ELV-00769, Forwards Response to Remaining Confirmatory Item on Dcrdr Re Review of Annunciator Nuisance Alarms,Proposed Mods to Minimize Nuisance Alarms & Number of Annunciator Windows Lit During Normal Operations

Forwards Response to Remaining Confirmatory Item on Dcrdr Re Review of Annunciator Nuisance Alarms,Proposed Mods to Minimize Nuisance Alarms & Number of Annunciator Windows Lit During Normal Operations

ML20245G939
Person / Time
Site:	Vogtle
Issue date:	08/08/1989
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ELV-00769, ELV-769, NUDOCS 8908160260
Download: ML20245G939 (11)

Text

,

jy$ ? f

. .. m .

ga

<;4 <-

i 1. ,

f,5.11Dy ' ij 4 s,.. . - . n,

. < -y < 1 j ). l '19 ' . 'f. F ELV-00769' w n. ) 7. t" 1574n

" i August 8, 1989  ;

U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, . D. C.- '20555 i

V0GTLE ELECTRIC GENERATING PLANT NRC DOCKETS 50-424, 50-425 3

OPERATING LICENSES NPF-68, NPF-81 1 DETAILED' CONTROL ROOM DESIGN REVIEW 1 Gentlemen:

By letter dated January 26, 1989, your staff requested confirmatory information .regarding certain remaining items of the Detailed Control Room Design Review (DCRDR). By letter dated May 9,1989, (ELV-00503) Georgia Power 1 Company responded to all but one of the confirmatory items. The remaining j item involved a review of annunciator nuisance alarms, proposed modifications j to minimize nuisance alarms and the number of annunciator windows lit during i normal operations. l i

The enclosed report' responds to this remaining item. Should you have any i questions in this regard, please contact this office at any time.

Sincerely, g.,(./ W ?"

W. G. Hairston, III l

WGH,III/NJS/gm i Enclosure 1

xc: Georgia Power Company Mr. C. K. McCoy Mr. G. Bockhold, Jr.

Mr. P. D. Rushton Mr. J. A. Bailey NORMS U. S. Nuclear Regulatory Commission Mr. S. D. Ebneter, Regional Administrator , g Mr. J. B. Hopkins, Licensing Project Manager, NRR  ;

Mr. J. F. Rogge, Senior Resident Inspector, Vogtle 8908160260 890000 i PDR ADOCK 05000424 k P PNU j i on1__ _ - _ _

r_________ _ - . _ - _ _ _ _

e i l

l I

CONTROL ROOM ANNUNCIATOR SURVEY AUGUST 3, 1989 k

4 i

4

, Page 1

1

t. 1 Abnormal Control Room Annunciato$' Status for Unit 1 on 7-10-89 Mode 1, Rx Power - 100%

A1. Survey.

This survey was conducted on July 10, 1989 to determine the extent to which operators were ]

being distracted by annunciator nuisance alarms.

The survey was taken at 10:45 AM EDT with Unit i l operating at 100% power in mode 1.- The following

. annunciator windows were in a alarmed, lighted condition at the time of the survey:

i ALB002 DO3 "NSCW INTERTIE TRN A TO TRN B HI FLOW (Train B was shutdown at the time of survey. When .

shutdown in a standby position, the other train causes higher flow thru a keep-full line connecting the trains. This alarm clears when Train A is started).

ALB004 E01 " TRAIN A SYSTEM STATUS MON PNL ALERT" (CCW Pump handswitch was in Pull to Lock because a PM was being done on the pump).

ALB005 A03 "RMS CHANNEL FAILURE" (Annuciator was in due to various channels being out of service. This alarm indicates when an abnormality or failure is detected in any of over fifty individual radiation instruments. When the individual instruments are all returned to normal service it clears).

ALB010 A01 " SOURCE RANGE HI VOLTAGE FAILURE" (normally lit, green window)

• - Pcga 2 ALB010'E02 "PWR RANGE LWR DET HI FLUX DEV.

- OR AUTO DEFEAT" (This annunciator had an erratic alarm. It was found thatithe detector needed to be recalibrates to clear the annunciator. This alarm has been cleared as of 7_-13-89).

ALB011 A04 "RCP 1 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 B04 "RCP 2 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 C04 "RCP 3 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 D04 "RCP 4 OIL LIFT PUMP LOW PRESSURE"

.(normally lit, green window)

ALB012 A04 "RC LOOP TAVG/AUCT TAVG HI-LO DEV" (This indicates a deviation of 2 degrees or more between the coolant loops, but the actual deviation is less than 2 degrees. Corrective maintenance is planned.)

ALB016 EOS "AFW TURB MN STM DRN TO CNDSR TRBL" (This alarm indicates a high level in a steam line drain collector. An engineering study is in progress to determine if this is an actual condition or an indication problem. No design change has been initiated.)

ALB018 B03 "FW HTR 1C HI/LO LEVEL" (A PM was performed on FW HTR 10. Alarm cleared as of 7-17-89).

ALB034 D04 " BAT CHARGERS 1CDICA 1CD1BA TROUBLE" (This indicates trouble on one of the Train C battery chargers, but they are operating normally.

Maintenance to identify and correct the problem is planned; a plant outage will be required if +'.

i battery must be removed from service to work on the problem.) ,

p.

~

Pega 3 ALE 034.E06 " STARTER 1CD1I5N TROUBLE" L (normally lit, green window)

ALB034 E07 " STARTER 1DD1I6N TROUBLE" (normally lit, green window)

ALB034 F06 " INVERTER ICD 1IS TROUBLE" (normally lit, green window)

ALB034 F07 " INVERTER 1DD1I6 TROUBLE" (normally lit, green window)

ALB050 D02 "TB HVAC TROUBLE" (This indicates on alarm on the ventilation control pane 1~in the turbine building. A broken light bulb socket on that panel is causing an alarm; corrective maintenance is planned.)

ALB053 E02 "AFW TRN C PMP HOUSE HI TEMP" (Alarm comes in and clears automatically as the vent fan reduces the temperature. The high temperature is due to a steam leak that will be repaired in an outage when the aux 111ary feedwater pump can be inoperable.)

ALB054 A06 " NORM CHLR 2 TROUBLE" (This indicates a local panel alarm. A broken light bulb socket is causing an alarm; corrective mai: 'enance is planned.)

7-08-89 QPCP

-ALB060 F04 "METORLOGICAL TOWER TROUBLE" (Aspirator at Metorlogical Tower was causing erratic alarm on this annunciator. The alarm was kept in service to indicate other failures. Corrective maintenance is planned.)

a

"* L Pcgn 4-fi!. *

, ALB061.C06 "LVL A LEAK, DETECTED"'

(The. annunciator was illuminated with no indicated

' water! level ins any room.on. level-A.. It'has been investigated and~found that level switch'1LSH-17080 was' covered with rust and corrosion,71nside and out.

.A new switch has been. installed and the. problem is

-corrected . The? alarm has been cleared as of 7-14-89.)-

w.

ALB062 CO6?"ESF BAT RM ACIDLNEUT CONDCT' ALARM"'

(The annunc i ator a l arms an d 'will.not~ reset. There

- were no indications.of-battery acidfleakage found.

- upon investigation; 1CIS-17649 appears to be .

R

- mal f unctioning . - This alarm was' disabled 1on 7-17-89 pending: repair).

l 1

. In summary, the survey. identified 14 annunciator' windows in an alarm. condition,.and 9 which are normally lit (green-windows).during full power operation. The 14 abnormal alarms" represent a 0.9% alarm rate at;the: time of.

the. survey.

1 1

I

y,

~"

Pcga 5 a: _,

Abnormal Control Room Annunciator Status-for Unit 2 on 7-08-89 800de 1, Rx-Power - 1004 A2.' Survey

. -p E - '

This survey was conducted on July 8, 1989 to .r I

determine the extent to which operators were being. distracted by annunciator nuisance alarms.

l

< l v' I

,The survey was taken at 9:30 AM EDT with Unit 2

[

g I operating at 100% power in mode 1.. The following.

annunciat'or windows were'in.a alarmed, lighted condition at the time of the survey:

'l

' ALB003. DO3 "NSCW INTERTIE TRN A TO TRN B HI FLOW" i ' (NSCW TRAIN B was shutdown at the time of survey.

-When shutdown.in a standby position, the other train causes higher' flow thru a keep-full line connecting the! trains. This' alarm clears.when Train B is started.)

~

ALB004 E01 " TRAIN A SYSTEM STATUS' MON PNL ALERT" (because system 1208 - Charging System - was bypassed because during performance of OSP 14811-2, Boric Acid Transfer Pump Train A failed test on low pump delta P. Pump expected delta P was approximately-100 PSID while measured value was 70.5 PSID. Corrective maintenance is awaiting parts.)

ALB005 A03 "RMS CHANNEL FAILURE" (Annunciator was in due to various channels being out of service.- This alarm indicates when an abnormality or failure is detected in any of over fifty individual radiation instruments. When the individual instruments are all returned to normal service it clears.)

g,

• ~

Pnga 6 l

ALB005 E02 " SPENT FUEL PIT LO LEVEL" (Green window, normally lit because Unit 2 Fuel Pit is not yet filled. This will clear when the pit is filled.)

ALB005 F05 " ANNUNCIATOR SYSTEM DC GROUND" (The problem cannot be corrected until Unit 2 has its refueling outage when the alarm system can be disabled.)

ALB010 A01 " SOURCE RANGE HI VOLTAGE FAILURE" (normally lit, green window)

ALB010 C04 " ROD BANK LO LIMIT" (The alarm did not clear after Control Bank C was withdrawn during Operations Surveillance 14410-2.

Maintenance was performed and alarm was cleared as of 7-14-89.)

ALB010 E04 " BANK D FULL ROD WITHDRAWAL" l (normally lit, green window) l l

ALB011 A04 "RCP 1 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 B04 "RCP 2 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 C04 "RCP 3 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB011 D04 "RCP 4 OIL LIFT PUMP LOW PRESSURE" (normally lit, green window)

ALB017 A01 " MAIN FW NOZZLE DIFF TEMP HI" (The Main Feedwater Nozzle Differential Temperature Indicator is pegged off the scale in the high temperature direction, which is not correct for its indicated nozzle temperature. Corrective maintenance is planned.)

', ( Pnga 7 ALB017 A06 "RHTR A DRN TK HI/LO LEVEL" (A high level condition exists because 2LV-4377 is isolated due to a steam leak. The steam leak will be repaired during a unit outage.)

ALB017 D06 "RHTR D DRN TK HI/LO LEVEL"

(-The alarm was in because level switch 2LSH-4539 was isolated due to a steam leak. The leak will be repaired during a unit outage.)

ALB018 D04 "FW HTR 5B HI/LO LEVEL" (The alarm was in because 2LCL-4283 has a steam leak and is tagged out and 2LV-4283 is manually positioned to maintain heater level. Corrective ,

maintenance is planned.)

7-08-89 QEAB ALB033 F01 "120V AC INSTR PANEL 2NYJ TROUBLE" (An electrical ground is causing the trouble alarm. J Corrective maintenance is planned, a unit outage will {

be needed to de-energize this bus for j troubleshooting.)

ALB034 E06 " STARTER 2CD1I5N TROUBLE" (normally lit, green window)

ALB034 E07 " STARTER 2DD1I6N TROUBLE" I (normally lit, green window)

I ALB034 F06 " INVERTER 2CD1I5 TROUBLE" (normally lit, green window) l ALB034 F07 " INVERTER 2DD1I6 TROUBLE" (normally lit, green window) 7-08-89 QPCP i

ALB061 C06 "LVL A LEAK DETECTED"

(MWO written 6-15-89. The annunciator is illuminated with no indicated water level in any room on level A. This alarm is shared by over fifty room l

sump level switches making it difficult to troubleshoot the cause. Corrective maintenance is l

j. planned.)

". '. P go 8 ALB0614 F01 "TB NORTH SUMP TROUBLE" (one of the sump pumps trips on thermal overload.

These pumps are being replaced by design change package DCP 87V1E-0239 to correct the problem causing the alarms.)

LB061 F04 "CNMT BREATING AIR SUPPLY LOW PRESS" (The air supply is not pressurized during normal operation. It is used during outages. The card has been pulled to clear the alarm.)

ALB063 A06 " FILTERS BACKFLUSH PANEL ALARM" (This indicates a remote panel alarm with fifteen inputs from tank levels and filter differential pressures. The alarm was later cleared by correcting the local condition.)

In summary, the survey identified 14 annunciator windows in an alarm condition, and 11 which are normally lit, (green windows) during full power operation. The 14 abnormal alarms represent a 0.9% alarm rate at the time of the survey.

?. , '. Pcga g B. Proposed Design Modifications To Minimize Nuisance Alarms Annunciator ALB050 B03 has a design change request (DCR 89-0275) to revise high delta P setpoint to correct nuisance alarms. This alarm has been disabled pending this design request.

The MWO for ALB016 EOS is presently in engineering review and may be cause for a design change request.

Annunciator 2ALB061 F01 will be cleared by design change package. DCP 87 VIE-0239 is in progress to replace the pumps.

C. Proposed Modifications To Reduce Alarms Lighted During Normal Operations No additional modifications are planned to eliminate the normally lit alarms. These are color coded green to distinguish them while maintaining the indication of i equipment status. Both units will have 10 green windows ;

by design. The difference between units in this survey

- )

was due to the Unit 2 Spent Fuel Pit being empty (never  !

yet filled), and the Unit 1 Control Rods not being fully withdrawn at the time of the survey.

1 I

I I

I I

!