ML18153C416
| ML18153C416 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 10/29/1990 |
| From: | Berkow H Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 9011060261 | |
| Download: ML18153C416 (3) | |
Text
e e
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket Nos. 50-280, 50-281 50.-338 and 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:
October 29, 1990
SUBJECT:
SURRY, UNITS 1 AND 2 - NORTH ANNA UNITS 1 AND 2 RE:
AUTHORIZATION OF USE OF ALLOY 690 AS ALTERNATIVE TO USE OF ALLOY 600 FOR STEAM GENERATOR TUBE PLUGS PER 10 CFR 50.55a(a)(3)
By letter dated August 22, 1990, you requested approval, pursuant to 10 CFR 50.55a(a)(3), for the use of steam generator tube plugs fabricated of nicket-chromium-iron UNS N-06690 material (Alloy 690) to plug steam generator tubestat NA-1&2 and Surry-1&2 for both mechanical and welded applications.
i Code Case N-474-1 of the ASME Boiler and Pressure Vessel Code (approval date March 5, 1990) addresses Alloy 690 material and authorizes its use in other forms for the construction of Section III, Division I, Class 1 components.
The material is specified in ASME Code,Section II, material specifications SB-163, SB-166, SB-167 and SB-168. Also, Alloy 690, in tubing form (SB-163),
was previously authorized for construction of Class 1 components.
The staff has determined that the use of Alloy 690 for tube plugs as a proposed alternative to the use of Alloy 600, in accordance with.the requirements of the ASME Boiler and Pressure Vessel Code, will provide an acceptable level of quality and safety *. The use of Alloy 690 material for the fabrication of mechan-ical plugs for steam generator tubes was endorsed by the NRC in NRC Bulletin No. 89-01, "Failure of Westinghouse Steam Generator Tube Mechanical Plugs,"
dated May 15, 1989. Alloy 690 has superior anti-corrosion properties and similar mechanical properties to the Alloy 600 material previously used-for tube plugs *. The design stress intensity stipulated by the Code Case and used in the design and qualification of the tube plugs is the same for Alloy 690 material as *for Alloy 600 material of the same form.
Therefore, this material is being used in the fabrication of tube plugs which may be utilized in the steam generators at NA-1&2 and Surry-1&2.
In accordance with the provisions of Footnote 6, Section 50.55a of 10 CFR, we authorize the use of this specific Code Class for applications not precluded by regulatory or other requirements or by recommendations in NRC Regulatory Guides. It is the responsibility of the user to make certain that no regulatory requirements are violated and that there are no conflicts with other recommended limitations resulting from Code Case usage *
. ~-.t
....., "'~1 !:._;IJ"i~--,;:-:,~~--1
-~~~T/.(~/.\\ 901029
(
90110.:, J:.:. ~.
- i)~:i(H)02E:O
)
~fiR ADOCK PDC I
P
e Mr. W. October 29, 1990 We have reviewed your request and supporting information and conclude that the use of Alloy 690 as a proposed alternative to the use of Alloy 600, will provide an acceptable level of quality and safety and, therefore, its use for plugs to plug tubes in steam generators is authorized under the provisions of 10 CFR 50.55a(a)(3).
cc: See next page DI STR I B.UTI.Ol'l r:::npcke{t,: Fi'*fe-1
'*-NRC & LPDRs PD22 Rdg Fi1e TMurley/FMiragia 12/G/18 JPartlow 12/G/18 CRossi 11/E/4 SVarga GLainas LEngle BBuckley OGC ACRS(10)
GHi 11 ( 16)
GPA/PA OC/LFMB RBorchardt 17/G/21 MSinkule RII Sincerely, Original signed by Herbert N. Berkow, Director Project Directorate II-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation OFC ___ :LA:PDII-2
- PM~~3:M::
- PM:P~f6 _____ :EMCB
- OG
- D:PDII-2
=~1J.iA*A--------=-~~-----=-----r~{7---=-------~c--=~~~.
=-~---
NAME --~D~=~***-**-----~ LE-------d ____ ~ BBuc _ ley ------~ CYCheng __
---~ /Jl/t, a~ ---~ H _er--------
DATE
- 10/~1f90
- 10/11/90
- 10/~(J; /90
- 10// g>;go
- 10 * /.,/9CY
- 10.QJ /90
-- ----OFFICIAL-RECORD COPY------- ---*-----~-------
Document Name:
NA1&2/SURRY 1&2 10 CFR 50.55A
- l.
North Anna Power Station, Units 1&2 Surry Power Station, Units 1&2 cc:
Mr. William C. Porter, Jr.
County Administrator Louisa County P.O. Box 160 Louisa, Virginia 23093 Michael W. Maupin, Esq.
Hunton and Williams P. 0. Box 1535 Richmond, Virginia 23212 Mr. W. T. Lough Virginia Corporation Commission Division of Energy Regulation P. 0. Box 1197 Richmond, Virginia 23209 Old Dominion Electric Cooperative c/o Executive Vice President Innsbrook Corporate Center 4222 Cox Road, Suite 102 Glen Allen, Virginia 23060 Mr. W. L. Stewart Senior Vice President - Power Virginia Electric and Power Co.
Post Office Box 26666 Richmond, Virginia 23261 Mr. Patrick A. O'Hare Office of the Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219 Senior Resident Inspector North Anna Power Station U.S. Regulatory Connission Route 2, Box 78 Mineral, Virginia 23117 Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219 C. M. G. Buttery, M.D., M.P.H.
Department of Health 109 Governor Street Richmond, Virginia 23219 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, Georgia 30323 Mr. G. E. Kane, Manager North Anna Power Station P. 0. Box 402 Mineral, Virginia 23117 Mr. W.R. Cartwright Vice President - Nuclear Virginia Electric and Power Company 5000 Dominion Blvd.
Glen Allen, Virginia 23060 Mr. Michael Kansler, Manager Surry Power Station Post Office Box 315 Surry, Virginia 23883 Senior Resident In~ector Surry Power Station U.S. Nuclear Regulatory Conmission Post Office Box 166, Route 1 Surry, Virginia 23883 Mr. Sherlock Holmes, Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683