ML15218A250
| ML15218A250 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/21/1991 |
| From: | Matthews D Office of Nuclear Reactor Regulation |
| To: | Tuckman M DUKE POWER CO. |
| References | |
| TAC-79191, NUDOCS 9102250159 | |
| Download: ML15218A250 (3) | |
Text
February 21, 1991 Docket No. 50-270 Distribution See attached list Mr. M. S. Tuckman Vice President Nuclear Operations Duke Power Company P. 0. Box 1007 Charlotte, North Carolina 28201-1007
Dear Mr. Tuckman:
SUBJECT:
REQUEST FOR RELIEF FROM SECTION XI ASME CODE REQUIREMENTS FOR OCONEE NUCLEAR STATION, UNIT 2 (TAC 79191)
In a letter dated December 3, 1990, you requested relief from certain requirements of Section XI of the ASME Code for the Oconee Nuclear Station, Unit 2. The relief request regarded a pinhole leak on a one-inch socket weld pipe cap downstream of valve 2FDW-37. The pipe cap is an ASME Code Class 2 component and a Code repair at this time would require an undesired plant shutdown. The leak has been repaired temporarily by the use of a non-ASME Code engineered mechanical clamp with injection of sealing material. A permanent repair in compliance with ASME code requirements will be performed during the next cold shutdown of Unit 2. The temporary repair was verbally approved by the NRC staff on November 29, 1990.
The staff review of your request concluded that the interim repair is acceptable on the basis that the ASME Code repairs are impractical while the unit is operating and the mechanical clamp was designed with adequate load-bearing capability and that the sealing material is effective for interim leak tight purposes. However, an ultrasonic examination of the adjacent pipe wall should be performed to ensure that no severe deterioration exists beyond the pipe cap region. With this condition, relief from the repair requirements for the specified pipe cap is granted until the next cold shutdown pursuant to 10 CFR 50.55a(g)(6)(i).
This relief is authorized by law and will not endanger life or property or the common defense and security and is otherwise in the public interest given due consideration to the burden that could result if the requirements were imposed on your facility.
Sincerely, David B. Matthews, Director Project Directorate 11-3 Division of Reactor Projects -
I/II Office of Nuclear Reactor Regulation cc:
See next page See previous con u ce *
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Mr. M.S. Tuckman Oconee Nuclear Station Duke Power Company Units Nos. 1, 2 and 3 CC:
Mr. A.V. Carr, Esq.
Mr. Stephen Benesole Duke Power Company Duke Power Company 422 South Church Street Post Office Box 1007 Charlotte, North Carolina 28242-0001 Charlotte, North Carolina 28201-1007 J. Michael McGarry, III, Esq.
Winston and Strawn Mr. Alan R. Herdt, Chief 1400 L Street, N.W.
Project Branch #3 Washington, D.C. 20005 U.S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Mr. Robert B. Borsum Atlanta, Georgia 30323 Babcock & Wilcox Nuclear Power Division Ms. Karen E. Long Suite 525 Assistant Attorney General 1700 Rockville Pike N. C. Department of Justice Rockville, Maryland 20852 P.O. Box 629 Raleigh, North Carolina 27602 Manager, LIS NUS Corporation Mr. R.L. Gill, Jr.
2650 McCormick Drive, 3 Floor Nuclear Production Department Clearwater, Florida 34619-1035 Duke Power Company P.O. Box 1007 Senior Resident Inspector Charlotte, North Carolina 28201-1007 U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Supervisor of Oconee County Walhalla, South Carolina 29621
Distribution for Relief Request No. 90-06:
Facility: Oconee Nuclear Station, Unit 2 Docket File NRC & Local PDRs PDII-3 R/F Oconee R/F S. Varga 14-E-4 G. Lainas 14-H-3 D. Matthews 9-H-3 R. Ingram 9-H-3 L. Wiens 9-H-3 OGC 15-B-18 ACRS (10)
P-315 GPA/PA 17-F-2 OC/LFMB MNBB 4702 J. Wechselberger 17-G-21