ML20149G122
| ML20149G122 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/23/1994 |
| From: | Mccoy C GEORGIA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 1-94-2, LCV-0479, LCV-479, NUDOCS 9409300131 | |
| Download: ML20149G122 (2) | |
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Georgia Pc.wer Company 40 invernosi Center Parkway Pott Offce Box 1295 Bamingham Alabama 35201 Te;ephone 205 877 7122 Georgia Power C. K. McCoy ll;l?$f ""' '
oe soutwrn eiectre sarem September 23, 1994 LCV-0479 Docket No. 50-424 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Ladies and Gentlemen:
VOGTLE ELECTRIC GENERATING PLANT TECHNICAL SPECIFICATIONS SPECIAL REPORT-UNIT I INOPERABLE SEISMIC MONITOR In accordance with the requirements of Vogtle Electric Generating Plant Technical Specifications, sections 3.3.3.3 and 6.8.2, Georgia Power Company (GPC) submits the enclosed special report concerning a seismic monitor discovered on September 18,1994, to have been inoperable for more than 30 days.
Sincerely, h.k C. K. McCoy CKM/AFS
Enclosure:
Special Report 1-94-2 cc: Georgia Power Company Mr. J. B. Beasley, Jr.
Mr. M. Sheibani NORMS U. S. Nuclear Regulatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. D. S. Hood, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector, Vogtle 3CCCf31 9409300133 940923 l
{DR ADOCK 05000424 PDR
y VOGTLE ELECTRIC GENERATING PLANT - UNIT I I
TECHNICAL SPECIFICATION SPECIAL REPORT 1-94-2 INOPERABLE SEISMIC MONITOR l
A.
REQUIREMENT FOR REPORT This report is required in accordance with the Vogtle Electric Generating Plant Technical Specifications (TS), section 3.3.3.3, which requires the inoperability of seismic monitors for more than 30 days to be reported to the Commission in a special report pursuant to TS 6.8.2.
l B.
DESCRIPTION OF EVENT j
I Technical Specification Table 3.3-5 requires a triaxial seismic trigger to be l
operable in the Unit I containment tendon gallery. This seismic trigger is set at an i
acceleration level of 0.01g on all axes.
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On April 18,1993, while performing an 18-month preventive maintenance (PM), a j
technician erroneously installed a seismic switch at the tendon gallery location, l
instead of the required seismic trigger. The seismic switch is less sensitive to i
seismic activity, with acceleration levels of 0.17g horizontal and 0.23g vertical.
l The seismic trigger and seismic switch are identical in appearance and their inventories had not been properly separated. On September 18,1994, another technician was again performing the 18-month PM, when he discovered the error.
The seismic switch was removed and a seismic trigger was installed on l
September 18,1994, and the seismic monitor was returned to service. The
-l errone.ous installation is being evaluated for any possible further actions. No '
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seismic events occurred during the period of time involved.
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