ML20046C320
| ML20046C320 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/05/1993 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 93-435, NUDOCS 9308100137 | |
| Download: ML20046C320 (26) | |
Text
.. -
l VIILOINIA }$LECTitIC ANI) POWElf COMi%NY j
R ICH M OND, ViltGIN1A 20061 i
i August 5, 1993 i
United States Nuclear Regulatory Commission Serial No.93-435 Attention: Document Control Desk NL&P/EJW Washington, D.C. 20555 Docket Nos.
50-338 50-339 License Nos. NPF-4 NPF-7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 INSERVICE INSPECTION PROGRAM SECOND TEN YEAR INTERVAL RELIEF REQUESTS North Anna _ Power Station Unit 1 is presently in the second period of the second ten-year interval.
North Anna. Unit 1 examinations have been conducted to the requirements of the 1983 Edition and Summer 1983 Addenda of ASME Section XI.
North Anna Unit 2 is currently in the first period of the second ten year interval. North Anna Unit 2 examinations have been conducted to the requirements of the 1986 Edition of ASME Section XI.
I Pursuant to 10 CFR 50.55a (g) 5, relief is requested from certain requirements of the ASME Section XI Code associated with partial examinations conducted for North Anna Unit 1. Relief Request NDE-20 (attached)is being provided detailing the basis of this relief. Relief is also requested from certain requirements of ASME Section XI associated with hydrostatic testing for North Anna Units 1 and 2.
Relief Requests SPT-12 (attached) for Unit 1 and SPT-15 (attached) for Unit 2 are provided detailing the basis for this relief.
i i
These relief requests have been approved by the North Anna Station Nuclear Safety and Operating Committee.
If you have any questions concerning these requests, please contact us.
Very truly yours, i
j kCC_ -[-
hj (O'5b W. L. Stewart Senior Vice President - Nuclear Enclosures
?(b kt\\
9308100137 9308o5 C
PDR ADOCK 0500o338
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cc:
United States Nuclear Regulatory Commission Region ll 101 Marietta Street, N.W.
Suite 2900 Atlanta, GA 30323 NRC Senior Resident inspector North Anna Power Station t
s 9
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j S rial No.93-435 NORTH ANNA UNIT 1 RELIEF REQUEST NDE-20 1.
IDENTIFICATION OF COMPONENTS 1
Mark / Weld #
Line #
Drawina #
. Class 1
RC-R-1 11715-WMKS-RC-R-1.2 1
1 SI-TK-2 11715-WMKS-SI-TK-2 2
10 6"-RC-39-1502-01 11715-WMKS-RC-E-2 1
11 6"-RC-38-1502-01 11715-WMKS-RC-E-2 1
12 6"-RC-37-1502-01 11715-WMKS-RC-E-2 1
4A 29"-RC-1-2501-01 11715-WMKS-0109E-1 1
5A 31"-RC-2-2501 -01 11715-WMKS-0109E-1 1
37 271/2"-RC-3-2501-01 11715-WMKS-0109E-1 1
SW-39 12"-RC-22-1502-01 11715-WMKS-0109E-2 1
16A 29"-RC-4-2501-01 11715-WMKS-0109F-1 1
17A 31"-RC-5-2501-Q1 11715-WMKS-0109F 1 1
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
28A 29"-RC-7-2501-01 11715-WMKS-0109G-1 1
29A 31"-RC-8-2501 -01 11715-WMKS-0109G-1 1
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%.
111.
BASIS FOR RELIEF The components listed above have been examined to the extent practical as required by the Code. Due to interierences of other components or weld joint r
geometry, the reduction in coverage for the listed components was greater than 10%. Tables NDE-20-1, 2, 3, and 4 are provided detailing the limitations i
experienced. A.mplifying 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.
i
9 Table ND E-20-1 North Anna' Unit 1 Examination Coverage Estimates (Reactor Vessel)
Category B-A, Item B1.40 Mark / Weld #
Beam Anale Exam Area Scan Direction
% Exam Reason For Partial Sketch #
72 Joint Configuration 1 A & 18 1 (0* - 120')
13 And Lifting Lug 45 Weld 5
97 Interference 45 Weld 7
99 45 Weld 8
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98 60 Weld 7
99 60 Weld 8
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68 Surface coverage 98%
UT Scan Direction Definitions 2 - Axialscan flange side of weld 5 - Axial scan head side of weld i
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Table N D E-20-2 North Anna Unit 1 Examination Coverage Estimates (Vessels)
Category B-D, item B3.110 Mark / Weld #
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% Exam Reason For Partial Sketch #
10,11,12 0
Weld & Base 80 Nozzle Geometry, 2'
45 Weld 2
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25 Extended V-path 45 Weld 7
100 45 Weld 8
100 60 Weld 2
90 60 Weld 5
15 60 Weld 7
100 60 Weld 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 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) l 1
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Table NDE-20-3 North Anna Unit 1 Examination Coverage Estimates (Piping & Integral Attachments)
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LIT Scan Coveraae %
Surface MaridWoki #
Catecorv Item #
2 5
2 B
Coverace % Reason For Partial Sketch #
4A B-F B5.70 100 70 75 75 100 Nozzle & Weld Crown Geometry, Material 3
Attenuation Prevents Extended V-path SA B-F B5.70 91 94 80 80 100 Nozzle & Weld crown Geometry, Material 3
Attenuation Prevents Extended V-path 16A B-F B5.70 100 62 90 90 100 Nozzle & Weld crown Geometry, Material 3
Attenuation Prevents Extended V-path 17A B-F B5.70 62 100 90 90 100 Nozzle & Weld crown Geometry, Material 3
Attenuation Prevents Extended V-path 28A B-F B5.70 78 100 90 90 100 Nozzle & Weld crown Geometry, Material 3
Attenuation Prevents Extended V-path 29A B-F B5.70 83 100 90 90 100 Nozzle & Weld crown Geometry, Material 3
Attenuation Prevents Extended V-path 37 B4 09.11 75 0
90 90 100 Nozzle & Weld crown Geometry, Material 4
Attenuation Prevents Extended V-path SW-39 B4 B9.31 90 0
27 27 100 Branch Connection Configuration 5
SW-19 B4 B9.31 90 0
27 27 100 Branch Connection Configuration 5
SW-41 B4 B9.31 90 0
27 27 100 Branch Connection Configuration 5
SW42 B4 89.31 90 0
27 27 100 Branch Connection Configuration 5
UT Scnn Direction Definitions 2 - Axial scan,180 degrees from isometric flow direction (weld munt).
5 - Axial scan, the same direction as the isometric flow (weld count).
7 - Circumferential scan, clockwise rotat' n when viewing in the direction of isometric flow.
o 8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.
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Table. NDE-20-4 North Anna Unit 1 Examination Coverage Estimates (Boron injection Tank)
Category C-A, item C1.20 Mark / Weld #
Beam Anale Exam Area Scan Direction
% Exam Reason For Partial Sketch #
91 Support Legs 3 and 4 6
1 (58"-116")
0 Weld & Base
'45 Weld 2
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100 45 Weld 8
100 60 Weld 2
99 60 Weld 5
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100 60 Weld 8
100 45 & 60 Base 2
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. Base 5
80 d
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 UT Scan Direction Definitions 2 - Axial scan head side of weld 5-Axial scan shel side of weld
' 7 - Circumferential scan, clockwise (looking down on tank) 8.- Circumferential scan, counterciodwise (looking down on tank) i-l l
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S rial No.93-435 NORTH ANNA UNIT 1 RELIEF REQUEST SPT-12 1.
IDENTIFICATION OF COMPONENTS Class 1, 2, and 3 Components.
- 11. IMPRACTICAL CODE REQUIREMENTS IWA-4000 and IWA-5214 require a hydrostatic pressure test in accordance with IWB-5000, IWC-5000, or IWD-5000 following welded repairs or installation of replacement items by welding.
Ill. BASIS FOR RELIEF in past situations our utility has been required to defer or ask relief from ASME Section XI hydrostatic tests following repair or replacement activities due to various reasons, which identified a basis of impracticality. This has ranged from boundary valve isolation problems to incorporation of the steam generators in the test boundary. These situations have necessitated in some cases immediate communication with and approval from the NRC, so that start-up delays or LCO conditions could be avoided. Test deferrals, like those associated with the steam generator, eventually must be conducted, and are considered inordinately burdensome, considering that the ten-year hydrostatic tests have been eliminated for Class 1 and 2 systems with the approval in Regulatory Guide 1.147, Code Case N-498,
" Alternative Rules for 10-year Hydrostatic Pressure Testing for Class 1 and 2 Systems,Section XI, Division 1."
The Code has recognized that alternative rules should be available to hydrostatic testing to allow an option to the owner. They have developed Code Case N-416-1, Alternative Pressure Test Requirement for Welded Repairs or installation of Replacement items by Welding." This Code Case as of this writing has been passed by Section XI and has been sent up to Main Committee for approval. Accordingly, it is considered impractical to maintain only the hydrostatic option.
1 of 2
Serial No.93-435 B.gilEF REQUEST SPT-12 (Continued):
IV. ALTERNATE TESTING in situations following welded repairs or installation of replacement items by welding, when the hydrostatic test required by IWA-4000 or IWA-5214 is not performed, the following alternative requirements shall be applied:
1)
NDE shall be performed in accordance with the methods and acceptance criteria of the applicable Subsection of the 1989 Edition of ASME Section Ill. Additionally, where no construction NDE is required on partial and full penetration welds greater than 1 inch nominal pipe size, these welds shall receive a surface examination as a minimum.
2)
Prior to or immediately upon return to service, a VT-2 visual examination shall be performed in conjunction with a system pressure test, using the 1983 Edition Summer 1983 Addenda of Section XI, in accordance with IWA-5000, at nominal operating pressure and temperature.
3)
Use of this alternative shall be documented on the NIS-2 Form.
if the original Code Case N-416 was used to defer a Class 2 hydrostatic test, the deferred test may be aliminated when the requirements of this i
alternative testing have been met.
P 2 of 2
Serial No.93-435 NORTH ANNA UNIT 2 RELIEF REQUEST SPT-15 1.
IDENTIFICATION OF COMPONENTS Class 1,2, and 3 Componentr,.
II. IMPRACTICAL CODE REQUIREMENTS lWA-4000 and IWA-5214 require a hydrostatic pressure test in accordance with IWB-5000, IWC-5000, or IWD-5000 following welded repairs or installation of replacement items by welding.
111. BASIS FOR RELIEF in past situations our utility has been required to defer or ask relief from ASME Section XI hydrostatic tests following repair or replacement activities due to various reasons, which identified a basis of impracticality. This has ranged from boundary valve isolation problems to incorporation of the steam generators in the test boundary. These situations have necessitated in some cases immediate communication with and approval from the NRC, so that start-up delays or LCO conditions could be avoided. Test deferrals, like those associated with the steam generator, eventually must be conducted, and are considered inordinately burdensome, considering that the ten-year hydrostatic tests have been eliminated for Class 1 and 2 systems with the approval in Regulatory Guide 1.147, Code Case N-498,
" Alternative Rules for 10-year Hydrostatic Pressure Testing for Class 1 and 2 Systems,Section XI, Division 1."
The Code has recognized that alternative rules should be available to hydrostatic testing to allow an option i
to the owner. They have developed Code Case N-416-1, Alternative Pressure Test Requirement for Welded Repairs or installation of Replacement items by Welding." This Code Case as of this writing has been passed by Section XI and has been sent up to Main Committee for approval. Accordingly, it is considered impractical to maintain only the hydrostatic option.
I l
1 of 2
a Serial No.93-435 i
RELIEF REQUEST SPT-15 (Continued):
IV. ALTERNATE TESTING In situations following welded repairs or installation of replacement items by welding, when the hydrostatic test required by IWA-4000 or IWA-5214 is not performed, the following alternative requirements shall be applied:
1)
NDE shall be performed in accordance with the methods and acceptance criteria of the applicable Subsection of the 1989 Edition of ASME Section Ill. Additionally, where no construction NDE is required on partial and full penetration welds greater than 1 inch t
nominal pipe size, these welds shall receive a surface examination as a minimum.
2)
Prior to or immediately upon return to service,' a VT-2 visual examination shall be performed in conjunction with a system pressure test, using the 1986 Edition of Section XI, in accordance with IWA-5000, at nominal operating pressure and temperature.
3)
Use of this alternative shall be documented on the NIS-2 Form.
If the original Code Case N-416 was used to defer a Class 2 hydrostatic test, the deferred test may be eliminated when the requirements of this alternative testing have been met.
2 of 2 c
.