The Report #10 summarizes the post-quake status of the Kashiwazaki-Kariwa Nuclear Power Station and gives the overview of the initiatives, trends and other details involving Tokyo Electric Power Company and other relevant organizations.

　 Currently, detailed equipment inspection and restoration work is systematically underway at the Kashiwazaki-Kariwa Nuclear Power Station.TEPCO is to summarize and release inspection results as soon as they are available.
　 See the attachment for the overall status of main inspection and restoration work.

Overall inspection schedule (plan):Excerpt from TEPCO press release issued on September 6

　 The inspection of the upper reactor was conducted from August 21 to 23, and identified no damage, disfigurement or dislodgment.

<Phase 2 (Inspection of the mid reactor --- the reactor core)>

　 The inspection of the mid reactor was conducted from September 14 to October 1, and identified the following:

No damage, disfigurement and dislodgement were found in the upper reactor (apart from sections checked in Phase 1), mid reactor and steam dryer that had been dismounted for outage and temporarily stored in the temporary storage pool.

<Phase 3 (Inspection of the bottom of the reactor)>

　 Inspection preparation commenced on October 2.

　 Reactor opening work takes place from October 2 to 8, to be followed by Phase 1 and Phase 2 inspections.

　 TEPCO defines the management status of non-conformities at power stations into six grades (As – Not applicable) and regularly releases the information.The screening status of non-conformities as of September 26 is as follows.There are 2,850 earthquake-related non-conformities, and most of them are classified as minor events of Grade C or below.

(Note)Examples of Grade C events include “leakage from the mechanical seal of a pump” and “damage to passageway windowpanes” (events concerning human safety), while examples of Grade D events include “valve seat pass that can be addressed with increased tightening”.

　 In an effort separate from the seismic safety assessment, electric utilities have compared the seismic records of the earthquake’s main shock, observed on the foundation level of reactor buildings at the Kashiwazaki-Kariwa Nuclear Power Station, against the benchmark seismic motion used when designing a nuclear power station, so as to examine the earthquake’s impact on important station facilities that serve the functions of “shutting down”, “cooling down” and “containing”.
　 On September 20, the companies compiled and submitted a report to the Ministry of Economy, Trade and Industry, concluding that the safety functions of their key facilities, serving the functions of “shutting down”, “cooling down” and “containing”, will be maintained under a similar earthquake.
　 In regard to this report, the Nuclear and Industrial Safety Agency expressed its opinion that the assessment covered main facilities that serve such functions that count in terms of plant safety, and that the safety functions of these facilities were assessed appropriately.

　 This committee was set up to undertake an investigation into the specific impact of the Niigataken Chuetsu-oki Earthquakeon the power station, and to explore future tasks and actions to be taken by the government and nuclear energy companies in light of this earthquake.
　 Working groups under this committee will examine the following specific issues and submit the findings to the committee for deliberation.The committee convened its third meeting on September 12.

<Working Group on in-house fire fighting corps and liaison / provision of information in relation to the Niigataken Chuetsu-oki Earthquake >

In-house fire fighting corps system

Information liaison system for plant operators

Information provision to local governments and the public

<Subcommittee on anti-quake and structural designs>

Using research data on this earthquake from relevant organizations, observation data of seismic motions and study data used in designing the plant to identify why the observed seismic motions recorded in the earthquake on the foundation level of reactor buildings at the power station were greater than their design figures

Examining the earthquake’s impact on the Kashiwazaki-Kariwa Nuclear Power Station

Examining items that should be reflected to the seismic safety assessment of the Kashiwazaki-Kariwa Nuclear Power Station

Summarizing the insight obtained from this earthquake and identifying items that should be reflected to other nuclear power stations from the perspective of ensuring seismic safety of nuclear facilities

Operation management immediately after an earthquake

Assessment of facility integrity

Establishment of the Fire Management Office

　 In cooperation with the Fire and Disaster Management Agency, the Fire Management Office was established within the Nuclear Emergency Planning Section to urgently compile effective measures for preventing and controlling fires at nuclear power stations, and provide guidance on such measures to electric utilities.
　 At the meeting of the “Working Group on in-house fire fighting corps and liaison / provision of information” convened on September 20, the Fire Management Office presented the policy for reinforcing the in-house fire fighting system (software, hardware) to enhance its abilities for “making immediate response”, “controlling fire” and “sustaining fire fighting activities”.

　 The expert committee on nuclear safety standards has set up the “Fire Prevention and Management Subcommittee” to examine the current fire protection system at the time of earthquake, including a review on the fire protection guidelines.(First meeting: September 25)

　 On August 18, the International Atomic Energy Agency (IAEA) released a report on the inspection carried out by its fact-finding mission from August 6 to 10.The outlines of the report are as follows:

<Outlines of the report by the IAEA fact-finding mission>

Safety related structures, systems and components of the plant seem to be in a general condition much better than expected for such a strong earthquake, with no visible damage.This is probably due to the conservatisms introduced at different stages of the design process.

Any re-evaluation of the seismic safety of the plant in accordance with the new seismic guidelines needs to be done taking into account the effects of this earthquake, and the issue of the potential existence of active faults underneath the site.

Moves by related academic societies

　 On September 11, an emergency forum “Niigataken Chuetsu-oki Earthquake--- What happened at the Kashiwazaki-Kariwa Nuclear Power Station” was convened as part of the 2007 annual conference of the Japan Society of Mechanical Engineers.TEPCO explained the outline of the earthquake as well as the quake’s impact on plant management and facility integrity, which was followed on with an active Q&A session.
　 On September 28, the Atomic Energy Society of Japan conducted a briefing on the Niigataken Chuetsu-oki Earthquakeand the safety of the Kashiwazaki-Kariwa Nuclear Power Station as part of its annual autumn conference for 2007.In various presentations, the following notable opinions were expressed as the “reasons the nuclear reactors maintained their safety functions despite being struck with tremors well above the design basis seismic motion”:

　 Main activities by JANTI, conducted after Report #6 issued on August 10, include visiting relevant overseas organizations for briefing (See Reports #7 and #9), and establishing the Reactor Equipment Integrity Assessment Committee (chairman:Toshiharu Nomoto, professor emeritus of the University of Tokyo) within JANTI to assess and examine the integrity of the power station’s key equipment, which was subject to tremors above the design-basis seismic motion.
　 On September 26, the Committee convened the first meeting, attended by around 60 people including experts of structural strength, inspections and quake resilience, as well as relevant parties representing electric utilities and plant manufacturers.The Committee plans to meet once every month through to the end of this fiscal year.

<Description of content>

Assessing quake damage of individual equipment, and conducting analysis to evaluate the integrity of equipment / parts.Also conducting precautionary assessment on the tolerance level of the current anti-quake design