Special
Report 1:
Our aim with these efforts is always to maintain the world’s highest safety standards.
We have always been aware of the risks of nuclear power, and have worked to assure its safety. Since the Great East Japan Earthquake, we have resolved
never to allow an accident such as that which occurred at Fukushima, and are taking every possible measure to ensure the safety of our nuclear power
plants. This includes adhering to the new regulatory standards.
Minimizing the risks of nuclear power will continue to be our top operational priority, and we believe there is nothing more important than going beyond
the regulatory requirements in taking continuous, voluntary measures to improve and enhance nuclear power safety.
Therefore, we are implementing initiatives based on the risk governance framework directed by our top management, as follows.
Voluntary and Ongoing Measures to Boost Nuclear Power Safety
Everyone in
the region
Listener
Communications
(enhanced)
Risk management
(Enhance)
Improving safety at nuclear power plants
CompanyDoCheckPlanAction
Safety culture (cultivate further)1234
Risk Governance Framework
Nurturing a culture of safety
Cultivate a culture of safety to serve as the foundation of our voluntary and continuous safety enhancement initiatives.1Improving nuclear power plant safety
Repeat the PDCA cycle and employ "hard" and "soft" measures to improve nuclear power plant safety.3Fully communicating with everyone in local communities
Use communications to share information about the above initiatives with everyone in our local communities, listen to the opinions of everyone concerned
and reflect those opinions in our efforts.4Strengthening risk management
Enhance safety by managing risk using the PDCA cycle.21. Safety Efforts at Nuclear Power Plants 2. Active Development and Introduction of Renewable Energy
Section 1
Kyushu Electric Power Summary
Section 2
Management Message
Section 4
Management Base
Section 5
Financial Information
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Kyushu Electric Power Company Annual Report 2014
Kyushu Electric Power applied in July 2013 to confirm that safety measures in place at Sendai (Units 1 & 2) and Genkai (Units 3 & 4) are in compliance
with the new regulatory standards.
Also, on April 30 and June 24 of 2014 we submitted supplements to our application for permission for a change in the reactor installation license per-
taining to the compliance inspections performed up to now on Sendai Units 1 & 2 to the Nuclear Regulation Authority.
The Nuclear Regulation Authority on July 16 acknowledged and announced that the inspection proposal in the application is in line with the new regula-
tory standards. Next, a call was put out for scientific and technical opinions concerning the inspection proposal during the 30-day period from July 17
through August 15.
Kyushu Electric Power will voluntarily continue to employ "hard" and "soft" measures to improve safety, engaging in every possible measure to ensure the
safety of our nuclear power plants.
Kyushu Electric Power’s Safety Measures: In Line with New Regulatory Standards
Previous New Regulatory Standards
Voluntary security precautions, etc., by power
companies for severe accident management
(Voluntary Safety Measures)
Previous regulatory standards
Design standards assuming an accident that
does not damage the reactor core (design standards)
(Scenario involving an accident with a single reactor, etc.)
Precautions against natural phenomena
Fire precautions
Power source reliability
Specifications for other facilities
Earthquake and tsunami resistance specifications
Precautions against natural phenomena
(New; pertaining to volcanic activity, tornadoes and forest fires)
Precautions against the reactor chamber flooding (New)
Fire precautions
Power source reliability
Intentional aircraft collision response
Containment of radioactive substances
to prevent spreading
Prevention of damage to containment vessels
Prevention of damage to reactor core
(Scenario involving accidents with multiple reactors)
Specifications for other facilities
Earthquake and tsunami resistance specifications(2)Severe
Accident
MeasuresNew(anti-terror;
severe
accident
measures)Newor
enhanced
Enhanced(1)Design
standards
New Regulatory Standards Overview
1. Safety Efforts at Nuclear Power Plants 2. Active Development and Introduction of Renewable Energy
Section 1
Kyushu Electric Power Summary
Section 2
Management Message
Section 4
Management Base
Section 5
Financial Information
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Kyushu Electric Power Company Annual Report 2014
Standard Seismic Motion
Safety evaluations are being conducted based on new understanding as a result of surveys of earthquakes and geological features covering a broad range of details
[Earthquakes with specified epicenters at each site]
Based on active fault evaluation by the Headquarters for Earthquake Research Promotion, it has been confirmed that there is no change in the Ss-1 standard
seismic motion (540 gal).
[Earthquakes with unspecified epicenters]
Based on the results of examination of the Hokkaido Rumoi–Nanbu earthquake, a new standard seismic motion of Ss-2 (620 gal) has been added.
[Standard seismic motion used for mission-critical base-isolated structures]
The Ss-L (400 gal) standard seismic motion for use in anti-seismic designs for mission-critical base-isolated structures was added for use in creating base-isolated
structures that can withstand a mild, drawn-out earthquake
Standard Tsunami
Rather than assuming that our current store of knowledge and data is all there is, our safety evaluations are conducted from the perspective that something may
occur that exceeds what is known.
The standard tsunami has been reevaluated to cover tsunamis stemming from an interplate earthquake (Mw 9.1) in the Ryukyu Trench, to a generator (in the vicin-
ity of the sluice gate) maximum high-water mark of around 5m above sea level (at high tide).
*The generator’s maximum run-up height, taking into account the difference between land subsidence and the tide level, is around 6m above sea level.
A protective wall has been placed around the seawater pump area at 5m above sea level with a retention dam located in front of the sluice to allow the water to
drain when the wave recedes as well.
Response to New Standards (main efforts at the Sendai nuclear power plant)
Standard Seismic Motion for the Sendai Nuclear Power Plant
Speed (cm/s2)1,800
1,500
1,20090060030001010.10.01 Period (s)
Ss-1 standard seismic
motion (540 gal)
Ss-2 standard seismic motion
(620 gal) formulated based on
examination of the Hokkaido
Rumoi–Nanbu earthquake
Outline of the Hokkaido Rumoi–Nanbu Earthquake
Ryukyu Trench
(Assumed interval)
Nagasaki
Spur fault
Sendai Nuclear Power Plant
Seawater pump area
Barrier wall
Barrier trench
Retention dam
z Date:
December 14, 2004
Rumoi
z Magnitude:
Mw5.7
Established position
of standard tsunami
Tsunami diffusion
Tsunami
occurrence
Height of tsunami in the
vicinity of the sluice gate
High-water mark of
around 5m above sea level
Site height
13m above
sea level
Earthquake
Around 8km
Tsunami source assumed in tsunami evaluation Outline of tsunami evaluation
Seawater pump area waterproofing measures
1. Safety Efforts at Nuclear Power Plants 2. Active Development and Introduction of Renewable Energy
Section 1
Kyushu Electric Power Summary
Section 2
Management Message
Section 4
Management Base
Section 5
Financial Information
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Section 3
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Kyushu Electric Power Company Annual Report 2014
Evaluating Volcano Impact
Calderas that were the sites of catastrophic eruptions in the past would be monitored.
Regular monitoring of volcanoes for changes (diastrophism and seismic activity measure-
ment data, collection and analysis of data released by public organizations)
In the event of the possibility of a catastrophic eruption, the reactor would be shut down
and fuel removed.
Implementation of continuous efforts, such as the creation of an actual system by estab-
lishing a monitoring committee, and the gathering of input from experts.
Reactor Core Damage Prevention
Measures are taken to cool the interior of the reactor through the use of
portable injection pumps and mobile high-capacity pump trucks to prevent
damage to the fuel (core) in the reactor.
Serious Accident Response Measures (Main Efforts at the Sendai Nuclear Power Plant)
Genkai Nuclear Power Plant
Sendai Nuclear Power Plant
160km
160km
Mt. Aso Aso caldera
Kakuto-Kobayashi caldera
Ata caldera
Kikai caldera
Ikeda
Sakurajima
Mt. Kaimondake
Ioushima Island, Satsuma
Aira caldera
Mt. Kirishimasan
Wakamiko
Volcanoes Monitored
Spent Fuel-Rod Storage Pool Cooling
Measures are taken that employ submerged pumps to cool the spent fuel-
rod storage pool and prevent damage to fuel rods.
Establishment of Emergency Response Posts for Maintaining Functions
as an On-Site Command Center
Established substitute emergency
response posts.
Establish mission-critical anti-seismic
building (fiscal 2015).
Mobile high-capacity pump truck
Substitute emergency response post
Spent fuel-rod pit
Submerged refill pump
Portable
injection pump
Portable injection
pump spraying
Intermediate
holding tank
Spent fuel-rod
storage pool
Freshwater
reservoir/
seawater
Prevention of Damage to Containment Vessels
Measures are taken to cool and decompress the container vessel through
the use of portable injection pumps and other equipment, to prevent hydro-
gen explosions and damage to the containment vessel that encapsulates the
radioactive substances.
Containing the Spread of Radioactive
Substances
Measures are taken to contain the spread
of radioactive substances into the atmo-
sphere, for example if the containment
vessel is damaged.
Power Source Support
Functions
Diversify of power
supply options.
Discharge test using a water cannon
Mobile high-capacity generator
(alternate current)
1. Safety Efforts at Nuclear Power Plants 2. Active Development and Introduction of Renewable Energy
Section 1
Kyushu Electric Power Summary
Section 2
Management Message
Section 4
Management Base
Section 5
Financial Information
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Section 3
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Kyushu Electric Power Company Annual Report 2014
Q. How is the atmosphere at the plant, and what sort of efforts will you be engaging in
from now on?
A. The Nuclear Regulation Authority announced the Sendai nuclear power plant’s draft inspection
record, and while that has increased our motivation toward getting the plan restarted, we also
feel a lot of pressure.
We feel a sense of tension as we work to implement the safety measures in the new regula-
tory standards at the plant. Everyone at the plant and in our partner companies is making safety
their top priority, and we are giving our all in a unified effort as we make our preparations.
Repeated drilling is vital to ensuring that from now on each of us sticks to his post and
responds appropriately at all times, no matter what.
Everyone at the plant is working as one on safety measures and
drills to bring about a restart of operations.
Nobuhiko Fujiwara
Executive Officer
General Manager of Sendai Nuclear Power Plant
Q. As plant chief, what is foremost in your mind?
A. I think that no matter what we do to shore up the facility itself, the most important thing is the ability of our people, by which I mean the intuition that comes from
using all one’s senses. Our people must watch, pay close attention, and remain aware so as not to let any changes escape their attention.
There are many people working at the nuclear power plant, including those from our partner companies. I believe that communications, by which each person
speaks his mind and pays heed to the thoughts of his associates, are important to each of us understanding co-workers, connecting with them, and performing as
a member of the organization.
I myself tour the site daily, including the business offices, and do my best to foster opportunities for communications so I can get to know everyone at the plant
as an individual and get a sense of what they are like.
Interview with the Chief of the Sendai Nuclear Power Plant
Drills at the Sendai nuclear power emergency response posts
(Collaboration through teleconferencing with the Prime Minister’s official residence and others)
(People)
Visits
Explanatory
meetings
Power plant
tours
Total
FY2013
Approx.
33,000
Approx.
39,000
Approx.
9,000
Approx.
81,000
FY2012
Approx.
23,700
Approx.
28,800
Approx.
10,500
Approx.
63,000
Results of our Communications Program (Throughout Kyushu)
Communications Program
We are engaging in a face-to-face communications program involving visits
to provide explanations and power plant tours throughout Kyushu to improve
understanding of the safety measures implemented at our nuclear power
plants. We will strive to disseminate information appropriately and accurately
in order to maintain close ties with national and related government bodies, as
well as affiliated institutions.
Conducting Drills in Conjunction with the National and Local Government
The first national government-sponsored nuclear power emergency drill, which
was based on a new disaster prevention framework created to reflect the
lessons learned through the Fukushima Unit 1 accident, was held in October of
last year.
1. Safety Efforts at Nuclear Power Plants 2. Active Development and Introduction of Renewable Energy
Section 1
Kyushu Electric Power Summary
Section 2
Management Message
Section 4
Management Base
Section 5
Financial Information
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Section 3
Special Report
Kyushu Electric Power Company Annual Report 2014