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Information of Kashiwazaki-Kariwa Nuclear Power Station (The 3rd news)
1.

2.

3.

Summary of the extra news conference by Minister of Economy, Trade andIndustry, Akira Amari (July 20)- Regardless of some effects observed in surrounding facilities, equipment andmachinery, the nuclear reactor units, the most important part of the power
station, automatically shut down safely as designed in the latest earthquake.
- Release of some radioactive materials from the power station were subsequentlyobserved, but it is confirmed today that the release from the main exhaust stackat Unit 7 has stopped.The amount of radiation released into the atmosphere thus
far is ten millionth of the radiation dose people receive naturally in the course ofnormal life.
- The radiation ,released to the sea, contained in contaminated water that leaked
from Unit 6 is equivalent to the amount of radiation in nine liters of radon spa
water and does not affect the surrounding environment.
Acceptance of an IAEA (International Atomic Energy Agency)
investigation
The Governor of Niigata Prefecture has urged the government and the Minister ofEconomy, Trade and Industry to accept an IAEA investigation as soon as
possible, saying that it is imperative to distribute accurate information to theworld in order to swiftly wipe away the anxieties of local residents and the rest ofthe Japanese population.
The government has expressed its readiness to urgently launch specific talks on
the matter with IAEA.
Disclosure of affected locations in the power station to journalists
Tokyo Electric Power Company invited media reporters to view the affected sites
on July 21.
- No.1 Unit Diesel Oil Tank
- No.3 Unit House Transformer- No.3 Unit Main Exhaust Duct
- No.6 Unit Non-radioactive Storm Drain System- No.4 Filtrate Water Tank
- Monitoring Post No.1

4.

Influence on nuclear fuel at the reactor core
At Units 2 to 7, which remain loaded with nuclear fuel, reactor water has been
analyzed to confirm that there is no damage to the loaded fuel.

5.

Current status of the release of radioactive materials
The release of radioactive materials has stopped in the two such cases
identified.The amount of released radiation was negligible, and has been assessed
as having no impact on the environment. The underlined sections indicate new
information that has come to light since issuance of the second report.
Unit 6
Unit 7
Water in the spent fuel pool ofunit 6 sloshed around. Someleaked into non radiation
In the operation process ofcontrolled area on the third floor
automatic reactor shutdown, there
and mezzanine, and waswas a delay in stopping theEstimated discharged to the sea via aturbine’s ground exhauster.
causes and discharge channel.
Consequently, the residual iodine
release It is presumed that water spilled
and other radioactive particulatesroutes over from the spent fuel pool toin a condenser were drawn into
the reactor building refuelingthe exhauster and released into
floor (controlled area)
the air via the exhaust stack.
subsequently dripped down to theuncontrolled area via cable andconduit of the refueling machine.
Amountreleased
Approx. 4×108 Bq (in theinto the Approx. 9×104 Bq (in the sea)
atmosphere)
environment-9Approx. 2×10-7 mSv
Exposure Approx. 2×10 mSv
Substantially lower than 1 mSv, the legally-defined limit ofdose
radiation dose to the public per annum
The release of radioactive
materials has stopped. The
Current The release of radioactive
radiation readings from mainstatusmaterials has stopped
exhaust stacks at Units 1 to 6 are
below the limit of detection.
As of July 22, the power station has identified approximately 70 locations that
suffered quake damage, and will continue with a detailed investigation.
Above information will be updated as the further investigation by TEPCO will becarried forward.
＜References＞ Tokyo Electric Power Company
Nuclear and Industrial Safety Agency
Nuclear Safety Commission of Japan

Japan Nuclear Technology InstituteRev. 0July 23, 2007

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