05000325/LER-1979-110-03, /03L-0:on 791218,while Performing Reactor Vessel Shroud Calibr,Switch 1 on 1-B21-LITS-N037 Was Found Out of Calibr.Caused by Bump from Nearby Scaffolding or by Calibr of Brooks Converter.Switch Was Recalibr

/03L-0:on 791218,while Performing Reactor Vessel Shroud Calibr,Switch 1 on 1-B21-LITS-N037 Was Found Out of Calibr.Caused by Bump from Nearby Scaffolding or by Calibr of Brooks Converter.Switch Was Recalibr

ML19262C013
Person / Time
Site:	Brunswick
Issue date:	01/15/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19262C012	List: 05000325/LER-1979-110, Forwards LER 79-110/03L-0 05000325/LER-1979-110-03, /03L-0:on 791218,while Performing Reactor Vessel Shroud Calibr,Switch 1 on 1-B21-LITS-N037 Was Found Out of Calibr.Caused by Bump from Nearby Scaffolding or by Calibr of Brooks Converter.Switch Was Recalibr
References
LER-79-110-03L, LER-79-110-3L, NUDOCS 8001220437
Download: ML19262C013 (2)

LER-1979-110, /03L-0:on 791218,while Performing Reactor Vessel Shroud Calibr,Switch 1 on 1-B21-LITS-N037 Was Found Out of Calibr.Caused by Bump from Nearby Scaffolding or by Calibr of Brooks Converter.Switch Was Recalibr

Event date:
Report date:
3251979110R03 - NRC Website

text

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1.lCENSEE EVENT REPORT

' 6ONTROL BLOCK:

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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7 8 9 LICENSEE CoOE 14 15 LICENSE NUMSER 25 26 LICENSE TYPE JO b7 CATsd CON'T E

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8 60 El DOCKET NUMBER 6d 63 EVENT DATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h o

2 l k*hi7 e performinst PT 3.1.5PC. Reactor Vessel Shroud Level Channel Calibration. switch I l o 131 1 # 1 on 1-B21-LITS-NO37 was found to be out of calibration.

The switch was actuating I is 259 + 5.7" H 0 and the reportable limit is 1 at 288" H,0, whereas the setpoint 3

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I I _> 262.94" H,0 (> 39 inches below top of active fuel).

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a l Technical Soecification 3.3.3. 6.9.1.9a l

SYSTEM

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9 to 11 12 13 18 19 20 SEOUENTI AL CCCL @ E NCE REPORT REVISiCN gg go EVENT YEAR

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40, 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i 10 l It is believed that the instrument may have been bumped by scaffolding located near thq lilii linstrument or that the switch operation could have been affected bv the calibration off lthe Brooks converter, which had iust been calibrated. The switch was recalibrated andf 2

i returned to service. Maintenance Instruction 3-lP will be revised to require the I

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calibration of the switches whenever the Brooks converter is calibrated.

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.PCWER oTHER STATUS ISC O RY DISCOVERY DESCRIPTION NA l

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ACTIVITY CO TENT RE u ASEo 0,RE u ASE NA I

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8 9 10 f1 44 45 80 PERSONNEL EXPOSURES NOY8E R TYPE DESCRiPT1gN l

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,ERSONNE L iN;UR'IES oESCR,TiO~@

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NAME OF PREPARER A.

C.

Tollison. Jr.

PHONE:

419-457 0521 g

LER CONTINUATION - RO # 1-79-110 Facility: Unit No. 1 Date:

12-18-79 These switches are to be replaced during the 1980 refueling outages with new analog instrumentation.

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