05000259/LER-1979-033-03, /03L-0:on 791129,LIS-3-184 Did Not Trip at Equal to or Greater than 544 Inches Above Vessel Zero.Caused by Instrument Drift.Instrument Recalibr & Tested at Proper Setpoint

/03L-0:on 791129,LIS-3-184 Did Not Trip at Equal to or Greater than 544 Inches Above Vessel Zero.Caused by Instrument Drift.Instrument Recalibr & Tested at Proper Setpoint

ML19257A318
Person / Time
Site:	Browns Ferry
Issue date:	12/28/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257A315	List: 05000259/LER-1979-033, Forwards LER 79-033/03L-0 05000259/LER-1979-033-03, /03L-0:on 791129,LIS-3-184 Did Not Trip at Equal to or Greater than 544 Inches Above Vessel Zero.Caused by Instrument Drift.Instrument Recalibr & Tested at Proper Setpoint
References
LER-79-033-03L, LER-79-33-3L, NUDOCS 8001030726
Download: ML19257A318 (2)

LER-1979-033, /03L-0:on 791129,LIS-3-184 Did Not Trip at Equal to or Greater than 544 Inches Above Vessel Zero.Caused by Instrument Drift.Instrument Recalibr & Tested at Proper Setpoint

Event date:
Report date:
2591979033R03 - NRC Website

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U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 87 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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2 IDurine nor al coernefen whila n a r m,i n g < T A 9 n?

LT9-3-184 did noe e ri n me amut i

leo or greater than 544 inches above vessel zero. Redundant systems were operable.

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Tcnnessee Valley Authority For:r. BF-17 Browns Ferry Nuclear Plant E F I fi.

10 79 LER SIf PPl.E.'IF.N T AL IN'FOPMATICN Bi RO.30-259 /

7933 T ehnical 3pecification Involve.1 3.2.B Repor ted Under Technical Specification

6. 7. 2.b. (2)

Date af Occurrence 11/2_9])9 Time of Occurrence _1330._._, Unit,_1_ _ _ __,

IdenCriention and Description'of Occurrence:

During normal operation while performing SI 4.2.B.2, LIS-3-184 (reactor low water level) did not trip at the designated setpoint. The switch actuated at 543.8 inches above vessel zero rather than equal to or greater than 544 inches.

Conditions ' Prior to Occurrence:

Unit 1 at 92%.

Unit 2 at 99%.

Unit 3 refueling.

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'c ol of 1 XIh\\1 Action specified in the Technical Specification Surveillr.nce Requirements met du' to inoperable equipment Describe.

Instrument was recalibrated and functionally checked within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

np,r. iren t Cauw of Occurrence:

Instrument drift.

A_n fy_,i s >f Occurrence.

No danger to the health or safety of the public; no significant resulting events.

Corrective Action

Recalibrated functionally tested and returned instrument to service.

Faik r.: D ita :

None.

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