ML20134G656

Forwards Addl Info Re Second Interval ISI Program ASME Relief Request

ML20134G656
Person / Time
Site:	North Anna
Issue date:	02/06/1997
From:	Saunders R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
97-027, 97-27, NUDOCS 9702100498
Download: ML20134G656 (9)

Text

_ _ _ . _ . ..

e VIRGINIA ELECTRIC AND POWEH COMPANY HICliMOND,YIHOINIA 20061 Febr.tary 6, 1997 1

l Document Control Desk Serial No.97-027 U. S. Nuclear Regulatory Commission NLOS/ETS: R1 Washington, D. C. 20005 Docket No. 50-339 License No NPF-7

Dear Sir:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 2

, SECOND INTERVAL INSERVICE INSPECTION PROGRA_lf ADDITIONAL INFORMATION ASME RELIEF REQUEST By letter dated December 7,1995 (Serial No.95-602), Virginia Electric and Power Company requested the use of Code Cases N-522 and N-535. In a subsequent letter dated June 10,1996 (Serial No. 95-602A), the request to use Code Case N-535 was withdrawn and the request for use of Code Case N-522 was revised and submitted as Relief Request SPT-16 for Unit 2 only. The NRC Staff requested additionalinformation to complete the review of the relief request. Relief Request SPT-16 has been revised to include the additional conditions and is provided in the Attachment to this letter.

This letter is not intended to establish any additional commitments. Should you have any questions or require additional information, please contact us. l 4

4 Very truly yours, 24d&

R. F. Saunders, Vice President [

/

Nuclear Engineering and Services p , ; if, r

Attachment ,

i 970210049G 970206 PDR ADOCK 05000339 G PDR

~

l i

j  !

cc: United States Nuclear Regulatory Commission  !

Regional Administrator  !

l Region ll l 101 Marietta Street, N. W Suite 2900 l

Atlanta, Georgia 30323 s

1 l Mr. R. D. McWhorter l NRC Senior Resident inspector j

! North Anna Power Station  :

i 4

t  :

4 l  !

l 4

i 1 i

i i

1 I

I i

1 ATTACHMENT 1 l REVISED RELIEF REQUEST SPT-16 NORTH ANNA POWER STATION UNIT 2 l

l I

Virginia Electric & Power Company North Anna Unit 2 Second 10-Year Interval Request for Relief No. SPT-16, Revision 2 I. IDENTIFICATION OF COMPONENTS Class 2 piping that penetrates the containment vessel where the piping and isolation valves are part of the containment system but the balance of the piping is outside of the scope of Section XI.

Drawing Test boundary Penetration Number 120!,0-SPM-096A 2 SH. 3 1"-SI-450-1502-01, 3"-SI-567-1502-01 7 between 2-SI-MOV-2867D and 3"-SI-568-1502-01, 3"-SI-568-1502-01 between 2-SI- l 2867C and 3"-SI-4171502-01, 3*-SI-417-1502 01 between 3" SI-568-1502 01 and i penetration 7 j 12050-SPM-096B-2 SH. 4 3"-SI-417-1502-01 between 2-SI-93 and 7 penetration 7 )

12050-SPM-079B-2 SH. 3 6"-CC-752-151-02 13 i 12050-SPM-095C-2 SH.1 3"-CH-479-1502-01 between 2-CH MOV- 15 2289A and 2-CH-335 12050-SPM-0958-2 SH.1 3* CH-499-153A-01 between 2-CH-MOV-2381 19 and penetration 19 12050-SPM-095C-2 SH. 2 3"-CH-499-153A-01 between 2-CH-MOV-2380 19 and penetration 19 and %"-CH-799-153A-01 between 2-CH-331 and penetration 19 l l

12050-SPM-096A-2 SH.1 1"-SI-413-602-02 between penetration 20 and 20 l 2-SI-47 12050-SPM-0968-2 SH.1 1" SI-413-602-02 between 2-SI-136 and 20 penetration 20 12050-SPM-096A-2 SH. 3 3"-SI-538-1502-01 between 2-St-MOV-2836 22 and penetration 22 12050-SPM-096B-2 SH. 4 3"-SI-538-1502-01 between 2 SI-85 and 22 penetration 22 12050-SPM-079A-2 SH. 2 8"-CC-678-151-02 25 12050-SPM-079A 2 SH. 4 8"-CC-688-151-02 26 12050-SPM-079A-2 SH. 3 8"-CC-739-151 -02 27 12050-SPM-090A-2 SH 1 2"-DG-435-153A-02 33

Drawing Test boundary Penetration Nurnber 12050-SPB-104B-2. SH.1 4" line between 2-FP-79 and 2-FP-82 34 12050-SPM-082B-2 SH. 2 1"-ARC-401-153A-Q2 between 2-RM-TV-200D 43 and 2-IA-428 12050-SPM-0828-2 SH. 2 1"-ARC-402153A-Q2 between 2-RM-TV-2008 44 and 2-RM-TV-200C 12050-SPM-0938-2 SH. 2 3"-RC-452-153A-Q2 between 2-RC-2519A to 45 2-RC-162 12050-SPM-095C-2 SH.1 2"-CH 666-1502-02 between 2-CH-332 and 2- 46 CH-FCV 2160 12050-SPM-082A-2 SH.1 2"-ACC-421-153A-Q2 between penetration 47 47 and 2-IA-250 12050-SPM-082B-2 SH.1 2"-ACC-421-153A-Q2 between penetration 47 47 and 2-lA-TV-202B 12050-SPM-096B-2 SH.1 1"-SI-498-601-Q2 between 2-SI-HCV-2936 50 and 2-SI TV-201 12050-SPM-096B-2 SH.1 1"-SI-517-1501 02 between 2-SI-132 and 2- 53 SI-TV-200 12050-SPM-089B-2 SH. 2 %"-SS-749-ICN9-Q1 between 2-SS-TV-206A 56B and 2-SS-TV 206B 12050-SPM-089B-2 SH. 2 %"-SS-750 lCN9-01 between 2-SS-TV-202A 56C and 2-SS-TV-202B 12050 SPM-089A-2 SH. 3 %"-SS-622-ICN9-Q2 between 2-SS-TV-212A 56D and 2-SS-TV-2128 12050-SPM-089B 2 SH.1  %"-SS-402-ICN9 02 between 2-SS-TV-201 A 57C and 2-SS-TV-201B 12050-SPM-096A 2 SH. 2 10" SI-415-1502-01 and 6*-SI-416-1502-01 60 12050-SPM-096B-2 SH. 4 6"-SI-416-1502-01 between 2-SI-126 and 60 penetration 60 12050-SPM-096A-2 SH. 2 10"-SI 4641502-01 and 6"-SI-421-1502-01 .61 12050-SPM-096B-2 SH. 4 6*-SI-421-1502-Q1 between 2-SI-128 and 61 penetration 60 12050-SPM-096A-2 SH. 2 6*-SI-531-1502-Q1,10*-SI-418-1502-01, and 62 10"-SI-624-1502-01 12050-SPM-096B-2 SH. 4 6"-SI531-1502-01, 6"-S1-532-1502-01 62 be. tween 6*-SI-531-1502-01 and 2-SI-105, and 6"-SI-533-1502-01 between 6"-S1-531-1502-Q1 and 2 SI 99

Drawing Test boundary Penetration Number 12050-SPM-096B-2 SH. 2 8"-OS-439-153A-02 between 2-OS MOV-2018 63 I

and 2-OS-22 12050-SPM-096B-2 SH. 2 8"-OS-437-153A-02 between 2-OS-MOV- 64  !

201 A and 2-OS-11 f

12050-SPM-091 A-2 SH. 4 12"-RS-407-153A-Q2 and 8"-RS-J73-153A-02 66 12050-SPM-091 B-2 SH.1 8"-RS-J73-153 A-02, 4"-RS-4 57-153 A-02, 8"- 66 RS-456-153A-02, and 6"-RS-J82-153A-02 12050-SPM-091 A-2 SH. 4 12"-RS-408-153A-02 and 8"-RS-J74-153A-Q2 67 12050-SPM-091B-2 SH.1 8"-RS-J74-153 A-02, 4"-RS-461-153 A-02, 8"- 67 RS-460-153A-Q2, and 6"-RS-J83153A-Q2 12050-SPM-091 A-2 SH. 4 10"-RS-410-153A-Q2 between 2-RS-MOV- 70 256B and 2-RS-30  ;

12050-SPM-091 A-2 SH. 4 10"-RS-409-153A-02 between 2-RS-MOV- 71 l 256A and 2-RS-20 l 11715 SPM-0788-2 SH. 3 16" WS-627151-02 between 2-SW-MOV- 79 ,

203D and 2-SW-104 I 11715-SPM-0788-2 SH. 3 16"-WS-625-151-02 between 2-SW-MOV- 80 203C and 2-SW 94 11715-SPM-078B-2 SH. 3 16*-WS-623-151-02 between 2-SW-MOV- 81 203B and 2-SW-84 I 11715-SPM-0788-2 SH. 3 16*-WS-621-151-02 between 2-SW MOV- 82 203A and 2-SW-74 l 11715-SPM-078B-2 SH. 3 16"-WS-622-151-02 83 11715-SPM-0788-2 SH. 3 16"-WS-624-151-02 84 11715-SPM-078B-2 SH. 3 16"-WS-626-151-02 85 '

11715-SPM-0788-2 SH. 3 16"-WS-628-151-02 86 12050-SPM-072A-2 SH. 2 6"-AJA-410-151-02 89 11715-SPM-106A-2 SH. 3  %"-HC-75-lCN9-02 between 2-HC-TV-200A 98A and 2 HC-TV-2008 11715-SPM-088A-2 SH. 3 6"-RP-454-152-02 and 6"-RP-444-153 A-02 103 11715-SPM-088A-2 SH. 3 6"-RP-449-152-02 104 11715-SPM-106A-2 SH. 2  %"-HC-413-lCN6-02 between 2-HC-TV-203B 109 and 2-HC-3-154-02, and 2 %"-HC-440-154-02 between 2"-HC-3-154-02 and 2-HC-TV-207B, and 2-HC-3-154-Q2 12050-SPM-096A-2 SH. 3 3"-SI-457-1502-01 113

Drawing Test boundary Penetration Number 12050-SPM-0968-2 SH. 4 3* SI-457-1502-01 between 2-St-119 and 113 penetration 113 i

12050-SPM-096A-2 SH. 3 3"-SI-539-1502-01 114 1 12050-SPM-096B-2 SH. 4 3"-SI-539-1502-01 between 2-SI-107 and 114 penetration 114 II. IMPRACTICABLE CODE REQUIREMENTS l l

Table IWC-2500-1, Examination Category C-H, Items C7.30 and j C7.70 requires a system pressure test each inspection period and Items C7.40 and C7.60 requires a system hydrostatic test each inspection interval.

III. CODE REQUIREMENT FROM WHICH RELIEF IS REQUESTED 1

Relief is requested from performing the Code-required hydrostatic test at the end of the inspection interval and the  !

Code-required system pressure test during each period for the l containment penetrations listed.

IV. BASIS FOR RELIEF The sole safety function of the piping and associated valves listed is to provide containment isolation. The components listed are part of the containment system. Containment penetrations are classified as Class 2 per ANSI 18.2, " Nuclear Safety Criteria for the Design of Stationary Pressurized Water Reactor Plants", section 2.3.1.2 (1). For the subject penetrations the connecting piping beyond the containment isolation valves serves no safety function and is classified as nonclass by the classification criteria used by Virginia Electric and Power Company for North Anna Unit 2.

The ASME Section XI pressure testing requirements have verified leak-tight integrity by an over pressure test every ten years and a nominal operating test every inspection period. The 10-year hydrostatic tests were considered inordinately burdensome for the margi nal benefit in safety they assure and have been eliminated by Code Case N-498,

" Alternative Rules for 10-year Hydrostatic Pressure Testing for Class 1 and 2 Systems,Section XI, Division 1", which has been approved by Regulatory Guide 1.147, Inservice Inspection Code Case Acceptability ASME Section XI Division 1. The 10-Year hydrostatic test is now conducted at nominal operating pressure.

l l

1 The subject penetrations are Type C pressure tested to a peak containment internal pressure of greater than or equal to 44.1 psig. This test is performed to satisfy Technical Specification Surveillance Requirement 4.6.1.2 which requires i all containment penetrations to be leak rate tested as I required by 10 CFR 50, Appendix J, Option B, as modified by approved exemptions, and in accordance with the guideline contained in Regulatory Guide 1.163, dated September 1995.

The testing frequency of 10 CFR 50, Appendix J, Option B is ,

l performance based and can vary from 2 years to 5 years or i three refueling cycles. This frequency will not coincide with the inspection period frequency required in Table IWC-2500-1 for system pressure tests and therefore, the ASME Code in effect at North Anna will require additional leak tightness testing.

The ASME Section XI Code has acknowledged that testing of these components beyond the requirements of Appendix J is not necessary and issued Code Case N-522, " Pressure Testing of Containment Penetration Piping", to define its position.

NUREG-1493, " Performance-Based Containment Leak-Test Program",

concluded that prescriptive leak rate testing could be replaced with performance based requirements with only a marginal and acceptable impact on safety. The total cost of Type B (electrical penetrations) and Type C testing all i containment penetrations (approximately 90 penetrations) was i estimated to be $87,500 per outage for North Anna as reported '

in NUREG-1493. NUREG-1493 estimates that 5% of the total cost of Type B & C testing could be saved if the acceptance criteria were relaxed. Performing ASME Section XI pressure testing beyond the requirements of 10 CFR 50, Appendix J, Option B testing would cause Virginia Electric & Power Company to incur additional cost with a marginal gain in safety.

V. PROPOSED ALTERNATIVE As an alternative to the testing frequency and pressurec required by Table IWC-2500-1, Examination Category C-H, Items C7.30, C7.40, C7.60, and C7.70, the subject penetrations and associated piping and valves, will be pressure tested at peak containment calculated pressures to the requirements of 10 CFR Appendix J, as allowed by Code Case N-522. Testing will be performed in accordance with Technical Specification Surveillance Requirement 4.6.1.2 which requires all containment penetrations to be leak rate tested as required by 10 CFR 50, Appendix J, Option B, as modified by approved exemptions, and in accordance with the guideline contained in Regulatory Guide 1.163, dated September 1995.

Methods for the detection and location of leakage at containment isolation valves and the pipe segments between the containment isolation valves will be identified in procedures.

All subject penetrations will be Type C tested at least once every 60 months.

. 4 VI. IMPLEMENTATION SCHEDULE The Technical Specifications were revised on 2/9/96 to incorporate 10 CFR 50, Appendix J, Option B. The subject containment penetratiors were Type C tested in the second period. The third period starts on 12/14/97. Test intervals for valves having two consecutive periodic As-found Type C tests where the results are within the allowable administrative limits may be increased up to a maximum of 60 months. The subject valves have satisfied this criteria and are not scheduled to be tested during the third period.

l l

l

~

l i