ML20005B509
| ML20005B509 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/01/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8107080317 | |
| Download: ML20005B509 (3) | |
Text
o TENNESSEE VALLEY AUTHORITY CH ATTANOOG A, e t.1NESSEE 374o1 7
400 Chestnut Street Tower II O
./
July 1, 1981 f
JUL 0 7 581* a Q' Q W.8.W N 7 i
Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation N
sk.-g U.S. Nuclear Regulatcry Commission Washington,, DC 20555
Dear Mr. Denton:
In the Matter of the
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 By my letter to you dated December 4, 1980 we submitted our schedule for performing m>difications to the reactor protection system (RPS) power supplies at the Browns Ferry Nuclear Plant. For reasons of power avcilability operating cycle 5 cf Browns Ferry unit 1 has been extended and the refueling outage scheduled for fall 1982 has been rescheduled for spring 1983 The RPS power supply modifications for unit 1 will be performed at that time.
By the December 4, 1980 letter we committed to submit design information by July 1, 1981. That information is enclosed. Also discussed is the schedule for submittal of proposed technical specifications.
Very truly yours, TENNESSEE VALLEY AUTHCRITY
(
f h l/} M LYM. Mills / Manager Nuclear Regulation and Safety Subscribed and sworn Jt before me this
/
dayofUu/JJ 1981.
U ku dhadhMu Nolar/f Public j
MyCommissionExpires[OY'k Enclosures D1070GO317 810701 0ol MPDR ADOCK 05000259 MP PDR g\\
An Equal Opportunity Employer
ENCLOSURE REACTOR PROTECTION SYSTEM POWER SUPPLY MODIFICATIONS BROWNS FERRY NUCLEAR PLANT (DOCKET NOS. 50-259, -260, -296)
Modification Design Information In order to protect the 120V ac reactor protection system from low voltage, high voltage, or low frequency, two class 1E circuit interrupters, each consisting of a contactor controlled by contacts from an undervoltage relay, an overvoltage relay, and an underfrequency relay, each which monitor the supply source, are placed in series between each of the sources of supply and the class 1E RPS distribution panels on the battery boards (see attached sketch). The normal sources are the nonclass 1E RPS system mg sets, and the alternate source is the nonclass 1E unit preferred transformer. All cables shall be designated as class 1E and routed with appropriate engineering safeguard separations.
Technical Specification Submittal Schedule The proposed modifications will be first implemented on unit 3 The proposed technical specifications will be included with a request for license amendment on unit 3 undervoltage corrective modifications, now scheduled for submittal to NRC September 18, 1981. For units 1 and 2 the proposed specifications will be included with the requested reload license amendment, now scheduled for NRC submittal December 1981 for unit 2 spring 1982 refuel outage and December 1982 for unit 1 spring 1983 refuel outage.
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