take actions for emergency 
safety measures, ordered on March 30, including securing power supply cars, 
fire fighting engines, fire fighting hose and others and also is required 
to immediately implement amendment of safety regulations of "Rules on the 
Installation and Operation of Commercial Power Reactors", which fulfils 
the above interpretation and also is one of the safety measures for 
emergency, by April 28 of this year.

*2 Safety Regulations on Nuclear Reactor Facilities

In accordance with Act on the Regulation of Nuclear Source Material, 
Nuclear Fuel Material and Reactors, Paragraph 1, Article 37, the business 
operator shall draw it up and apply for government's approval. It provides 
overall operation on overall security activities in regard to operation of 
power plant, fuel management and radiation dose management.