Hokkaido Electric Power andNuclear Power

Tatsuro Osaki, Nuclear Energy Planning Group,
Nuclear Energy Business Management Division,
Hokkaido Electric Power Co.

1

Table of Contents

1. Self-introduction
2. About Hokkaido Electric Power Company
3. Reasons for Hokkaido Electric Power topromote nuclear power generation
4. Efforts to restart the Tomari Power Station
5. Life in Tomari
6. To everyone

2Table of Contents

1. Self-introduction
2. About Hokkaido Electric Power Company
3. Reasons for Hokkaido Electric Power topromote nuclear power generation
4. Efforts to restart the Tomari Power Station
5. Life in Tomari
6. To everyone

3What is an electric power company?

A company that makes and delivers electricity
to customers

Any kind of electricity? ⇒NO
Delivering high quality, inexpensive electricity
For what?

No power failure. Stable voltage and frequency.

To enrich Hokkaido

The Significance of Working for Hokkaido
Electric Power Company

A company that makes you feel "for Hokkaido
4

May 1, 1951 Established
Head office building of Hokkaido Electric Power Company
at the time of its establishment

5System size

Source: Our Company

6

Production

DistributionSales

石狩湾新港発電所

5,000employees

Various fields of work7Circulation

Production

Thermal power station

Power line

Sales

Transformer substation

Engineering department(Power transmission,substation and grid operation)

Power line

CustomerPower distribution unit

Nuclear power plant

SupportHydroelectric plant
Thermal Power Unit
Nuclear Energy Business
Management Division

Hydraulics Department(Electricity and CivilEngineering)

Public Works Department(Civil engineering andconstruction)

Information andCommunication Department

SpreadCommunications Network OfficePlanning
Department,
Corporate
Planning OfficeInstitute forgeneral research

General affairs
department

General Energy
Division

Environment Room

Personnel andLabor Relations
Department

Material DepartmentSecretariat

8(Recent Topics)◼ Recognized for four consecutive years by the Ministry of Economy,
Trade and Industry and the Japan Health Council as a company thatexcels in health management, as a "White 500" corporation [March2023] => Here
Health management

Strategically implement health management from a managerial
perspective, based on the belief that efforts to maintain andpromote employee health are an investment that will increase
profitability and other benefits in the future.

◼ First company headquartered in Hokkaido to be certified as a DX(Digital Transformation) company under the DX (DigitalTransformation) certification system established by the Ministryof Economy, Trade and Industry. February 2022] ⇒HereDX Certification System
The Ministry of Economy, Trade and Industry (METI) has established the DXReady certification system based on the Act on Promotion of Information
Processing in order to encourage companies to voluntarily engage in DX-relatedactivities.
The Ministry of Economy, Trade and Industry (METI) has established a system tocertify companies that have been confirmed to be "DX-Ready" in accordancewith the Act on Promotion of Information Processing in order to encouragecompanies to voluntarily engage in DX initiatives.

9Table of Contents

1. Self-introduction
2. About Hokkaido Electric Power Company
3. Reasons for Hokkaido Electric Power topromote nuclear power generation
4. Efforts to restart the Tomari Power Station
5. Life in Tomari
6. To everyone

The key phrase is "high quality andlow price.
10Japan, a country without natural resources (1/3)
・Japan's energy self-sufficiency rate is only 11.3%, which is low
compared to other developed countries.
・The use of nuclear power, which can be a quasi-domestic energy
source, will reduce the risk of overseas procurement of energy
resources.

Source: Agency for Natural Resources and Energy website

11

Japan, a country without natural resources (2/3) - Ukraine crisis⚫ Last February Energy
prices rose across theboard following Russia's
invasion of Ukraine.

【Crude oil】

(Derived from: SBI Certificates HP Crude Oil (WTI Crude Oil first 1 year)【Coal】(Source: TRAIDINGCONOMICSHP Coal Futures 1 year)

12Japan, a country without natural resources (3/3) - Toward 2030
・The government's Basic Energy Plan sets a goal of increasing the ratio ofnon-fossil power sources, including nuclear power, by 2030.
・Expanding the use of nuclear power will reduce excessive dependence on
fossil fuels and contribute to a stable supply of electric power.

Source: Partially edited from Enelog Focus Vol. 49, Federation of Electric Power Companies of Japan
Targets for FY2030 are based on the Sixth Basic Energy Plan (approved by the Cabinet in October 2022).

13

Energy situation in Hokkaido (1/3)• Energy consumption per household is similar for hot water, lighting,appliances, etc., but greater for heating (about 3 times greater).
(MJ/household/year)

70,00060,00016,02150,00040,00030,00020,00010,000014,14915,81813,006691
9,333

Approx.
3 times

Whole country
HeatingCooling

32,636

Hokkaido
hot-water
supplyLighting & Appliances

Energy Consumption per Household by Use (FY2017, Hokkaido and Nationwide)
Source: Jyukankyo Research Institute, "Annual Report on Household Energy Statistics.

14

Energy situation in Hokkaido (2/3)• Hokkaido's structure is dependent on petroleum for winterheating demand, etc.

Hokkaido

Whole country
Natural gas and city gas

Composition of total primary energy supply (FY2028)

Source: Hokkaido Economic Handbook 2021, Hokkaido, Japan15

Energy situation in Hokkaido (3/3)
・Nuclear power has been shut down and hermaltpower generation now accounts for about 60% of
total power generation

Thermalpowergeneration
64%

Source: Hokkaido Electric Power Co.

16

Re-energy and nuclear power needed to achieve carbon• Emissions from nuclear power are significantly lower than those from coal-, oil-, andneutrality
LNG-fired power, and comparable to those from renewable energy sources such assolar and wind power.

Source: Nuclear Culture Foundation, "Nuclear Power and Energy Drawings.

17

Power Generation Costs by Source• Coal-fired and LNG-fired power generation costs are high whenfuel cost
increases are factored in.
• Renewable energies (wind and solar) are ostlycdue to issues such as
grid stabilization. Policy to foster renewable energy infrastructure
through feed-in tariffs to compensate for construction costs, etc.
• Nuclear power is less sensitive to fuel prices,but given the risk ofaccidents, there are social costs.

Source: Nuclear Culture Foundation, "Nuclear Power and Energy Drawings.

18

Can we stop thermal power generation altogether?

⇒Adjustment of supply and demand requires thermalpower and other regulating forces(Source︓National Resources and Energy Agency, General Resources Investigation
Committee, Basic Policy Subcommittee, August 26, 2019)19

Summary
Why does Hokkaido Electric Power Company do nuclear power?

⚫ Our mission is to deliver quality, inexpensive electricity to ourcustomers.
⚫ Japan imports 92% of its resources. Especially in Hokkaido inparticular is highly dependent on fossil fuels.
⚫Nuclear power and renewable energy can make a significant
contribution to reducing O2 emissions and achieving a recyclingoriented social environment.
⚫Renewable energy is relatively expensive and nuclear power has aprice advantage.
⚫Renewable energy is affected by nature and weather, making stablesupply difficult.

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Table of Contents

1. Self-introduction
2. About Hokkaido Electric Power Company
3. Reasons for Hokkaido Electric Power topromote nuclear power generation
4. Efforts to restart the Tomari Power Station
5. Life in Tomari
6. To everyone

21Tomari Power Station Overview
Type of reactor: Pressurized Water Reactor (PWR)
Fuel type: Low-enriched uranium
Electricity output: Unit 1: 579,000 kW (started operation in1989)

Unit 2: 579,000 kW (started operation in 1991)
Unit 3: 912,000 kW (started operation in 2009)

Unit 1

写真：北海道電力泊発電所

Unit 2

Unit 322

Overview of the Accident at Fukushima Daiichi Nuclear Power Station• Earthquake tremors are detected and the reactor automatically shuts down.
• External power supply was lost, but the emergency diesel generator on site automaticallystarted up.
• Fuel was cooled, but tsunami hit about 50 minutes after the quake.
• The tsunami made it impossible to supply power from the emergency diesel generator. The
power supply from the emergency diesel generator became unavailable due to the tsunami.
• The pumps to cool the fuel lost power and the fuel melted. Hydrogen is generated andexplodes in the upper part of the reactor building. Hydrogen was generated and explodedin the upper part of the reactor building. Radioactive materials were released into theenvironment.

Source: Atomic Energy Culture Foundation, "Nuclear Power and Energy" Drawings

23Overview of New Regulatory Standards••

The new regulatory standards went into effect in July 2013, based on lessons
learned from the accident at the Fukushima Daiichi Nuclear Power Plant andoverseas findings.
The new regulatory standards significantly strengthen or newly establish existing
regulatory standards, as well as establish "measures against
In addition, the new standards aim to further improve safety by establishing"measures against severe accidents" and "measures against terrorism".

Source: Nuclear Regulation Authority of Japan, etc.

24Safety measures at Tomari Power Station (seawall, watertight door)• New seawalls are placed on solid bedrock as tsunami protection
measures.
• Watertight doors were installed at the building entrances and at theentrances to critical equipment areas to prevent tsunami intrusion.
Layout of new seawall

Design of new seawall
Existing seawall

Seawardside

Watertightdoor(Buildingentrance)

Site elevation

Ground(backfill soil)
Bedrock

ChangeSeawardsideNew
embankment

Site elevation
Ground(backfill soil)

Bedrock

To further enhance safety, a new seawall 19meters above sea level is placed on solid bedrock

Watertight door
(Entrance toarea with criticalequipment)

25

Safety measures for Tomari Power Station (seismic reinforcement)• To ensure safety against earthquakes, we properly evaluate the shaking caused by
the largest possible earthquake and implement seismic reinforcement work based on
this evaluation.

Seismic reinforcement of administrative offices

Seismic reinforcement of piping

26

Safety measures for Tomari Power Station (securing power supply)• To prevent a serious accident such as core damage, it is necessary to keep thefuel cool.
• It is important to secure water to cool the fuel, pumps to inject the water, andpower sources to operate the pumps.
• Further measures are being taken to ensure that the power supply needed to cool
the fuel is not interrupted.

Emergency diesel
generators(Two each in Units 1, 2,and 3 since construction)
External power source(received from power lines)

Multiplexed external power supply for Unit 3

Compliance with new regulatory
standards

6 units of alternative emergency power
supply (permanently installed)

Deployment of 8 portable
alternative power supply vehicles

27

Safety measures for Tomari Power Station (securing cooling water)• To prevent serious accidents such as core damage, it is necessary to keep
the fuel cool
• In addition to the power supply, it is important to secure "pumps" and"water sources" to supply water continuously to cool the fuel.
• To prevent the loss of the fuel cooling function, multiple and diversified
pumps and water sources are being secured.

Alternativecontainment
Spray pumps

Deployment of
14 portablewater pumpvehicles

Deployment of two
portable large-capacity
seawater water pumpvehicles28

Tomari Power Station Safety Measures (Education andTraining)• We provide education and training for maintenance staff and operators,
mainly in the form of practical skills, in an effort to develop humanresources that will contribute to maintaining and improving the safe andstable operation of power plants.

Training of maintenance personnel

Operator Training

29

Flow of Conformity Assessment of New Regulation Standards• Currently, priority is given to Unit 3, which is under review by the Nuclear Regulatory
Commission, mainly for an "application for a license to modify the establishment ofthe reactor.

※1 Basic design policy for countermeasures against major accidents and evaluation of effectiveness of thecountermeasures※2 Detailed design details of facilities and equipment required for countermeasures against severe accidents, etc., basedon the license for modification of the reactor installation.
(e.g., pump specifications and number of pumps)※3 System for countermeasures against major accidents, etc., and procedures for operationand management of facilities, etc.

30

Status of Conformity Assessment of New Regulatory Standards• The main items of examination are natural hazard assessment, such asearthquakes and tsunamis, and plant facility assessment.
• For the plant facilities, we will evaluate their impact based on thereference earthquake motion and the reference tsunami to be developedin the future.
• These explanations are to be implemented by April 2024.

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Table of Contents
1. Self-introduction
2. About Hokkaido Electric Power
Company
3. Reasons for Hokkaido ElectricPower to promote nuclear power
generation
4. Efforts to restart the Tomari Power
Station
5. Life in Tomari
6. To everyone

32

Nuclear power plants don't seemto have anything interesting todo in the countryside...

→There's something unique about
the countryside ︕︕

33

Tomari Power Station Geography

Otaru
YoichiTomari Power Plant

SapporoKutchan/Niseko

Highway extension under construction

Sapporo is within an hour!

34

Play with nature!
Skiing/Snowboarding Fishing Golf
Climbing Camping Hot Springs Sushi/
seafood ・・・・

35

Table of Contents
1. Self-introduction
2. About Hokkaido Electric PowerCompany
3. Reasons for Hokkaido ElectricPower to promote nuclear power
generation
4. Efforts to restart the Tomari Power
Station
5. Life in Tomari
6. To everyone

36

To all of you (I'm afraid this is a personal thought...)⚫ I am glad I chose a company in Hokkaido.

Good food, low cost of living, close to nature, cheap land (housing costs), cheap golfcourse nearby, cool summer, easy commute (close, no traffic), few typhoons, no rainyseasonLand (housing costs) is inexpensive, golf courses are nearby and inexpensive, I wasable to buy a house close to my parents' house, it is cool in summer, commuting iseasy (close, not crowded), there are few typhoons, and there is no rainy season.

In an even more pleasant miscalculation✓ Internet penetration has eliminated information delays✓ The "local handicap" of long ago, when you could get anything
on Amazon Prime with free shipping, is disappearing.

⚫ I am glad I chose Hokkaido Electric Power Co.

✓ Meet people with whom you want to stay connected even after retirement✓ A job that makes me feel "for Hokkaido✓ I was able to experience both study abroad and secondment
37⚫ On entering the workforce◆ One day at a time
Before you know it, you will be 50 years old in theblink of an eye.
Working life is much longer than student life. Academic
background is not meaningless, but the efforts you
make after entering the workforce are far more
important.
You can still grow a lot!
◆ Valuing Human Relationships
No matter how good you are, if you can't
communicate, you won't get the job done.
Interaction with people outside the company is a good
opportunity to check whether your common sense is
the same as the world's common sense.
38

Thank you for your attention.