05000322/LER-1988-015

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LER 88-015-02:on 880916,seismic Monitoring Instrumentation, Including Peak Acceleration Recorders,Removed from Svc for More than 30 Days Due to Corrosion on Scratch Plates.Cover Gasket Replaced & Thermal Barrier Mount to Be Installed
ML20055C503
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 05/16/1990
From: Schnaars G
LONG ISLAND LIGHTING CO.
To:
Shared Package
ML20055C491 List:
References
LER-88-015, NUDOCS 9005240086
Download: ML20055C503 (3)
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LER-2088-015,
Event date:
Report date:
3222088015R00 - NRC Website
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During the performance of SP 44.655.03, Seismic Monitoring Instrumentation Calibration and Functional Test, the following Peak Acceleration Recorders were removed from service for calibration on 9/16/88: 294-ZR006A (Drywell - el. 67') and Z94-ZR006B (Main Steam Line, Reactor Bldg. - el. 131'). During calibration of Z94-ZR006A, new parts were required but were unavailable. New parts were obtained but the calibration could not be completed within the 30 day period. The ZR006B recorder was found to be inoperable. The scratch plates located in the recorder were found to have a white coarse powdery finish instead of a smooth metallic finish. This corrosion of the scratch plates was caused by moisture intrusion through a gasket that became deteriorated due to high temperatures.

This instrurHent is located on a main steam line to satisfy the requirement as committed to in Reg. Guide 1.12, Section C. This instrument is not safety related nor is it required to be Environmentally Qualified. This supplemental report is being submitted to identify the cause of the inoperability of the ZR006B recorder and the status of corrective actions taken. l 9005240086 900516 FDR ADOCK 05000322 S PDC NaC Feem 3t4 (64191

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DESCR EILQH_QE_IHE_EYESI During the performance of SP 44.655.03, Seismic Monitoring  !

Instrumentation Calibration and Functional Test, the following Peak Acceleration Recorders were removed from service for calibration on t 9/16/88: 294-ZR006A (Drywell - el. 67') and Z94-ZR006B (Main Steam Line, Reactor Bldg. - el. 131'). During calibration of Z94-ZR006A, new parts were required but were unavailable. New parts were obtained but the calibration could not be completed within the 30 day period. The ZR006B recorder was found to be inoperable. The i scratch plates located in the recorder were found to have a white j

coarse powdery finish instead of a smooth metallic finish. This 3 corrosion of the scratch plates was caused by moisture intrusion through a gasket that became deteriorated due to high temperatures.

This instrument is located on a main steam line to satisfy the

requirement as committed to in Reg. Guide 1.12, Section C. This instrument is not safety related nor is it required to be Environmentally Qualified. This supplemental report is being submitted to identify the cause of the inoperability of the ZR006B recorder and corrective action.

CAUSE_QE_IHE EVENI The ZR006B recorder is physically mounted on a Main Steam Line.

This caused the cover gasket to be exposed to high temperatures -

during the periods that the plant operated at low power. Since the gasket is only rated for a maximum of 250 degrees F this caused the l gasket to deteriorate. When the gasket was removed it was hard and brittle and broke into pieces.

l Due to the deterioration of the cover gasket, moisture intrusion i I

occurred and caused the scratch plates to corrode. These plates, which are made of gold plated aluminum, should have had a smooth l 1

metallic finish but at the time of this event they had a coarse, gray, powdery finish and were beyond the point of being functional.  !

Moisture intrusion is also indicated by the condition of the i desiccant which was pink and fused into larger pieces.

l l l CORRECTIVE ACTIONS l

1. The cover gasket was replaced with a similar model. Since the plant is shutdown and defueled, the gathet will not be exposed to excessive temperatures. ,

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2. Engineering Change Report, ECR H-1133, has been written to request the installation of a thermal barrier mount. This would protect the seismic recorder from the high temperature of the main steam line. Implementation of this ECR has been deferred indefinetely due to the New York State - LILCO Shoreham Settlement Agreement.
3. Station Procedure SP 44.655.03 has been replaced with five smaller surveillance procedures. This will allow the testing required by Technical Specification 4.3.7.2.1 to be performed ,

in stages and will minimize the chance of a seismic monitoring instrumuut, being inoperable for more than 30 days.

MDITIONAL_lHEQRtiAllOB

a. Manufacturer and model number of failed component:

Manufacturer - Engdahl Enterprises Model No. - PAR 400 l

b. LER numbers of previous similar events:

86-016,87-002, 88-004,88-013, 88-037 ,

NRC F.mi W.1640s

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