ML20029C722

Special Rept:On 940312,identified That Two of Eight Channels of Lpds Not Functioning & Were Inoperable.Cause of Malfunction Cannot Be Reported at Present Time.Channel Calibr & Subj Surveillance Test Performed Satisfactorily

ML20029C722
Person / Time
Site:	Limerick
Issue date:	04/19/1994
From:	Boyce R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9404280130
Download: ML20029C722 (2)

Text

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Robsrt W. Boyce Plant Manager Limonck Generating Swron

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m a-PECO ENERGY "Limerick

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PO Box 2000 Sanatoga. PA 19464-0920 ,

s 215 3271200 Ext. 2000 )

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T.S. 3.3.7.10

. T.S. 6.9.2

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April 19, 1994 Docket No. 50-352-License No. NPF-39' i

1 U.S. Nuclear Regulatory Commission Attn: Document Control Desk l Washington, DC 20555 1

SUBJECT:

Limerick Generating Station, Unit 1

, Special Report for Inoperability of Two Loose-Part l~

Detection System Channels for More Than 30 Days q i

This Special Report is being submitted pursuant to the requirements of Limerick Generating Station (LGS), Unit 1 Technical Specifications-(TS) Section 6.9.2 as required by TS Section 3.3.7.10, " Loose-Part Detection System." TS 1 Section 3.3.7.10' requires that with one or more of the required Loose-Part Detection System (LPDS) channels inoperable for more than.30 days, a Special Report must be prepared and submitted within 10 days outlining the cause of the malfunction and the plans for. restoring the channel (s) to operable status.

On March 12, 1994, Unit 1 was operating at 20% power with power ascension in progress following a refueling outage.

During performance'of Surveillance Test (ST) procedure, ST-6-107-590-1, " Daily Surveillance Log /OPCONS 1, 2, 3," a channel check was performed for the LPDS per TS Surveillance Requirement 4.3.7.10a. The operator identified that two of  ?

the eight channels of the LPDS were not functioning'_and.were; inoperable.

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These two channels monitor the' acoustic level on Control' Rod-Drive housing 02-31 and on.the 1A Recirculation Pump suction line nozzle. .During the y refueling outage. conducted-in February and_ March, 1994, the '

channel calibration and functica ST procedures were performed satisfactorily on all of the LPDS-channels. The channels were considered operable prior to startup.

9404200130 940419 n -1 280015- gDR ADOCK 05000 52: f,{1J z

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April 19, 1994 Pa*ge Two 4-l 4

As a result of troubleshooting, the LPDS malfunctions have been. isolated to instrumentation contained within.the inerted Unit 1 Primary Containment. Therefore, the cause of the malfunctions cannot be reported at this time. Work l orders have been initiated to inspect the instrumentation  ;

within the Primary Containment and are scheduled to be  :

performed during the next Unit 1 outage of sufficient l duration.

The malfunctioning channels have no impact on plant H operation and no interim corrective actions are necessary.

A supplement to this special report will be submitted once the cause is determined and plans identified for restoring the channels to an operable status.

If you have any questions or require additional information, please contact us.

Very truly yours, f ef far Dept l

DBN:cah  !

I cc: T. T. Martin, Administrator Region I, USNRC l N. S. Perry, USNRC Senior Resident' Inspector, LGS

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