ML20197B212
| ML20197B212 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 10/10/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8610280130 | |
| Download: ML20197B212 (2) | |
Text
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DuxE POWER GOMPANY P.O. ISOX 33180 CHARL0rrTE, N.C. 28242 HALILTUCKER TELepnown
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October 10, 1986 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re:
Catawba Nuclear Station, Units 1 & 2 Docket No. 50-413 and 50-414
Dear Dr. Grace:
Pursuant to Technical Specifications 3.3.3.3 and 6.9.2, please find attached a Special Report concerning the inoperability of the Seismic Monitoring System.
Very truly yours,
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Hal B. Tucker RWO/38/slb Attachment xc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 NRC Resident Inspector l
Catawba Nuclear Station 8610280130 861010 l
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Special Report Seismic Monitoring System On September 1,1986, the Seismic Monitoring System was declared inoperable when personnel began the 18 month calibration of the system.
Failure to restore the entire system to operable status within the required period of thirty (30) days resulted in implementing Action Statement a. of Technical Specification 3.3.3.3.
At 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> on September 1,1986, the Seismic Monitoring System was declared inoperable when personnel began the 18 month calibration of the Active (Kinemetrics) portion.
On September 8, 1986, personnel began the 1,8 month calibration of the Passive (Engdahl) portion. It was during this time (September 12, 1986) that Peak Acceleration Recorders IMINT5010 and IMINT5020 were found damaged due to excessive heat. This heat problem was identified in April, 1985 when these same two recorders were found damaged. A Station Problem Report was generated to move the recorders, and mirror insulation was installed in an attempt to temporarily correct the problem. A Nuclear Station Modification (NSM) was written to move the two recorders to better locations and was scheduled to be implemented during the second Unit I refueling outage. Upon discovery of the damaged recorders on September 12, 1986, the NSM was given an urgent priority and was added to the first refueling outage schedule.
Calibration of the Kinemetrics equipment was completed and restored to operating status on September 19, 1986. Calibration of the Engdahl equipment, with the exception of IMIMT5010 and 5020, was also completed and restored to operating status on September 19,.1986.
Two new Peak Acceleration Recorders were ordered and were received on September 25, 1986. These new recorders could have been installed in their old locations before the thirty (30) day limit. However, it was decided that rather than risk possible damage to the new recorders (and also ALARA considerations), we would wait until completion of the NSM. This will allow the system to then be declared operable.
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