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| {{Adams
| | #REDIRECT [[05000321/LER-1981-052-03, /03X-1:on 810621,LPCI Inverter B R44-S003 Tripped, Resulting in Loss of Power to Suction & Discharge Valves & LPCI Injection Valve.Caused by Defective Thermal Temp Switch in Inverter Leg.Switch Replaced]] |
| | number = ML20009E713
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| | issue date = 07/09/1981
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| | title = /03L-0:on 810621,low Pressure Core Injection B Inverter R44-S003 Tripped on High Temp & Inverter 2R44-S003 Tripped While Backseating Recirculation Suction & Discharge Valves.Cause of R44-S003 Attributed to Defective Switch
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| | author name = Coggin C
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| | author affiliation = GEORGIA POWER CO.
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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 = 05000321
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| | license number =
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| | contact person =
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| | document report number = LER-81-052-03L-01, LER-81-52-3L-1, NUDOCS 8107280382
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| | package number = ML20009E704
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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 = /03L-0:on 810621,low Pressure Core Injection B Inverter R44-S003 Tripped on High Temp & Inverter 2R44-S003 Tripped While Backseating Recirculation Suction & Discharge Valves.Cause of R44-S003 Attributed to Defective Switch
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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 = 05000321
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| | LER year = 1981
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| | LER number = 52
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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:NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)
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| LICENSEE EVENT REPORT control block: l l
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| l l
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| l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6
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| lo l i l l G l A l E l I l H l 1 l@l 0 l 0 l 10 l 0 l 0 l 0 l 0 l-l 0 l 0 l@l 4 Il l1 11 l 1 l@l l
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| l@
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| 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 con'T "E" E I L l@l 015101010131211 l@l 01612 Il i 811 l@l 017 l Ol 918 l 1 l@
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| lolil S uR 7
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| 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT oESCRIPTioN AND PROBABLE CONSEQUENCES h lo121l'B' LPCI inverter R44-S003 tripped on 4 separate occasions on high temp l [o i3i lresulting in loss of power to
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| 'B' recirc suction and discharge valves l
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| lo 141 land LPCI injection valve (making RHR B loop inop).
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| 'B' LPCI inverter l
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| Iolsi12R44-S003 tripped while separately backseating rectrc suction and dis-I lo is i Icha rae valves 2831-F023B and F0318. respectively.
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| The recirc valves andl 1o171ILPCI injection valve had no power making RHR B loop inop.
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| There were I
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| lol81 Ino effects upon public health and safety due to':iis. event.
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| I 80 7
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| 8 9 E
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| OE SU C E COMPON ENT CODE SUSCOD'E S
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| E Lol9l l E I D l@ l_E_j@ l G l@ lG lE IN lE lR lA l@ l F l@ l_Z_J @
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| '7 8
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| 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCS
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| :- REPORT REVISION EVENT YE AR R EPORT NO.
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| CODE TYPE N O.
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| @ y"LER/RO1811 l l-l l 01 Sl 21 W
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| l01 31 W
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| l-l l01 ug E
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| 21 22 23 24 26 27 28 29 30 31 32 K N AC ON P T
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| ME HOURS S8 i FC 8.
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| SUP L MANUF RER lAl@lEl@
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| 33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPT!oN AND CORRECTIVE ACTIONS 11101ITriooina of R44-S003 was attributed to defective switchles) in the in-l I
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| 11 111 Ivorter lools )
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| These switches will ha ronlaced tn nrovant recorronco lii2i lof this problem.
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| Cause for 2R44-S003 could not be determined since all I m l alarms were reset and not noted.
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| Further investigation will be per-l 12 141 Iformed when Unit 2 has an outage of sufficient duration to do so.
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| I 7
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| 8 9 80 ST
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| % POWER OTHER STATUS dis O RY DISCOVERY DESCRIPTION Ii I5 I lE_J@ 10 I 7 l 2 l@l NA l
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| l Al@l Operator Observation l
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| ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT CF ACTIVITY LOCATION OF RELEASE I1 16l [_L} @ [Lj @ l NA l
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| l NA l
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| 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMSER TYPE
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| | |
| ==DESCRIPTION==
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| li l 71 101 O l O l@l Z l@l NA l
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| 2 u
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| a PERSONee't iNau'R,,,
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| NUMBER DESCRIP TION li la l l Ol 01 Ol@l NA l
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| 7 8 9 11 12 80 TYPE DESCR PTION R l Zl@l NA l
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| 8 9 10 80 PUBLICITY 8107280382 810709 NRC USE ONLY ISSU ED PDR ADOCK 05000321 121 o ] [JJ@ DESCRIPTION l
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| S PDR l
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| l l l l l l l l l l l l I ;,
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| 7 8 9 10 68 69 80 5 NN
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| 5 O
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| i.
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| LER #:
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| 50-321/1981-052 Licensee:
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| Georgia Power Company Facility Name:
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| Edwin I. Hatch j
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| Docket #:
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| 50-321
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| =Narrative=
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| Report for LER 50-321/1981-052 The
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| 'B' LPCI inverter R44-S003 tripped on overtemperature on four (4) separate occasions.
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| These trips occurred on 6-10-81 at 0317 CDT, 6-18-81 at 0010 CDT, 6-18-81 at 1217 CDT, and 6-21-81 at 1850 CDT and were reported on deviation report numbers 1-81-119, 1-81-128, 1-81-130, and 1-81-134, respec-tively.
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| The cause of these trips was attributed to defective temperature switch (es) in the inverter leg (s).
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| All the i
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| temperature switches will be changed out to prevent recur-rence of this problem.
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| Following each trip the inverter was reset and returned to service.
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| The loss of this inverter resulting from an overtemperature trip was reported on LERs j
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| 50-321/1980-082, 092, 102, but was attributed to lack of cool-ing water to the inverter room air conditioner causing a high temperature in the inverter room.
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| The trip in this report. was attributed to defective temperature switches which is not a repetitive occurrence for this inverter.
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| I The
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| 'B' LPCI inverter 2R44-S003 tripped on two (2). occasions
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| ~
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| while separately backseating recirc suction and discharge 1
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| valves 2B31-F023B and
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| : F031B, respectively.
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| These trips occurred on 6-16-81 at 1315 CDT for 2B31-F023B and on 6-16-81 at 1422 CDT f or - 2B31-F031B and were reported on deviation report numbers 2-81-102 and 2-81-104.
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| The cause for these l
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| trips could not be determined since the alarms on the inverter I
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| were reset and not recorded.
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| A standing order was written.
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| l requiring operations personn.el to record all alarms prior to returning the inverter (s) to service.
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| This will give suffic-ient information in the future to determine the cause of an i
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| inverter trip.
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| When Unit 2 has an outage of sufficient dura-tion the above valves will be backseated at separate times in an attempt.to simulate the condition that caused this inverter to trip.
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| The loss of the inverter in the preceding manner is a nonrepetitive occurrence.
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| l An update report will be issued following the replacement of the temperature switches on R44-S003 and completion of the investigation into the tripping of 2R44-S003.
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| l l
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| l f
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| }}
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| {{LER-Nav}}
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