ML20043H046

Ro:On 900503,heat Detection Sys Protecting East Reactor Coolant Pump Bay Disabled for More than 14 Days.Sys Disabled So That Detectors Could Be Removed to Facilitate Access to Reactor Coolant Pump During Maint Outage

ML20043H046
Person / Time
Site:	Calvert Cliffs
Issue date:	06/11/1990
From:	Denton R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9006210493
Download: ML20043H046 (2)

Text

. . -

,v' BALTIMORE  !

OAS AND ELECTRIC

-l

- CHARLES CENTER

• P.O. BOX 1475

• BALTIMORE. MARYLAND 21203 1475 l

l R. E. DENTON '

MANAnta cumn cons wcut. , June 11,1990 I PDwth PLAf,1 D(PARTMENY .

U. S. Nuclear Regulatory Commission r Washington,DC 20555 ATTENTION: Document Control Desk <

SUBJECT:

- Calvert Cliffs Nuclear Power Plant Unit No.1; Docket No. 50 317 Fire Detection Instrumentation Special Report Technical Specification 3.3.3.7. Action Statement b Gentlemen:

- Per the requirements of Technical Specification 3.3.3.7 Action Statement b, we hereby submit the attached Special. Report concerning inoperable fire detection instrumentation, specifically the  ;

detection system in the Unit 1 East and West Reactor Coolant Pump Bay in the Unit 1 Containment was inoperable for greater than 14 days.'

Should you have any further questions'regarding this matter, we will be pleased to discuss them with

, you.

truly yours,'

' t f -W  :

RED /JV/CRS/bjd .

- Attachment .

1 cc: -D. A. Brune, Esquire - .I J. E. Silberg, Esquire 1 R. A. Capra, NRC D. G. Mcdonald,'Jr., NRC -

T. T. Martin, NRC l L. E. Nicholson, NRC

'l l R. I. McLean, DNR l:

9006210493 900611 F PDR ADOCK.05000317 ' l

-S. PNU ,j (N

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, A'ITACIIMENT (1)

. FIRE DFTECTION INSTRUMENTATION FYSTEM SPECIAL REPORT IIACKGROUND l On May 3,1990 the heat detection system protecting the Unit 1 East Reactor Coolant Pump Bay was l

disabled. The system was disabled so the detectors could be removed which block access to the Reactor Coolant Pump (RCP). This was necessary to facilitate access to the RCP during the ongoing Unit 1 maintenance outage. On May 8,1990 the heat detection system protecting the Unit 1 West RCP Bay was disabled for the same reason. These heat detection systems are covered by Technical Specification 3/4.3.3.7 and are identified specifically in Technical Specification Table 3.3-

11. The appropriate Action Statement prescribed by Technical Specification 3.3.3.7 was entered upon disabling each system.

As specified by Technical Specification 3.3.3.7 Action Statement b, a Special Report n ust be submitted to the Commission pursuant to Technical Specification 6.9.2 if the detectors are not restored within 14 days. These detectors have been inoperable for an excess of 14 days and are currently scheduled to remain inoperable until approximately June 29, 1990. As requi cd, this Special Report addresses actions taken, the cause of the inoperability, and plans and scheilules for restoring the heat detection systems to an operable status.

AFFECTS ON UNIT OPERATIONS Unit 1 entered a maintenance outage on April 22,1990. Maintenance and inspection of the RCP's is included within the scope of this outage. In order to access the RCP's, the local heat detectors must ,

be removed. This requires the heat detection system for the RCP Bay to be disabled. Upon disabling a heat detection system, Action Statement a of Technical Specification 3.3.3.7 was entered, which for the case of heat detection system inside Containment, consists of monitoring Containment air temperature hourly or inspecting the Containment at least once every eight hours. It should be noted that the primary basis for the heat detection system in the RCP Bays is to detect a fire associated with the RCP lube oil. With the RCP inoperable, the fire potential of the lube oil is greatly reduced. The lube oil has a high flash point and must be heated and atomized to burn. '

Without the RCP's operating, the tube oil will remain well below its flashpoint.

PIANS AND SCllEDULES Currently the heat detection systems are scheduled to be restored on approximately June 29,1990 or prior to Unit l's return to service. In the interim, the compliance with the Technical Specification Action Statement a will be maintained.

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