ML063280023

Additional Information Supporting the Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-24 for the Use of Structural Weld Overlay and Associated Alternative Repair Techniques

ML063280023
Person / Time
Site:	San Onofre
Issue date:	11/20/2006
From:	Pressey L Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML063280023 (3)

Text

SOUTHERN CALIFORNIA A. Edward Scherer Manager of EDISON Nuclear Regulatory Affairs An EDISON INTERNATIONAL Company November 20, 2006 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

Docket No. 50-362 Additional Information Supporting the Third Ten-Year Inservice Inspection (ISl) Interval Relief Request ISI-3-24 for the Use of Structural Weld Overlay and Associated Alternative Repair Techniques San Onofre Nuclear Generating Station, Unit 3

References:

1) Letter from A. E. Scherer to the U. S. Nuclear Regulatory Commission dated June 30, 2006;

Subject:

Docket No. 50-362, Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-24, Use of Structural Weld Overlay and Associated Alternative Repair Techniques, San Onofre Nuclear Generating Station, Unit 3

2) Letter from A. E. Scherer to the U. S. Nuclear Regulatory Commission dated October 23, 2006;

Subject:

Docket Nos. 50-361 and 50-362, Additional Information Supporting the Third Ten-Year Inservice Inspection (ISI) Interval Relief Requests ISI-3-24 and ISI-3-25 for the Use of Structural Weld Overlay and Associated Alternative Repair Techniques, San Onofre Nuclear Generating Station, Units 2 and 3

Dear Sir or Madam:

The Reference I submittal proposed an alternative (ISI-3-24), in accordance with 10 CFR 50.55a(a)(3)(i), to the repair/replacement requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code),

Section XI, 1995 Edition, through 1996 Addenda, IWA-4000, for the structural weld overlays on the San Onofre Nuclear Generating Station Unit 3 pressurizer spray and three pressurizer safety nozzle safe-ends.

P.O. Box 128 San Clemente, CA 92672 949-368-7501

-AD47 Fax 949-368-7575

Document Control Desk November 20, 2006 The Reference 2 submittal provided additional information in support of the proposed alternative and commitment to provide a report that summarizes the results of the final ultrasonic (UT) examination within fourteen days of completion of the final UT examination of the structural weld overlays on the San Onofre Nuclear Generating Station Unit 3 pressurizer spray and three pressurizer safety nozzle safe-ends to the NRC.

In accordance with the Reference 2 commitment, Southern California Edison (SCE) is providing the summary of UT results of the structural weld overlays on the San Onofre Nuclear Generating Station Unit 3 pressurizer spray and three pressurizer safety nozzle safe-ends.

After completing the full structural weld overlay on the Unit 3 pressurizer spray and three pressurizer safety nozzle safe-ends SCE performed the required UT examination.

The UT examination was completed on November 15, 2006, with the following results.

1. Pressurizer S31201 ME087 spray nozzle to safe end HSS dissimilar metal weld (ISI Designation Number 03-005-030) - No suspected flaw indications, such as lack of bond, weld flaws, planar flaws, or laminar flaws, were observed during the examinations

2. Pressurizer S31201 ME087 safety nozzle to safe end HSS dissimilar metal weld (ISI Designation Number 03-005-027) - No suspected flaw indications, such as lack of bond, weld flaws, planar flaws, or laminar flaws, were observed during the examinations

3. Pressurizer S31201 ME087 safety nozzle to safe end HSS dissimilar metal weld (ISI Designation Number 03-005-028) - No suspected flaw indications, such as lack of bond, weld flaws, planar flaws, or laminar flaws, were observed during the examinations

4. Pressurizer 531201 ME087 safety nozzle to safe end HSS dissimilar metal weld (ISI Designation Number 03-005-029) - No suspected flaw indications, such as lack of bond, weld flaws, planar flaws, or laminar flaws, were observed during the examinations Should you have any questions, please contact Ms. Lynn Pressey at 949-368-6351.

Document Control Desk November 20, 2006 cc: B. S. Malleft, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3