05000324/LER-1982-127-03, /03L-0:on 821206,drywell Oxygen Concentration Exceeded 4% Following Core Auxiliary Cooling (CAC) Sys Failures.Caused by Ruptured Section of CAC Sys Piping. Damaged Piping Section Replaced

/03L-0:on 821206,drywell Oxygen Concentration Exceeded 4% Following Core Auxiliary Cooling (CAC) Sys Failures.Caused by Ruptured Section of CAC Sys Piping. Damaged Piping Section Replaced

ML20028D150
Person / Time
Site:	Brunswick
Issue date:	01/05/1983
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028D145	List: 05000324/LER-1982-127, Forwards LER 82-127/03L-0 05000324/LER-1982-127-03, /03L-0:on 821206,drywell Oxygen Concentration Exceeded 4% Following Core Auxiliary Cooling (CAC) Sys Failures.Caused by Ruptured Section of CAC Sys Piping. Damaged Piping Section Replaced
References
LER-82-127-03L, LER-82-127-3L, NUDOCS 8301170157
Download: ML20028D150 (2)

LER-1982-127, /03L-0:on 821206,drywell Oxygen Concentration Exceeded 4% Following Core Auxiliary Cooling (CAC) Sys Failures.Caused by Ruptured Section of CAC Sys Piping. Damaged Piping Section Replaced

Event date:
Report date:
3241982127R03 - NRC Website

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60 61 DOCK ET NUVBER 66 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IO I2l l During plant operation, following a CAC System failure. the Unit No. 2 drvwell I

[ o 13 l l oxygen concentration exceeded 4%.

The highest measured drywell oxygen concentration I lo l4 l l during this event was 4.25%.

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g g l was replaced and the CAC N7 g g l containment atmosphere was then inerted within 5.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br /> of the event to less than I

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LER ATTACHMENT - RO #2-82-127 Facility: BSEP Unit No. 2 Event Date:

December 6, 1982 This event occurred as a result of the inability of the CAC N i""#tI"8

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2 to supply makeup gaseous nitrogen to the primary containment of Unit No. 2.

While the CAC System was lined up for nitrogen makeup to the primary containment, it was discovered that an underground buried section of the CAC inerting system piping had ruptured.

Immediate temporary repairs to the damaged pipe section were begun to install a patch over the ruptured area of the affected pipe to allow CAC inerting operations to be recommenced.

Due to the time required to complete the repairs and the amount of air header leakage in the containment, the primary containment oxygen concentration of the unit was exceeded before completion of the temporary repairs to the damaged CAC line.

Within five hours and 45 minutes of exceeding four percent oxygen, the required temporary repairs to the CAC N inerting line w re c mplet d and the 2

oxygen concentration in the Unit No. 2 primary containment was returned to within specifications.