ML20217J463
| ML20217J463 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/15/1997 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 97-569, NUDOCS 9710210112 | |
| Download: ML20217J463 (5) | |
Text
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e VIRGINI A ISt,ECTRIC AND I'OWER CmWANY Riemuisin Vinois A 2326:
i October 15, 1997 United States Nuclear Regulatory Commission Serial No.97-569 Attention: Document Contro! Desk NL&OS/ETS R0 Washington, D.C. 20555 Docket No.
50 338 License No.
NPF-4 Gent!cr~n:
VlHGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT _1 ASME SECTION XI RELIEF REQUEST NDE-45 l
EXTENSION OF INSERVICE INSPECTION INTERVAL The North Anna Unit 1 second inservice inspection interval is scheduled to end on December 24, 1998, it is desired to complete the examinations to satisfy the requirements of the ten-year end-of interval examinations during the refueling outage that is presently scheduled to commence on March 12,2000 and end on April 15,2000.
Pursuant to 10 CFR 50.55a(3)(ii) Virginia Electric and Power Company requests relief of ASME Code requirements, paragraph IWA-2400(c) (1083 Edition with Summer 1983 Addenda) to extend the second inservice inspection interval 127 days to April 30,1999.
This e,chedule relief, in concert with the one-year allowance provided in Code IWA-2400(c), would permit completion of the second ten-year inservice inspection interval consistent with the scheduled refueling outage period in March 2000. Relief Request NDE-45 for the interval extension and the basis for the relief request is provided in the attachment to this letter.
The Unit out of service time for steam generator eddy current inspections, tube plugging, and subsequent steam generator replacement exceeds ten months for two fuel cycles.
The additional outage time, which was caused by steam generator problems exceeds the 6 month requirement of the Code for qualifying for a Code a!!owable interval extension; however, this time is cumulative, but not continuous. The extension period requested by this relief is less than the duration of the combined out-of-service time for steam generator inspections and replacement. To perform the ten-year end of interval examinations during the currently scheduled September 1998 refueling outage or schedule an outage in 1999 would present a hardship without a compensating increase in quality or safety.
The last ten year reactor vessel examination was performed in May 1989.
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This relief request has beer reviewed and approved by the Station Nuclear Safety and j
Operating Committee.
j If you have any additional questions conceming this request, please contact us.
Very truly yours, i
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v J, P. O'Hanlon Senior Vice President - Nuclear i
Attachment I
j Commitments made in this letter:
None l
cc:
U. S. Nuclear Regulatory Commission Region ll Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 i
l Mr. M. J. Morgan NRC Senior Resident inspector j
North Anna Power Station 4
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i ASME Section XI Relief Request NDE-45 North Anna Power Station Un!t 1 North Anna Power Station Unit 1 Virginia Electric and Power Company
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Virginia Electric & Power Company North Anna Power Station Unit 1 Second 10 Year Interval Request for Relief Number NDE-45 1.
IDENTIFICATION OF COMPONENTS Class 1, Class 2, and Class 3 components.
11.
CODE REQUIREMENTS The 1983 Edition and Summer 1983 Addenda of ASME Section XI, IWA-2400(c) requires that a power unit must be out of service continuously for 6 months or more in order to extend the inspection interval to a period equivalent to the outage.
111.
CODE REQUIREMENT FROM WHICH RELIEF IS REQUESTED Relief is requested from fully meeting the 6 month-(continuously) out-of service requirement of the 1983 Edition and Summer 1983 Addenda of ASME Section XI, IWA-2400(c) in order to extend the interval, l
IV.
BASIS FOR RELIEF REQUEST North Anna Unit 1 was out of service for 140 days from February 25,1989 through July 16,1989. This refueling outage was extended for eddy current inspection of all tubes in all 3 steam generators.
North Anna Unit 1 was out of service for 72 days from December 23,1991 through March 5,1992 to perform mid-cycle steam generator inspection.
North Anna Unit 1 was out of service for 96 days from January 4,1993 through April 10,1993 for refueling and steam generator replacement.
Based on the above,- North Anna Unit 1 was out of service for 308 days for refueling and steam generator work. Conservatively assuming sixty days for a refueling outage where normal steam generator activities took place, six months of additional time was spent on steam generator related inspection and replacement activ!!!es.
The North Anna Unit 1 second inservice inspection interval is scheduled to end on December 24,1998. It is desired to complete the examinations to satisfy the
-requirements of the ten-year end-of-interval examinations during-the refueling Relief Request NDE-45 Unit 1 Page 1 of 2
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outage that is scheduled to commence on March 12,2000 and end on April 15, 2000. The Unit out of service time Ju.ing the interval exceeds ten months. This additional outage time, which was caused by steam generator problems exceeds the 6 month requirement of the Code for qualifying for an interval extension.
However,'even though the tirne is not continuous it was accumulated over just tvio fuel cples. The extension period requestad by this relief for the interval is leas than the durations of the combined out-of-service time for steam generator inspections and replacement.
To perform-the ten-year end of interval extminations during the currently scheduled September 1998 refueling outage or schedule an outage in 1999 would present a hards; iip without a compensating increase in quality or safety. The last ten year reactor vessel examination was performed in May 1989.
V.
PROPOSED ALTERNATE PROVISIONS It is proposed that the second ten inspection interval be extended 127 days to April 30,1999. The new interval completion date, along with the one-year period allowed by the Code "lWA-2400(c)", v:lIl enable us to complete the ter.. year examinations during the scheduled 2000 refueling outage.
Relief Requeet NDE-45 Unit 1 Page 2 of 2
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