05000296/LER-1981-012-03, /03L-0:on 810224,scram Discharge Level Switch (25 Gallon) Found 0.4% Above Setpoint During Performance of SI 4.1.A-8.Caused by Model SL-305-EI-X Level Switch, 3-LS-85-45E,setpoint Drift.Switch Recalibr

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/03L-0:on 810224,scram Discharge Level Switch (25 Gallon) Found 0.4% Above Setpoint During Performance of SI 4.1.A-8.Caused by Model SL-305-EI-X Level Switch, 3-LS-85-45E,setpoint Drift.Switch Recalibr
ML19350B827
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 03/13/1981
From:
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350B825 List:
References
LER-81-012-03L, LER-81-12-3L, NUDOCS 8103230798
Download: ML19350B827 (2)


LER-1981-012, /03L-0:on 810224,scram Discharge Level Switch (25 Gallon) Found 0.4% Above Setpoint During Performance of SI 4.1.A-8.Caused by Model SL-305-EI-X Level Switch, 3-LS-85-45E,setpoint Drift.Switch Recalibr
Event date:
Report date:
2961981012R03 - NRC Website

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4 EVENT CSSCRIPTION AND PROBABLE CONSEQUENCES h t o 121 l Du r'.n g the cerformance of SI 4.1.A-8. while the unit was shutdown. scram dis-haree I

level switch (25 gal) was found 0.4 percent above the setpoint (NRC3 80-14).

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lo,sl l public. Previous events: 259/8051, 259/7911, 260/8052.

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l t t o l l The model SL-305-EI-X. evel switch, 3-LS-85-45E, setpoint functionallv I

l i li l I switch float chamber was backflushed. the switch was recalibrated, No recurrence control action is planned.

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i 1/10/79 LER SUPPLEMENTAL INFORMATION NRC-B-80-14 3Fito 50 296/ 81012 Technical Specification involved NRC-B-80-14 Rep <.rted (Inder Technical Specification,

D3te..f Ocrurrence 2/24/81 Time of Occurrence 1132 Unit 3

Aden'.fication and Descriptien of Occurrence:

4 During performance of SI 4.1.A-8, scram discharge volume high water level switch LS-85-45E did not operate within limits.

A.F. 25.1 gal. A.L. 24.5 gal.

L'ondit:ons Prior to Occurrence:

Unit 1 at 99% power.

Unit 2 at 100% power, Unit 3 at 0% power.

4

\\ction sp+cified in the Technical Specification Surveillance Requi.ements met due to inonerable equipment. Describe.

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@p3 rent _Cause of Occurrence:

Instrument drift i

A n,alpi:L of OccuLrpnce:

There was no danger to the health or safety of the public, no release of activity, l

l no damage to plant or equipment and,no resulting significant chain of events.

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j Cory.ctive ' Action:

The switch -float chamber was backflushed. The switch was recalibrated, functionally tested and returned to service.

Failurc_ Data:

259/8051, 259/7911 and 260/8052.

  • i:nt ention :

Period - Lifetime; Responsibility - Administrative Supersisor

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