05000425/LER-1993-005

LER 93-005-00:on 930809,B Train Chiller Tripped.Caused by High Condenser Pressure Due to Excess of non-condensable Gases in Sys.Solenoid Valve Replaced,Ecw Chiller Purged & Surveillance Test Reperformed successfully.W/930830 Ltr

ML20056G952
Person / Time
Site:	Vogtle
Issue date:	08/30/1993
From:	Mccoy C, Sheibani M GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LCV-0124, LCV-124, LER-93-005-03, LER-93-5-3, NUDOCS 9309070362
Download: ML20056G952 (4)

LER-2093-005,

Event date:
Report date:
4252093005R00 - NRC Website

text

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• c l L i C. K McCoy Georgia Power

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August 30, 1993 LCV-0124 Docket No. 50-425 U. S. Nuclear Regulatorj Commissian

• ATTN: Document Control Desk Washington, D. C. 20555 t

Gentlemen:

VOGTLE ELECTRIC GENERATING PLANT LICENSEE EVENT REPORT UNIT OPERATION PER TECHNICAL SPECIFICATION 3.0.3 WHEN BOTH ESF CHILLERS WERE INOPERABLE in accordance with the requirements of 10 CFR 50.73, Georgia Power Company submits the enclosed report related to ar event which occurred on August 9,1993.

Sincerely, C. K. McCoy CKM/NJS

Enclosure:

LER 50-425/1993-005 xc: Georgia Power Com_pany Mr. J. B. Beasley, Jr.

Mr. M. Sheibani NORMS U. S. Nucitar Reculatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. D. S. Ilood, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector, Vogtle 9309070362 930830 I PDR ADOCK 05000425 0* / i S PDR M I j

f macFORJ3e4 U.S.NJCLEAR REGULATORY COMWh&4GN APPROVED OMB NO.3154 0104 a (689) EXPtRES 4rMB2 l

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r ND ': PORTS MANAGEMENT BRANCH (P433). U$ NUCLEAR NEGULA : ftv COMMISSION, WASHINGTON. DC 20555. AND TO THE PAPt.RWORK REDUCTION PROJECT (31500104). OFFICE OF ,

MANAGEMENT AND BUDGET. WASHINGTON DC20503

1. ACIUTV hAME (1) DOCAET NUMBER (2) F AM N Vogtle Electric Generating Plant - Unit 2 0l5l0l0l0l4l2l5 1 OF 3 !

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UNIT OPERATION PER TECHNICAL SPECIFICATION 3.0.3 WHEN BOTH ESF CHII I FRS WERE INOPERABLE EVENT DATE (5) EER NUMBER (6) REPORT DATE (7) OTHER FACluTIES INVOLVED (0) f MONTH DAY YEAR YEAR &E j k MONT*e DAY YEAR F ACluTY NAMES DOCKET NUMBER (S) i liiliII_  ;

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On August 9,1993, personnel were conducting a monthly surveillance test per Procedure 14400-2,

" Control Room Emergency Filtration Actuation Logic Test." In accordance with the procedure, the "A" train essential chilled water (ECW) system chiller actuation handswitch had been taken to the "Stop" position to prevent the chiller from staning when an actuation signal was initived to test the "B" train chiller response. The "B" train chiller was started at 2045 EDT, but momec ster it tripped. Personnel exited the pocedure and the "A" train chiller was returned to standby status at 2101 EDT. The 16-minute period when neither ECW chiller was available for automatic actuation I and senice represented unit operation per Technical Specification (TS) 3.0.3 since the ECW chillers perform an engineered safety feature fimetion, and there is no other TS action requirement which addresses unit operation with both chillers out of service.

The cause of the "B" train chiller trip was high condenser pressure due to an excess of non-i condensable gases in the system. A clogged purge solenoid valve prevented a control room ,

l annunciator from alerting personnel that purging of the excess noncondensable gases from the I system was needed. The solenoid valve was replaced, the ECW chiller was purged, and the surveillance was reperfonned successfully.

hRC Forni3 6(649)

I NRC MA J anA U.S. NUCLEAR $4GULATORY COMil&&#ON AVr*RCorED OMB NO 31aOC104 (6 89) EXPIRES 4r304I2 EST24ATED BURDEN PER RZSPONSE TO COMPLY WITH THIS 2"elR$EE,,CTION " ' ^" l UCENSEE EVENT REPORT (LER) no BURDE E le THE DS TEXT CONTINUATION Lyg^gNT SRANCH,P w $Q )

R ROJECT (315401 OFFICE OF 1*,^[ERW F ACUT Y hAteE (1) DOCKE) NUMBER (2) LER NUMBER (8) PAGE (3) re^a y 5eouga,m- i ag$y; Vogtle Electric Generating Plant - Unit 2 1 TEXT (# mars apace a segwett, am maWeonet AIRC Ferne .M6A s)(17) 0 l5 l0 l010 l41215 9l3 -

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A. REQUIREMENT FOR REPORT 1

i This report is required per 10 CFR 50.73 (a)(2)(i) because the unit operated in a condition  :

prohibited by the Technical Specifications (TS) when more than one engineered safety feature l (ESF) chiller of the essential chilled water (ECW) system was inoperable, requiring entry into TS i 3.0.3.

f B. UNIT STATUS AT TIME OF EVENT i

At the time of this event, Unit 2 was operating in Mode 1 (power operation) at 99 percent of  ;

rated thermal power. Other than that described herein, there was no inoperable equipment which {

contributed to the occurrence of this event.  ;

t C. DESCRIPTION OF EVENT  ;

On August 9,1993, personnel were conducting a surveillance test per Procedure 14400-2,

" Control Room Emergency Filtration Actuation Logic Test." In accordance with the procedure,  :

the "A" train ECW chiller actuation handswitch had been taken to the "Stop" position to prevent  !

the chiller from starting when an actuation signal was initiated to test the "B" train chiller response. The "B" train chiller was staned at 2045 EDT, but moments later it tripped. ,

Personnel exited the procedure and the "A" train chiller was returned to standby status at 2101  ;

i EDT. The 16-minute period when neither ECW chiller was available for automatic actuation and service represented unit operation per TS 3.0.3 since the ECW chillers perform an engineered .

safety feature function, and there is no other TS action requirement which addresses unit .

operation with both chillers out of service. l D. CAUSE OF EVENT i

The cause of the "B" train chiller trip was high condenser pressure due to an excess of non-  !

condensable gases in the system. A clogged purge solenoid valve prevented a control room ,

annunciator from alening personnel that purging of the excess noncondensable gases from the ,

system was needed.

E. ANALYSIS OF EVENT The time during which no ECW chiller was available for automatic actuation represented a minimal at-risk period. Furthermore, the "A" train was available for service via manual actuation.

Based on these considerations, there was no adverse effect on plant safety or on the health and safety of the public as a result of this event.

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NRC FORJ 3MA U.S.NUCLEAd #4GULATORY COM45$40N APPROVED OMB NO.3150 4104 Sep) EXPIRES C30S2 ESTIMATED BURDEN PER RESPON6E TO COMPLY WffH THIS

• LICENSEE EVENT REPORT (LER) MNYr RE" E Bu"RO TEd $'w' RTE +

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THE PAPERWORK REDUCTION PROJECT (31504104). OFFICE OF MANAGEMENT AND BUDGET, WASHsNGTON. DC 20503.

F ACALITV NAME (1) DOCKET NUMBER (2) LLR NUMBER (E) PAGE p)

YEAR  ; EE ENTaAL *: R &

Vogtle Electric Generating Plant - Unit 2 TLX1 (# aw.ro speco e rogured, une mesural MfC Ftrm J66A a)(17) 0 l5 l0 l0 l0 l4 l2 l5 9 l3 0l0l5 -

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• F. CORRECTIVE ACTIONS  !

1. The solenoid valve was replaced, the ECW chiller was purged, and the surveillance test was reperformed successfully.

2. A TS char.ge is being considered which would provide for the necessary test configuration ['

and preclude the need to enter TS 3.0.3 should a failure occur in the train being tested.

O. ADDITIONAL INFORMATION l F

I

1. Failed Components

'l Purge Solenoid Valve manufactured by Automatic Switch Company Part No. 2146251 5

1

2. Previous Similar Events -

None

3. Energy Industry Identification System Code Chilled Water System - KM t

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