ML103130472
| ML103130472 | |
| Person / Time | |
|---|---|
| Site: | Kewaunee  |
| Issue date: | 11/09/2010 |
| From: | Price J Dominion Energy Kewaunee |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 10-665 | |
| Download: ML103130472 (6) | |
Text
Do minion Energy Kewau nee , Inc.
5000 Dom inion Boulevard, G len Allen, VA 23060 Dominion November 9, 2010 United States Nuclear Regulatory Commission Serial No.: 10-665 Attention: Document Control Desk LR/MWH RO Washington, DC 20555-0001 Docket No.: 50-305 License No.: DPR-43 DOMINION ENERGY KEWAUNEE, INC.
KEWAUNEE POWER STATION SUPPLEMENTAL INFORMATION FOR THE REVIEW OF THE KEWAUNEE POWER STATION LICENSE RENEWAL APPLICATION During a telephone conference held on Thursday, November 5, 2010, members of the NRC and Dominion Energy Kewaunee, Inc. (DEK) staffs discussed the license renewal commitment 43 to inspect ASME Class 1 small-bore piping socket welds in support the Kewaunee Power Station (KPS) license renewal application (LRA) (reference 1). As a result of the conference call, DEK is supplementing its response to RAI 82.1.2-2, which was submitted to the NRC in Reference 2. Attachment 1 to this letter provides the supplemental response to RAI 82.1.2-2.
Should you have any questions regarding this submittal, please contact Mr. Paul C.
Aitken at (804) 273-2818.
Very truly yours, J.
Vi COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and State aforesaid, today by J. Alan Price, who is Vice President - Nuclear Engineering of Dominion Energy Kewaunee, Inc. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this c,-WL day of N O"{ r(\.~ , 2010.
My Commission Expires: _----'--'----'---=- _
~ \.:d o\'U+/-fC otary Public
.-. .-. --- --- -- -- -- -- -- --
GINGER LYNN MELTON
.- -- :r VJo..~ COYY\rY\I'~'5")(Y\..O d-l cs,\\"G,{\Y>f ro+o.v'j Q:b etl~ . ~ U - -"" ' -
Notary Public Commonwealth of Virginia 310847 My Commlilion expires Apr 30. 2013
Serial No.10-665 Docket No. 50-305 Page 2 of 3
Attachment:
- 1. Supplemental Response to RAI 82.1 .2-2 References :
- 1. Letter from D. A. Christian (DEK) to NRC, "Kewaunee Power Station Application for Renewed Operating License," dated August 12, 2008 . [ADAMS Accession No.
ML082341020]
- 2. Letter from L. N. Hartz (DEK) to NRC, "Response to Request for Additional Information for the Review of the Kewaunee Power Station License Renewal Application," dated September 23,2010. [ADAMS Accession No. ML102700162]
Commitments made in this letter:
- 1. License Renewal Commitment 43 will be revised consistent with the supplemental response to RAI 82.1.2-2. The revised commitment is proposed to support approval of the renewed operating license , and may change during the NRC review period .
Serial No.10-665 Docket No. 50-305 Page 3 of 3 cc: U.S. Nuclear Regulatory Commission Regional Administrator, Region III 2443 Warrenville Road Suite 210 Lisle, IL 60532-4532 Mr. K. D. Feintuch, Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint , Mail Stop 08-H4A 11555 Rockville Pike Rockville, MD 20852-2738 Mr. Daniel Doyle Environmental Project Manager U.S. Nuclear Regulatory Commission .
Mail Stop 0-11 F1 Washington , DC 20555-0001 Mr. John Daily License Renewal Project Manager U.S. Nuclear Regulatory Commission Mail Stop 0-11 F1 Washington , DC 20555-0001 NRC Senior Resident Inspector Kewaunee Power Station N490 Highway 42 Kewaunee, WI 54216 Public Service Commission of Wisconsin Electric Division P.O. Box 7854 Madison, WI 53707 David Hardtke Chairman - Town of Carlton E2334 Lakeshore Road Kewaunee, WI 54216
Serial No.10-665 Docket No. 50-305 ATTACHMENT 1 SUPPLEMENTAL RESPONSE TO RAI 82.1.2-2 KEWAUNEE POWER STATION DOMINION ENERGY KEWAUNEE, INC.
Serial No.10-665 Docket No. 50-305 Attachment 1/Page 1 of 2 Supplemental Response to RAI 82.1 .2-2 During a telephone conference held on Thursday, November 5, 2010, members of the NRC and Dominion Energy Kewaunee , Inc. (DEK) staffs discussed the Kewaunee license renewal commitment 43 to inspect ASME Class 1 small-bore piping socket welds. The NRC staff indicated that a position on appropriate sample size for Class 1 small-bore piping welds had been established and will be included in NUREG-1801 ,
Revision 2, Generic Aging Lessons Learned (GALL) Report,Section XI.M35. The stated NRC staff position is as follows:
If an applicant has never experienced a failure (a through-wall crack detected in the subject component by evidence of leakage, or through nondestructive or destructive examination) in its Class 1 small bore piping and has extensive operating history (more than 30 years of operation at time of submitting the application) , the inspection sample size may be as low as 3% of the weld population or a maximum of 10 welds of each weld type for each operating unit. For socket welds, opportunistic destructive examination can be performed in lieu of volumetric examination. Because more information can be obtained from a destructive examination than from nondestructive examination, the applicant may take credit for each weld destructively examined equivalent to having volumetrically examined two welds.
As a result of the conference call, DEK is supplementing its response to RAI 82.1.2-2 ,
which was previously submitted , as amended , in DEK letter 10-548 dated September 23, 2010 [ADAMS ML102700162]. At Kewaunee , there are currently a total of 345 socket welds in ASME Class 1 small-bore piping systems. Therefore, the total number of ASME Class 1 socket welds that will be subject to volumetric examination is 10 welds. In the event that a demonstrated, nuclear-industry endorsed, inspection methodology is not available, destructive examinations of socket welds will be substituted for volumetric non-destructive examinations. Each destructive weld examination will be considered equivalent to performing two volumetric weld examinations , such that a maximum of five destructive examinations will be performed .
A minimum of four volumetric examinations or two destructive examinations (or an equivalent combination of examinations) will be performed prior to the period of extended operation. To allow for orderly planning and scheduling of plant resources and outage workload, the remaining examinations will be performed within three years of entering the period of extended operation . The extended schedule for performance of the remaining examinations is reasonable based on the plant-specific operating experience for the ASME Class 1 small-bore piping welds.
Serial No.10-665 Docket No. 50-305 Attachment 1/Page 2 of 2 Commitment 43 in LRA Appendix A, USAR Supplement, Table A6 .0-1 is superseded by the following:
Item Commitment Source Schedule 43 Ten volumetric examinations of ASME Letter 10-665; Four Class 1 small-bore socket welds will be Supplemental volumetric performed using a demonstrated, nuclear- Response to examinations industry endorsed, inspection RAI 82 .1.2-2 or two methodology that can detect cracking destructive within the specified examination volume, if examinations a methodology becomes available. In the (or an event that a demonstrated, nuclear- equivalent industry endorsed , inspection combination of methodology is not available , destructive examinations) examinations of socket welds will be prior to the substituted for volumetric non-destructive period of examinations. Each destructive weld extended examination will be considered equivalent operation .
to performing two volumetric weld examinations, such that a maximum of five Remaining destructive examinations will be examinations performed. within three years of entering the period of extended operation