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| {{Adams
| | #REDIRECT [[05000296/LER-1980-027-03, /03L-0:on 800714,while Performing Surveillance Instruction 4.5.b.1.d,RHR Pump Motor 3D Tripped on Instantaneous Overcurrent on Phase a When Started.No Cause Stated.Relay Setpoint Change Being Investigated]] |
| | number = ML20003A635
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| | issue date = 01/29/1981
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| | title = RHR Pump 3D Motor Tripped on Instantaneous Overcurrent.Caused by Dc Offset Due to High Saturation of CT Increasing Current Monitored.Motor Meggered,Potted & Bridged.Rhr Relay Settings Revised
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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 = 05000296
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| | license number =
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| | contact person =
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| | document report number = LER-80-027-03X, LER-80-27-3X, NUDOCS 8102040501
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| | package number = ML20003A634
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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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| {{LER
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| | Title = RHR Pump 3D Motor Tripped on Instantaneous Overcurrent.Caused by Dc Offset Due to High Saturation of CT Increasing Current Monitored.Motor Meggered,Potted & Bridged.Rhr Relay Settings Revised
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| | Plant =
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| | Reporting criterion =
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| | Power level =
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| | Mode =
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| | Docket = 05000296
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| | LER year = 1980
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| | LER number = 27
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| | LER revision = 3
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| | Event date =
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| | Report date =
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| | ENS =
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| | abstract =
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| }}
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| =text=
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| {{#Wiki_filter:_-
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| 4 60 69 GoCKET NuwesR es 69 EVENT Dart 74 76 REPORT DAf t 8f/
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| EVENT DESCRtPTION AND PROSASLE CONSEQUENCES h l During normal operation while performina SI 4.5.B.1.d.
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| 3D RHR pump motor tripped o 2 o 2 l on instantaneous overcurrent on "A" phase when started. Reference T.S. 3.5.B.3.
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| g l Remaining RHR pumps. CSS and diesel generators operable. There was no danger l
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| o 5 l co health or safety of public. No previous occurrences.
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| CAUSE DESCRIPTION ANDCORRECTIVE ACTIONS h i o l RHR pump motor tripped on instantaneous overcurrent. Motor was meggered, Hi l potted and bridged. Relay setting checked in tolerance. Traces of starting l
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| i i l current show DC offset caused by esturation of CT to be higher than anticipated, l increasing current monitored by relay. Settings for RHR relays associated with j
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| l this lea have been revised.
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| ==DESCRIPTION==
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| ==DESCRIPTION==
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| :- Tednei.ree Valley Authority Form 3F-17 Brown:, Ferry Nuclear Plant BF 15.2 1/10/73 LER SUPPLEMENTAL INFORMATION 3FitO-LO. 296 / 80027 Technical Specifteation involved 3.5.B.3 Reported Under Technical Specification,, 6.7.2.b. (2)
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| Date.; Occurrence 7/14/80 Time of Occurrence 1855 Unit 3
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| f_@li.!'fj:3titn__and Descrir. tion 'of Oecurren c:
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| 3D RHR pump motor tripped on instant:aneous overcurrent on "A" phase when started while performing SI 4.5.B.I.d. | |
| P i _r t 0:carrt.e.
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| I 2
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| Unit 1 0 77%
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| Unit 2 0 65%
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| I'ait 3 @ 45%
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| 'ce :
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| . ;.ncaitd in the Technical Specification Surveillance Ltyutreacnts met dile * - -".6, Dew:thle #$guipmen t. Describe.
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| The remaining RHR pumps (LPCI mode), CSS and diesel generators verified operable.
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| [. 3., -
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| a- | |
| . '' Ot. u r :..n u : | |
| RHR pump motor tripped out on instantaneous overcurrent.
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| S.
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| *nect:rronce.
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| There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.
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| l l
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| Cr.rrectico Act ion :
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| 14eggered. Hi potted and bridged motor, no problems found. Checked instantaneous overcurrent relay setting and found within tolerance. Oscillograph traces of the starting current show that the DC offset caused by the saturation of the CT to be higher than anticipated. This increases the instantaneous current i
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| I monitored by the instantaneous overcurrent relay. Settings for RHR relays associated with this LER have been revised and documented by PSO on relay setting sheets.
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| I'm.t t. _u.a.f.t :
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| :- g 91,:tr n tion :
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| Period - Lifetime; Responsibility - Administrative Supervisor C\\
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| *Revrw,n:
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| \\7 i
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| }
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| }}
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| {{LER-Nav}}
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