ML18082B028
| ML18082B028 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 07/31/1980 |
| From: | Schneider F Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-27, NUDOCS 8009090230 | |
| Download: ML18082B028 (9) | |
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Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-7373 Production July 31, 1980 Mr. Boyce H. Grier, Director U.S. Nuclear Regulatory Commission Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Grier:
NRC IE BULLETIN NO. 79-27 LOSS OF NON~CLASS 1-E INSTRUMENTATION.AND CONTROL POWER SYSTEM BUS DURING OPERATION SUPPLEMENTAL RESPONSE -*
SALEM GENERATING STATION UNITS NOS.
1---AN~
DOCKET N0~!.23-)AND 50-311 Our July 1, 1980 response to NRC Bulletin 79-27 included a
'failure analysis for the 115v AC instrument busep'.
The analysis identified a number of loads for potential design modifications.
An evaluation of the feasibility of those design modifications has been completed and the results are given ip Attachment A.
The modifications specified in Appendix A will be made during the 1981 refueling outages for each unit.
Also, minor revisions were made to the original bus failure analysis.
The revised sheets are attached.
If you have any questions, we will be pleased to discuss them with you.
cc u.s. Nuclear Regulatory Commission
~
, Office of Inspection and Enforcement
.: __ V Division of Reactor Operations Inspection Washington, DC 20555
Attachment:
Attachment A - Design Modification Evaluation Revised Sheets - 115v AC Bus Failure Analysis Q
BUS/PANEL 11 MAC 12 l'lllC M PBD 48 15 l/2 ill!!!!
Auxiliary reedwater Control Air D1eme1 Generator*
Penetr*tion Area Venti-lation Auxiliary reedw*t*r ATTACHMENT A - DESIGN MODIFICATION EVALUATION COMPONENT
- 11 Al'N Pump Suet. Press.
Disch. Press.
Indicators Pover Supply 113' 14 S.G.'* AFW Flow
'Indicators Power Supply AYW s.G. Inlet Valvea (l 3AF2l, 14AF2l)
Indicator Power Supply AFW Storage Tank Level Indicator Power Supply Ill AFW Pump Pump Speed Speed Demand Suet. Press.
Alt. Suet. Preas.
Disch. Press, Steam Presa.
Indicators Power Supply
-lA ' 18 Hdr. Preas.
Transmitters Power Supply lA ' lC O,U, '*
Volt*
Frequency Watte Amp*
Indicators power supply Inlet and exhaust damper*
1CAV12 lCAVll 2CAV32 (Unit 2 only) 112 AFW pump Suet. press.
Disch, pres**
Indicators power *upply Ill' 12 B.G. 1a Arif flow Indicators power aupply AFW B.G. inlet valve*
(11AF21, 12AF21)
Indicator* power *upply DESIGN MODIFICATION EVALUATED Change power supply to lA VIB Change power supply to lA VIB Change power supply to lA VIB Change power eupply to lA VIB Change power supply to IC VIB 18 Hdr, transmitter power_
aupply to be changed to a different bus/panel to avoid -
erroneous indicated loae of control air accident Change lA D.G. 1nd1catora power supply to lA VIB.
Change lC D.G. indicators pover aupply to lC VIB Design to allow dampers to fail open upon lose of power.
Must be evaluated with respect to fire protection system re-quirements.
Change power supply to lB VIB Change power supply to lB VIB Change power *upply to lB VIB INTENDED ACTION Pover supply: will' be change~ H indicated Power *upply will be changed H indicated-Power supply will be.changed a*
indicated Power supply will be changed **
indicated Power supply will be changed a*._
indicated
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lB Hdr. tran**itter power supply will be changed to 12 MAC panel-Power aupply w111 be changed as indicated
'Design llOdification will. be ac-coinpliehed within guidelines of fire protection require*ente.
Power supply will be changed ae indicated Power *upply will be changed as indicated Power *upply will be changed **
indicated
BUS{PANBL
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Diesel Generator*
Reactor Coolant Station Co1111Unicationa M 1'80 48 15 3/4 ATTACHMENT A - DESIGN MODIFICATION EVALUATION COMPONENT 18 Diesel Generator Volts Frequency Watts Amps Indicator* Power Supply l'a 11,12,13,14 R.C. loops
. hot and cold legs teq>.
recorders power supply Power Supply to Station P.A.
System Cabinets
- DESIGN MODIFICATION EVALUATED Change power supply to lB VIB Change 11 R.C. loop rcdr. pwr
- supply to lA VIB Change 12 R.C. loop rcdr. pwr.
supply to 18 VIB Change 13 R.C. loop rcdr. pwr *.
supply to lC VIB Change U R.C. loop rcdr. pwr.
supply to lD VIB A backup power supply and capability to quickly transfer the system INTENDED ACTION Power supply will be changed **
indicated Power auppliea will be changed aa indicated An alternate aethod of co.. unl-cations is presently being de-signed to comply with tire pro-tection requirements.
The new system will be powered from lA VIB.
The completion of design and installation of equipment will be accomplis; id according to fire protection r!!Q~lrements.
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Pressurizer (Cont'd)
Protection System Reactor Coolant Residual Heat Removal*
M PAO F;O 01 'i/F; COMPONENT PRZ Lvl CH. I XMTR +
Indicator Pwr. Supply Demultiplexer Power Supply 11, 12, 13, 14 RC Loops CH. I Flow XMTRS +
Indicators Power Supply 11 RC Loop Diff, Temp.
Diff, Temp. Setpoints XHTRS. + Indicators H.R. Hot Leg Temp.
H.R. Cold Leg Temp.
XMTRS.
Power Supply RCS Temp. + Press Indicators Pwr. Supply RC Hot Leg Press.
XMTR, PT-405 Ill RHX Outlet Flow +
Ill RHR Injection Flow Indicators + XMTRS.
Power Supply 11 RHR Loop Cooldown Control Valve 11RH18 11 RHR Pump c.c.H.
Flow Switch Containment Sump Lvl.
Indication Ckt, 11 RHR Pump Disch.
Press. Indicator Pwr.
Supply f.:..
lA VIB EFFECT OF FAILURE Loss of CH, I Info, No System Malfunction, Loss of all Indication on Status Panel Pertaining to Reactor Trip Logic Loss of CH. I Indication, No System Malfunction.
Loss of all Loop 11 Temp.
Information Loss of Temp. + Press. Ind.
for *pops*
Loss of PT-405 Functions.
Loss of POPS CH. I
- Loss of Opening Permissive For RHR Cool Down Isolation Valve 1RH2, Loss of Hot Leg Press Ind.*
Loss of Indication for 11 RHR Loop Loss of Valve Control, Valve Remains in last Position.
Receive Low CCH Flow Alarm
- on Cont. Console.
Alarm is Due to Pwr. Loss.
Loss of Cont. Sump Lvl. Ind, Loss of Disch. Press.
Indication
~ I ALTERNATE INDICATION/
EQUIPMENT AVAILABLE CH's II + III Indication Available None CH's II + III Indication Available on Cont. Console None Alternate Temp, + Press*,
Indication Available on Cont.
Console Pops CH II Available.
To Open 1RH2, Must Restore Pwr. to Ckt. or Bypass Permissive Contact in Valve Motor Control Ckt.
Problem with 1RH2 Identified in LER 76-04.
Alternate Hot Leg Press Ind.
Available on Cont. Console 112 RHR Loop Available 112 RHR Loop Available 112 RHR Loop Available Alternate Level Indication Available on Cont, Console 112 RHR Loop Available DESIGN MODIFICATION TO BE EVALUATED None None None None None None None None None None None
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SYSTEM Pressurizer (Cont.)
Reactor Coolant Residual Heat Removal' M PBO 60 01 13/14 COMPONENT PRZ Relief Tank Level Press.
Temp.
XMTRS + Indicators Pwr.
Supply l's-11, 12, 13, 14 RC Loops CH. II Flow MTRS. +
Indicators Pwr. Supply iB VIB EFFECT OF FAILURE Loss of all PRT Indication Except Associated Valve Position Indications.
Loss of CH. II Indication No System Malfunction Due to Ckt. Loss.
112 RC Loop Loss of all Loop 12 Temp.
Diff. Temp.
Information Dif. Temp. Setpoints XHTRS + Indicators, W.R. Hot Leg Temp.
W.R. Cold Leg Temp.
XMTRS. Pwr.
Supply RCS Temp. + Press. XHTRS.
+ Indicators Pwr. Supply Loss of Temp + Press Ind.
Loss of PT-403 Functions R.C. Hot Leg Press Loss of Pops CH. II XMTR. PT-403
- Loss of Opening Permissive 112 RHX Outlet Flow XHTR.
+ Indicator + 112 RHR Injection Flow Indicator Power Supply 12 RHR Loop Cooldown Control Valve 12 RH18 12 RHR Pump C.C.W.
Flow Switch For RHR Cooldown Isolation Valve lRHl.
Loss of Hot Leg Press. Ind.
Loss of Indication for 12 RHR Loop Loss of Valve Control.
Valve Remains in Last Position.
Receive Low CCW Flow Alarm on Cont. Console, Alarm is Due to Pwr. Loss ALTERNATE INDICATION/
EQUIPMENT AVAILABLE None CH's I & III Indication Available on Cont. Console None Alternate Temp. + Press Ind. Available on Cont.
Console Pops CH, I Available to Open
- lRHl, Must Restore Pwr. to Ckt. or Bypass Permissive Contact in Valve Motor Control Ckt.
Problem with lRHl Identified in LER 76-04.
Alternate Hot Leg Press Ind, Available on Cont. Console.
Ill RHR Loop Available Ill RHR Loop Available Ill RHR Loop Available DESIGN MODIFICATION TO BE EVALUATED None None None None None None None None
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SYSTEM Pressurizer (Cont'd)
Reactor Coolant Residual Heat Removal*
Safety Injection*
M PBO 60 01 21/22 COMPONENT PRZ Pwr. Oper. Relief Va. 1PR2 Control PRZ Spray Valves lPSl + *1PS3 Control
+ R.C. Press. Demand XMTR + Indicator Pwr. Supply PRZ Spray Line Temp.
LOOP 13 + Vapor Temp XMTRS. Pwr. Supply PRZ Safety Valve,
Disch. Temp. Loop 12 XMTR Pwr. Supply f's 11, 12, 13, 14 R.C.
Loops CH. III Flow XMTRS +
Indicators Pwr. Supply EFFECT OF FAILURE Loss of Auto - Open Capability for 1PR2 Loss of Auto-Man. Cont.
lPSl + 1PS3 Valves Normally Closed Loss of PRZ HTR. Control Loss of all Pertinent Spray Info Except PRZ Liq. Temp + Surge Line Temp Indications Loss of Ind. in Cont. Room Loss of CH. III Indication No Sysem Malfunction Due to Ckt. Loss 113 RC Loop Loss of all Loop 13 Temp.
Diff. Temp.
- Information Diff. Temp. Setpoints XMTRS + Indicators W.R. Hot Leg Temp.
W.R. Cold Leg Temp.
XMTRS. Pwr. Supply R.C. Press XMTR +
Loss of Press. Ind.
Indicator Pwr Supply R.C. Loop's 11, 12, 13, l'4 Avg Temp Indicators +
Signal Comparators Pwr Supply Ill RHR Pump Disch.
Press. XMTR. Pwr. Supply 112 RHR Loop Injection Flow XMTR.
Pwr Supply
~*s 13 + 14 Accumulators Level + Pres. XMTRS +
Indicators Pwr. Supply Loss of Tavg. Indication for all Loops (Indicators +
Recorders Affected).
Loss of *Indication Loss of Indication Loss of Indication ALTERNATE INDICATION/
EQUIPMENT AVAILABLE lPRl Operation Available Manual Htr. Control Available on Cont. Console None Loops 11 + 13 Indication Available in Cont. Room CH's I + II Indication Available on Cont. Console None Alternate Press Ind. Available on Cont. Console Diff. Temp. Indication Available for Loops 11, 12, 14 11 RHR Loop Flow Indications Available in Cont. Room Alternate 12 RHR Inj. Flow Ind. Available on.cont.
Console Alternate Indication Available on Control Console DESIGN MODIFICATION TO BE EVALUATED None None None.
None None None None None None None None
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1 Reactor Coolant Residual Heat Removal Rod Control Safety Injection
,./
./
M P80 60 01 29/30 lD VIB COMPONENT EFFECT OF FAILURE 114 R,C, Loop Loss of all Loop 14 Temp.
Diff, Temp.
Information Diff, Temp. Setpoints XHTRS. + Indicators W.R. Hot Leg Temp.
W.R. Cold Leg Temp, XMTRS. Pwr. Supply RHX's. Bypass Control Loss of Manual Valve Control Valve 1RH20 Valve Remains in Last
- Position, Valve Normally Closed Bank Control Rod Position Loss of Recorders Recorders Pwr. SupflY T Auct. Rod Control RWST Lvl, XMT~. +
Indicator Pwr. Supply l's 13 + 14 Accumulators Level + Press. XMTRS. +
Indicators Pwr. Supply.
I 11 SI Pump Disch.
Press. + Flow XMTRS. +
Indicators Power Supply Loss of all Inputs to Rod Control and Rod Speed Control.
Loss of Auto-Man. Bank Selector switch Operation.
Rod Control Urgent Failure Alarm in Cont. Room Rods Remain in Last*Position Loss of RWST Level Indication Loss of Level + Press.
Indications Loss of Loops 11 + 14 SI Flow
+ Press. Indication ALTERNATE INDICATION/
EQUIPMENT AVAILABLE
, None RHR Loops Flow Indication Available Rod Position Indication Available on Cont. Console, Rod Bottom Lights Operational, Reactor Trip Capability Remains Operational Alternate RWST Level Indication Available on Cont.
Console Alternate Level + Press Indications Available on Control Console.
112 SI Pump Disch. Press. +
Disch, Flow Ind. Available on Cont. Console DESIGN MODIFICATION TO BE EVALUATED None None None
.None None None None I
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I SYSTEM Residual Heat Removal Rod Control Safety Injection Service Kater Station Air Penetration Area Ventilation Containment Ventilation M P80 58 04 5/6 COMPONENT l's 11 and 12 RHR Pumps Motor Amps Indicators Power Supply Ill RHX Outlet Control Valve 11RH18 Position Indicating Relays Control ' Shutdown Rod Position Indicators Power Supply l's 11 and 12 SI Motors Amps Indicators Power Supply l's 11, 12, 15, an~ 16 Pumps Motor Amps Indicators Power Supply 11 Station Air Comp.
Control Ckt.
(Unit 11 Only) 12 Station Air Comp.
Control Ckt.
(Unit 2 Only)
Inlet and Exhaust Dampers 1CAV12 1CAV13 2CAV33 (Unit 2 Only) l's 11, 13 and 15 Fan Coil Unite Outlet Water Temp. and Flow indicators Power Supply 11 MAC PANEL EFFECT OF FAILURE Loss of indication only, syst-em operatic~ not affected by ckt. loss.
Loss of Open-Close position indication.
Lose of indication only.
All indicators fail mid-scale.
Ckt. loss has no effect on rod control circuitry.
Loss of indication only.
Ckt. loss has no effect on system operation.
Lose of indication only.
Ckt loss has no effect on system operation.
Lose of 11 Station Air Com-pressor (if running).
Loss of 12 Station Air Com~
presser (if running).
Loss of ckt. causes damper closures and penetration area exhaust fans to turn off.
Penetration area may be subjected to higher temp.
causing alarms.
Lose of indication only.
Ckt. loss has no effect on system operation.
Service water supply remains.
ALTERNATE INDICATION/
DESIGN MODIFICATION EQUIPMENT AVAILABLE TO BE EVALUATED Pump operation may be verified None.
via diech. press. indication in Control Room.
112 RHR loop available.
None.
Step counters, position & in-None.
sertion limits recorder avail-able on Control Console, Core flux indication available in Control Room.
Disch, Press. and Disch. Flow
- None, Indication available on Control Console.
l's 11 and 12 Hdr. Press indi-
- None, cation available on Control Console.
12 and 13 Station Air Compres-None.
sore available.
11 and 13 Station Air Compres-. None.
sors available.
None.
s.w. indication for l's 12 +
14 F.C. unite available on
- cont. Console.
Design to allow dampers to fail open upon loss of power.
Provide positive acting interlock on exhaust fans.
Must be evaluated with respect to fire protection system reqts.
None
- 1.
l Diesel Generator Main Steam Pressurizer Reactor Coolant Residual Heat Removal Rod Control Service Nater Station Air M PBO 58 04 9/10 COMPONEN'l' lB Diesel Generator Volts Frequency Watts Amps Indicators Power Supply Atmos. Relief VA's llMSlO and 14 MSlO Position Indicating Relays
- Control Heaters A,
B, C Amps.
Indicators Power Supply I's 11, 12, 13, 14 R *. c.
Loops Hot & Cold Legs Temp.
R~corders Power Supply RHX's By-Pass Valve 1RH20
- Position Indicating Relays 112 RHX Outlet Cont.
VA. 12 RH18 Position Indicating Relays Rod Bottom Lights l's 13 and 14 SN Pumps Motor Amps.
Indicators Power Supply 13 Station Air Comp.
Control Ckt.
(Unit 1 Only)
T*
12 MAC PANEL EFFEC'l' OF FAILURE.
Loss of all lB D.G. operating parameters ind. If necessary to operate, local operation a necessity.
Failure of ckt. '
does not affect D.G.
availability.
Loss of pos. ind. only.
Valve control not" affected by ckt. '
loss.*
Loss of Amps. Ind, only.
Heater control not affected by ckt. loss.
Loss of temp. ind. Information necessary as part of SI termi-nation criteria for MSLB.
Loss of pos. ind. only.
Valve control remains.
Valve does not change position when ckt.
lost.
ALTERNA'l'E INDICA'l'ION/
EQUIPMEN'l' AVAILABLE DESIGN HODIFICA'l'ION TO BE EVALUATED Local indica~ion available.
Change Indicators Power Supply Control Room indication avail-to lB VIB.
able for lA and lC D.G.'s. **
Steam Generator pressure indi-cation available on Control Console.
Prz. level and press. ind.
available on Control Console.*
Avg. temp. ind. and A'l' ind.*
for all loops available on Control Console.
l's 11 + 12 RHR loops flow ind. and control valves operation available.
None.
None.
Change 11 RC loop Rcdr. Power Supply to lA VIB.
Change 12 RC loop Rcdr,
- Power Supply.to lB VIB, Change 13 RC.loop Rcdr. Power Supply to lC VIB.
Change 14 RC loop Rcdr. Power Supply to lD vrn.
- None, Loss of pos. ind, only..
Valve lll_RHR loop available.
control not affected by ckt, None.
lost.
Loss of rod bottom lights.
Loss of indication only.
Ckt. loss has no effect on system operation *
. Loss of 13 Station Air Com-pressor (if running),
Rod position indicators, step None.
counters, position and inser-tion limits RCDR available.in' Control Room.
l's 11 and 12 Hdr. press. ind.
None.
available on cont. console.
l's 1 and 2 Station Air Com-None.
pressors available,
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