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 05000395/LER-1983-019-01, /01L-0:on 830317,trains of RHR & High Head Safety Injection Train a Inoperable for Approx 45 Minutes.Caused by Switching Problems W/Starting Circuitry of Chiller Unit XHX0001C.Switch Apparatus Modified
References
NUDOCS 8304050443
Download: ML20072R078 (3)

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

Event date:
Report date:
3951983019R00 - NRC Website

text

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t SOUTH CAROLINA ELECTRIC & GAS COMPANY p

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CotuustA. S*UTH CAROLINA 29218

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March 30, 1983 Q

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A Mr. James P. O'Reilly

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j Regional Administrator

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Nuclear Regulatory Commission Region II, Suite 2900

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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:

3 Plea.se find attached Licensee Event Report #83-019 for Virgil C.

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.

i Ver truly our,

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Summer G. J.

Braddick T.

C. Nichols, Jr.,/O. W. Dixon, Jr.

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C. Miller 5

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C. Roberts J. L.

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N. Cyrus J.

B. Knotts, Jr.

Group / General Managers I6E (Washington) y R. B.

Clary Document Management C.

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Price Branch E'

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Bradham INPO Records Center j

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Koon NPCF D. A. Lavigne File (Lic./Eng.)

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Mr. : James'~ P.. O' Reilly,

1 LER No.'83-019-Page Two-l March 30,.1983 i

d 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

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L 1.18, " Operability." - The cause of this conditior is' described-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 that two (2) independent Emergency Core Cooling ~ Systems (ECCS)-

p 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.

1I 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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CAUSE AND CORRECTIVE ACTIONS

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

i in order to perform preventive maintenance.- Technical b

Specification 3.5.2 Action Statement (a)Lwas voluntarily. entered

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in order'to' perform this maintenance.

The Action' Statement j

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.

Chilled Water: System provides cooling water 0to the: Component r'

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

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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.

l l.

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

on all three (3) chiller units.

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