05000324/LER-1981-014-03, /03L-0:on 810206,during Normal Operation, Suppression Pool to Reactor Bldg Vacuum Breaker Butterfly Valve 2-CAC-V17 Opened Outside Tech Spec Primary Containment Pressure Limits.Caused by Instrument Set Point Drift

/03L-0:on 810206,during Normal Operation, Suppression Pool to Reactor Bldg Vacuum Breaker Butterfly Valve 2-CAC-V17 Opened Outside Tech Spec Primary Containment Pressure Limits.Caused by Instrument Set Point Drift

ML19345G582
Person / Time
Site:	Brunswick
Issue date:	03/05/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345G576	List: 05000324/LER-1981-014, Forwards LER 81-014/03L-0 05000324/LER-1981-014-03, /03L-0:on 810206,during Normal Operation, Suppression Pool to Reactor Bldg Vacuum Breaker Butterfly Valve 2-CAC-V17 Opened Outside Tech Spec Primary Containment Pressure Limits.Caused by Instrument Set Point Drift
References
LER-81-014-03L-01, LER-81-14-3L-1, NUDOCS 8104070553
Download: ML19345G582 (2)

LER-1981-014, /03L-0:on 810206,during Normal Operation, Suppression Pool to Reactor Bldg Vacuum Breaker Butterfly Valve 2-CAC-V17 Opened Outside Tech Spec Primary Containment Pressure Limits.Caused by Instrument Set Point Drift

Event date:
Report date:
3241981014R03 - NRC Website

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8 60 65 ooCKET NUV6ER 6d 69 EVENT oATE 74 75 REPORT oATE 80 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h lDuring normal operation, the suppression pool to Reactor Building vacuum breaker but-l o 2 l terfly valve, 2-CAC-V17 opened with a primary containment pressure of.4 psi and a l

o 3 m l negative secondary containment pressure. The valve was immediately closed and the l

g l vacuum breaker was declared inoperable as required by technical specifications.

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g lThis event did not affect the health or safety of the publi.C.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27

]The instrument set point of the valve auto-open actuation switch, 2-CAC-DPS-4423 l

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Facility: BSEP Unit No. 2 Event Date: 2-6-81 This butterfly valve is the isolation valve located downstream of the torus-to-Reactor Building vacuum breaker and is normally in the closed position. On a i

pressure of 0.t.5 + 0.05 psid, with the torus negative with respect to the Reactor Building, this valve will automatically open 411cwing the vacuum breaker to equalize the torus-to-Reactor Building pressure differential. This valve i

opening when it did was in the conservative direction.

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As there is no history of similar events involving these valves, this is considered an isolated event and no further action is required.

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