ML20002D582
| ML20002D582 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 01/05/1981 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Schwencer A, Varga S Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8101210402 | |
| Download: ML20002D582 (2) | |
Text
f, Alabama Power Company 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291 Telephone 205 250-1000 m
F. L. CLAYTON, JR.
senior Vice President Alabama Power the southern elecinc nstem January 5, 1981 Docket No. 50-348 No. 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Conrnission Phillips Building, Room 116 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention: Mr. S. A. Varga Mr. A. Schwencer Gentlemen:
Joseph M. Farley Nuclear Plant - Units 1 and 2 Containment Purge Valve O'perability As stated in our letter to Mr. Schwencer dated December 19, 1980, the solenoid valves, ASCO Model No. HTX8316C15E, presently associated with the 18-inch containnent mini-purge valves, were determined not to have sufficient qualification documentation. Thase solenoid valves are used on containment mini-purge isolation valves and perform their safety function prior to the effects due to the accident environment.
In the unlikely event of failure, the isolation of these valves would be maintained and such failure would not adversely affect other safety-related equipment. Furthermore, these solenoid valves have high tempera-ture coils and contain no Buna-N or plastic parts. Complete qualifica-tion testing or analyses have not been performed on individual assemblies; however, separate qualification tests have been performed on individual constituent components of the valve assembly. Based on the fact that no l
materials which would experience deleterious effects due to harsh environ-ments are included in these valves, and that previous limited testing has successfully verified qualification, interim use of these valves has been i
determined to be acceptable until they can be replaced. These solenoid valves will be replaced with ASCO Model No. NP831654V valves which are designed and certified by the manufacturer to be environmentally and seismically qualified for the accident conditions postulated at Farley N
Nuclear Plant. The replacement valves maet the performance requirements L
of IEEE 323-74, IEEE 382-72, and IEEE 344-75. Replacement with valves 7 0 having sufficient _ documentation will be completed by June 30, 1982.
If 4
any problems arise beyond the control of Alabama Power Company which impact this schedule, the NRC will be notified. A replacement program to fully support this schedule has been implemented and appropriate design changes and purchase orders already have been issued.
0 81012104M.
1 Director, Nuclear Reactor Regulation January 5, 1981 U. S. Nuclear Regulatory Commission Page 2 The air actuators used on the 18-inch mini-purge valves, Bettis Model No. T-3128-SR3-M3-12 have been determined by Bettis to be generically equivalent to Bettis actuator Model No. T-3128-SR3 which has been seismically qualified in accordance with IEE 344-1971 requiremc ts. The Bettis Model No. T.3128-SR3-M3-12 actuators have been environmentally qualified for inside containment following a design basis accident. This environmental qualification program was based on materials qualification rather than test-excess of 1 x 10ged prototype operator and included radiation levels in ing of an asserab rads,100% relative humidity, exposure to containment 0
spray, and a temperature in excess of 300 F.
The only elastomeric parts on the Bettis operators are the actuator seals. Bettis recommends replacement of the actuator seal kits on a regular basis with intervals not to exceed five years. This five year replacement cycle is based on industry standards for minimizing mainte-nance work and associated equipment down time.
Even though the. replace-ment interval is not required to maintain a qualified material design life, Alabama Power Company will conform to the five year replacement schedule for the actuator seals.
If you have any questions, pleash advise.
Yours ver,.
ly, b[/ k [%/
.g F. L. Clayton, Jr.
RWS:de cc: Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. E. A. Reeves Mr. L. L. Kintner Mr. W. H. Bradford i
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