ML20064N238
| ML20064N238 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/25/1994 |
| From: | Feigenbaum T NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NYN-94030, NUDOCS 9403290226 | |
| Download: ML20064N238 (2) | |
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Nortl1 North Atlantic Energy Service Corporation
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$ Atlantic se i=* N" =4 (603) 474 9021, Fax (601) 474 2987 o
The Northeast Utilities System hl C. Feigenbaum NYN. 94030 Senior Vice President 3.
Chief Nuclear Officer March 25,1994 United States Nuclear Regulatory Comrnission Washington, D.C. 20555 Attention:
Document Control Desk Reference; l'acility Operating I.ieense No. NPF-86, Docket No. 50-443
Subject:
Inoperable Seismic Monitoring Instrumentation Gentlemen:
North Atlantic linergy Service Corporation (North Atlantic) provides in the linclosure a report of seismic monitoring instrumentation that was inoperable fbr inore than 30 days. This report is submitted pursuant to Technical Specifications 3.3.3.3, Seismie instrumentation and 6.8.2, Special Reports.
Should you require further infbrmation regarding this matter please contact Mr. James M. Peschel, Regulatory Compliance Manager, at (603) 474-9521 extension 3772.
Very truly yours, )_
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Ted C. Fei enbaum TCF:MDO!act 1:nelosure ec:
Mr. Thomas T. L!:rGn Mr. Antone C. Cerne Regional Admini3trator NRC Senior Resident inspector U.S. Nuclear Regulatory Com nission P.O. Box 1149 Region i Seabrook, Nil 03874 475 Allendale Road King of Prussia, PA 19406 Mr. Albert W. De Agazio, Sr. Project Manager Project Directorate 1-4 Division of Reactor Projects U.S. Nuetear Regulatory Commission jI b'f 2 Washington, DC 20555
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9403290226 940325 ik PDR ADOCK 05000443 8
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liNCLOSURl! TO NYN-94030 INOPERABI E SEISMIC MONITORING INSTRilMENTATION f
On March 4,1994 seismic response spectrum recorder 1-SM-X-6706 was removed from service to perform the 18 month Channel Calibration pursuant to Surveillance Requirement 4.3.3.3.1.
Recorder I-SM-X-6706 is located in the Containment at the -26 foot elevation. Upon opening the recorder to commence the calibration corrosion and moisture damage was noted. Specifically, numerous sensors were corroded and their ability to accurately record seismic activity was called into question. The damaged sensors were replaced and recorder 1-SM-X-6706 was restored to operable status on March 17,1994.
On March -16, 1994 it was determined that recorder 1-SM-X-6706 had been inoperable for an indetenninate period of time. Therefore, this occurrence is being reported pursuant to. Technical
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Specifications 3.3.3.3, Seismic instrumentation, and 6.8.2, Special Reports.
'I T he seismic response spectrum recorders are sealed with rubber gaskets on the cover plates and all bolts-
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penetrating the recorder case are sealed with silicon. The apparent cause of the corrosion is exposure to j
water or moistnre from an indeterminate sonrce. Two other seismic response spectrum recorders located j
in the same area in the containment did not exhibit similar corrosion. The cause of the excessive corrosion in recorder 1-SM-X 6706 will be evaluated in accordance with the North Atlantic corrective i
action program.
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