On August 6, 2011, we are going to commence the 16th regular inspection for
Unit 1 of Kashiwazaki Kariwa Nuclear Power Station (boiling water reactor
type, 1,100 MW of rated output). The details are shown below.
1.Planned working period for the inspection
From August 6th, 2011 (60 days)
2.Main equipment that will be inspected
(2) Reactor cooling system facility
(3) Measuring control system facility
(4) Fuel facility
(5) Radiation control facility
(6) Disposal facility
(7) Primary containment facility
(8) Emergency reserve generation facility
(9) Steam turbine
3.Planned construction during the regular inspection
(1) Replacement of fuel assemblies
176 fuel assemblies (764 in total) will be replaced.
(2) Replacement construction for reactor core isolation cooling system
New ventilation pipes for the pipes in the core isolation cooling
system will be installed that exhaust mixed gas (hydrogen and oxygen)
in order to prevent the gas from accumulation that is generated
through radiation dissolution in the reactor.
(3) Countermeasures against tsunami
The following equipment will be arranged or installed for the
countermeasures against tsunami
-Installing emergency high voltage distribution boards and laying
cables for emergency high voltage distribution boards of the
-Arranging alternative seawater thermal converter equipment
-Installing top ventilation equipment for the reactor building
(1)Equipment inspection based on the special maintenance plan
In order to monitor continuously the influence of the Nigata Prefecture
Chuetsu Oki Earthquake, which occurred on July 16, 2007, we will
conduct nondestructive inspection for the parts which have been judged
that they are not influenced by the earthquake after some fatigue
assessment and insect the equipment of which function works properly
in our opinion and therefore no countermeasures were taken although
subtle influence was confirmed.
(2)Inspection for ventilation air conditioning ducts
As a countermeasure against malfunction of ventilation air conditioning
ducts that was confirmed in Fukushima Daiichi Nuclear Power Station in
March, 2008, we will inspect the ventilation ducts.
(3)Inspection of pipes for measuring jet pump*flow rate
As an investigation for the causes with regard to malfunction of pipes
for measuring jet pump flow rate that was confirmed in Unit 2 of
Kashiwazaki Kariwa Nuclear Power Station on March 12th, 2010, we will
inspect pipes for measuring jet pump flow rate during the inspection.
With respect to activation of the Unit 1, we will consult the national and
local government adequately and deliberately.
Static pumps with no rotating parts that are used in order to circulate
cooling water in the reactor by water pressured by reactor cooling
<Reference> Status of Our Nuclear Power Stations
Fukushima Daiichi and Fukushima Daini
All the units are shut down due to the Tohoku Chihou Taiheiyou Oki
Earthquake of which epicenter is Sanriku Oki, which occurred on March
Unit 1 (1,100 MW) Scheduled to be inspected from August 6th
Unit 2 (1,100 MW) Under regular inspection
Unit 3 (1,100 MW) Under regular inspection
Unit 4 (1,100 MW) Under regular inspection
Unit 5 (1,100 MW) In operation
Unit 6 (1,356 MW) In operation
Unit 7 (1,356 MW) In operation
The total output of the plants in operation is 3,812 MW of 3 units in total.