ML20136H210

Special Rept:On 961001,suppl for Inoperability of loose-part Detection Sys Channel for More than 30 Days.Channel/Detector Malfunction Isolated to Instrumentation Contained within Inerted Unit 2 Primary Containment

ML20136H210
Person / Time
Site:	Limerick
Issue date:	03/14/1997
From:	Boyce R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9703190087
Download: ML20136H210 (2)

Text

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Roturt W.Boycs Plant Manager

, 4 Lirnerick Generating Station 5pr l PECO NUCLEAR ecco cee,2vcomneev Limenck Generatum Statm A Unit of PECO Energy PO Box 2300 Sanatoga. PA 19464-0920 l 610 718 2mm l

L T.S. 3.3.7.10 j T.S. 6.9.2 l March 14, 1997 Docket No. 50-353 -

License No. NPF-85 l

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

SUBJECT:

Limerick Generating Station, Unit 2  ;

Special Report Supplement for the Inoperability of  ;

a Loose-Part Detection System Channel for More Than 30 Days This Special Report supplement is being submitted pursuant .

to the requirements of Limerick Generating Station (LGS),

Unit 2 Technical Specifications (TS) Section 6.9.2 as required by TS Section 3.3.7.10, " Loose-Part Detection System." TS 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 October 1, . 1996, the original version of this Special Report was submitted concerning the inoperability of the LPDS. channel / detector which monitors the acoustic level on the 'B' Main Steam Line. This Special Report supplement provides the cause of the malfunction and the actions taken to restore the channel to an operable status, as committed I in the original Special Report. This channel / detector malfunction was isolated to instrumentation contained within the inerted Unit 2 Primary Containment. A work order was initiated to inspect the instrumentation within the Primary c Containment during the next Unit 2 outage of sufficient L duration.

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March 14, 1997 .

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Between December 6 and 13, 1996, Unit 2 was shutdown allowing for access to the Primary Containment and inspection of the inoperable LPDS channel. An inspection revealed the accelerometer and hard line cable showed physical damage at their connection points due to normal wear and aging. The accelerometer, sensor cable, and line driver were original plant equipment and were replaced.

Unit 2 reactor power ascension was delayed due to equipment problems. On December 27, 1996, reactor power was high enough to support testing of the LPDS channel. On December 28, 1996, following successful completion of the channel functional survei lance test, the 'B' Main Steam Line LPDS channel was declared operable.

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

Very truly yours, i

DMS:cah cc: H. J. Miller, Administrator Region I, USNRC N. S. Perry, USNRC Senior Resident Inspector, LGS l

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