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| {{Adams
| | #REDIRECT [[05000260/LER-1981-020-03, /03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51]] |
| | number = ML20004C650
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| | issue date = 05/29/1981
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| | title = LER 81-020/03L-0:on 810505,during Core Standby Cooling Sys Suppression Chamber High Level Surveillance Instruction, Level Switches Operated at Correct Setpoint,But Annuciator & Relays Failed to Operate.Cause by Failure of Relay 23AK51
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| | author name =
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| | author affiliation = TENNESSEE VALLEY AUTHORITY
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| | addressee name =
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| | addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
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| | docket = 05000260
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| | license number =
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| | contact person =
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| | document report number = LER-81-020-03L-01, LER-81-20-3L-1, NUDOCS 8106040388
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| | package number = ML20004C645
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| | document type = LICENSEE EVENT REPORT (SEE ALSO AO,RO), TEXT-SAFETY REPORT
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| | page count = 2
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| }}
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| | |
| =Text=
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| {{#Wiki_filter:.
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| e
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| : u. S. NUCLEA*, RQULATISY COMMiss1ON un am<
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| $ u d ''
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| .< i.lCENSEE EVENT REPORT l l l l l lPLEASE PRINT OR TYPE ALL REQUIRED INFoRMATIONI CONTRoLGLOCK l l e
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| i Il l lJO]@l%7 VA T Sil]@
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| l
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| [ojij l A l L l B l R l F l .! l@l 0 l 0 l - 10LICENSE l0l0 l 0 l 0 l- ] O l 0 l@]
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| NUMBEH 2 ', JG 4LsCENSE l1 l 1 TYPE LH;EN5th CGt >L te l',
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| r ,t e CON'T lol'l N 11@l 0 l 5 l 0 l 0 l 0 l 2 l 6 l 0e @j69 0 l EVENT 5 ] OATE O l 5 l 8 l1 @l REPORT 74 75 o l sOATEl 2 l a 80l g l i l@
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| l 4 60 61 OOCK ET NUveER EVENT OESCalPTION AND PRO 9ABLE CONSEQUENCES h) l Io t :l l During normal operation, while performing the CSCS supprussion chamber high level
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| [u;ij l surveillance instruction, level switches LS 73-57A and LS 73-57B operated at correct l n 4 i sett g t, but annunciator and relays failed to operate. There was no danger to Lhe i 1
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| [
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| i o 1., j j health or safety of the public. There were no redundant systems. No previous l
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| I o in i dimilar events.
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| I lo til i I
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| WO lota!I COYP vA LV E SYSTEM CAUSE CAUS#c SU8COCE COMPONENT CODE SUSCSCE iUECCE COJE CODE l_ o l > l A
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| I Cl El@ [E_J@ l A l@ l Rl El Ll Al wYl Xl@ W@ ]@
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| 9 to Ii 12 13 19 20 REVISION 4
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| S E QU ENTi A L OCCURRENCE REPORT
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| _ COCE TYPE NO.
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| REPORT NO.
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| d R NO
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| @ asg l2r8 il l EVENT YEAR l-l _ l 0] 2l 0] y lOl3l 23 23 lLl 33
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| [ -j 31
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| @J2.
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| 22 23 24 26 27 ATT AC Hv E N T NP R O-4 art 9E covP. CCMPCNENT AC TION FUTU84 E EFFECT SHUTDOWN SUSwTTED FCRu wes. SLPPL:Ea MANUFACTURER TAAEN ACTION ONPLANT METF.CO HOURS L^J@* l Z l@ l l@ B@
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| 43 l
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| 44 I l'81 I@
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| 47 J3 J4 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l
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| F R l Annunciator and relays were inoperable because relay 23AK51 failed. Relay 23AK51 This is considered a rancom failure, and i 1i 12 I Iwas replaced and tested successfully.
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| [
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| i i i .1 (no further recurrence control is required.
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| . Tennessee Valley Authority Form BF-17
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| * - ' Browns Ferry Nuclear Plant - B F 15 'l 3/24/81 LER SUPPLE'4 ENTAL INFORMATION
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| - BFRO-50 260 / sio20 . Technical Specification Involved ' table 4.2.B Reported Under TechnicalLSpecification' 6.7.2.b-(2) 5/5/81
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| ~
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| Date of Occurrence Time of Occurrence 0800 Unit 2
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| ' Identification and Description of- Occurrence:
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| Suppression chamber levul switches LS 73-57A and LS 73-57B operated'at correct setpoint, but annunciator and relays failed to operate.
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| Conditions Prior to' Occurrence:
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| * Unit i refueling outage.
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| Unit 2 at 100%
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| Unit 3 at 100%
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| Action specified in the Technical Specification Surveillance Requirements met-due to inopervble~ equipment. Descrioe.
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| Notified maintenance personnel and the relay was replaced.
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| Agreat -Cause of Occurrence:
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| Rc'.ay 23AK51 failed.
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| Analysis cf Occurrence:
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| There was no danger to the health or saiety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant
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| . chain of events.
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| Corrective Action:
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| . Replaced component and tested successfully.
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| Failure Data:
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| None
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| ~
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| * Retention : Period - Lifetime; Responsibility - Document Control Supervisor
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| . / f~
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| * Revision : r I w
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| . _ _ . . , _ , . . . -}}
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