ML18059A938
| ML18059A938 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 04/06/1994 |
| From: | Marsh L Office of Nuclear Reactor Regulation |
| To: | Fenech R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML18059A939 | List: |
| References | |
| TAC-M88874, NUDOCS 9404180192 | |
| Download: ML18059A938 (3) | |
Text
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I UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Docket No. 50-255 Mr. Robert A. Fenech Vice President, Nuclear Operations Consumers Power Company Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043
Dear Mr. Fenech:
April 6, 1994
SUBJECT:
PALISADES PLANT - SAFETY EVALUATION OF OVERLAY REPAIRS OF CONTAINMENT SUMP CHECK VALVES (TAC NO. M88874)
By letter dated March 6, 1994, Consumers Power Company (CPCo) reported a leak in a 24-inch austenitic stainless steel containment sump check valve (CK-ES3166) and requested approval for the use of Code Case N-504-1 weld overlay repair for the leaking valve and the corresponding valve (CK-ES3181) in the alternate train.
In the submittal, CPCo included a root cause analysis for the leaking valve, a flaw stability calculation, the repair plan, design calculations, and drawings for the repair.
CPCo requested staff approval for using an alternative to the ASME Boiler and Pressure Vessel Code,Section XI requirements under 10 CFR 50.55a(a)(3)(i). Specifically, CPCo proposed using Code Case N-504-1, unapproved by the staff, as an alternative providing an acceptable level of quality and safety. Under this Code case, CPCo is repairing defects in check valves by weld overlays.
The staff has reviewed the *request and concludes that CPCo's alternative repair will provide an acceptable level of quality and safety and, therefore, authorizes its use pursuant to 10 CFR 50.55a(a)(3)(i).
The basis for our findings and conditions are provided in the enclosed safety evaluation.
In view of the fact that the NRC requires certain information from licensees who perform similar overlay repairs under Generic Letter 88-01, "NRC Position on IGSCC t~ BWR Austenitic Stainless Steel Piping," CPCo should document the as-deposite_d,Jerrite content, the as-built overlay thickness, and an analysis of the shrHfkage stresses done according to the criteria of Code Case N-504-1.
CPCo shouJd:"-also send its written commitment to inspect these valves every refueling outage using ultrasonic techniques demonstrated to be effective.
This requested information and the commitment should be submitted within 30 days of completing the current forced outage.
9404180192 940406 ~
PDR ADOCK 050002~5 I
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Mr. Robert April 6, 1994 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.
Enclosure:
Safety Evaluation cc w/enclosure:
See next page DISTRIBUTION; Docket File NRC & LPDRs PD31 Rdg File WRussell/FMiraglia LReyes OPA LMarsh RHermann cc: Plant Service List OFF! CE LA: PD3 l NAME CJamerson DATE 3 /25/94 OFFICIAL RECORD COPY ERossi JLieberman JRoe JZwol inski AHsia LMiller, RIII WDean OC/LFDCB Sincerely, Original signed by John B. Hickman for:
i Ledjard B.- Marsh, Di rector I
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Office of Nuclear Reactor Regulation CJamerson OGC EJordan GHil 1, Pl-22 (2)
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1 Mr. Robert A. Fenech Consumers Power Company cc:
Mr. Thomas J. Palmisano Plant General Manager (Acting)
Palisades Plant 27780 Blue Star Memorial Highway Covert, MI 49043 Mr. David W. Rogers Plant Safety and Licensing Director Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 M. I. Miller, Esquire Sidley & Austin 54th Floor One First National Plaza Chicago, Illinois 60603 Mr. Thomas A. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, Illinois 60532-4351 Jerry Sarno Township Supervisor Covert Township
- 36197 M-140 H;igh.way Covert, Michigan~ 49043 Office of the Governor Room 1 - Capitol Building Lansing, Michigan 48913 U.S. Nuclear Regulatory Commission Resident Inspector Office
.Pali sades Pl ant 27782 Blue Star Memorial Highway Covert, Michigan 49043 Palisades Plant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health Department of Public Health 3423 N. Logan Street P. 0. Box 30195 Lansing, Michigan 48909 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 2300 N Street, N. W.
Washington DC 20037 Alora Davis Commitment Tracking System Coordinator Palisades Plant Consumers Power Company 27780 Blue Star Memorial Hwy.
Covert, Michigan 49043-9530
'March 1994