ML20085D494

Special Rept 91-006:on 910827,low Pressure CO2 Distribution Sys for Auxiliary Bldg Isolated & Declared Inoperable Due to Leak from Underground Line.Damaged Line Replaced & Placed Into Svc

ML20085D494
Person / Time
Site:	Farley
Issue date:	10/08/1991
From:	Woodard J ALABAMA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-006, 91-6, NUDOCS 9110160222
Download: ML20085D494 (2)

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U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Joseph H. Farley Nuclear Plant, Unit 2 Special Report 91-006 Low Pressure CO2 Distribution System for Unit 2 Auxiliary J!uildina inoperable Gentlemen:

In accordance with the requirements of Technical Specification 3,7.11.3, the enclosed Special Report No.91-006 is submitted.

Respectfully su itted, ,

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Special Report No.91-006, Unit 2

" Low Pressure C02 Distribution System for Unit 2 Auxiliary Building inoperable" At 1741 on 8-27-91, a CO2 leak was discovered coming from an underground line. The CO2 was leaking into a break room adjacent to the Primary Access Point (PAP). The leak was coming from the 13 ton Cardox unit located in the basement of the Unit I turbine building. All potentially affected areas were surveyed and the break room and PAP were evacuated.

At 1817 on 8-27-91, the 13 ton Cardox unit was isolated and declared inoperable. The leak was found to be on the branch line from the 13 ton ur.it to the Unit 2 auxiliary building electrical switchgear and Unit 2 auxiliary building C02 hose reels. All required firewatches were established within one hour of the 13 ton unit isolatian The leaking line was capped allowing the remainder of the low pressure CO2 system to be placed back in service at 0320 on 8-31-91. The damaged line was not reused. Another line has been installed to supply the Unit 2 auxiliary building. The replacement 002 line has been placed into service.

Due to the increased length of the replacement line, resetting of discharge timers on the Unit 2 auxiliary building CO2 systems supplied by the line was required prior to declaring the systems operable. The timers have been successfully reset on fourteen of the nineteen affected systems. These fourteen systems have been returned to operable status and the firewatches removed. However, satisfactory testing could not be completed on five of the nineteen systems. Replacement discharge timers are required on four of the remaining five systems. for the fifth system, a design evaluation of the existing condition is pre:ently being performed. The existing condition will be justified or the system modified prior to its return to service. Procurement of replacement timers and performance of the design evaluation required to return these remaining five systems to operation is expected to be completed by the end of November.

Technical Specification 3.7.11.3 requires the low pressure C02 system to be returned to operable status within 14 days or a Special Report must be submitted within the following 30 days. Therefore, this Special Report is being submitted. All Technical Specification action statement requirements for the low pressure CO2 system are being met.