05000318/LER-1980-050-03, /03L-0:on 801027,wide Range ex-core Nuclear Instrument Channel B Failed.Caused by Greater than or Equal to 15-volt Dc Power Supply Having Low Supply W/Ac Ripple. Power Supply Replaced

/03L-0:on 801027,wide Range ex-core Nuclear Instrument Channel B Failed.Caused by Greater than or Equal to 15-volt Dc Power Supply Having Low Supply W/Ac Ripple. Power Supply Replaced

ML19345B839
Person / Time
Site:	Calvert Cliffs
Issue date:	11/26/1980
From:	Ligiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B832	List: 05000318/LER-1980-050, Forwards LER 80-050/03L-0 05000318/LER-1980-050-03, /03L-0:on 801027,wide Range ex-core Nuclear Instrument Channel B Failed.Caused by Greater than or Equal to 15-volt Dc Power Supply Having Low Supply W/Ac Ripple. Power Supply Replaced
References
LER-80-050-03L-01, LER-80-50-3L-1, NUDOCS 8012020600
Download: ML19345B839 (1)

LER-1980-050, /03L-0:on 801027,wide Range ex-core Nuclear Instrument Channel B Failed.Caused by Greater than or Equal to 15-volt Dc Power Supply Having Low Supply W/Ac Ripple. Power Supply Replaced

Event date:
Report date:
3181980050R03 - NRC Website

text

NRC FOLMh64 ~

l[S. NUCLEA3 KEGULAToRY COMMISSION -

17 77) e, LICENSEE EVENT REPORT CONTROL BLOCK: l

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l' I I'

-(PLEASE PRINT CQ TYPE ALL REQUIEED INPO".MATION)

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49 LICENSEE CODE 14 15 LICENSE NuM8ER 25 26.

LICENSE TYPE JO 57 CAT 64

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",% l L l@l 0 15 10 10 10 13 11 18 l@ll 10 12 17 18 10 l@l1 11 12 16 IR in l@

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60 63 QQCKETNUMSER 68 62 EVENT QATE 74

- 75 REPORT DATE 80 EVENT DESCRIPTloN AND PROS A8LE CONSEQUENCES h 4

TTTT1 l At 2025, during nomal operation, Wide Ranae Ex-Core Nuclear Instrument l

ITTTl I (WRNI) Channel 8 failed. The channel was declared inoperable and start,

i r3 r71 l up-rate Channel B was bypassed per T.S. 3.3.1.1.

Channel B WRNI 'a:.

l r3 prj i start-uo rate trip were returned'to service at 2325; Channels A, C, and l

iO is i l 0 remained ' operable durino the event. LER 80-16 (U-1) describes a simi-1 iOi7i i lar occurrence.

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CODE SUSC E COMPONENT CODE SL8 CODE SU E

10191 I I I C l@ (g_l@ LF_j @ I I I N l S l T l R I U l@. IP lh y @

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9 to si 12 13 is 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION ggRrRo EVENTYEAR REPORT NO.

CODE TYPE NO.

@,ag 18101 l-l 1015101.

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33 34 35 36 37 40 el 42 43 44 47 CAUSE oESCRIPTION AND CORRECTIVE ACTIONS h I t 10 l l The WRNI I15 VOC power suoolv voltace was found to have low 115 VDC I

mI output with AC ricole. The power suco1v (Powemate Model DRA 15.750/

I

, 2 1

15.750) was reolaced with a stock soare. The failure is considered to I

i,i3i l be a natural end of life type of failure. No preventive action is I

4 i

I deemed necessary at this time.

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- 7 REtEasE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 1116 l [Zj @o 0F RELEASE [Z_j@l NA l

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7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER -

TYPE

DESCRIPTION

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