ML20043F791
| ML20043F791 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 06/13/1990 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9006180151 | |
| Download: ML20043F791 (2) | |
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BAL.TIMORE GAS AND ELECTRIC CHARLES CENTER e P.O. BOX 1475 e BALTIMORE, MARYLAND 21203 1475 R E. DENTON cmi/c'S',I uea A.
June 13,1990 POwth PLANT DgeAmtetNt I
U. S. Nuclear Regulatory Commission
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Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Fire Suppression Water System Special Report Technical Specification 3.7.11.1. Action Statement a i
Gentlemen:
Per the requirement o'f Technical Specification 3.7.11.1 Action !.atement a, concerning the Fire Suppression Water System, we hereby submit the attached Special Report. Specifically, the subject of the Special Report is the inoperability of the Diesel Fire Pump in excess of seven days.
Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, h
I MN I
RED /JV/CRS/bjd Attachment cc:
D. A. Brane, Esquire L
J. E. Silberg, Esquire R. A. Capra, NRC c._
L D. G. Mcdonald, Jr., NRC 4
T. T. Martin, NRC i:
L E. Nicholson, NRC L
R. I. McLean, DNR L
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AITAQIMENT 0) 1
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FIRE SUPPRESSION WATER SYSTEM SPECIAL REPORT i
HACKGROUND l
On May 7,1990 the Diesel Fire Pump was removed from service to perform scheduled maintenance.
While m the process of isolating the fire suppression water system from tne Diesel Fire Pump, an Operator inat vertently cycled the relief valve. This action was discovered prior to returning the fire pump to service after the scheduled maintenance. While resetting the rehef valve, a discrepancy in the method of attachment of the relief valve to the flanged pipe connection was noted. An engineering evaluation was performed and found the existing attachment configuration to be adequate.
The Diesel Fire Pump was considered inoperable until a capacity test to verify the performance after the maintenance could be conducted. The test could not be performed until the relief valve attachment was evaluated and the relief valve itself reset. After the relief valve was readjusted, the Diesel Fire Pump was tested and returned to service on June 5,1990. Since the Diesel Fire Pump was inoperable for an excess of seven days, Technical Specification 3.7.11.1 Action Statement a requires a Special Report to be prepared and submitted to the Nuclear Reguh, tory Commission.
This Special Report outline, plans and procedures to be used to provide for the loss of the fire pump redundancy and fulfills tb.: Technical Specification Action Statement.
EFFECT ON UNIT OPERATIONS When the Diese, Fire Pump was first removed from service for routine mainte tana, a valve was opened which cross-connects the plant fire main with the office complex fire main. This provides for adequate redundancy in that the Diesel Fire Pump is rated for 2500 gallons per minute (gpm) at 125 psig, and the office complex is supplied by two fire pumps, each with a rating of 1500 gpm at 125 psig.
Therefore, the total flow capability of the office fire main is greater than the Diesel Fire Pump in the plant. After the Diesel Fire Pump overhaul was completed (on approximately May 11,1990), this pump was capable of operating if needed in an emergency by manually opening the isolation valves.
Therefore at no time was the overall level of fire suppression water supply capabilities reduced.
During the time the Diesel Fire Pump was inoperable, Unit I was in MODE 5 and Unit 2 was defueled.
Prior to the pump being returned to service the relief valve was adjusted to its proper setting and the Diesel Fire Pump satisfied its test acceptance criteria at rated flow and pressure.
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