ML20032C554
| ML20032C554 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 10/30/1981 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8111100589 | |
| Download: ML20032C554 (4) | |
Text
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Malling Addrses Alabama Power Company 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291
. Telephone 205 783-6081 b
F. L. Clayton, Jr.
O?,'s'LTll"'
Alabama Pbwer d
the southern elettnc syskyn October 30, 1981 Docket No. 50-348 h
Docket No. 50-364 p
b
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t Novo 9;
.Q.s,MD k;S Director of Nuclear Reactor Regulation u
U. S. Nuclear Regulatory Commission
\\
Washington, D. C.
20555 s
Attention: Mr. S. A. Varga q
Gentlemen:
Ref: Joseph M. Farley Nuclear Plant - Unit 2 NPF-8 License Condition 2.C.(17) and Letter from F. L. Clayton, Jr. to S. A. Varga i
dated September 30, 1981 As required by the Joseph M. Farley Unit 2 Full Power License, NPF-8 [ paragraph 2.C.(17)], the design of a modified containment vent and purge system to reduce the use of the 18-inch purge valves during power operation was submitted by the referenced letter on September 30, 1981.
Subsequent conversations with members of your staff have led to a revision of the proposed design. Attached is a description of the revised design. This modification is scheduled to be installed prior to startup following the first refueling.
If you have any questions, please advise.
Yours very truly, Yc h'L. Claytory Jr.
(
F.
FLCJr/CLB:de Attachment cc: Mr. R. A. Thomas w/ attachment)
Mr. G. F. Trowbridge w/ attachment)
Mr. J. P. O'Reilly w/ attachment)
Mr. E. A. Reeves (w/ attachment)
Mr. W. H. Bradford (w/ attachment)
)gb 8111100509 811030
/I PDR ADOCK 05000 gf g P
_____________________________--------------------_a
ATTACHMENT Alabama Power Company is replacing the existing 18-inch Containment Mini-Purge Valves (valves 289, 290, 291, and 292 on Figura 1) with 8-inch butterfly valves (valves 289, 290, 291 and 292 on Figure 2). The conta.nment isolation valve arrangement remains as shown in FSAR Chapter 6.
All of the new 8-inch valves are actuated by an air-operated Bettis actuator. The actuator design is " air-to-open and spring-to-close" with the valve failing in the closed position. Both the valves and actuators will be qualifiedseismicallyandenvironmentally,hEseadesignlifeo{
40 years, and can withstand a cumulative radiation dose of lx10 rads (gama). The seismic qualification will be accomplished by prototype testing prior to operation of the system. The valves
^
will be capable of opening or closing against DBA, LOCA and Steamline Break conditions.
The valve is designed tc function at a pressure of 80 psig., a temperature of 381 F, a maximum differential pressure of 80 psi, 100% relative humidity, and exposed to containment spray (NaOH and 10,000 PRM Boric acid). The closing time of the valve at design cenditions will be less than or equal to 3.5 seconds. These valves will close upcn receipt of a contain-ment isolation signal (generated as a result of safety injection, high containment pressure, or high containment radiation) and will remain closed on safety injection reset as required Ly IEB 80-06.
The valves will comply with the follow'ng standards:
ASME Boiler and Pressure Vessel Code,1980 Edition Sections II, III, V, VIII, IX ANSI B16.5 - 1977 ANSI N271 - 1976 ANSI N45.2.2 ANSI N45.2.6 MSS-SP-67, Butterfly Valves IEEE 323, 1974 IEEE 344, 1975 This design was discussed with the NRC staff in March end April of thii year.
It con. plies with the requirement 3 of Branch Technical %sition CSB-6-4 and the Unit 2 SER, Supplement 5, Section 6.2.3.5.
The new valves and design meet or exceed all assumptions presently used in accident analysis. The proposed modifications have no adverse impact on safety or any analysis.
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