NL-07-1317, Response to Confirmatory Action Letter Regarding Pressurizer Nozzle Alloy 82/182 Butt Welds

Response to Confirmatory Action Letter Regarding Pressurizer Nozzle Alloy 82/182 Butt Welds

ML071990250
Person / Time
Site:	Farley
Issue date:	07/18/2007
From:	George B Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-07-1317
Download: ML071990250 (2)

Text

Southern Nuclear Operating Company, Inc.

Post Office Box 1295 Birmingham, Alabama 35201-1 295 Tel 205.992.5000 July 18, 2007 COMPANY Energy to Serve Your WorldsM Docket No.: 50-364 U. S. Nuclear Regulatory Commission AlTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant Unit 2 Response to Confirmatory Action Letter Reqardinn Pressurizer Nozzle Allov 821182 Butt Welds Ladies and Gentlemen:

On March 12,2007, Southern Nuclear Operating Company (SNC) received NRC Confirmatory Action Letter (CAL) No. NRR-07-018 regarding commitments made by SNC letter dated March 6, 2007, associated with the Alloy 821182 butt welds in the pressurizer at Farley Nuclear Plant (FNP) Units 1 and 2. The SNC letter described actions that would be taken by FNP for the pressurizer dissimilar metal butt welds containing Alloy 821182 material. These commitments addressed:

1) completion schedules for inspectionlmitigation of the welds; 2) RCS leak monitoring frequency, action levels, and actions; 3) reporting requirements; and

4) reinspection frequencies.

During the Spring 2007 Unit 2 outage 2R18, all six pressurizer dissimilar metal butt welds containing Alloy 821182 material were examined to meet MRP-139 volumetric examination requirements. Five of these welds were examined with no recordable indications noted. Bare metal visual (BMV) examinations were not performed during the 2R18 outage based on the MRP-139 requirement that a BMV is not required in an outage when a volumetric examination is performed.

The remaining dissimilar metal butt weld associated with the surge nozzle had ultrasonic indications which necessitated the application of a full structural weld overlay (FSWOL). On May 9, 2007, SNC submitted a letter to the NRC providing examination results for the surge nozzle FSWOL and a discussion of repairs to the overlay material andlor base metal. The May 9, 2007 submittal and this letter satisfy the 60-day reporting requirements committed to by SNC letter dated March 6, 2007.

U. S. Nuclear Regulatory Commission NL-07-1317 Page 2 This letter contains no NRC commitments. If you have any questions, please advise.

Sincerely, Manager, Nuclear Licensing cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. J. R. Johnson, Vice President - Farley Mr. D. H. Jones, Vice President - Engineering RTYPE: CFA04.054; LC# 14604 U. S. Nuclear Reclulatorv Commission Dr. W. D. Travers, Regional Administrator Ms. K. R. Cotton, NRR Project Manager - Farley Mr. E. L. Crowe, Senior Resident Inspector - Farley