Press Release Back Number(2006)

Attachment 2 : Overview of Hamaoka Nuclear Power Station Reactor No. 5 Seismic Safety Margin Improvement Project (Diagram)

November 21, 2006
Chubu Electric Power Co., Inc.

Piping support modification

Existing supports will be modified and new supports added to improve the seismic safety margin of piping (parts colored green in diagram).



Electric circuit support modification

Existing supports will be modified and new supports added for cable trays and power line conduits in order to improve the seismic safety margin of electric circuits (parts colored green in diagram).



Fuel exchanger rail guide modification

Rail guides (parts circled in red) will be added to increase seismic safety margin by preventing fuel exchanger from derailing.



Modification of ceiling crane support components in reactor building

Ceiling crane support components (parts circled in red) will be modified to increase seismic safety margin by preventing crane from falling.



Oil tank modification

Oil tanks will be modified to lower oil level and connect two tanks by pipe so they can borrow oil from each other to increase seismic safety margin by preventing sloshing (oil surface vibration).



Improvement of the ground around pipes and ducts

Ground around pipes and ducts will be dug up and replaced with concrete (replacement technique). Or, holes will be drilled in the ground and a cement-based material injected to mix with the surrounding soil (churning technique).



Modification of exhaust pipes

Support towers will be installed so that existing exhaust pipes will be enclosed.