ML18142A702
| ML18142A702 | |
| Person / Time | |
|---|---|
| Site: | Ginna  (DPR-018) |
| Issue date: | 04/27/1978 |
| From: | White L Rochester Gas & Electric Corp |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18142A702 (5) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
DISTRIBUTION FOR INCOMING MATERIAL 50-244 REC:
Z IEMANN D L NRC ORG:
WHITE L D ROCHESTER GAS 5 ELEC DOCDATE'4/27/78 DATE RCVD: 04/27/7 DOCTYPE:'ETTER
'OTARIZED:
NO COPIES RECEIVED
SUBJECT:
LTR 1
ENCL 1
RESPONSE
TO NRC LTR DTD 04/03/78... FURNISHING INFO CONCERNING DIESEL GENERATOR CONDITIONS WHICH ARE ANNUNCIATED IN THE MAIN CONTROL ROOM AT SUBJECT FACILITY.
PLANT NAME: RE GINNA UNIT 1
REVIEWER INITIAL:
XJM DISTRIBUTOR INITIAL:
+4>>+++w+++++++4++ DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS 4+++>>>++>+>>>>+>>
DIESEL ALARM CIRCUITRY FOR DIESEL GENERATORS.
(DISTRIBUTION CODE A005)
FQR ACTION:
4R QHW~I+MAN
/7 ENCL lNTERNAL:
EXTERNAL:
ILEI~W/E C I 5 MIPC4 +W/ENCL BENAROYA>+W/ENCL EISENHUT4~+W/ENCL BAER++W/ENCL EEB~~W/ENCL T.
WAMBACH>~>N/ENCL LPDR S ROCHESTER NY++W/ENCL ACRS CAT B+~W/ih ENCL I
NRC PDR+4~W/ENCL OELD++LTR ONLY HANAUER4%W/ENCL IPPOLITO++@/ENCL SHAQ~+W/ENCL BUTLER++M/ENCL RQSA4+W/ENCL DISTRIBUTION:
LTR 40 ENCL 39'I ZE:
2P
%%%>0l+%%%%%%%%%%%%%%%%%%%%%%%%4l %%%%
THF END CONTROL NBR:
781220095
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ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE, JR.
VICE PRESIDENT TELERIIOIIK AREA CODE 7ld 546-2700 April 27, 1978
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Iffyyg((@ lgNpj, Director of Nuclear Reactor Regulation Attention:
Mr. Dennis L. Ziemann, Chief Operating Reactors Branch N2 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, DC 20555 I
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07 CD
Subject:
Diesel Generator Alarm Circuitry R.
E. Ginna Nuclear Power Plant, Unit Nl Docket No.
50-244
Dear Mr. Ziemann:
In accordance with your letter dated April 3, 1978 the diesel generator conditions which are annunciated in the Main Control room have been reviewed.
The concerns expressed in your letter are addressed below.
D/G Local/remote control switch in local osition is annunciated in the existing system and will be annunciated in the proposed system as a "diesel generator inoperative" condition.
2.
3.
Low lube oil pressure is annunciated in the existing system and will be annunciated in the proposed system as a "diesel generator inoperative" condition.
The local stop control on the existing system requires reset and is not annunciated.
Annunciation of this con-dition will be included as a "diesel generator inoperative" condition in the proposed system.
78i220095
ROCHESTER GAS AND ELECTRI ORP.
DATE April 27, 1978 To Mr. Dennis L. Ziemann, Chief SHEET NO.
4 ~
The diesel generator trip on low lube oil pressure is initiated by two out of the three lube oil pressure switches.
Therefore no single failure of a pressure switch will cause an unnecessary inoperative condition.
The setpoint of the pressure switches is 40 psi while normal operating pressure is about 85 psi.
The estimated run time for the diesel at 40 psi oil pressure is 30 seconds at less than full power before the engine seizes.
To bypass the low lube oil trip when a safety injection signal is present would yield a negligible increase in diesel availability but greatly in-crease the probability permanent loss of the machine under accident conditions.
It is also noted that current designs retain the low lube pressure trip on safety injection.
On the basis of these facts it is the RGaE position that the low lube oil pressure trip not be bypassed when a safety injection signal is present.
Very truly yours, P
L. D. White, Jr.
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