05000395/LER-1983-019, Forwards LER 83-019/01L-0.Detailed Event Analysis Encl

Forwards LER 83-019/01L-0.Detailed Event Analysis Encl

ML20072R078
Person / Time
Site:	Summer
Issue date:	03/30/1983
From:	Dixon O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20072R081	List: 05000395/LER-1983-019, Forwards LER 83-019/01L-0.Detailed Event Analysis Encl
References
NUDOCS 8304050443
Download: ML20072R078 (3)

LER-2083-019, Forwards LER 83-019/01L-0.Detailed Event Analysis Encl

Event date:
Report date:
3952083019R00 - NRC Website

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SOUTH CAROLINA ELECTRIC & GAS COMPANY p .f, $

POST OPPICE 784 M y Q j CotuustA. S*UTH CAROLINA 29218  % *, 'i @

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, ,,,, March 30, 1983

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J F A Mr. James P. O'Reilly / j ~

Regional Administrator U.S. Nuclear Regulatory Commission $

Region II, Suite 2900  ? -

101 Marietta Street, N.W. 4 ,

Atlanta, Georgia 30303 _,

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SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 ,

Operating License No. NPF-12 e Fourteen Day Written Report -

LER 83-019 -

Dear Mr. O'Reilly:

Plea.se find attached Licensee Event Report #83-019 for Virgil C. 3 Summer Nuclear Station. This Fourteen Day Report is required by Technical Specification 6.9.1.12.(b) as a result of entry into 1 Technical Specification 3.0.3, " Limiting Conditions for Operation i and Surveillance Requirements, Applicability," on March 17, 1983. 6 Sho,uld there be any questions, please call us at your convenience. _

Ver truly our ,

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- 4 O. W. Di on, JL' f HCF:OWD/dwf/fjc 3 Attachment cc: V. C. Summer G. J. Braddick T. C. Nichols, Jr.,/O. W. Dixon, Jr. J. C. Miller 5 E. C. Roberts J. L. Skolds i H. N. Cyrus J. B. Knotts, Jr. -

Group / General Managers I6E (Washington) y R. B. Clary Document Management C. A. Price Branch E' O. S. Bradham INPO Records Center j A. R. Koon NPCF .

D. A. Lavigne File (Lic./Eng.) 1 C. L. Ligon (NSRC) ,

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1 Mr. : James'~ P. . O' Reilly , 1 LER No.'83-019- .;

Page Two-l March 30,.1983  ;

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES- ,

i Cn March 17, 1983, with the Plant operating in Mode 1, Train "A" of the Residual Heat Removal (RHR) System'and Traini"A" of the High Head. Safety Injection. System were rendered. inoperable'for

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[ approximately 45 minutes per Technical Specification definition 1.18, " Operability." - The cause of this conditior is' described-L below. The Train "B" RHR pump previously had been. removed from i: service'for preventive maintenance.- Technical SpecificationL 3.5.2, " Emergency Core Cooling' Systems - Tavg >1350*F," requires -

p that two (2) independent Emergency Core Cooling ~ Systems (ECCS)-

be OPERABLE for Modes 1, 2, and 3. Since the associated Technical; ,

Specification Action Statement only; addresses onef(l) ECCS L inoperable, Specification 3.0.3 was implemented for- the

approximate-45 minate time period.

1 I There.were no adverse consequences resulting from'this condition.

L The Train "A" Chilled Water Pump remained in service,.thereby j- providing cooling water to the Train'"A" Component: Cooling Water

! pump motor and the Train "A" Charging / Safety-Injection pump.-

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b CAUSE AND CORRECTIVE ACTIONS I .

4 On March 16, 1983, the' Train "B" RHR-pump was removed.from service ,

i in order to perform preventive maintenance.- Technical b Specification 3.5.2 Action Statement (a)Lwas voluntarily. entered

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j in order'to' perform this maintenance. The Action' Statement allowed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to have the pump returned; to operable- status.

2 On March 17,'1983, at approximately'0120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br />,, Train "A"jRHR'and -

i Train'"A" High Head Safety Injection ~were rendered-inoperable' when a' support- system (Train "A" ~ Chilled Afater System) failed'to j[, restart subsequent toLperformance of a surveillance test. 'The- s.

r' Chilled Water: System provides cooling water 0to the: Component j Cooling < Water? pump motor bearings. The: Component; Cooling' Water:

. System la~ turn'supolies cooling waterxto'the1RHRipump?.sealt'and the RHRtheat exchangerishell/sideias'the heat 7 transfer medium.

Thus,

the. cascading failure resulted'in theCinoperability ofETrainL

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[ "A" RHR. The Chilled Water: System directly1provides cooling water <

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'for?theLCharging/SafetyJInjection"puup-oil; coolers.-

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Mr.'JamesfP. O'Reilly. ' ;

LER.Mo. 83-019-

'Page Three.

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March 30,-1983 i l i '

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CAUSE AND CORRECTIVE ACTIONS"(Continued)

L The Chilled-Water System failure is attributed to problems.

-experienced in the starting circuitry'of chiller unit XHX0001C L (swing unit XHX0001C wasialigned to Train "A" chilledLwater- -

L because the normal Train "A" chiller unit 1XHX0001A had been removed'from service for maintenance). More specifically,.the1 starting circuit consists of a - roller cam that actuates a micro switch for circuit completion. The cam was: discovered to be

! slipping out of' alignment relative to' the micro switch. After engineering review and. resolution of'the problem, the. chiller unit was returned to service at ~ approximately: 0205 , hours.

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l. To prevent recurrence of this problem, .the cams have been modified -

on all three (3) chiller units. .

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