ML17262A671
| ML17262A671 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 11/27/1991 |
| From: | Andrea Johnson Office of Nuclear Reactor Regulation |
| To: | Mecredy R ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| IEB-89-001, IEB-89-1, TAC-M73172, NUDOCS 9112100209 | |
| Download: ML17262A671 (6) | |
Text
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Docket No. 50-244 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 27, 1991 Dr. Robert C. Mecredy, Vice President Ginna Nuclear Production Rochester Gas 5 Electric Corporation
'9 East Avenue Rochester, New York 14649
Dear Dr. Mecredy:
SUBJECT:
RE(VEST FOR ADDITIONAL INFORMATION (RAI) -
NRC BULLETIN 89-01, SUPPLEMENT 2, "FAILURE OF WESTINGHOUSE STEAM GENERATOR TUBE MECHANICAL PLUGS" - R.
E.
GINNA NUCLEAR POWER PLANT (TAC NO. M73172)
On June 28, 1991, NRC Bulletin 89-01; Supplement 2 was issued to all holders of operating licenses or construction permits for pressurized water reactors (PWRs).
The bulletin requested that actions similar to those requested in NRC Bulletin 89-01, "Failure of Westinghouse Steam Generator Tube Mechanical Plugs,"
be extended to include all Westinghouse mechanical plugs fabricated from thermally treated Inconel 600.
These actions were necessary to ensure that these plugs would continue to provide adequate assurance for reactor coolant system (RCS) pressure boundary integrity under normal operating, transient, and postulated accident conditions.
Your response to Bulletin 89-01, of June 21, 1989, verified a review of information provided by Westinghouse in WCAP-12244, Revision 1, and Reference 2
of Bulletin 89-01.
We understand from your response letter of June 21, 1989, that no Inconel 600 mechanical plugs from heat batches,
- 3279, 3513,
- 3962, and 4523 (group 1 heats) are installed in the Ginna steam generators (SG's).
No response was required to Bulletin 89-01, Supplement 1, of November 14, 1990, which identified reports of instances of primary water stress corrosion cracking (PI'SCC) at other plants affecting other heats (group 2 heats).
Bulletin 89-01, Supplement 2, of July 29, 1991, requested similar actions to that of Bulletin 89-01 for group 2 heats identified in Westinghouse WCAP-12244, Revision 3, Addendum 2.
As you reported, out of a total of 176 Westinghouse mechanical Inconel 600 plugs still installed, only 89 have life expectancy less than the full 40-year plant life (2009),
and are located in SG No.
B hot leg.
Forty Inconel 600 plugs must be removed by the 1996 refueling outage (RO) and 49 plugs by the 1998 RO.
These plug lifetimes have been determined by your analysis using actual cycle burn-up data and estimating the remaining plug life in effective full power days (EFPDs).
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'r. Robert C. Mecredy November 27, 1991 Because the correlation for SG mechanical plug operating life, which was developed by Westinghouse for various heats of plugs installed, differs from the EFPD operating life for plugs installed at Ginna, please submit your re-calculations and methodology.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore,;,OMB clearance is not required under P. L.96-511.
Sincerely, 1
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See next page Original signed by Allen R. Johnson, Project Manager
'roject Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation DISTRIBUTION: Docket-File,50-244, NRCSLocal
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GINNA RAI LTR. TAC M73172
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- "Dr. Robert C. hiecredy Ginna CC:
Thomas A. tioslak, Senior Resident Inspector R.E. Ginna Plant U.S. Nuclear Regulatory Commission 1503 Lake Road
- Ontario, New York 14519 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 t!s.
Donna Ross Division of Policy Analysis 5 Planning Hew York State Energy Office Agency Building 2
Empire State Plaza
- Albany, New York 12223 Charlie Donaldson, Esq.
Assistant Attorney General New York Department of Law 120 Broadway New York, New York 10271 Nicholas S.
Reynolds Winston 8 Strawn 1400 L St.
N.M.
Washington, DC 20005-3502 Hs.
Thelma Wideman
- Director, Wayne County Emergency management Office Wayne County Emergency Operations Center 7370 Route 31
- Lyons, New York 14489 ths.
Susan Perry Administrator, Monroe County Office of Emergency Preparedness 111 West Fall Road Rochester, New York 14620
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