ML15224B026
| ML15224B026 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/02/1986 |
| From: | Miraglia F Office of Nuclear Reactor Regulation |
| To: | Gibson A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML15224B027 | List: |
| References | |
| NUDOCS 8609110336 | |
| Download: ML15224B026 (3) | |
Text
Dockets No.
50-269, 50-270 SEP 2 1986 and 50-287 MEMORANDUM FOR: Albert F. Gibson, Director Division of Reactor Safety, Region II FROM:
Frank J. Miraglia, Director Division of PWR Licensing-B
SUBJECT:
COMPATIBILITY OF DIFFERENT TYPES OF GREASE IN LIMITORQUE VALVE OPERATORS: TIA 86-26FM DATED JUNE 26, 1986
REFERENCE:
Oconee Nuclear Station, Units 1, 2 and 3 In aletter dated June 26, 1986, (TIA 86-26FM) you requested that we evaluate the compatibility of different types of grease used by Duke Power Company in the Limitorque valve operators at the Oconee Nuclear Station, Units 1, 2 and
- 3. Our evaluation is based on the information submitted to you by Duke Power Company in.response to concerns regarding operability of safety-related motor operated valves (MOVs) with unqualified lubrication. We conclude that the two types of grease used in Oconee's Limitorque valve operators are compatible and their mixture will withstand exposure to the post-accident environment, without rapid degradation.
Limitorque motor-operated valves are used at Oconee to isolate the containment building during an accident. To accomplish this function, the valves must remain operable in the high radiation environment which may exist in the containment after an accident. Originally, the gearing mechanisms in these valves were lubricated with Exxon Nebula EP grease which was recommended by the valve manufacturer as an environmentally qualified lubricant. However, during subsequent maintenance of.the valve operators, another type of grease was introduced and as a result, a mixture of two greases was formed. The other grease, Texaco Marfak 0, is not environmentally qualified for nuclear application. We address the two concerns which arise with regard to the Nebula/Marfak grease mixture, i.e. 1) Are the two greases compatible and
- 2) will the grease mixture survive a post-accident environment?
We concur with the valve manufacturer's recommendation that changing the grease in the MOV operators to the qualified type is required for final compliance with equipment qualification requirements. However, we believe that in the interim, plant safety has been demonstrated and the licensee may be allowed to replace the grease during each unit's scheduled refueling outages. Furthermore, we concur with the licensee's consultant, that in the 8609110336 860902 PDR ADOCK 05000269 P
meantime, periodic inspection of the lubricant in the valve operator gear cases should be performed to verify its adequacy.
With the enclosed safety evaluation, we have completed our efforts on TIA 86-26FM.
Original signed bY Frank J. Miraglia, Frank J. Miraglia, Director Division of PWR Licensing-B
Enclosure:
As stated cc w/enclosure:
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Mr. H. B. Tucker Oconee Nuclear Station Duke Power Company Units Nos. 1, 2 and 3 cc:
Mr. William L. Porter Mr. Paul F. Guill Duke Power Company Duke Power Company P. 0. Box 33189 Post Office Box.33189 422 South Church Street 422 South Church Street Charlotte, North Carolina 28242 Charlotte, North Carolina 28242 J. Michael McGarry, III, Esq.
Bishop, Liberman, Cook, Purcell & Reynolds 1200 Seventeenth Street, N.W.
Washington, D.C. 20036 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Regional Administrator U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.
Suite 3100
- Atlanta, Georgia 30303 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 Honorable James M. Phinney County Supervisor of Oconee County Walhalla, South Carolina 29621