ML20207H145
| ML20207H145 | |
| Person / Time | |
|---|---|
| Issue date: | 06/09/1999 |
| From: | Strosnider J NRC (Affiliation Not Assigned) |
| To: | Terry C NIAGARA MOHAWK POWER CORP. |
| Shared Package | |
| ML20207H150 | List: |
| References | |
| TAC-M99898, NUDOCS 9906140336 | |
| Download: ML20207H145 (6) | |
Text
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NUCLEAR REGULATORY COMMISSION I WASHINGTON, D.C. 20066 4 001
%, . . . . . p# June 9, 1999 Carl Terry, BWRVIP Chairman Niagara Mohawk Power Company Post Office Box 63 Lycoming, NY 13093
SUBJECT:
SAFETY EVALUATION OF THE BWRVIP VESSEL AND INTERNALS PROJECT, *BWRVIP VESSEL AND INTERNALS PROJECT, UNDERWATER WELD REPAIR OF NICKEL ALLOY REACTOR VESSEL INTERNALS (BWRVIP-44)," EPRI REPORT TR 108708, SEPTEMBER 1997 (TAC NO.
M99898)
Dear Mr. Teny,
The NRC staff has completed its review of the Electric Power Research Institute (EPRI) proprietary report TR-108708, "BWRVlP Vessel and Intemals Project, Underwater Weld Repair of Nickel Alloy Reactor VesselIntemals (BWRVIP-44)," September 1997. This report was submitted by letter dated October 27,1997.
The BWRVIP-44 report provides the technical basis for utilizing the underwater wet flux-core arc welding process in repairing reactor intemal components at a water depth of up to 50 feet without an environmental chamber. This welding procedure would provide high-quality repair of Alloy 600 and Type 304 stainless steel welds in limited access locations. The report presents information on the modifications needed in the welding power supply and that a gas shleiding technique would be needed to achieve acceptable results at the maximum depth.
Subsequently, a qualification program was conducted to establish that the welds met the acceptance criteria of the American Society of Mechanical Engineers (ASME) Code Case N-516, " Underwater Welding,"Section XI, Division 1. Finally, a demonstration program was carried out to confirm that the technique could be used to repair welds in the fillet, overlay and V-groove configurations.
The NRC staff has reviewed the BWRVIP-44 report and finds that the results of the I qualification and demonstration tests indicate that the flux-core process is a viable technique for weld repair of stainless steel and Alloy 600 components at depths up to 50 feet, except where the staff's conclusions differ from the BWRVIP's, as discussed in the enclosed Safety Evaluation (SE). The results of the licensee's welding procedure are acceptable because it gQ followed the Code acceptance criteria established in Code Case N-516 and Section IX of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,
" Welding and Brazing Qualifications." The concems regarding welding of irradiated materials that are a condition to the use of Code Case N-516 are addressed separately as a part of BWRVIP-45, "Weldability of irradiated LWR Structural Components."
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The staff requests that the BWRVIP review and resolve the issues raised in the enclosed SE, and incorporate the staff's conclusions into a revised BWRVIP-44 report. Please inform the staff within 90 days of the date of this letter as to your proposed actions and schedule for such revisions.
. Plea' se contact C. E. (Gene) Carpenter, Jr., of my staff at (301) 415-2169 if you have any further questions regarding this subject.
Sincerely of Jack R. Strosnider, Director Division of Engineering Office of Nuclear Reactor Regulation
Enclosure:
As stated cc: See next page 1
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Carl Terry The staff requests that the BWRVIP review and resolve the issues raised in the enclosed SE, and incorporate the staff's conclusions into a revised BWRVIP 44 report. Please inform the staff within 90 days of the date of this letter as to your proposed actions and schedule for such revisions.
Please contact C. E. (Gene) Carpenter, Jr., of my staff at (301) 415-2169 if you have any further questions regarding this subject.
Sincerely OKiGitat sic;mai. e:
Jack R. Strosnider, Director s Division of Engineering Office of Nuclear Reactor Regulation i
Enclosure:
As stated cc: See next page i Distribution:
File Center JRRajan MEMayfield WLanning, R1 EMCB R/F GHolahan EHackett BMallet, R2 PUBLIC KAKavanagh TYChang JGrobe. R3 ACRS TMisra AHowell, R4 DOCUMENT NAME: G:\BWRVIP\ VIP 44SE.WPD
- See Previous Concurrence NDICATE N BOX:"C' COPY W/O ATTACHMENTENCLOSURE.*E*= COPY W/ATTENCL,T NO COPY EMCB: LPM E EMCB:SLS E EMCB:SC E EMCB:BC E CECarpenter* RAHermann* KRWichman* WHBateman*
04/28/1999 04/28/1999 04/29/1999 04/29/1
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Carl Terry The staff requests that the BWRVIP review and resolve the issues raised in the enclosed SE, and incorporate the staff's conclusions into a revised BWRVIP-44 report. Please inform the staff within 90 days of the date of this letter as to your proposed actions and schedule for such revisions.
Please contact C. E. (Gene) Carpenter, Jr., of my staff at (301) 415-2169 if you have any further questions regarding this subject. i Sincerely ORIGINAL GCliES D:
Jack R. Strosnider, Director Division of Engineering Office of Nuclear Reactor Regulation .
Enclosure:
As stated !
cc: See next page j Distribution:
File Center JRRajan MEMayfield WLanning, R1 EMCB R/F GHolahan EHackett BMallet, R2 PUBLIC KAKavanagh TYChang JGrobe. R3 ACRS TMisra AHowell, R4 DOCUMENT NAME: G:\BWRVIP\ VIP 44SE.WPD
- See Previous Concurrence NDICATE N BOX:"C"= COPY W/O ATTAOHMENTENCLOSURE, *E*=OOPY W/ATTENCL,"N'=NO COPY '
EMCB: LPM E EMCB:SLS E EMCB:SC E EMCB:BC E
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CECarpenter* RAHermann* KRWichman* WHBateman* , )
04/28/1999 04/28/1999 04/29/1999 04/29/1 mmmmmm ME EMEB:BC E SRXB:BC E DE:DD E DE:D E Elmbro* JWermiel* RHWessman* JRStros%r 05/11/1999 05/12/1999 05/15/1999 06/T /M99 OFFICIAL RECORD COPY
Carl Terry. 2-l Please contact C. E. (Gene) Carpenter, Jr., of my staff at (301) 415-2169 if you have any l further questions regarding this subject.
Sincerely l
l Jack R. Strosnider, Director.
Division of Engineering Office of Nuclear Reactor Regulr%n
Enclosure:
As stated' cc: See next page i
Distribution:
File Center JRRajan MEMayfield WLanning, R1 EMCB R/F GHolahan EHackett BMallet, R2 PUBLIC KAKavanagh TYChang JGrobe. R3 ACRS TMisra - AHowell, R4 DOCUMENT NAME: G:\BWRVIPWIP44SE.WPD INDICATE IN 90X:"C"= COPY W/O ATTACHMENT 4NCLO9URE, *E"= COPY W/ATT/ ENCL,"N"mNO CO*Y OPPICE EMCB:DE - h EMCB:DE '- f BC:EMCBCM NAME' CECA RAHermann M WHBate DATE jf / 28/99 ?
4 /j [ /99 47/99 ormCE N:'E B:bE BC:GBXS$SSA DD:DE 7 D:DE NAME 'Elmbro JWe RHW M JRStrosnider DATE: ff///99- f/ /[/99 &\b b / 6 /99 / /99 OFFICIAL RECORD COPY 4g
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, cc:
Karl W. Singer, Executive Chair ' Steve Lewis, Technical Chairman BWRVIP Assessment Task BWRVIP Assessment Task Tennessee Valley Authority Entergy PO Box 2000 P. O. Box 756 Decattur, AL 35602-2000 Waterloo Road Port Gibson, MS 39150
= Bill Eaton, Executive Chair - i
, inspection Committee -
Carl Larsen, Technical Chairman ,
Entergy Operations, Inc.
BWRVIP Inspection Task '
PO Box 756, Waterloo Rd Yankee Atomic Port Gibson, MS 39150-0756 : 580 Main Street Bolton, MA 01740 H. Lewis Sumner, Executive Chairman -
BWRVIP Mitigation Task John Wilson, Technical Chairman Southem Nuclear Operating Co. BWRVIP Mitigation Task M/S BIN B051, PO Box 1295 Clinton Power Station, M/C T-31C ,
40 invemess Center Parkway . P.O. Box 678 i Birmingham, AL 35201 Clinton,IL 61727 Harry P. Salmon, Executive Chairman Vaughn Wagoner, Technical Chairman BWRVIP Integration Task BWRVIP Integration Task New York Power Authority Carolina Power & Light Company 123 Main St., M/S 11 D One Hannover Square 9C1 White Plains, NY 10601-3104 P.O. Box 1551 Raleigh, NC 27612 George T. Jones, Executive Chair BWRVIP Repair Task Bruce McLeod, Technical Cnalrman Pennsylvania Power & Light, Inc. B'NRVIP Repair Task M/S GEN A 61 Southem Nuclear Operating Co.
2 N 9* Street Post Office Box 1295 Allentown, PA 18101-1139 40 inverness Center Parkway Birmingham, AL 35201 Robert Carter, EPRI BWRVIP Assessment Manager Warren Bilanin, EPRI BWRVIP EPRI NDE Center integration Manager i P. O. Box 217097 Raj Pathania. EPRI BWRVIP 1300 W. T. Harris Blvd. Mitigation Manager '
Charlotte, NC 28221 Ken Wolfe, EPRI BWRVIP Repair Manager Greg Selby, EPRI BWRVIP Electric Power Research institute inspection Manager P. O. Box 10412 EPRI NDE Center 3412 Hillview Ave.
P. O. Box 217097 - Palo Alto, CA 94303 1300 W. T. Harris Blvd. .
Charlotte, NC 28221 James P. Pelletier, BWRVIP Liaison to EPRI Nuclear Power Council Joe Hagan, BWRVIP Vice Chairman Nebraska Public Power District PEPCO Energy Co. 1200 Prospect Avenue
- MC 62C-3 PO Box 98 965 Chesterbrook Blvd Brownville, NE 68321-0098 Wayne, PA 19807-5691
.