05000260/LER-1979-023-03, /03L-0:on 791102,while Performing Surveillance Test,Torus Hydrogen Sensor Gave High Indication for 4% Hydrogen Calibr Gas.Caused by Model Sensor Failing in Conservative Directon.Design Change Planned to Replace Sys

/03L-0:on 791102,while Performing Surveillance Test,Torus Hydrogen Sensor Gave High Indication for 4% Hydrogen Calibr Gas.Caused by Model Sensor Failing in Conservative Directon.Design Change Planned to Replace Sys

ML18024B162
Person / Time
Site:	Browns Ferry
Issue date:	11/30/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B161	List: 05000260/LER-1979-023, Forwards LER 79-023/03L-0 05000260/LER-1979-023-03, /03L-0:on 791102,while Performing Surveillance Test,Torus Hydrogen Sensor Gave High Indication for 4% Hydrogen Calibr Gas.Caused by Model Sensor Failing in Conservative Directon.Design Change Planned to Replace Sys
References
LER-79-023-03L-01, LER-79-23-3L-1, NUDOCS 7912040483
Download: ML18024B162 (4)

LER-1979-023, /03L-0:on 791102,while Performing Surveillance Test,Torus Hydrogen Sensor Gave High Indication for 4% Hydrogen Calibr Gas.Caused by Model Sensor Failing in Conservative Directon.Design Change Planned to Replace Sys

Event date:
Report date:
2601979023R03 - NRC Website

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LlCENSEE EVENT REPORT

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0 60 61 DOCKET NUMBER 68 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES Q10 Durin normal o eration while erformin 69 EVENT DATE 9081130 0

74 75 REPORT DATE 80 surveillance testin the torus h dro en sen-

~03 sor gave a high indication for four ercent hydrogen calibration gas (T. S. 3. 7. H. 4).

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There are no redundant systems.

There was no hazard to the ublic health or safet Previous events:

296/796, 260/7821, 259/7820, 296/7719 and 259/7930.

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A desi n chan e has been a

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with a system manufactured by Hays-Republic.

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9 11 12 LOSS OF OR DAMAGETo FACIUTY Q43 TYPE

DESCRIPTION

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0730 Qnit 2

Iden',.ification and Desct~ition'of Occut rencc:

Unit 2 torus hydrogen sensor gave high indication for 4% hydrogen calibration gas.

Conditions Prior to Occurrence:

Unit 1 95%

Unit 2 87%

Unit 3 Refueling Outage A<'.ion 1<<c;fic<l i<> the Teci<n et<i Sp<;cification Survull;<nce Itcqutrcments r>et du '.>.:no "yet.lol<.'<')uil>m<.'r.t.

De."crib<<.

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

h <>p,<r e<i t Cause of O<.curr< ncc:

I Degradation of hydrogen sensor.

Analysis zf Occurrence:

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

Co re~'ttve Action:

Redundant sensor placed in service.

Entire system is to be replaced with Hays-Republic System.

F<<i!< t,: l>'<ta:

50-296/7719, 50-259/7820, 50-296/796, 50-260/7821, 50-259/7930.

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