CP-200800609, Pressurizer Weld Overlay 60 Day Report and Results of the Final Pdi/Ut Examination of Weld Overlays

Pressurizer Weld Overlay 60 Day Report and Results of the Final Pdi/Ut Examination of Weld Overlays

ML081230057
Person / Time
Site:	Comanche Peak
Issue date:	04/24/2008
From:	Blevins M, Madden F Luminant Generation Co, Luminant Power
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CP-200800609, TXX-08055
Download: ML081230057 (6)

Text

Mike Blevins Luminant Power Executive Vice President P 0 Box 1002 Luminant & Chief Nuclear Officer Mike.Blevins@Luminant.com 6322 North FM 56 Glen Rose, TX 76043 T 254 897 5209 C 817 559 9085 F 254 897 6652 CP-200800609 Ref. # 10CFR50.55a Log # TXX-08055 April 24, 2008 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NO. 50-446 UNIT 2 PRESSURIZER WELD OVERLAY 60 DAY REPORT AND RESULTS OF THE FINAL PDI/UT EXAMINATION OF WELD OVERLAYS

REFERENCES:

1. Letter logged TXX-07013, "Inspection and Mitigation of Alloy 82/182 Pressurizer Butt Welds"' dated January 30, 2007 from Mike Blevins to the NRC.

2. Letter logged TXX-07095, "Relief Request B-4 to the Unit 2 Inservice Inspection Program Plan - Unit 2 Pressurizer Weld Overlay," dated August 22, 2007 from Mike Blevins to the NRC.

Dear Sir or Madam:

By means of Reference 1, Luminant Generation Company LLC (Luminant Power) committed to submit a report with the results of future inspections or mitigation of Pressurizer Alloy 82/182 butt weld locations within 60 days of startup from the outage during which they were performed.

By means of Reference 2, Luminant Power committed to submit a report summarizing the results of the final PDI/UT examination of weld overlays within 14 days following completion of ultrasonic (UT) examinations of the pressurizer weld overlays performed on Unit 2. Luminant Power completed the UT examination of 'the Unit 2 pressurizer weld overlays on April 13, 2008.

All nozzle connected piping systems were found to beadequate and structurally acceptable using an estimated weld shrinkage value of 0.35 inches. Since actual shrinkage values for all nozzles were less than the estimated value, the analysis performed to verify structural integrity is bounding and actual weld shrinkage experienced has no adverse impact on all pressurizer nozzle connected piping systems.

Pressurizer Alloy 82/182 butt weld structural weld overlay was completed for Unit 2 during refueling outage 2RF1O which ended April 19, 2008. Please find enclosed the final PDI/UT report for the pressurizer structural weld overlays performed at Comanche Peak Unit 2. No further action is required for Comanche Peak Unit 2 Pressurizer Alloy 82/182 butt welds.

A member of the STARS (Strategic Teaming and Resource Sharing) Alliance /AJi Callaway

• Comanche Peak

• Diablo Canyon

• Palo Verde

• South Texas Project

• Wolf Creek

U. S. Nuclear Regulatory Commission TXX-08055 Page 2 04/24/2008 This communication contains no new licensing basis commitments regarding Comanche Peak Unit 2.

Should you have any questions, please contact Mr. Jack C. Hicks at (254) 897-6725.

Sincerely, Luminant Generation Company LLC Mike Blevins By: -

red W. Madden Director, Oversight & Regulatory Affairs Enclosure - Comanche Peak Nuclear Power Plant Unit 2 Weld Overlay Examination c- E. E. Collins, Region IV B. K. Singal, NRR Resident Inspectors, Comanche Peak

Enclosure to TXX-08055 Comanche Peak Nuclear Power Plant Unit 2 Weld Overlay Examination

Comanche Peak Nuclear Power Pla nt Unit 2 Weld Overlay Examination For Luminant Power Corporation Prepared by:

- WESDfynE A Westinghouse NDE Company Outage 2R10 2008 1

P.O. Box 409 Madison, PA 15663 Bus. 724.722.5250

~WEsDynfE FAX 724.722.5830/5840 I NTE RN ATI ON AL Summary In support of the Structural Weld Overlay project during RFO 2R10 at Comanche Peak Unit 2, WesDyne performed the PDI exams of six pressurizer nozzles. This report documents the results of the NDE inspections performed by WesDyne in support of that project.

Table 1, "Indications for Pressurizer Weld Overlays", provides detailed results of the final PDI UT inspections performed on the six pressurizer nozzles. There were no recordable indications.

Table 1. Indications for Pressurizer Weld Overlays.

Nozzle Weld Identifications Number of Indication Assessment (DM/SS/OL) Indications Final Summary/Comments PDI Inspection Safety Nozzle "A" TCX-1-4501-1 No Recordable N/A TCX-1-4501-2 Indications TCX- 1-4501-OL-02 Safety Nozzle "B" TCX-1-4502-1 No Recordable N/A TCX- 1-4502-2 Indications TCX- 1-4502-OL-02 Safety Nozzle "C" TCX-1-4503-1 No Recordable N/A TCX- 1-4503-2 Indications TCX- 1-4503-OL-02 Relief Nozzle TCX-1-4504-1 No Recordable N/A TCX- 1-4504-2 Indications TCX- 1-4504-OL-02 Spray Nozzle TCX-1-4506-22 No Recordable N/A TCX- 1-4506-21 Indications TCX- 1-4506-OL-02 Surge Nozzle TCX-1-4500-6 No Recordable N/A TCX- 1-4500-5 Indications TCX- 1-4500-OL-02 2

P.O. Box 409 Madison, PA 15663 nWERNSAyn IN TE R NAT 1NAL A Bus. 724.722.5250 FAX 724.722.5830/5840 Coverage A summary of the volumetric exam coverage is shown in Table 2 for all six nozzles.

Table 2 Coverage Summary for Pressurizer Weld Overlay, DM Weld Volume, and SS Weld Volume.

Safety "A" Safety "B" Safety "C" IRelief Nozzle Spray Nozzle Surge Nozzle S S I I S Weld Overlay Volume 0 degree Beam 97.5% 98.7% 99.3% 98.1% 98.2% 98.0%

Circ Beams 94.2% 92.4% 93.8% 92.3% 93.2% 91.1%

Axial Beams 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

DM Weld Volume Axial Beams 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

Circ Beams 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

SS Weld Volume Axial Beams 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

Circ Beams 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

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