05000296/LER-1979-012-03, /03L-0:on 790815,turbine First Stage Pressure Permissive Pressure Switch 1-81A Setpoint Exceeded Tech Spec by 8 Psig.Caused by Setpoint Drift.Switch Recalibr & Tested.Will Be Replaced by Analog Trip Units

/03L-0:on 790815,turbine First Stage Pressure Permissive Pressure Switch 1-81A Setpoint Exceeded Tech Spec by 8 Psig.Caused by Setpoint Drift.Switch Recalibr & Tested.Will Be Replaced by Analog Trip Units

ML18024B008
Person / Time
Site:	Browns Ferry
Issue date:	09/14/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B007	List: 05000296/LER-1979-012, Forwards LER 79-012/03L-0 05000296/LER-1979-012-03, /03L-0:on 790815,turbine First Stage Pressure Permissive Pressure Switch 1-81A Setpoint Exceeded Tech Spec by 8 Psig.Caused by Setpoint Drift.Switch Recalibr & Tested.Will Be Replaced by Analog Trip Units
References
LER-79-012-03L-02, LER-79-12-3L-2, NUDOCS 7909190380
Download: ML18024B008 (4)

LER-1979-012, /03L-0:on 790815,turbine First Stage Pressure Permissive Pressure Switch 1-81A Setpoint Exceeded Tech Spec by 8 Psig.Caused by Setpoint Drift.Switch Recalibr & Tested.Will Be Replaced by Analog Trip Units

Event date:
Report date:
2961979012R03 - NRC Website

text

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U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT

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LICENSE NUh'IBER Q

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Q 60 61 DOCKET NUMBER 68 69 EVFNT DATE 74 I5 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 Durin normal o eration while erformin SI 4 1,A-14 Turbine First Sta e Pressure 7

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Permissive ressure switch 1-81A set oint'was found to exceed the T.

S. limit s eci-'O

~OS fied in table 3.1.A.

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si There was no hazard to the ublic health or safet There are no redundant s stems.

Previous occurrences

259/798, 259/7816, 260/7916

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'27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD 4 PRIME COMP.

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0 Q26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

The Model B2TA12SS set oint had drifted out of the s ecified limit.

The switch was recalibrated and satisfactorily functionall tested.

The fre uenc of testin has been increased to'try to determine the cause of the setpoint drift. These will be re-3 placed with analog trip units in the future.

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11 12 LOSS OF OR DAMAGETo FACILITYQ43 TYPE

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'I'ennessee Valley Authority Drowns Ferry Nuclear'larrt Form BF-17 DF 15.2 1/10/79 LFR SUPPLEMENTAL INFORMA !ON BFRO.296 /

7912 Technical Specification Involved Reported Under Technics! Specification

6. 7. 2. b (1)

Date of Occurrence 8/15/7 Time of Occurrence Unit Identification and 1)escriptr<!n of Occur rence:

The setpoint for PS-1-81A, Turbine First Stage Pressure Permissive, was found to 'exceed the T.

S. limit by 8 psig.

Cof>ditions Prior to Occurrc:>c>>:

Normal Operation.

Action specified in the Technical Specificc"ticn Surveillance Requirements met due to inoperable erlu~iment.

Describe.

t Setpoint ad/usted to within T.

S. limits.

I

~Aarent Ceu "e or Occurrence:

Instrument Drift.

Analysis of Occurr ence:

None Cor!'Ic t ive Act.ion:

Recalibrated and functionally tested.

Performance, of 4.1.A.14 willverify other simil'ar switches.

F;rilure Dat.a:

259/798, 259/7816, 260/7916 and 296/797

~I(etention:

eriod - Lifetime; Responsibility

- Administrative Supervisor

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