ML20084E103
| ML20084E103 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/13/1974 |
| From: | White L ROCHESTER GAS & ELECTRIC CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20084E106 | List: |
| References | |
| AO-50-244-74-19, NUDOCS 8304140097 | |
| Download: ML20084E103 (3) | |
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? 9ES{liQh, "g[-;y;/374 Mr. James P. C'Reilly, Director CE 000
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F Directorate of Regulatory Operations 7,
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King of Prussia, Pennsylvania 19406
Subject:
Abnormal Occurrence 74-19, Malfunction of Undervoltage Relay during surveillance test R. E. Ginna Nuclear Power Plant, Unit No.1 Docket No. 50-244
Dear Mr. O'Reilly:
In accordance with Technical Specifications, Article 6.6.2a, the attached report of Abnormal Occurrence 74-19 is hereby submitted.
Very truly yours,
fY-L. D. White, Jr.
Attachment
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,,pu KGO4140097 741213 1232C gDRADOCK 05000244 PDR OCFY SENT REGION
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3 AOP[50-244/74-19 co 2.
9.
Corrective Action:
All four undervoltage relays were removed, one at a time, and the scale accumulation was removed and the plunger polished. Subsequent bench testing indicated freedom of movement of the plunger through the guide bearing without noticeable drag. Upon returning the devices to service, the applicable section of PT-9 procedure was performed to verify operability.
1 The Plant Cperations Review Committee convened on December 4,1974 and made the following recommendations:
a.
Maintenance surveillance to clean and calibrate these devices should be increased to at Icast every six months. The, pres ent schedule for cleaning and calibrating these devices is at least every refueling shutdown.
b.
Since relays 273 and 274 for each 4160 volt bus (llA and 11B) are mounted in a common case, a spare relay assembly of this type should be available to place in service while maintenance is being performed on a particular pair of relays. This will prevent having to leave one train of the Reactor Trip Undervoltage logic in the W
tripped mode during maintenance.
c.
The RG&E Electric System Protectior. Engineer should review the possibility of changing the type of relay used for this application.
em i
10.
Failure Data:
a.
As noted in 7. above, there has been one other failure with this type of relay which occurred on May 7.9, 1973. This was reported as Abnormal Cccurrence 73-1 on June 8,1973.
b.
Equipment Identification:
Manufacturer:
Westinghouse Type:
SV Style:
1876099 Range:
70-150 volts, 60 Hz i
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