05000259/LER-1981-004-03, Standby Gas Treatment Sys Train C Relative Humidity Heaters Declared Inoperable.Caused by Dwyer Photohelic Pressure Switch/Gage Circuit Hh & Ite Imperial Relay Contact Block Malfunction

Standby Gas Treatment Sys Train C Relative Humidity Heaters Declared Inoperable.Caused by Dwyer Photohelic Pressure Switch/Gage Circuit Hh & Ite Imperial Relay Contact Block Malfunction

ML19345G893
Person / Time
Site:	Browns Ferry
Issue date:	04/17/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345G891	List: 05000259/LER-1981-004, Forwards Updated LER 81-004/03L-1 05000259/LER-1981-004-03, Standby Gas Treatment Sys Train C Relative Humidity Heaters Declared Inoperable.Caused by Dwyer Photohelic Pressure Switch/Gage Circuit Hh & Ite Imperial Relay Contact Block Malfunction
References
LER-81-004-03L, LER-81-4-3L, NUDOCS 8104220664
Download: ML19345G893 (2)

LER-1981-004, Standby Gas Treatment Sys Train C Relative Humidity Heaters Declared Inoperable.Caused by Dwyer Photohelic Pressure Switch/Gage Circuit Hh & Ite Imperial Relay Contact Block Malfunction

Event date:
Report date:
2591981004R03 - NRC Website

text

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454C FORM O UPDATE REPORT - PREVIOUS REPORT DATP 2/9/81 U. S. NUCLEAQ OECULATOQY COMMISSION (7 7H LICENSEE EVENT REPORT G.

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S to 61 DOCstET NuYSER 68 69 EvtNT DATE le it REPORT CATE 80 EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES l During normal operation an operator o served that SBGT train "C" relative humidity

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g, heaters did not function properly; SBCT train "C" declared inoperable at 1400.

g (T.S. 3.7.B.1).

This system is common to units 1, 2, and 3.

There was no effect g

on the health or safety of the public. SBGT trains A and B were operable.

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o g,; Previous events

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CAUSE

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40 el 42 43 44 47 CAUSE DESCRIPTICN AND CCRRECTIVE ACTIONS

A Dwyer photohelic pressure switch gage circuit HH and an ITE Imperial relay gigy; l ' l' I Lc ntact block malfunctiened. SI 4.7.B.3.c was performed within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and the g

SBGT train "C" was returned to service g

,,,,, g malfisnctioning components were repaired.

,,,3, ; at 0645 on January 26, 1981. No recurrence control is planned.

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Fcrm BF-17 Tenr.cs::ce valley Authority BF 15.2 Brokns Ferry Nuclear Plant 1/10/79 LER SUPPLDIENTAL INFORMATION 37B1 DFRO-50 259 /

8104 R1 Technical Specification involved 6.7.2.b Reported Under Technical Specification 1/25/81 Time of Occurrence 1400 Unit 1

Date of Occurrence Identification and Description of Occurrence:

An operator observed that SBGT train "C" relative humidity. heaters'did not function properly. SI 4.7.B.3.c was performed within two hours, to verify the,other two trains were operable.

Conditions' Prior to Occurrence:

Unit 1 at 85% power.

Unit 2 at 98% power.

Unit 3 at 98% power.

Action specified in the Techr.ical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Performed required surveillance testing.

i t ppa ent C.tuse of Occurrence:

\\

Component failure Analysis of Occurrence:

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

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events.

Corrective Action

Repaired defective' component and rett med the system to service at 0645 on January 26, 1981.

Failure Data:

NA

• Retention :

eriod - Lifetime; Responsibility - Administrative Supervisor

• Revision:

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