ML20136H129
| ML20136H129 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 03/10/1997 |
| From: | Boyce R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9703190059 | |
| Download: ML20136H129 (2) | |
Text
R:bart W.Boycs e
l Plant Manager Limerick Generating Station
=sg,-
l PECO NUCLEAR Po m en e nv Limerx;k Generating Station i
A Unit of PECO Energy Po Box 2300 Sanatoga, PA 19464-0920 610 718 2mM l
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l T.S.
3.3.7.10 l
T.S.
6.9.2 March 10,.1997 Docket No. 50-353 l-License No. NPF-85 U.S. Nuclear Regulatory Commission Attn: Document Control Desk-i Washington, DC 20555
SUBJECT:
Limerick Generating Station, Unit 2 Special-Report for the Inoperability of a Loose-Part Detection System Channel for More Than 30 Days This Special Report 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 l
Section 3.3.7.10 requires that with one or more of the required Loose-Part Detection System (LPDS) channels j
inoperable for more than 30 days, a Special Report must be l
prepared and submitted within 10 days outlining the cause of the malfunction and the plans for-restoring the channel (s) l to operable status.
The LPDS is required to be operable in Operational Condition (OPCON) 1 (Power Operation) and OPCON 2 (Start-up).
On January 3, 1997, with Unit 2 operating in end of cycle
'j conditions at approximately 87% power, the Unit 2 LPDS was declared inoperable for the performance of Surveillance Test ig (ST) procedure ST-2-036-408-2, " Loose-Part Detection System
- Loose Part Instrumentation Channel Calibration -
Detectors."
During performance of the ST procedure, a G
/, ((k j defective latch board was identified.
The defective latch l
board was replaced and the ST procedure was completed A
satisfactorily on January 14, 1997, with Unit 2 operating at approximately 80% power.
The Unit 2 LPDS was not declared l
operable at this time since intermittent low level alarms were being received on Channel 5.
This channel / detector 9703190059 970310 l
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4 March 10, 1997 Page Two monitors the acoustic level on the 'N4A' feedwater nozzle.
Station personnel attributed the low level alarms to insufficient signal-to-noise ratio created by low reactor power level.
A work order was initiated to inspect the Channel 5 instrumentation within the Primary Containment during the fourth Unit 2 refueling outage (2R04).
At 1601 hours0.0185 days <br />0.445 hours <br />0.00265 weeks <br />6.091805e-4 months <br /> on January 30, 1997, Unit 2 entered OPCON 3 (Hot Shutdown) for commencement of 2R04. The LPDS is not required to be operable in OPCON 3.
During 2R04, the Channel 5 accelerometer was found properly mounted with all hardware attached.
However, the accelerometer cable shielding was found embrittled.
The accelerometer and cable were replaced and satisfactorily tested.
At 0354 hours0.0041 days <br />0.0983 hours <br />5.853175e-4 weeks <br />1.34697e-4 months <br /> on February 26, 1997, Unit 2 was placed in OPCON 2 (Start-up).
The 30 day time clock of TS Section 3.3.7.10 continued upon start-up.
At 2158 hours0.025 days <br />0.599 hours <br />0.00357 weeks <br />8.21119e-4 months <br /> on February 28, 1997, the 30 days expired.
Since Unit 2 was operating at approximately 23% power, station personnel were unable to perform a channel functional test of the LPDS because of insufficient signal-to-noise ratio.
At 1951 hours0.0226 days <br />0.542 hours <br />0.00323 weeks <br />7.423555e-4 months <br /> on March 3, 1997, with Unit 2 operating at approximately 93% power, the LPDS was declared operable following satisfactory completion of procedure ST-2-036-640-i 2,
" Loose Parts Monitoring System Channel Functional Test."
The Unit 2 LPDS is operable at this time.
The inoperable LPDS had no impact on plant operation.
If you have any questions or require additional information, please contact Mr. James L. Kantner at (610) 718-3400.
Very truly yours, w
DMS:cah cc:
H.
J. Miller, Administrator Region I, USNRC N. S.