ML20005B127

LER 81-030/01T-0:on 810616,turbine First Stage Permissive Switches PS-1-81A & B & PS-1-91A & B Were Found Above Tech Spec Limit.Caused by Barksdale Model B2T-A12SS Setpoint Drift.Switches Reset

ML20005B127
Person / Time
Site:	Browns Ferry
Issue date:	06/29/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005B126	List: ML20005B125 ML20005B127
References
LER-81-030-01T-01, LER-81-30-1T-1, NUDOCS 8107060342
Download: ML20005B127 (2)

Text

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DiT~] {__Dtiring, normal operation, while performing turbine first stage pressure permissive (SI 4.1. A-14) turbine first stage permissive switches PS-1-81A and B and PS-1-91Al E E [ test _

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~ EJ4] Land B were found an average of 10.7 percent above the limits of T.S. table 3.1. A.

There were no redundant  ;

E LThere was no danger to the health or safety of the public.

BFRO-50-259/78016, 79008, 80053; 260/79016, g

[j_@ l systems. Previous similar events:

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^[n l il l 79017, 79024, 80020, 80057; 296/ 79007, 79012, 30022, 80030, 80045, 81017, 81023.

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[ i I o ' [_The Barksdale bourdon tube pressure switch model B2T-A12SS setpoints had drif ted.

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,;.,jI completed. Design change request 1398 has been initiated to replace these switches g

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OTHER $f A TUS is OV HY DISCOVERY DESCRIPTION

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rennessee Valley Aathority Form IIF 17.

Browns Ferry Nuclear Plant BF 15.2 6/04/81 l F.R SUPPI.F. MENTAL, INFORMATION Technical Specification inv<>!ved . Table _3 A A BFitO40~.._290 /._81030.

lleported Under Technical Specification _6 7 2 AO) *Date due NRC:__6/30/81_

Unit 3 Date of Occurrence ._ hL1h/6L_ Time of Occurrence __0830 Identification and Description of Occurrence: During performance of SI 4.1.A-14 PS-1-81A and B and PS-1-91A and B f ailed to operate within T.S. limits. The as found was: .PS-1-81A,187 psi; PS-1-81B,185 psi; PS-1-91A,183.5 psi, PS-1-91B, 184 psi. The above values include a 12.6 psig water leg. T.S. table 3.1.A setpoint is 1154 psig.

_ Conditions Prior to Occurrence:

. Unit 1 refueling outage Unit 2 maintenance outage Unit 3 at 98%

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe. _

None Apparent Cause of Occurrence:

Drift of the setpoint. This drift historically seems to occur during times of the year when there are seasonal weather changes. Application of these switches are marginal.

An:3_ lysis of Occurrence.

There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action:

The switches were reset to the proper values and SI 4.1.A-14 was satisfactorily completed. Design change request 1398 has been initiated to replace these switches with an analog transmitter with a trip switch. Setpoint has been made more conservative. As interim correction action we are investigating another more applicable switch.

Failure Data: BFRO-50-259/78016, 79008, 80053; 260/79016, 79017, 79024, 80020, 296/79007, 79012, 80022, 80030, 80045, 81017, 81023.

80057; i_o_n_:Per >d - I.if : time; llesponsibility - Document Control Supervisor R e_t en_t_

tllevision: _ _ __

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