ML081930580

Attachment 4: Presentation Slides, James Reilly, SONGS from June 11, 2008 Public Meeting with SONGS

ML081930580
Person / Time
Site:	San Onofre
Issue date:	06/11/2008
From:	Reilly J Southern California Edison Co
To:	NRC/FSME
Shepherd J
Shared Package
ML081930369	List: ML081930371 ML081930374 ML081930543 ML081930580
References
Download: ML081930580 (16)

Text

Release of San Onofre Unit 1 Offshore Conduits for Unrestricted Use James T. Reilly Vice President, E&TS Southern California Edison June 11, 2008 1

Purpose of License Amendment

• Remove the offshore conduits and leased property from Unit 1 License

• Return the leased property to the State of California

• Continue to protect the public health and safety and minimize impact on the environment.

2

San Onofre Nuclear Generating Station 3

San Onofre Nuclear Generating Station Unit 1 Unit 1 circa 1968 Unit 1 present day 4

Unit 1 Off Shore Conduits 5

SCE Plan for Off Shore Conduits

• Agree on final disposition of conduits with State Lands Commission

• Amend NRC license to exclude off-shore property

• Modify structures to final configuration

• Return the leased property to the State of California free of future restrictions 6

Amended Easement Lease SCE and State Lands Commission agreed on criteria for termination of lease in 2005 Environmental Impact Review identified the option with the least environmental impact

- Remove terminal structures

- Remove access manway risers

- Install safety barriers

- Allow conduits to naturally fill with sand 7

NRC License Amendment SCE must demonstrate that structures and property meet NRC criteria for unrestricted use Dose limits

- Dose is As Low As Reasonably Achievable

- Less than 25 millirem per year from all pathways Dose considerations

• maximally exposed hypothetical individual

• internal and external exposure pathways 8

Surveys and Samples Performed

• Onshore conduits surveyed in 2006

• Offshore conduits surveyed in 2007

• Conduit samples

- 46 Sediment samples -32 Scraping samples

- 17 Concrete samples -6 Swipe samples

• Marine species

- Lobster -Crab -Mussels

- Scallops -Sea Bass -Black Croaker 9

Dose Scenarios Considered

• Most Probable - recreational swimmer

• Maximally Exposed - diver inside conduit short time with average seafood and fish consumption

• Limiting Dose Scenario - diver inside conduit maximum probable time with average consumption of seafood and fish from conduit 10

Dose Assessment Results

• Maximum calculated dose in the Limiting Dose Scenario is one half of one millirem per year

• Less than 2% of the 25 millirem per year acceptance criteria

• SCE continues to protect the health and safety of the public with minimal impact on environment

• Projected dose meets NRC criteria for unrestricted use 11

Physical Modifications Once NRC approves license amendment:

• SCE will apply to Coastal Commission for a Coastal Development Permit

• SCE will modify conduits per the State Lands Commission amended easement lease

- Remove vertical structures

- Install safety barriers

- Dispose of debris at a licensed facility

- Allow conduits to naturally fill with sand 12

Final Configuration

• The Unit 1 conduits final configuration will meet the conditions of the State Lands Commission easement lease

• SCE will seek termination of the easement lease from the State Lands Commission 13

• The release of the offshore conduits and the leased property meets the NRC criteria for unrestricted use specified in Title 10 of the Code of Federal Regulations, Part 20, section 1402.

• This plan facilitates the return the offshore land to the State of California with the least environmental impact.

• The final configuration of the Unit 1 conduits ensures protection of public health and the environment.

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Conduit Plan and Profile Views 15

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