ML060460040
| ML060460040 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/10/2006 |
| From: | Spina J Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML060460040 (6) | |
Text
James A. Spina Vice President Calvert Cliffs Nuclear Power Plant, Inc.
1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410.495.4455 410.495.3500 Fax Constellation Energy-Generation Group February 10, 2006 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit Nos. I & 2; Docket Nos. 50-317 & 50-318 ASME Section XI Relief Request Addendum To Specify Process Temperature Monitoring Techniques for Repair and Examination of Unacceptable Indications in Welded Nozzles
REFERENCES:
(a)
Letter from Mr. J. A. Spina (CCNPP) to Document Control Desk (NRC),
dated January 18, 2006, ASME Section XI Relief Request to Use Weld Overlay and Associated Alternative Techniques (b)
Letter from Ms. M. Gamberoni (NRC) to Mr. C. H. Cruse (BGE), dated April 5, 2000, Safety Evaluation of Proposed Alternate American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code)
Section XI, 1998 Edition for the Third 10-Year Inspection Interval -
Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 (TAC Nos.
MA4647 and MA4648)
Calvert Cliffs Nuclear Power Plant (CCNPP) requested relief in a letter dated January 18, 2006 (Reference a), pursuant to 10 CFR 50.55a(a)(3)(i), and proposed alternatives to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code) requirements concerning repair/replacement activities for pressure retaining welds subject to Article IWA-4000 in Section XI for the Third Ten-Year Inservice Inspection interval.
Based upon discussion with the U.S. Nuclear Regulatory Commission (NRC) staff on January 30, 2006, CCNPP amends the original relief request (Reference a) with the attached addendum.
Nuclear Regulatory Commission approved Code Cases N-504-2 and N-638-1 contain the requirements for structural weld overlay repair activities and temperbead welding technique. The ASME approved Code Cases N-504-2 and N-638-1 are listed as acceptable for use in NRC Regulatory Guide 1.147, Revision 14, with conditions. Calvert Cliffs Nuclear Power Plant requested relief (Reference a) from specific requirements on January 18, 2006. Although these Code Cases do not specify the method used to monitor process temperatures, ASME Code Section XI, Article 4000 contains requirements which, if employed at CCNPP, would impose a hardship without real benefit.
Abut4
tow Document Control Desk February 10, 2006 Page 2 In lieu of weld-attached thermocouples and recording instruments as required under ASME Code Section XI IWA-46 10(a), we propose to monitor the process temperatures with contact pyrometer(s) and provide a manual record of the process temperatures.
Details of this request are provided in Attachment (1).
SCHEDULE The structural weld overlay is intended as a contingency repair for any flaws identified during examination of dissimilar metal welds in the upcoming Calvert Cliffs Unit 1 Spring 2006 refueling outage (scheduled to begin in late February 2006) and the remainder of the third ten-year inservice inspection interval for Units 1 and 2.
We request that the NRC review and approve our proposed alternative for use during this outage and subsequent third interval outages.
Should you have questions regarding this matter, please contact Mr. L. S. Larragoite at (410) 495-4922.
Very truly yours, JAS/MJY/bjd
Attachment:
(1)
Relief Request Addendum To Specify Process Temperature Monitoring Techniques for Repair and Examination of Unacceptable Indications in Welded Nozzles cc:
P. D. Milano, NRC S. J. Collins, NRC Resident Inspector, NRC R. I. McLean, DNR
ATTACHMENT (1)
RELIEF REQUEST ADDENDUM TO SPECIFY PROCESS TEMPERATURE MONITORING TECHNIQUES FOR REPAIR AND EXAMINATION OF UNACCEPTABLE INDICATIONS IN WELDED NOZZLES Calvert Cliffs Nuclear Power Plant, Inc.
February 10, 2006
I/
ATTACHMENT (1)
RELIEF REQUEST ADDENDUM TO SPECIFY PROCESS TEMPERATURE MONITORING TECHNIQUES FOR REPAIR AND EXAMINATION OF UNACCEPTABLE INDICATIONS IN WELDED NOZZLES COMPONENTS FOR WHICH RELIEF IS REOUESTED:
Class 1 dissimilar metal welds, with unacceptable indications attributed to primary water stress corrosion cracking (PWSCC) in existing Alloy 82/182 welds. These welds may include:
UNIT 1 DM WELD POPULATION Weld Nozzle Designator/ID Material SiZ Location Function Base Material 102300/30-RC-1lA-W7 182/82 30" 1 lA RCP Inlet RCS Loop A516-70/A351-CF8M 102450/30-RC-1lA-W1O 182/82 30" 1 lA RCP Outlet RCS Loop A516-70/A351-CF8M 104550/30-RC-1lB-W7 182/82 30" 11B RCP Inlet RCS Loop A516-70/A351-CF8M 104700/30-RC-1 lB-W10 182/82 30" 1 lB RCP Outlet RCS Loop A516-70/A351-CF8M 107450/30-RC-12A-W7 182/82 30" 12A RCP Inlet RCS Loop A516-70/A351-CF8M 107600/30-RC-12A-WIO 182/82 30" 12A RCP Outlet RCS Loop A516-70/A351-CF8M 109600/30-RC-12B-W7 182/82 30" 12B RCP Inlet RCS Loop A5 16-70/A35 1-CF8M 109750/30-RC-12B-W1O 182/82 30" 12B RCP Outlet RCS Loop A516-70/A351 -CF8M 110450/12-PSL-W1 182/82 12" Bottom Head of PZR PZR Surge SA508-C12/ SA351-CF8M 111100/12-PSL-W13 182/82 12" Top of 11 Hot Leg PZR Surge A105-GrII/ A351-CF8M 113150/12-SC-1004-W1 182/82 12" Bottom of 12 Hot Leg Shutdown Cooling A105-GrIII/A351-CF8M 114350/12-SI-1009-W16 182/82 12" Top of 1 lA Cold Leg Safety Injection A182-F-I/ A351-CF8M 115200/12-SI-1010-W14 182/82 12" Top of 1 lB Cold Leg Safety Injection A182-F-1/ A351-CF8M 116000/12-SI-111 -W13 182/82 12" Top of 12A Cold Leg Safety Injection A182-F-1/ A351-CF8M 116750/12-SI-1012-W13 182/82 12" Top of 12B Cold Leg Safety Injection A182-F-I/ A351-CF8M 118500/4-PS-1003-W6 182/82 4"
Top Head of PZR PZR Spray SA508-C12/SA-1 82-F316 118550/3-PS-1001-W I 182/82 3"9 Top of 1 lA Cold Leg PZR Spray A105-GrII/A-l 82-TP316 120350/3-PS-1002-W1 182/82 3"
Top of lI B Cold Leg PZR Spray.
A105-GrII/A-182-TP316 123100/4-SR-1005-W1 182/82 4"
Top of PZR PZR Relief SA508-C12/SA-182-F316 123450/4-SR-1006-WI 182/82 4"
Top of PZR PZR Relief SA508-C12/SA-182-F316 125050/2-LD-1004-W1 182/82 2"
Bottom of 12A Cold Leg Letdown/Drain A105-GrII/A-182-TP316 128900/2-CV-1004-W19 182/82 2"
12B Cold Leg Charging Inlet A105-GrII/A-1 82-TP316 130450/2-CV-1005-W29 182/82 2"
1 lA Cold Leg Charging Inlet A105-GrII/A-182-TP316 131200/2-DR-1003-W1 182/82 2"
Bottom of 1 lA Cold Leg Loop Drain A105-Grll/A-1 82-TP316 131500/2-DR-1004-W1 182/82 2"
Bottom of l lB Cold Leg Loop Drain A105-GrII/A-182-TP316 132150/2-DR-1006-W1 182/82 2"
Bottom of 12B Cold Leg Loop Drain A105-GrII/A-182-TP316 1
ATTACHMENT (1)
RELIEF REQUEST ADDENDUM TO SPECIFY PROCESS TEMPERATURE MONITORING TECHNIQUES FOR REPAIR AND EXAMINATION OF UNACCEPTABLE INDICATIONS IN WELDED NOZZLES UNIT 2 DM WELD POPULATION Designator/ID Weld Nozzle Location Function Base Material Material Size 109280/30-RC-21A-W7 182/82 30" 21A RCP Inlet RCS Loop A516-70/A351-CF8M 109310/30-RC-21A-W10 182/82 30" 21A RCP Outlet RCS Loop A516-70/A351-CF8M 110280/30-RC-21B-W7 182/82 30" 21B RCP Inlet RCS Loop A516-70/A351-CF8M 110310/30-RC-21B-W1O 182/82 30" 21B RCP Outlet RCS Loop A516-70/A351-CF8M 11 1280/30-RC-22A-W7 182/82 30" 22A RCP Inlet RCS Loop A516-70/A351-CF8M 111310/30-RC-22A-W1O 182/82 30" 22A RCP Outlet RCS Loop A516-70/A351-CF8M 112280/30-RC-22B-W7 182/82 30" 22B RCP Inlet RCS Loop A516-70/A351-CF8M 112310/30-RC-22B-W1O 182/82 30" 22B RCP Outlet RCS Loop A516-70/A351-CF8M 113010/12-PSL-W1 182/82 12" Bottom Head of PZR PZR Surge SA508-C12/ SA351-CF8M 113130/12-PSL-W13 182/82 12" Top of 21 Hot Leg PZR Surge A105-GrII/A351-CF8M 114900/12-SC-2004-W1 182/82 12" Bottom of 22 Hot Leg Shutdown Cooling A105-GrIlI A351-CF8M 115140/12-SI-2009-W15 182/82 12" Top of 21B Cold Leg Safety Injection A182-F-1/ A351-CF8M 1 16190/12-SI-2010-W13 182/82 12" Top of 21A Cold Leg Safety Injection A182-F-11 A351-CF8M 117120/12-SI-201 1-W 13 182/82 12" Top of 22B Cold Leg Safety Injection A182-F-1/ A351-CF8M 118120/12-SI-2012-W13 182/82 12" Top of 22A Cold Leg Safety Injection A182-F-1/ A351-CF8M 136090/4-PS-2003-W8 182/82 4"
Top Head of PZR PZR Spray SA508-C12/SA-182-F316 137010/3-PS-2001-W1 182/82 3"
Top of 21A Cold Leg PZR Spray A105-Grll/A-182-TP316 138010/3-PS-2002-W1 182/82 3"
Top of 21B Cold Leg PZR Spray A105-GrII/A-182-TP316 141000/4-SR-2005-W1 182/82 4"
Top of PZR PZR Relief SA508-C12/SA-182-F316 142000/4-SR-2006-W1 182/82 4",
Top of PZR PZR Relief SA508-C12/SA-182-F316 152440/2-CV-2005-W30 182/82 2"
21A Cold Leg Charging Inlet A105-GrII/A-182-TP316 156530/2-CV-2021-W34 182/82 2"
22B Cold Leg Charging Inlet A105-GrII/A-182-TP316 157010/2-DR-2003-W1 182/82 2"
Bottom of 21A Cold Leg Loop Drain A105-Grll/A-182-TP316 158010/2-DR-2004-W1 182/82 2"
Bottom of 21B Cold Leg Loop Drain A105-GrII/A-182-TP316 160010/2-DR-2006-W1 182/82 2"
Bottom of 22B Cold Leg Loop Drain A105-GrII/A-182-TP316 2
ATTACHMENT (1)
RELIEF REQUEST ADDENDUM TO SPECIFY PROCESS TEMPERATURE MONITORING TECHNIQUES FOR REPAIR AND EXAMINATION OF UNACCEPTABLE INDICATIONS IN WELDED NOZZLES CODE REQUIREMENTS FOR WHICH RELIEF IS REQUESTED The 1998 Edition, no Addenda, of American Society of Mechanical Engineers (ASME)Section XI, Article IWA-4000. The Third Ten-Year Inservice Inspection Program Plan for Calvert Cliffs Units 1 and 2 meets the requirements of the 1998 Edition, no Addenda, of Section XI of the ASME Code (except for Subsections IWE and IWL), as approved by NRC letter (Reference b).
PROPOSED ALTERNATIVE AND SUPPORTING INFORMATION American Society of Mechanical Engineers Code Section XI, IWA-4610(a) states, "Thermocouples and recording instruments shall be used to monitor the process temperatures. Their attachment and removal shall be in accordance with Section in."
In lieu of weld-attached thermocouples and recording instruments as required under ASME Code Section XI IWA-4610(a), Calvert Cliffs Nuclear Power Plant proposes to monitor the process temperatures with contact pyrometers and provide a manual record of the process temperatures. This method will provide an acceptable alternative because the calibrated contact pyrometers will provide an accurate record while reducing the radiation exposure necessary to install, remove, and perform non-destructive examinations on the welded areas.
CONCLUSION Calvert Cliffs believes the proposed alternative to ASME Code Section XI, IWA-4610(a), as described in this request, provides an acceptable level of quality and safety.
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