05000259/LER-1979-030-03, /03L-0:on 791023,during Surveillance Testing,Torus Hydrogen Sensor Gave High Indication for 4% Calibr Gas. Caused by Degradition of Sensor.Redundant Sensor Placed in Svc

/03L-0:on 791023,during Surveillance Testing,Torus Hydrogen Sensor Gave High Indication for 4% Calibr Gas. Caused by Degradition of Sensor.Redundant Sensor Placed in Svc

ML19210D644
Person / Time
Site:	Browns Ferry
Issue date:	11/21/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D637	List: 05000259/LER-1979-030, Forwards LER 79-030/03L-0 05000259/LER-1979-030-03, /03L-0:on 791023,during Surveillance Testing,Torus Hydrogen Sensor Gave High Indication for 4% Calibr Gas. Caused by Degradition of Sensor.Redundant Sensor Placed in Svc
References
LER-79-030-03L, LER-79-30-3L, NUDOCS 7911270422
Download: ML19210D644 (2)

LER-1979-030, /03L-0:on 791023,during Surveillance Testing,Torus Hydrogen Sensor Gave High Indication for 4% Calibr Gas. Caused by Degradition of Sensor.Redundant Sensor Placed in Svc

Event date:
Report date:
2591979030R03 - NRC Website

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CON'T o i 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 7

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l o 12 l l During normal operation while performing surveillance testing the torus hydrogen sen-3.7.H.4). There are l

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Browns l'erry Nuclear Plant B F 15. 2 1/10/79 LER SUPPLEMENTAL INFORMATION BFitO 259 / 7930 Technical Specification involve;d 3.7.H.4 Reporteil Under Technical Specification 6.7.2.b.2 Date of Occurrence 10/23/79 Time of Occurrence 1315 Urit 1

Identification and Description ~of Occurrence:

Unit 1 torus hydrogen sensor gave high indication for 4% calibration gas.

Conditicas ' Prior to Occurrence:

Unit 1 98%

Unit 2 98%

Unit 3 Refueling Outage Action specified in the Technical Specification Surveillanca Requirements met due to inoperable equipment. Describe.

T. S. allows operation for 30 days with sensor out of service.

Ar, parent Cause of Occurrence:

Degradation of hydrogen sensor.

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Analvsis of Occurrence:

There was no damage to plant equipment, no injury to personnel, no daner t health or safety of the public, no. reduction in power generation.

Correctim Action:

Redundant sensor placed in service. Entire system is to be replaced with Hays--Republic System.

Failure D.ita:

50-296/7719, 50-259/7820, 50-296/796, 50-260/7821.

• Reten tion :

Period - Lifetime; Responsibility - Admini.:trative Supervbor

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• Revision.

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