05000324/LER-1982-138-03, /03L-0:on 821207,during Plant Operation,Rbma Inoperable Annunciator Received When Any of 15 Listed Control Rods Selected.Caused by Failed Q10 Transistor on First Level Multiplexer Card.Card Replaced

/03L-0:on 821207,during Plant Operation,Rbma Inoperable Annunciator Received When Any of 15 Listed Control Rods Selected.Caused by Failed Q10 Transistor on First Level Multiplexer Card.Card Replaced

ML20028D182
Person / Time
Site:	Brunswick
Issue date:	01/05/1983
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028D180	List: 05000324/LER-1982-138, Forwards LER 82-138/03L-0 05000324/LER-1982-138-03, /03L-0:on 821207,during Plant Operation,Rbma Inoperable Annunciator Received When Any of 15 Listed Control Rods Selected.Caused by Failed Q10 Transistor on First Level Multiplexer Card.Card Replaced
References
LER-82-138-03L-01, LER-82-138-3L-1, NUDOCS 8301170210
Download: ML20028D182 (1)

LER-1982-138, /03L-0:on 821207,during Plant Operation,Rbma Inoperable Annunciator Received When Any of 15 Listed Control Rods Selected.Caused by Failed Q10 Transistor on First Level Multiplexer Card.Card Replaced

Event date:
Report date:
3241982138R03 - NRC Website

text

(1 178 LICENSEE EVENT REPORT

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LICENSE NUMUER 25 26 LICENSE TYPE Jo 57 CAT $8 COWT J,"J [_LJ@l ol s I n I _ l n I, I, I,. l@l i I 2 I o I 7 I a 12 l@l011 l0 15 18 I 3 l@

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8 60 61 DOCKET NUVBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121l Durine plant operation. an "RBMA Inonerable" anrunciator was received when any of l

4 lo l3 l l the following control rods was selected:

14-19, 14-15, 18-19, 18-15, 22-19, 22-15, I

In accordance l

1 26-19, 26-15, 26-27, 26-23, 22-27, 22-23, 18-23, 14-27, and 14-23.

o 4 lo isl l with technical specifications,RBMA was then declared inoperable. At the time of this l 1 o 16 l l cvent, RBMB was operable. This event did not affect the health and safety of tne l

l l0 l7l l public l0 Is l I Technical Specifications 3.1.4.1.

6. 9.1 '. 9h 80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SU8 CODE SUSCODE

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18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION L E R/RO EVENT YE AR REPORT NO.

CODE TYPE NO.

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33 J4 3's 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l1 l o l l A f ailed transistor. Q10, on the second first Icvel multiplexer card of RBMA caused l

li li j l the event. The subject multiplexer card, Model No. 136B3221P001RB, was replaced and l

,,,,, l RBMA was returned to service, it is felt,the presently utilized biannual channel l

calibration of the RBM system is adequate to ensure the operability of the system; l

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therefore, no further action regarding this event is required.

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8 9 ST

% POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION

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i s A T!VITY CO TENT AVOUNT OF ACTIVtTY LOCATION OF RELEASE RELE ASED@OF RE LE ASEl zi@l N^

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E 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

Ld 01 ol@l1]@ln I

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' PER5o~NE L,Nau'AES oESCniPTiOs@

NuuSER I d 01 ol@l NA I

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.I oSS Or oR oSacE TO FACILITY n 8301170210 830105 TYPE oESCRiaTioN U

PDR ADOCK 05000324 d3 s

PDR l

U @l NA i 9 30 7

8 9 to ISSUdE @DE CRtPTION l__

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llllll[Illlll; 2 o 68 69 80 5 7

8 9 10 (9ICI 057 052I NAME OF PREPARER M. J. Pastva. Jr.

PHONE:

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