ML20086G592

Special Rept:On 950507 & 10,loose Part Detection Sys (Lpds) Channel Sensor Found to Be Not Mounted on Piping.Cause Not Yet Determined.Sensor Reattached to Pipe & Channel Returned to Operable Status

ML20086G592
Person / Time
Site:	Limerick
Issue date:	07/07/1995
From:	Boyce R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9507170003
Download: ML20086G592 (2)

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Plant Manager

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Umenck Generating Sman a PO Box 2300 Sanatoga, PA 19464 & 20 215 M712% En 2KO T.S. 3.3.7.10 T.S. 6.9.2 July 7, 1995 Docket No. 50-352 License No. NPF-39 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Limerick Generating Station, Unit 1 Special Report Supplement for Inoperability of Two Loose-Part Detection System Channels for More Than 30 Days This Special Report supplement is being submitted pursuant i 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 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 i prepared and submitted within 10 days outlining the cause of the malfunction and the plans for restoring the channel (s) to operable status. On April 19, 1994, the original version l of this Special Report was submitted and provided information regarding two (2) LPDS channels that were identified to be inoperable on March 12, 1994. Trouble i shooting isolated the malfunctions to the inaccessible Unit 1 Primary Containment and an outage was necessary to I determine the cause'and corrective actions. The original '

version of this Special Report stated that inspections of the inoperable LPDS channels would be performed during the next Unit 1 outage of sufficient duration.

Between May 7 and 10, 1995, Unit 1 was shutdown for a planned outage allowing for access to the Primary containment and inspection of the inoperable LPDS channels.

The LPDS channel sensor on the 1A Recirculation Pump suction nozzle was found to be not mounted on the piping. The sensor was reattached to the pipe and the channel was returned to operable status following testing.

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Page Two

• The second LPDS channel sensor on the control rod housing 02-31 could not be inspected during this short outage because of the location of the sensor. Scaffolding is required to be erected to reach this sensor and radiation ,

dose rates e

near the sensor were not low enough to warrant inspec ton of this sensor. This sensor will be inspected '

during.the next Unit 1 outage of sufficient duration when the scaffolding can be created and when the radiation dose rates are lower.

The inoperable channel has no impact on plant 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 second channel to an operable status.

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

Very truly yours, l

DBN:cah cc: T. T. Martin, Administrator Region I, USNRC j N. S. Perry, USNRC Senior Resident Inspector, LGS i

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