05000317/LER-1980-016-03, /03L-0:on 800325,during Surveillance Testing, Channel a Wide Range Nuclear Instrument Did Not Respond in Calibr Mode.Apparently Caused by Failure of Channel Preamplifier.Power Supply Replaced W/Spare

/03L-0:on 800325,during Surveillance Testing, Channel a Wide Range Nuclear Instrument Did Not Respond in Calibr Mode.Apparently Caused by Failure of Channel Preamplifier.Power Supply Replaced W/Spare

ML19309F384
Person / Time
Site:	Calvert Cliffs
Issue date:	04/25/1980
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309F382	List: 05000317/LER-1980-016, Forwards LER 80-016/03L-O 05000317/LER-1980-016-03, /03L-0:on 800325,during Surveillance Testing, Channel a Wide Range Nuclear Instrument Did Not Respond in Calibr Mode.Apparently Caused by Failure of Channel Preamplifier.Power Supply Replaced W/Spare
References
LER-80-016-03L-01, LER-80-16-3L-1, NUDOCS 8004290388
Download: ML19309F384 (2)

LER-1980-016, /03L-0:on 800325,during Surveillance Testing, Channel a Wide Range Nuclear Instrument Did Not Respond in Calibr Mode.Apparently Caused by Failure of Channel Preamplifier.Power Supply Replaced W/Spare

Event date:
Report date:
3171980016R03 - NRC Website

text

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80042d'09 LICENSEE EVENT REPORT CONTROL BLOCK: I I

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l l lh (PLEASE PAINT OR TYPE ALL REQUIRED INFORMATION) lo l1I l Mi Dl Cl Cl Nl 1l@l 0101 -l 0101 Ol 0101 -l 01 Ol@l 4l il il 11 ll@l I

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7 8 9 LICENSEE CODE 14 15 LICENSE NWSER 25 26 LICENSE TYPE 40 57 CAT 58 CON'T lolti US l Ll@l 0] 51 01 01 01 31 11 7 l@l0 13 12 15 18 10 l@l 01 41 ? ! G l A CE 7

8 60 61 DOCKET NUve ER 68 69 EVENT D ATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h 10121 l At 1030. durina the cerformanco of survaillanca testinn; channn1 A wtaa l

Io ia i I range nuclear instrument (WRNI) did not resoond in the calibrate m^de.

The i

10: 4i l instrument was placed out of service in accordance with T.S. 3.3.1.1.

The I

three redundant channels remained operable during this event. Channel A I

iO isi i F6 isl I WRNI was returned to service at 1525. This has not been a recetitive event.

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10 11 12 13 18 18 20 SECUE NTI AL OCCURRENCE REPORT REVISION LE R / RO EVENT YEAR REPORT NO.

CODE TYPE NO.

O, reg 1810l l-l 1011l6l l/l 10 13 I Il l l-l [Q_j 21 22 23 24 26 27 28 29 30 31 32 T

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i i o I l Channel A wide rance nuclear instromont 1; vnc nnwor ennnly one rnnna +., %ye I

li t i l I failed to a level of -20.86 VDC. The dual + 15 VDC suonly (Ganoral Atn,ic en I

ii i u l Model GA-008) was replaced with a scare.

Failura of the nnwar sonnly annarantly I

l caused failure of the channel's creamolifier (General Atomic Co. Model PA-61 I

at : 3 which was also found to be inoperative.

I i,i,i i 80 7

8 9 ST

% POWER OTHER STATUS SCOV RY DISCOVERY DESCRIPTION li i s l l Cl@ l 0 l 0 l 0 l@l NA l

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A!TivirY COATENT RELFASED OF RELE ASE AVOUNT CF ACTIVITY LOCATION OF RELEASE li j s l l_7J @ l Z l@l NA l

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PERSONN L EXPOS ES oESCRiPTiON @

NUMBER TvPE l i II) 1 01 01 0 @l_Z_J@l NA

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' PERSONsEL iN;udits NUMBER

DESCRIPTION

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• li ta l l 0101 Ol@l NA 80 7

8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

11 l91 l Zl@l NA l

80 7

8 9 10 g

ISSUED OESCRIPTION LWh NA I

l I l I I I I I I I I I I *:

68 69 80 5 7

8 9 10 d. S. laQiewski/P. G. Rizzo PsONg:(101 M Ao a7a7 /a7pg E

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NAME OF PREPARER i

LER NO.

80-16/3L DOCKET NO.

50-317 EVENT DATE 03/25/80 REPORT DATE 04/25/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE dCTI'ONS: (CONTINUED)

The preamplifier was also replaced.

Failure of these power supplies is expected to occur periodically due to component aging. To date, a high rate of failure has not been attained.

Therefore, no preventive action is deemed necessary at this time.

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