05000366/LER-1981-079-03, /03L-0:on 810822,torus-to-atmosphere Hi Data Processing Switch 2T48-N210 Found to Actuate Above Tech Spec Limit During Static O-ring Pressure Switch Calibr HNP-2-5240.Caused by Setpoint Drift.Switch Recalibr

/03L-0:on 810822,torus-to-atmosphere Hi Data Processing Switch 2T48-N210 Found to Actuate Above Tech Spec Limit During Static O-ring Pressure Switch Calibr HNP-2-5240.Caused by Setpoint Drift.Switch Recalibr

ML20010G577
Person / Time
Site:	Hatch
Issue date:	09/10/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010G571	List: 05000366/LER-1981-079, Forwards LER 81-079/03L-0 05000366/LER-1981-079-03, /03L-0:on 810822,torus-to-atmosphere Hi Data Processing Switch 2T48-N210 Found to Actuate Above Tech Spec Limit During Static O-ring Pressure Switch Calibr HNP-2-5240.Caused by Setpoint Drift.Switch Recalibr
References
LER-81-079-03L-01, LER-81-79-3L-1, NUDOCS 8109220240
Download: ML20010G577 (2)

LER-1981-079, /03L-0:on 810822,torus-to-atmosphere Hi Data Processing Switch 2T48-N210 Found to Actuate Above Tech Spec Limit During Static O-ring Pressure Switch Calibr HNP-2-5240.Caused by Setpoint Drift.Switch Recalibr

Event date:
Report date:
3661981079R03 - NRC Website

text

NRC FORM 3GG U.S. NUCLEAR REGULATORY COMMISSION (7 77)

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012; lWith the plant ir steady state operation at 1104 MWt and while pertorm-1 i O i 3, ling HNP-2-5240, Static O-Ring Pressure Sp.tch Calibration, the Torus-l0 pl I to-Atmosphere Hi DP Switch, 2T48-N210, was found to actuate at 17 inchesl iOis;lW,C. Vac.

Tech Specs 3.6.4.2 require actuation at _4.5 PSID or 14 inchek F6171 i W.C. Vac.

Reddndant Switch 2T48-N211 was found to be within tolerance. I l Plant operation nor the health and safety of the pr511c was affected.

I O 7 iOiRi dhis is a non-repetitive event.

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LER #:

50-366/1981-079 Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-366

Narrative

Report for LER 50-366/1981-079 On August 22,

1981, while the plant was in steady state operation at 1104 MWt and while performing HNP-2-5240, Static 0-Ring Pressure Switch Calibration, the Torus-to-Atmosphere High DP Switch, 2T48-N210, was found to actuate at 17 inches W.C.

Vac.

Tech Specs 3.6.4.2 require actuation at less than or equal to

.5 PSID or 14 inches W.C.

Vac.

This switch and its redundant switch 2T48-N2' ' control butterfly valves which are used in equalizing excessive cressure differences between the torus and the atmosphere which may result due to steam leaks withtr.

the drywell.

Failure of these switches may result in tacessive torus vacuum and possible _ damage to its penetration seals.

Redundant _ switch 2T48-N211 was found to be within tolerance.

Plant operation nor the health and safety of the public was affected.

This is a non-repetitive event.

The

cause

of this event has been attributed to setpoint drift.

The switch was recalibrated per HNP-2-5240, Static 0-Ring Pressure Switch Calibration and returned to service.

Since Unit 1 does not use the same type switch for this application, no generic problem exists.

4