ML20056D934
| ML20056D934 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/29/1993 |
| From: | Engle L Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| GL-92-01, GL-92-1, TAC-M83488, TAC-M83489, NUDOCS 9308190027 | |
| Download: ML20056D934 (5) | |
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S UNITED STATES 2
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wAsmuotow. o.c. 20ssseos July 29,1993 Docket Nos. 50-338, 50-339 Mr.
W.
L.
Stewart Senior Vice President - Nuclear Virginia Electric and Power Company 5000 Dominion Blvd.
Glen Allen, Virginia 23060
Dear Mr. Stewart:
SUBJECT:
NORTH ANNA UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION - GENERIC LETTER 92-01, REVISION 1 (TAC NOS. M83488 AND M83489)
In conducting our review of your June 29, 1992, _ submittal-relating to the above subject at North Anna Units 1 and 2, we have determir.ed that we will need additional information identified in the enclosure to continue our review.
In order for us to maintain our review schedule, your response is requested within 60 days of the date of this letter.
If you cannot provide a full response within the requested time, please provide your full response schedule within 60 days of the date of this letter.
The information requested by this letter is within the scope of the overall burden estimated in Generic Letter 92-01, Revision 1,
" Reactor Vessel Structural Integrity, 10 CFR 50. S4 ( f). "
The estimated average number of burden hours is 200 person hours for each adressee's response.
This estimate pertains only to the identified response-related matters and does not include the time 1
required to implement actions required by the regulations.
This action is covered by the Office of Management and Budget Clearance Number 3120-0011, which expires June 30, 1994.
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_2-t Please contact me at (301) 504-1480 if you have any questions concerning this letter.
Sincerely, (Original Signed By)
Leon B.
Engle, Project Manager Project Directorate II-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
As stated cc w/ enclosure:
See next page Distribution
' Docket"Fils-NRC & Local PDRs PDII-2 RF S.
Varga G.
Lainas H.
Berkow E.
Tana L.
M.
Sinkule, RII OFC LA:PDII-2 PM:PDII-2 D:@JIr2 NAME ETana[yf LErh HB E
OFFICIAL RECORD. COPY '
7 /24/93 DATE 7/c44/93 7/$/93 FILENAME. G:RAI.NA
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-Mr.:W. L.~ Stewart North Anna Power Station Virginia Electric & Power' Company-Units 1 and 2 f
CC" Mrc William C. Porter, Jr.
Robert B. Strobe, M.D., M.P.H.
County Administrator State Health Commissioner :
Louisa County Office of the-Commissioner P.O. Box 160 Virginia Department ofLHealth_
.j Louisa, Virginia 23093 P.O. Box 2448 Richmond, Virginia 23218 1
' Michael W. Maupin, Esq.
i Hunton and Williams Regional-Administrator, RII Riverfront Plaza, East Tower U.S. Nuclear Regulatory Commission 951 E. Byrd Street 101 Marietta Street, N.W.,
Suite'2900' i
Richmond, Virginia 23219 Atlanta, Georgia -30323 Dr. W. T. Lough Virginia State Corporation Commission Mr. G. E. Kane, Manager
~ Division of Energy Regulation North Anna Power Station P.O. Box 1197 P.O. Box 402 Richmond, Virginia 23209 Mineral, Virginia 23117 '
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Old Dominion Electric Cooperative 4201 Dominion Blvd.
_i Glen Allen, Virginia 23060 1
Mr. M. L. Bowling, Manager Nuclear Licensing & Programs
~ Virginia Electric and Power Company
-Innsbrook Technical Center 5000 Dominion Blvd.
l Glen Allen, Virginia' 23060 Office of the Attorney General Supreme. Court Building j
101 North 8th Street Richmond, Virginia 23219 j!
1 Senior. Resident Inspector North' Anna Power Station
~
U.S. Nuclear Regulatory Commission Route'2, Box'78 i
Mineral, Virginia 231172 t
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I ENCLOSURE i
NORTH ANNA 1 (TAC No. M83488)
Ouestion 2a in GL 92-01 i
The response to GL 92-01 indicates that the initial upper shelf energy (USE) value for forging 03 is 851ft-lb.
The staff believes that this initial USE value of 85 ft-lb for Forging 03 is from longitudinal Charpy specimens, mistakenly reported as from transverse Charpy specimens.
Two sources support this conclusion: Report WCAP-11791 documented 74 and 85 ft-lb as initial USE values for longitudinal and transverse specimens - a phenomenon contrary to other forging and plate data that the longitudinal USE value of a forging or plate should be
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larger than its transverse value; and, a North Anna'2 report, BAW-1794 (page A-3), listed USE values of a similar forging, forging 04, in exactly the reverse order.
Confirm this and update the EOL USE value for this forging.
If the s
updated EOL USE is below 50 ft-lb based on NRC criteria, then submit an analysis which demonstrates that lower values of USE will provide margins of safety against
.i fracture equivalent to those required by Appendix G of the ASME Code.
The response indicates that the initial USE values for forgings 04, 05, and weld 05B are not known; and the initial USE of 90 ft-lb for weld OSA is an estimated value.
Either provide the Charpy USE for each beltline material with no documented initial USE value or provide the Charpy USE and analysis from materials that were fabricated'using the same vendor, fabrication time frame, fabrication process, and material specification to demonstrate that all beltline materials with no documented initial ~USE values will meet the USE requirements of Appendix G, 10CFR 50.
If this cannot be provided,'then submit an analysis which demonstrates that lower values of USE will provide margins of safety against fracture equivalent.to those required by Appendix G of the ASME Code.
Ouestion'2b in GL 92-01 i
i The response reports two sets of chemical compositions for forging 03.
One is under the section labeled " Beltline Materials" and the other is under the section labeled
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" Surveillance Materials."
.Specify and provide justification for the selection of the chemical compositions that will be used in future ARTyg and AUSE calculations for this forging.
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' The response indicates that the sulfur content for beltline welds 05A and 05B is not known.
Confirm this, i
NORTH ANNA 2 (TAC No. M83489)
Question 2a in GL 92-01
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The response indicates that the initial USE values for welds 05A and 05B are not known.
Either provide the Charpy USE for each beltline weld with no documented initial USE value or provide the.Charpy USE and analysis from welds that were fabricated using the same vendor, fabrication time frame, fabrication process, and naterial specification 3
to demonstrate that all beltline welds with no documented initial USE values will meet the USE requirements of
~
Appendix G, 10CFR 50.
If this cannot be provided, then submit an analysis which demonstrates that lower values of USE will provide margins of safety against fracture equivalent to those required by Appendix G of the ASME Code.
Ques & ion 2b in GL 92-01 The response reports two sets of chemical compositions for forging 04.
One is under the section labeled " Beltline Materials" and the other is under the section labeled
" Surveillance Materials."
Specify and provide justification for the selection of the chemical compositions that will be used in future ARTe7 and AUSE calculations for this forging.
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