ML18078A645

LER 78-085/03L-0 on 781211:svc Water Flow Through Fan Coil Unit Was Less than Required 2500 Gal Per Minute.Caused When Solenoid Control Coil Developed an Open Circuit

ML18078A645
Person / Time
Site:	Salem
Issue date:	01/10/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078A644	List: ML18078A643 ML18078A645
References
LER-78-085-03L, LER-78-85-3L, NUDOCS 7901160277
Download: ML18078A645 (2)

Text

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e Report Number: 78-85/03L Report Date: 01/10/79 Occurrence Date: 12/11/78 Facility: Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

No. 15 Containment Fan Coil Unit Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 Reactor Power 100%

DESCRIPTION OF OCCURRENCE:

On 12-11-78, while No. 15 Containment Fan Coil Unit (CFCU) was operating in low speed, the Control Operator observed that service water flow through the unit did not meet the required 2500 gpm. No. 15 CFCU was declared inoperable at 1635 and the Action Statement for Technical Spec-

{f ication 3.6.2.3 was implemented. Performance Department was notified and rework of the service water valve controls was commenced. No. 15 CFCU was returned to service and satisfactory tests verified its operability.

The Action Statement was terminated at 2237 on 12-11-78.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was an open in the coil of the solenoid valve for 15SW57. This service water valve is a two position valve which opens partially or fully to establish the fast or slow speed service water flow rate through the CFCU. The open solenoid coil prevented 15SW57 from opening fully when 15CFCU was operated in slow speed.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.6.2.3 requires that with one group of containment cooling fans inoperable, restore the inoperable fan group to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

No. 15 CFCU was declared operable 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after it was removed from service.

No. 11, 12, 13 and 14 containment fan coil units were operable throughout this occurrence.

CORRECTIVE ACTION:

The open solenoid coil was replaced and the "O ring in the solenoid valve was replaced. 15SW57 was satisfactorily tested and returned to service.

FAILURE DATA:

Solenoid Control Valve Type JX8342A22 Manufacturer: Ansco Solenoid Valve Company ')

Prepared by SORC Meeting No.

A. W. Kapple 1-79 Manager - ~:-~~;'fting Station 790116 o::z7?

ll!RC FORM366 U.S. NUCLJ:AR REGULATURY COMMISSION

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LICENSEE EVENT REPORT CONTROL BLOCK: I 1G) (PLEASE PRINT OR TYPE Al.I. REQUIRED INFORMATION!

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~ IN !J I s I G Is I 1 IG)I o I oI - I o Io I oI o I o I - I o I o IQ)! 4 I 1 I 1 11 *1 1 101 I 10 7 B 9 L.ICENSEE CODE 14 15 L.ICENSE NUMBER :ZS 26 L.ICENSE TYPE ;IQ 57 CAT 58 CON'T CITlJ  ;~~~~~ LlJ©I o I s I 01 o I o 12 I 7 I 2 IG)l 112 I 1 !1 I 7 I a l@I 011 I 11o11 I 9 IG) 7 B 60 61 OOCKET NUMBER 6S 69 EVENT CATE 74 75 REPORT CATE . BO EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES @)

I During normal operation while operating No. 15 Containment Fan Coil Unit in slow speed, the C.O. observed service water flow through the unit less than T/S required

((Ii] I 2500 GPM. The coil unit was declared inoperable at 1535 and the Action Statement for

[)))) I T/S 3.6.2.3 was implemented. Performance Department reworked the service water

[§))]. I control valves and returned the unit to service. The Action Statement was terminated

[§]2J I at 2237 after tests confirmed operability. This is the first occurrence of this type.I

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44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

I Service water valve 15SW57 is solenoid controlled to open partially or fully to establish the service water flow through the unit. The solenoid coil develooed an o::rrJ open circuit and was replaced. Tests confirmed. operability of the unit.

o::ma 1 9 BO FAClLITY (.;ri\30 METHOD OF STATUS  % POWER OTHER STATUS \:::;::! OISCOVERV DISCOVERY DESCRIPTION @

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REL.EASED OF REL.EASE AMOUNT OF ACTIVITY L.OCATION OF REL.EASE@

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