05000296/LER-1981-037-03, /03L-0:on 810723,containment Atmosphere Monitor Dihydrogen Dioxygen Analyzer B Sample Return Valves Could Not Be Energized.Caused by Failed Solenoid Assembly FSV-76-67 Due to Shorted Bridge Rectifier & Coil

/03L-0:on 810723,containment Atmosphere Monitor Dihydrogen Dioxygen Analyzer B Sample Return Valves Could Not Be Energized.Caused by Failed Solenoid Assembly FSV-76-67 Due to Shorted Bridge Rectifier & Coil

ML20010C553
Person / Time
Site:	Browns Ferry
Issue date:	08/14/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C549	List: 05000296/LER-1981-037, Forwards LER 81-037/03L-0 05000296/LER-1981-037-03, /03L-0:on 810723,containment Atmosphere Monitor Dihydrogen Dioxygen Analyzer B Sample Return Valves Could Not Be Energized.Caused by Failed Solenoid Assembly FSV-76-67 Due to Shorted Bridge Rectifier & Coil
References
LER-81-037-03L-01, LER-81-37-3L-1, NUDOCS 8108200184
Download: ML20010C553 (2)

LER-1981-037, /03L-0:on 810723,containment Atmosphere Monitor Dihydrogen Dioxygen Analyzer B Sample Return Valves Could Not Be Energized.Caused by Failed Solenoid Assembly FSV-76-67 Due to Shorted Bridge Rectifier & Coil

Event date:
Report date:
2961981037R03 - NRC Website

text

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.I Durina nonnal operation. containment atmosphere monitor (CAM) H,,0,, analyzer o 2 (TTT1 l sample return valveis could not be energized. See T.S. 3.7.H.2.

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lVl0l3l0lg 34 35 36 37 40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h solenoid assembly FSV-76-67 failed l l__LO_) l Valcore Engineerina Corporation model V52630-529-1 ITTT1 I to ocerate due to a shorted bridge rectifier and coil. In addition, a voltage supplyi It I>I l wire was found loose due to a broken screw head. The solenoid assembly was replaced l See attached for l

@ l and SI 4.7.D.l.B-1(A) an? SI 4.7.H were successfully completed.

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BF 15.2 6/04-81 LER SUPPLEMENTAL INFORMATION BFRO-50-296/81037-Technical Specification Involved 3.7.H.2.

Reported Under Technical Specification

6. 7. 2.b. 2

• Date due NRC: 8/22/81 Date of Occurrence 7/23/81 Time of Occurrence: 0815 Unit 3

Identification and Description of Occurrence:

During normal operation, containment atmosphere monitor (CAM) H,0 analyzer 2

B sample return valves could not be energized. The solenoid le&d wire and relays R2, R5, and 86-76-92A were damaged.

Conditions Prior to Occurrence:

Unit 1 in refueling outage Unit 2 at 99%.

Unit 3 at 100%.

Action Specified in the Technical Specification Surveillance Requirements met

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due to inoperable equipment. Describe.

l 4

None Solenoid coils assembly for FSV-76-67 failed to operate Apparent Cause of' Occurrence:

due to a shorted bridge rectifier and coil. A voltage supply wire was found loose due to a broken screw head. Inadequate design information lead to improper flex conduit connections at FSV-76-67 which allowed the solenoid assembly to be exposed to torus j

environment, permitting corrosion. Corrosion on bridge rectifier failure possibly prevented dissipation of heat and contributed to rectifier f ailure. Screw was probably

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overtorqued by manufacturer.

Analysis 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 signi-ficant chain of events.

Corrective Action

Replaced FSV-76-67 solenoid assembly and relays R2, R5 and 86-76-92A. Flex conduit connections for FSV-76-63, 76-65, and 76-67 sealed by Flex connector at body end of taping with Scotch 70 and covered with Scotch 33+.

SI 4.7.D.l.B-1(A) and 4.7.H. were saccessfully completed.

FSV-76-67 was replaced.

valves inside the drywell on unit 3 will be checked during the next opportunity H0 22 Consideration is being given to moving these valves outside the for drywell entry.

torus and drywell.

the torus flex connectors will be replaced during the next refueling At a minimum, These valves are outside the torus and drywell on units 1 and 3.

outage.

Failure Data:

None t

Period -- Lifetime; Responsibility - Document Control Supervisor 4

Retention:

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