05000313/LER-1980-039-03, /03L:on 801028,exhaust Fan VEF-37A on Lead Hydrogen Purge Sys Tripped.Caused by Short in Control Sys Due to High Resistance Connections at Solenoid Valve Terminals.Rectifier & Control Fuse Replaced & Leads Cleaned: Difference between revisions

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{{Adams
#REDIRECT [[05000313/LER-1980-039-03, During Monthly Surveillance on Lead H Purge Sys,Exhaust Fan VEF-37A Tripped.Caused by Short in Control Sys Which Caused Rectifier to Fail & Fuse to Blow]]
| number = ML20002B108
| issue date = 11/25/1980
| title = /03L:on 801028,exhaust Fan VEF-37A on Lead Hydrogen Purge Sys Tripped.Caused by Short in Control Sys Due to High Resistance Connections at Solenoid Valve Terminals.Rectifier & Control Fuse Replaced & Leads Cleaned
| author name = Bramlett L
| author affiliation = ARKANSAS POWER & LIGHT CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
| docket = 05000313
| license number =
| contact person =
| document report number = LER-80-039-03L-01, LER-80-39-3L-1, NUDOCS 8012090445
| package number = ML20002B099
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = /03L:on 801028,exhaust Fan VEF-37A on Lead Hydrogen Purge Sys Tripped.Caused by Short in Control Sys Due to High Resistance Connections at Solenoid Valve Terminals.Rectifier & Control Fuse Replaced & Leads Cleaned
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000313
| LER year = 1980
| LER number = 39
| LER revision = 3
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
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NRC FORM 356 U S NUCL E AR REGUL ATO9Y @MM117.lON
., (?-778 LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCl(: l l l l l l l iPLE ASE PRINT OR TYPE ALL REQUIREDINFORMATION) s t
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EVENT DESCRIPTION AND PROBA8LE CONSEQUEN;ES h f oTT11 Durino a monthly surveillance on the lead Hydrogen purge system, the
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loialI exhaust fan (VEF-37A) tripped.
The standby Hydrogen purge system was rirTTl Ioperable. There have been no similar occurrences.
Reportable per i
ioisiiT.S. 6.12.3.2.(b).
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li lo l 1 The cause of the exhaust fan trio was determined to be from a short in I
i the enntrol system.
The short occurred due to high resistance connec-I i i Lu U i tions at the teminals of the solenoid valve which suoDlies service wateri u L.J l to seal the fan.
This caused the valve rectifier to fail and in turn i
I caused the control transfomer fuse to blow.
Since (see attachment) i
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L.E.R. # 50-313/80-039 November 25, 1980 l
ANO Unit 1 Cause Description & Corrective Action the fan and solenoid valve are powered through the same control transformer fuse, the fan tripped.
The rectifier and control fuse were replaced.
The solenoid valve was inspected, leads were cleaned and the valve tested.
The system was tested and proved operable.
}}
 
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