ML20217N658

Special Rept on Fire Detection,Deluge Sys & Fire Rated Assemblies During Period of 980303-25.Established Fire Watches Until Affected Equipment Is Returned to Operable Status

ML20217N658
Person / Time
Site:	LaSalle
Issue date:	03/30/1998
From:	Dacimo F COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9804090159
Download: ML20217N658 (3)

Text

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l March 30,1998 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. A555

Subject:

Special Report on Fire Detection, Deluge Systems, and Fire Rated Assemblies LaSalle County Station, Units 1 and 2 Facility Operating License NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374 This Special Report is submitted in accordance with LaSalle County Unit 1 and 2 Operating Licenses, NPF-11 and NPF-18 respectively, Appendix A, and Technical Specifications 3.3.7.9, 3.7.5.2, 3.7.6, and 6.6.C.

Technical Specification 3.3.7.9 requires, as a minimum, the fire detection instrumentation for each fire detection zone of Unit 1 and Unit 2 shown in Table 3.3.7.9-1 shall be OPERABLE whenever the equipment protected by the fire detection instrument is required to be OPERABLE, and requires the restoration of the instrJments to OPERABLE status within 14 days of being declared inoperable.

Technical Specification 3.7.5.2 requires the deluge and sprinkler systems of Unit 1 and Unit 2 shown in Table 3.7.5.2-1 shall be OPERABLE whenever equipment protected by the deluge / sprinkler systems are required to be OPERABLE, and requires the restoration of the system to OPERABLE status within 14 days of being declared inoperabic.

Technical Specification 3.7.6 requires all fire rated assemblies, including walls, floor / ceilings, cable tray enclosures and other fire barriers separating safety-related fire areas or separating portions of redundant systems important to safe shutdown within a fire area, and all sealing devices in the fire rated assembly penetrations (fire doors, fire windows, fire dampers, cable and piping penetration seals and ventilation seals) shall be OPERABLE at all times, and requires the restoration of the assembly to an OPERABLE status within seven days of being declared inoperable. i

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The inoperability of the fire detection instruments, deluge systems, and fire rated assemblies discussed below was planned in support of scheduled outage maintenance activities.

During the period of March 3,1998 through March 19,1998, Fire Detection Zones 1-7,1-27,2-24, and 2-27 had been out-of-service for a period greater than 14 days. Auxiliary Building Fire Detection Zones 1-7,1-27, and 2-27 were taken out-of-service on February 17, March 5, and February 23 of 1998 (respectively) to prevent false alarms during hot work activities (i.e., welding, cutting, and grinding) on the Auxiliary Electric Equipment Room (VE) ventilation system. Fire Detection Zones 1-7,1-27, and 2-27 are located on elevation 731' of the Auxiliary Building. Reactor Building Fire Detection Zone 2-24 was taken out-of-service on March 2,1998 to prevent false alarms during hot work activities (i.e., welding, cutting, and grinding) on the Unit 2 Standby Gas Treatment System Equipment Train. Fire Detection Zone 2-24 is located on elevation 820' of the Unit 2 Reactor Building. Fire Detection Zone 2-24 was retumed to an OPERABLE status on March 21,1998.

On March 16,1998, the fire detection instrumentation and deluge systems associated with the Control Room HVAC Supply Air Filter Unit (0VC01FA) and Emergency Makeup Filter Unit (OVC01SA), the Auxiliary Electric Equipment Room HVAC Room Supply Air Filter Unit (OVE01FA), as well as the Standby Gas Treatment System Equipment Train (2VG01S) had been out-of-service for a period greater than 14 days. The fire detection instruments, as well as the deluge systems, were taken out-of-service on March 2,1998, to allow scheduled work to ba performed on the affected filter unit or equipment train.

The fire detection instrumentation and deluge system associated with the Standby Gas Treatment System Equipment Train (2VG01S) were returned to an OPERABLE status on March 25,1998.

During the period of February 28,1998 through March 25,1998, various fire rated assemblies within the Auxiliary Building at elevations 731' and 749' were inoperable for a period greater than seven days. The fire barriers were declared inoperable to allow the installation of ventilation duct work and hangers, as well as to allow welding leads to be routed through fire rated assemblies in support of modifications to the VE ventilation system.

For the above identified areas, fire watches were estatslished in accordance with Action Statement 'a' of Technical Specifications 3.3.7.9,3.7.5.2, and 3.7.6, as applicable, to inspect the affected areas while the equipment is inoperable. The fire watches ensure detection capability is available, and minimize potential damage to safety related equipment, while the affected fire protection equipment is inoperable. The fire watches will remain in place until the affected equipment is retumed to an OPERABLE status. Modifications to the VE ventilatiois system are scheduled to be completed prior to Unit 1 startup, a

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If there are any questions or comments conceming this letter, please refer them to Perry Bames, Regulatory Assurance Manager, at (815) 357-6761, .

extension 2383.

Res I, N

Fred Dacimo Site Vice President LaSalle County Station l

cc: A. B. Beach, NRC Region lil Administrator M. P. Huber, NRC Senior Resident inspector - LaSalle D. M. Skay, Project Manager - NRR - LaSalle F. Niziolek, Office of Nuclear Facility Safety - IDNS 1

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