ML20082C689

Requests Relief from Requirements of ASME Section XI Code Associated W/Extent of Exams Practical for Upcoming North Anna Unit 2 SG Replacement.Isi Program Relief Request NDE-22 for North Anna Unit 2 Encl

ML20082C689
Person / Time
Site:	North Anna
Issue date:	04/03/1995
From:	Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
95-127, NUDOCS 9504070116
Download: ML20082C689 (11)

Text

{{#Wiki_filter:-. VIHOINIA Er.ncTurc Awn Pownn COMPANY Hicnuonn, VIRGINIA 23261 April 3, 1995 U.S. Nuclear Regulatory Commission Serial No. 95-127 Attention: Document Control Desk NL&P/JBL R1 Washington, D.C. 20555 Docket No. 50-339 Ucense No. N.PF-7 Gentlemen: YlRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 2 INSERVICE INSPECTION PROGRAM RELIEF REQUEST Pursuant to 10 CFR 50.55a(g)S(iii), relief is requested from certain requirements of the ASME Section XI Code associated with the extent of examinations practical for the upcoming North Anna Unit 2 steam generator replacement. North Anna Unit 2 is currently in the second period of the second ten-year interval. The North Anna Unit 2 inservice inspection program is conducted in accordance with the 1986 Edition of ASME Section XI. The attachment to this letter, Relief Request NDE-22 for North Anna Unit 2, is provided to detail the basis for the requested relief. This relief request has been reviewed and approved by the North Anna Station Nuclear Safety and Operating Committee. If you have any questions, please contact us. Very truly yours, 61 Nrz J8 P. O'Hanlon Sen or Vice President - Nuclear Attachment C'700 43 ,kv$I \\gil 95o4o7o116 95o4o3 DR ADOCK 05oo 9

- oc: UtS. Nuclear Regulatory Commission Region ll i 101 Marietta Street, N.W. Suite 2900 Atlanta, Georgia. 30323 Mr. R. D. McWhorter NRC Senior Resident inspector North Anna Power Station Mr. N. Economos NRC Inspector U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W. Suite 2900 Atlanta, Georgia 30323 ) l i 1 m.

a b 4 I t L ATTACHMENT North Anna Power Station Unit 2 ASME Section XI Relief Request ilDE-22 f 1 J 1 b k i 1 e

7.. l b RELIEF REQUEST NDE-22 I. . IDENTIFICATION OF COMPONENTS i Drawing Line # Weld #

gnL, 12050-WMKS-RC-E-1A.2P 29"-RC-401-2501R-Q1 N-SE31IN-B-F 12050-WMKS-RC-E-1A.2P 31"-RC-402-2501R-Q1.

N-SE29IN B-F 12050-WMKS-RC-E-1B.2P 29"-RC-404-2501R-Q1 N-SE31IN B-F 12050-WMKS-RC-E-1B.2P 31"-RC-405-2501R-Q1 N-SE29IN B-F 12050-WMKS-RC-E-1C.2P 29"-RC-407-2501R-Q1 N-SE31IN B-F 12050-WMKS-RC-E-1C.2P 31"-RC-408-2501R-Q1 N-SE29IN B-F. .II. IMPRACTICAL CODE REQUIREMENTS ASME Section XI, 1986 Edition, requires full coverage of the lower ~ 1/3t volume of B-F welds as depicted on Figure. IWB-2500-8. Code Case N-460, Alternative ' Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%. III. BASIS FOR RELIEF The Category B-F welds listed above are the nozzle-to-safe end welds on the replacement steam generators for North Anna Unit 2. The extent of examination for the axial scans from the nozzle side of the weld was limited as depicted on Figure NDE-22-1. The limitation was caused by the nozzle outside radius which restricts movement of the transducer on the nozzle side of the weld. The category B-F welds listed above were examined with focused. dual element longitudinal wave transducers. The use of focused longitudinal waves was necessary because the weld joint. is carbon /inconal/ stainless design. The sio of the search unit that can be used is dictated by focal length and frequency required to examine the-particular weld thickness. The smallest practical size search unit possible was used to conduct the above examinations. As shown by Figure NDE-22-1,100% of the required volume was examined in the axial direction from the safe and side of the weld and in both circumferential directions. It is not.possible to extend the beam path to examine the weld in two directions from one side of the weld due to the necessity to use focused longitudinal waves to obtain a meaningful examination of the welds. No other supplemental ultrasonic means of examination is practical to examine additional weld volume-for the Category B-F welds ~ listed above. 'l IV. ALTERNATE PROVISIONS It is proposed that the Category B-F examinations already completed at the reduced coverage be counted as meeting the Code requirements for preservice inspections as well as future inservice inspections. V. STATUS ) Pending ') i

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