ML17258A399
| ML17258A399 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/22/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112290453 | |
| Download: ML17258A399 (5) | |
Text
d REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
AOC ES S ION NBR: 8112290453 DOC ~ DATE: 81/12/22 NOT A R I'ZED:
NO FACIL:50-244 Robert Emmet Ginna Nuclear PlantE Un<~t 1~ Rochester G
AUTH,NAME AUTHOR AFFILIATION VIAIER g J, E ~
Rochester Gas 8 iElectric Corp'R BC IP ~ NAME RECIPIENT AFFILIATION ORUTCHFIELDF D, Operating Reactors Branch 5
DOCKET ¹ 05000244
SUBJECT:
'Submits -description supply sys mods."Sall detection
'L <<suppress power unit will be i
of fire detection 8 actuation empower elite <<station B will iprovide fire ion control for =-relay room, Auxiliary nstalled to improve power "balance DISTRIBUTION CODE: "A006S iCOPIES >RECEIVED:LTR, +ENCL SIZE:,, -
TITLE: Fire Protection Information (After Issuance. of OP. Lic ~ )
NOTES: 1 copy:SEP Sect.
Ldr ~
05000244 RECIPIENT ID CODE/NAVE ACTION:
ORB ¹5 BC 01 iCOPIES LTTR ENCL RECIPIENT ID CODE/NAh'E COPIES LTiTR ENCL 1
2 1
1 09 10 1
02 1
1 INTERNAL: ELD IE 06 NRR NAMBACH 10 NRR/DL DIR EXTERNAL: ACRS NRC.PDR NT I' LPDR NSIC 03 05 GC NRR F IORAVANT07 N
OE/CEB 08 EG LE 04 1'2 i3 1
JAN 5 19 TOTAL NUMBER OF 'COPIES REQUIRES:
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ROCHESTER GAS AND ELECTRIC CORPORATION
~ 89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E. MAIER Vice Preskkent Tct.KPHONC Age*coo@ 7to 546-2700 December 22, 1981 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Fire Detection and Actuation System R. E. Ginna Nuclear Power Plant Docket, No. 50-244 IIC'I<
OEgg,81983 e
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@gag ~@EL% 8
Dear Mr. Crutchfield:
The purpose of this letter is to describe the existing Ginna Station fire detection and actuation system power supply and planned modifications, in response to specific questions asked by the NRC staff.
- Recently, a new detection and actuation system including power supply was installed in response to the NRC's Fire Protection Safety Evaluation Report for Ginna Station dated February 14,';1979;
. As 'a result of acceptance testing and startup experience,'ertain power'upply modifications are planned, which will reduce the number of manual actions taken, following loss of primary power supplies.
Existing Power Supply in Recently Installed Fire Detection and Suppression System:
Three Gamewell Flexalarm 3000 panels (Satellite Station A, Satellite Station B, Satellite Station C) and one Alison Control A888 panel are powered by separate 20 amp circuit breakers on Instrument Distribution Panel 1B (IDP1B).
IDP1B is a Train A source, powered by a constant voltage transformer from Motor Control Center 1C (MCClC).
MCC1C has a normal offsite supply and an emergency diesel generator onsite supply.
Satellite Station A (SSA) is located in the Relay Room and provides fire detection and suppression control to all areas outside the Relay Room.
SSA does not have battery backup since it is fed from a Class 1E motor control center with an onsite standby diesel backup.
To prevent inadvertent suppression system actuation caused by reenergizing the panel following loss of offsite power, an undervoltage lockout device interrupts power to SSA when AC power drops to or below 100 volts for 8112290ygg 81122 DR ADOCK 05000244 PDR gag
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ROCHESTER GAS AND ELECTRIC RP.
December 22, 1981 Mr. Dennis M. Crutchfield SHEET NO.
more than 0.3 seconds.
Train A station batteries power the underyoltage relay and lockout switch.
This condition is annunciated on Satellite Station B (SSB), in the Control
- Room, and an operator then manually resets SSA in accordance with written procedures.
Satellite Station B (SSB) is located in the Control Room and provides fire detection and suppression control for the Relay Room.
Upon loss of power SSB transfers to a dedicated internal battery.
Satellite Station C
(SSC) is located in the Relay Room and supervises valve tamper switches.
No fire detection or
'uppression control is provided by SSC.
SSC is backed by diesels and does not have battery backup.
The Alison Control A888 panel, located in the Turbine Building, provides fire detection for Containment and the RHR pit.
The Alison panel is backed by diesels and does not have battery backup.
Planned Power Supply Modifications:
The internal power distribution in Satellite Station A will be modified to reduce the load on the existing protective devices.
An additional Auxiliary Power Unit will be installed which will improve the power balance.
This modification allows Satellite Station A to perform all required functions with adequate margin within the ampere limits of the circuitry and protective devices.
Four hour capacity dedicated batteries will be installed in Satellite Station A and Satellite Station C.
Upon loss of normal AC power these satellite stations will automatically transfer to the batteries with no interruption of system function.
This eliminates the need for manual reset -and reduces the possibility of inadvertent operation of actuation systems.
Work on these modifications is now underway.
Very truly yours, J.
. Maier