ML082280080

Additional Information Regarding Amendment Application Numbers 252 and 238, Proposed Change Number NPF-10/15-583, Replacement Steam Generators

ML082280080
Person / Time
Site:	San Onofre
Issue date:	08/13/2008
From:	Scherer A Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML082280080 (2)

Text

SOUTHERN CALIFORNIA A. Edward Scherer

~V1 EDISON0Director Nuclear Regulatory Affairs An EDISON INTERNATIONAL Company August 13, 2008 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Docket Nos. 50-361 and 50-362 Additional Information Regarding Amendment Application Numbers 252 and 238 Proposed Change Number NPF-10/15-583 Replacement Steam Generators San Onofre Nuclear Generating Station, Units 2 and 3

References:

Letter from J. T. Reilly (SCE) to Document Control Desk (NRC) dated June 27, 2008; Subject; Docket Nos. 50-361 and 50-362, Amendment Application Numbers 252 and 238, Proposed Change Number NPF-10/15-583, Replacement Steam Generators, San Onofre Nuclear Generating Station, Units 2 and 3

Dear Sir or Madam:

By letter dated June 27, 2008, (Referenced) Southern California Edison (SCE) submitted a License Amendment Request (LAR) for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 (operating licenses NPF-10 and NPF-15). The referenced letter was submitted pursuant to 10CFR50.90 to request revisions to Technical Specifications (TSs) 3.4.17, "Steam Generator (SG) Tube Integrity," 5.5.2.11, "Steam Generator (SG) Program," 5.5.2.15, "Containment Leakage Rate Testing Program," and 5.7.2.c, "Special Reports."

The referenced letter consisted of Proposed Change Number 583 (PCN-583) in support of the replacement of the steam generators at SONGS Units 2 and 3. The proposed changes reflected revised SG inspection and repair criteria and revised peak containment post-accident pressure resulting from installation of the Replacement Steam Generators (RSGs).

When PCN-583 was originally submitted, the calculation supporting the proposed RSG tube plugging criterion of 35% was still preliminary. The calculation is now complete.

SCE can now confirm the proposed RSG tube plugging criterion is 35%. The calculation result is consistent with the conservative selection of inputs and performance of the calculation. The calculation result will appropriately support tube integrity.

P.O. Box 128 San Clemente, CA 92674

Document Control Desk August 13, 2008 The No Significant Hazards Consideration provided in PCN-583 identified the proposed RSG tube plugging criterion of 35% as preliminary. With the exception of the fact that the RSG tube plugging criterion is final, there is no change to the No Significant Hazards Consideration contained in PCN-583. SCE has reviewed the No Significant Hazards Consideration from PCN-583 and determined that the conclusions remain valid.

There are no new commitments contained in this letter.

Should you have any questions, or require additional information, please contact Ms. Linda Conklin at (949) 368-9443.

Sincerely, cc: E. E. Collins, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, SONGS Units 2 and 3 G. G. Warnick, NRC Senior Resident Inspector, SONGS Units 2 and 3 S. Y. Hsu, California Department of Public Health, Radiologic Health Branch