ULNRC-05424, Results of Inspections Performed for Pressurizer Full Structural Weld Overlays Installed at Callaway Plant

Results of Inspections Performed for Pressurizer Full Structural Weld Overlays Installed at Callaway Plant

ML071980376
Person / Time
Site:	Callaway
Issue date:	07/09/2007
From:	Graessle L Ameren Corp, AmerenUE
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-05424
Download: ML071980376 (4)

Text

AmerenUE PO Box 620 Callaway Plant Fulton, MO 65251 July 9, 2007 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 Ladies and Gentlemen: ULNRC-05424 DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

WAmerein RESULTS OF INSPECTIONS PERFORMED FOR PRESSURIZER FULL STRUCTURAL WELD OVERLAYS UE INSTALLED AT CALLAWAY PLANT Reference 1: AmerenUE letter ULNRC-05373, "Actions for Addressing Concerns Regarding Pressurizer Alloy 82/182 Butt Welds,"

dated February 28, 2007.

Reference 2: AmerenUE letter ULNRC-05413, "Results of Ultrasonic Examinations of Full Structural Weld Overlays on the Pressurizer Nozzle Welds," dated May 4, 2007.

Reference 3: AmerenUE letter ULNRC-05385, "Response to Request for Additional Information Regarding 10 CFR 50.55a Request for Relief from ASME Section XI Repair and Replacement Requirements: Proposed Alternatives for Application of Structural Weld Overlays to Pressurizer Nozzle Welds,"

dated March 26, 2007.

By letter dated February 28, 2007 (Reference 1), AmerenUE (Union Electric) committed to submit results of the follow-up inspections to be performed for the weld overlays that were installed on the pressurizer nozzles at the Callaway plant during Refuel 15. Specifically, AmerenUE committed to provide a report of the inspection results within 60 days following restart from Refuel 15. Refuel 15 was subsequently concluded at the Callaway plant on May 10, 2007 when the main generator was synchronized to the grid.

AmerenUE hereby reports that appropriate inspections, performed in accordance with the qualification requirements of the industry's Performance Demonstration Initiative (PDI), were performed on the pressurizer weld overlays following their installation during Refuel 15. Based upon the PDI-qualified ultrasonic examinations, there were no recordable indications in the overlay welds, XOY 7 a subsidiary of Ameren Corporation K(Wg

ULNRC-05424 July 9, 2007 Page 2 of 4 including the outer 1/4 of the association dissimilar metal welds (pressurizer to safe end) and the adjoining stainless steel welds (safe end to stainless steel pipe).

These results were also reported in AmerenUE's letter dated May 4, 2007 (Reference 2) which was submitted in accordance with a commitment made by AmerenUE in its letter dated March 26, 2007 (Reference 3). Upon submittal of this letter, no further action or correspondence is required in connection with the pressurizer weld overlays installed at Callaway. No new or additional regulatory commitments are made in this letter.

For any additional questions regarding this matter, please contact me at 573-676-8129 or Scott A. Maglio at 573-676-8719.

Sincerely, Luke H. Graessle Manager - Regulatory Affairs MGH/TBE/slk

ULNRC-05424 July 9, 2007 Page 3 of 4 cc: Mr. Bruce S. Mallett Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)

Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O-7D1 Washington, DC 20555-2738 Missouri Public Service Commission Governor Office Building 200 Madison Street PO Box 360 Jefferson City, MO 65102-0360

ULNRC-05424 July 9, 2007 Page 4 of 4 bcc: C. D. Naslund A. C. Heflin L. H. Graessle G. A. Hughes S. A. Maglio S. L. Gallagher (100)

L. M. Belsky (NSRB)

T. B. Elwood A160.0761 Certrec Corporation 4200 South Hulen, Suite 422 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Send to the following without attachments:

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