ML20199L530
| ML20199L530 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 01/19/1999 |
| From: | Gallagher M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9901280043 | |
| Download: ML20199L530 (1) | |
Text
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Michael P. Gaitagher, P.E.
Plant Manager 4
Umerch Generating Station
=r PECO NUCLEAR PECO Energy Company bmerck Generating Station A Unit of PECO Energy PO Box 230o Sanatoga. PA 19464 0920 610 718 2000 UFSAR 3.7.4 T.S. 6.9.2 TRM 3.3.7.2 January 19,1999 Docket Nos. 50-352 50-353 License Nos. NPF-39 NPF-85 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555
SUBJECT:
Limerick Generating Station Units 1 & 2, Special Report for inoperability of the Seismic Monitoring Instrumentation for More than 30 Days This Special Report is being submitted pursuant to the requirements of Limerick Generating Station (LGS), Unit 1 and Unit 2 Technical Requirement Manual 3.3.7.2 and Technical Specifications 6.9.2, as required by the LGS Updated Final Safety Analysis Report (UFSAR) Section 3.7.4, " Seismic l
Instrumentation." The LGS UFSAR Section 3.7.4 requires that with one or more of the required seismic monitoring instruments 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 instrument (s)to operable status.
On December 14,1998, with both units operating at full power, instrumentation and Controls (l&C) technicians were performing Surveillance Test (ST) procedure ST-2-036-600-0 " Seismic Monitoring -
Triaxial Time - History Accolerometers/ Recorders (XE-VA-102/XR-VA-102, XE-VA-103/XR-VA-103, XE-VA-104/XR-VA-104, XE-VA-105/XR-VA-105, XE-VA-106/XR-VA-106) Functional Test." The test was begun on December 14,1998 at 0958 hours0.0111 days <br />0.266 hours <br />0.00158 weeks <br />3.64519e-4 months <br /> and the seismic monitor was declared inoperable at that time. During the test, the l&C technicians noticed that the spectral analyzer was not running. An attempt to reboot the system was unsuccessful. The spectral analyzer was sent to the vendor for i
analysis and rework. The vendor concluded that loss of the monitor and its spectral analyzer were due to normal age related failure of these components, and cannot be reworked. At this time, the Seismic Monitoring System can detect and record data from a seismic event, and can provide a light indicating l
that a seismic event occurred. The System is currently incapable of processing the data to determine i
the spectral response to an earthquake. Since the spectral analyzer cannot be reworked, the System is 1 O being upgraded to a Year 2000 compliant design. The upgrE,ded System will be installed, tested, and retumed to operable status by March 31,1999. The Station procedure has been upgraded to take
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compensatei action for this issue until the system is retumed to service.
f if you hav7 any questions, contact Mr. Timothy A. Moore at (610) 718-3400.
y
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Sincerely, g
y cc: H.. Miller, Administrator Region I, USNRC A. L. Burritt, USNRC Senior Resident inspector, LGS
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9901200043 990119 PDR ADOCK 05000352l S
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