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Enhanced Safety Measures at Hamaoka Nuclear Power Station Unit 4(conceptual image)

July 29,2016 Chubu Electric Power Co.,Inc

Major works planned after the Fukushima Daiichi Nuclear Power Station accident as measures to enhance the safety of Unit 4 are expected to be completed by around September 2016. The efforts will accordingly bolster key functions concerning steps for higher safety (e.g. electric power supply, water injection, heat sink). Meanwhile, in light of field condition- or review-based work detail revisions and design changes, respectively, some of the works are to be continued from September and onwards. New knowledge and developments from conformability reviews might result in the need to rearrange or add works. We will accordingly announce the timing in which enhanced safety measure works will complete, after the review practically comes to an end and we gain an outlook for the works.

Pre-

service inspection

Review of

application concerning work plan approval

Review of compliance with new regulatory requirements

○Extending Emergency Response Center

○Pipe support work (Partial)

○Countermeasures for internal fire ○Boosting battery capacity

○Locating light oil tanks underground

○Pipe support work

ⒻGas turbine generator

Ensuring cooling functions

ⒿMobile water intake pumper

ⓀEmergency seawater intake system

Seismic resistance:

Geological features around the station site, i.e. preconditions for standard seismic motion and design basis tsunami reviews, have been reviewed in advance in terms of earthquakes and tsunamis.

Equipment: Reviews concerning design basis and severe accident measures are currently underway, together

with boiling water reactor operators.

ⒸTsunami protection wall

ⒺLarge equipment access way (Tsunami protection door)

Safety Enh

ancem

ent M

easures

(Note) Works might require rearrangements and additions based on new knowledge and developments on the review.

Works conducted in step with pre-service inspections

Review

of

com

plian

ce

Major works completing around September 2016

2016年9月頃までに終了する主な工事

○Extending Emergency

Response Center

Works reviewed in light of field conditions or continued on account of review details

Works continuing after September 2016

ⒹOverflow prevention wall

Earthquake countermeasure work

Ⓐ Water intake pond foundation

improvement

ⒷOn-site slope reinforcement

Tsunami countermeasure work

ⒸTsunami protection wall/Cement-mixed

soil embankment for east and west site areas

ⒹOverflow prevention wall

ⒺLarge equipment hatch

(Tsunami protection door)

Power supply measure work

ⒻGas turbine generator

ⒼPower truck

Water injection measure work

ⒽEmergency fresh water storage tank

ⒾMobile water injection pumper

ⒿMobile water intake pumper

Heat sink measure work

ⓀEmergency seawater intake system

ⓁFilter vent equipment

ⓂAlternative heat exchanger vehicle

Other countermeasure works

・Mobile equipment storage area/Access

route

・Measures for protection against missiles

ⒶWater intake pond foundation improvement

（Gas turbine generator

building standing on the high ground）

（Gas turbine generator）

Withstanding large-scale earthquakes

Preventing inflow of tsunami

Enh

anced

Safety Measu

res