ML20086F145

Forwards ISI Program Relief Requests NDE-20,Rev 2 & NDE-26 for North Anna Unit 1

ML20086F145
Person / Time
Site:	North Anna
Issue date:	07/10/1995
From:	Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
95-230, NUDOCS 9507130045
Download: ML20086F145 (19)

Text

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. l VIRGINIA ELECTRIC AND Powan Comwwy l RICIIMOND, VIRGINIA 202 61 i

-July 10, 1995 l

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U.S. Nuclear Regulatory Commission Serial No.95-230 I Attention: Document Control Desk NL&P/DCH R2 Washington, D.C. 20555 Docket No. 50-338 License No. N PF-4 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 1 INSERVICE INSPECTION PROGRAM RELIEF REQUEST North Anna Unit 1 is currently in the second period of its second ten-year inservice ,

inspection interval. North Anna Unit 1 examinations have been conducted to the l requirements of the 1983 Edition, through Summer 1983 Addenda, of ASME Section XI.

Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from certain requirements of  ;

the ASME Section XI Code associated with partial examinations conducted for North  ;

Anna Unit 1. Relief Requests NDE-20, Rev. 2, and NDE 26 for North Anna Unit 1 l (attached) provide the basis for the requested relief. Relief Request NDE-20, Rev. 2, . '

supersedes Relief Request NDE-20 submitted by our letter dated August 5,1993 (Serial No.93-435).

These relief requests have been approved by the North Anna Station Nuclear Safety '

and Operating Committee.

1 If you have any questions conceming these requests, please contact us. l 1

Very truly yours, 1

James P O'Hanlon

. Senior Vice President - Nuclear i

Enclosures i

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ny 9507130045 950710 PDR ADOCK 0500o338 Q PDR

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cc: .U.S. Nuclear Regulatory Commission

- Region ll '

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 U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30323 1

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North Anna Power Station Unit 1 ASME Section XI Relief Request NDE-20 R 1

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NARTH ANNA UNIT 1 RELIEF REQUEST NDE-20 REVISION 2 l

1. IDENTIFICATION OF COMPONENTS Mark / Weld # Linn # Drawing # Class 1 RC-R-1 11715-WMKS-RC-R-1.2 1 1 SI-TK-2 11715-WMKS-SI-TK-2 2 1

10 6"-RC-39-1502-Q1 11715-WMKS-RC-E-2 1 11 6"-RC-38-1502-Q1 11715-WMKS-RC-E-2 1 12 6"-RC-37-1502-01 11715-WMKS-RC-E-2 1 37 27 %"-RC-3 2501-01 11715-WMKS-0109E-1 1 SW-39 12"-RC-22-1502-01 11715-WMKS-0109E-2 1 l

l SW-19 6"-RC-18-1502-01 11715-WMKS-0109F-2 1 SW-41 12"-RC-23-1502-01 11715-WMKS-0109F-2 1 SW-42 6"-RC-19-1502-01 11715 WMKS-0109F-2 1 i  !

l l 11. IMPRACTICABLE CODE REQUIREMENTS The 1983 edition, Summer 1983 Addenda (inclusive) of ASME Section XI in Tables IWB-2500-1 and IWC-2500-1 does not allow any limitations to the required volumetric and surface examinations. 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%

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Ill. BASIS FOR RELIEF l The components listed above have been examined to the extent practical as l required by the Code. Due to interferences of other components or weld joint '

geometry, the reduction in coverage for the listed components was greater than 10E Tables NDE-20-1, 2, 3, and 4 are provided detailing the limitations experienced. Amplifying sketches are also provided. Alternative components could not be substituted for examination due to the mandatory selection requirements of the Code.

IV. ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.

Tebla NDE-20-1,. Rr,vi2 inn 2 .= -

North Anna Unit 1 Examination Coverage Estimates (Reactor Vessel)- ,

Category B-A, item B1.40 -

Mark / Weld # Beam Anale Exam Area Scan Direction %_Eram Reason For Partial Sketch!! -

1 (120- 240 ) 0 Weld & Base -

72 Joint Configuration 1 A & 18 l 45 Weld 2 13 And Lifting Lug 45 Weld 5 97 Interference 45 Weld 7 99 45 W eld 8 99 60 Weld 2 7 60 - W eld 5 98 60 W eld 7 99 60 Weld 8 99 45 & 60 Base 2 36 45 & 60 Base 5 91 45 & 60 Base '7 68 45 & 60 Base 8 68 Surface coverage 98%

UT Scan Direction Definitions 2 - Axial scan flange side of weld 5 - Axial scan head side of weld 7 - Circumferential scan, clockwise (looking down on head) 8 - Circumferential scan, counterclockwise (looking down on head)

Revision 2 March 23, 1995

45 DEGREE AND 60 DEGREE ~0 SCAN DIRECTIONS 5 7

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North Anna Unit 1 Examination Coverage Estimates (Vessels) ,

Category B-D, item B3.110 Mark / Weld # Beam Angle Exam Area Scan Direction % Exam Beason For Partial Sketch #

10,11,12 0 Weld & Base -

80 Nozzle Geometry, 2 45 Weld 2 85 Cladding Prevents 45 W eld 5 25 Extended V-path 45 Weld 7 100 45 W eld 8 100 60 Weld 2 90 60 W eld 5 15 60 W eld 7 100 60 We!d 8 100 45 & 60 Base 2 80 45 & 60 Base 5 35 45 & 60 Base 7 65 45 & 60 Base 8 65 UT Scan Direction Definitioits 2 - Axial scan flange side of weld 5 - Axial scan head side of weld 7 - Circumferential scan, clockwise (looking down on head) 8 - Circumferential scan, counterclockwise (looking down on head)

Revision 2, March 23, 1995

Tcblo NDE-20-3, R vici:n 2 -

North Anna Unit 1 Examination Coverage Estimates (Piping & Integral Attachments) ,

UT Scan Coverace % Surface Mark / Weld # Cateoorv Item # 2 5 Z H Coveraae % Reason For Partial Sketch #

37 B-J B9.11 75 0 90 90 100 Nozzle and Weld Geometry, Material Attenuation Prevent SW-39 B-J B9.31 90 0 27 27 100 Branch Connect Configuration 4 SW-19 B-J B9.31 90 0 27 27 100 Branch Connect Configuration 4 SW-41 B-J B9.31 90 0 27 27 100 Branch Connect Configuration 4 SW-42 B-J B9.31 90 0 27 27 100 Branch Connect Configuration 4 UT Scan Direction Definitions 2 - Axial scan,180 degrees from isometric flow direction (weld count).

5 - Axial scan, the same direction as the isometric flow (weld count).

7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.

8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.

Revision 2, March 23, 1995

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V TYPICAL SV-19, SV-39 S V-41 AND SV-42 5 SIDE o N0ZZLE 180 29 -RC-4-2501 R-01 (SV-19) 2 SIDE 27 1/2"-RC-3-2501 R-01 FL0V . (SV;39 g, , -RC-6-2501 R-01

[SV-41 AND SV-42) i ( [/[/M SKETCH 4 1 1715-W M K S-109E-2 WELD SW-39 l l 715-WMKS-109F-2 WELDS SW-19, SW-41, & SW-42

Tcbl3 NDE-20-4, Rsvizien 2 .'

North Anna Unit 1 Examination Coverage Estimates (Boron injection Tank) ,

Category C-A, Item C1.20 -

Mark / Weld # Beam Anate Exam Area Scan Direction *f Exam Reason For Partial Sketch # -

1 (58"-116") 0 Wald & Base -

91 Support Legs 3 and 4 5 l 45 Weld 2 95 .g 45 W eld 5 82 45 W eld 7 100 45 W eld 8 100 60 W eld 2 99 60 Weld 5 78 60 W e!d 7 100 60 W eld 8 100 45 & 60 Base 2 98 45 & 60 Base 5 80 45 & 60 Base 7 (2 side) 100 45 & 60 Base 8 (2 side) 100 45 & 60 Base 7 (5 side) 87 45 & 60 Base 8 (5 side) 87 1

I UT Scan Direction Definitions 2 - Axial scan head side of weld 5 - Axial scan shell side of weld 7 - Circumferential scan, clockwise (lookirg down on tank) $

1 8 - Circumferential scan, counterclockwise (looking down on tank)

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ATTACHMENT 2 e North Anna Power Station Unit 1.

ASME Section XI Relief Request NDE-26 l

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NORTH ANNA UNIT 1  ;

RELIEF REQUEST NDE-26 l )

1. IDENTIFICATION OF COMPONENTS Mark / Weld # Line # Drawina # Class 4A 29"-RC-1 -2501 -01 11715-WMKS-0109E-1 1 N-SE29 IN 29"-RC-1-2501-01 11715-WMKS-RC-E-1 A.2P 1 5A 31"-RC-2-2501-01 11715-WMKS-0109E-1 1 N-SE31 IN 31"-RC-2-2501 -01 11715-WMKS-RC-E-1 A.2P 1 16A 29"-RC-4-2501-01 11715-WMKS-0109F-1 1 N-SE29 IN 29"-RC-4-2501-01 11715-WMKS-RC-E-18.2P 1 17A 31"-RC-5-2501 -01 11715-WMKS-0109F-1 1 N-SE31 IN 31 "-RC-5-2501 -Q1 11715-WMKS-RC-E-18.2P 1 28A 29"-RC-7-2501 -01 11715-WMKS-0109G-1 1 .

N-SE29 lN 29"-RC-7-2501 -01 11715 WMKS-RC-E-1C.2P 1 29A 31"-RC-8-2501 -Q1 11715-WMKS-0109G-1 1 N-SE31 IN 31 "-RC-8-2501 -01 11715-WMKS-RC-E-1C.2P 1

11. IMPRACTICABLE CODE REQUIREMENTS The 1983 edition, Summer 1983 Addenda (inclusive) of ASME Section XI in  !

Table IWB-2500-1 does not allow any limitations to the required volumetric and '

surface examinations. 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 % i Ill. BASIS FOR RELIEF  ;

The components listed above have been examined to the extent practical as .

required by the Code. Longitudinal waves were used to perform the  !

examination because of the materials involved (cast stainless steel and inconnel). However, the use of longitudinal waves prevents the use of beam  :

extension to increase examination volume. Due to interferences of other components or weld joint geometry, the reduction in coverage for the listed ,

components was greater than 10% Table NDE-26-1 is provided detailing the ,

limitations experienced. Amplifying sketches are also provided. Alternative i components could not be substituted for examination due to the mandatory selection requirements of the Code.  ;

IV. ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage '

be counted as meeting the Code requirements. t

Tcblo NDE-26-1 .

North Anna Unit 1 Examination Coverage Estimates

• UT Scan Coverage % Surface Mark / Weld # Cateaory item # 2 5 Z B- Coveraae % Reason For Partial Sketch #

N-SE-29 IN (A) B-F B5.70 8 100 100 100 100 Nozzle Geometry, Material Attenuation Prevent Extended V-Path 1 N-SE-31 IN (A) B-F B5.70 100 8 100 100 100 Nozzle Geometry, Material Attenuation Prevent Extended V-Path 1 N-SE-29 IN (B) B-F B5.70 8 100 100 100 100 Nozzle Geometry. Material Attenuation Prevent Extended V-Path 1 N-SE-31 IN (B) B-F B5.70 100 8 100 100 100 Nozzle Geometry, Material Attenuation Prevent Extended V-Path 1 N-SE-29 IN (C) B-F B5.70 8 100 100 100 100 Nozzle Geometry, Material Attenuation Prevent Extended V-Path 1 N-SE-31 IN (C) B-F B5.70 100 8 100 100 100 Nozzle Geometry, Material Attenuation Prevent Extended V-Path 1 4A B-J 89.11 100 70 75 75 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 5A B-J 89.11 91 94 80 80 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 16A B-J B9.11 100 62 90 90 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 17A B-J B9.11 62 100 90 90 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 28A B-J 89.11 78 100 90 90 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 29A B-J B9.11 83 100 90 90 100 Nozzle & Weld Crown Geometry, Material Attenuation Prevent Extended V-Path 2 i

UT Scan Direction Definitions I

! 2 - Axial scan,180 degrees from isometric flow direction (weld count).

l 5 - Axial scan, the same direction as the isometric flow (weld count).

7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.

8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.

Revision 2, March 23, 1995

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weld buildup, weld buildup. See Table NDE-26-1. '

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