05000318/LER-1980-015-03, /03L-0:on 800227,during Maint,Control Element Assembly 44 Dropped Into Core.Caused by Electrician Accidentally Grounding Prime 15 Volt Power Supply.Faulty Backup Power Supply Was Changed

/03L-0:on 800227,during Maint,Control Element Assembly 44 Dropped Into Core.Caused by Electrician Accidentally Grounding Prime 15 Volt Power Supply.Faulty Backup Power Supply Was Changed

ML19309A829
Person / Time
Site:	Calvert Cliffs
Issue date:	03/25/1980
From:	Bauer E, Lagiewski J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309A819	List: 05000318/LER-1980-015, Forwards LER 80-015/03L-0 05000318/LER-1980-015-03, /03L-0:on 800227,during Maint,Control Element Assembly 44 Dropped Into Core.Caused by Electrician Accidentally Grounding Prime 15 Volt Power Supply.Faulty Backup Power Supply Was Changed
References
LER-80-015-03L, LER-80-15-3L, NUDOCS 8004010388
Download: ML19309A829 (2)

LER-1980-015, /03L-0:on 800227,during Maint,Control Element Assembly 44 Dropped Into Core.Caused by Electrician Accidentally Grounding Prime 15 Volt Power Supply.Faulty Backup Power Supply Was Changed

Event date:
Report date:
3181980015R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

lOTi1 h lo Ic Ic h 12 l@l o i n i _ l n i n i n I nj n I _ i n i n l@l 41, li I, I, l@l I

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 26 26 LICENSE TYPE JO 57 CA1 68 CON'T I o I 1 lh 3 U l L l@l -l 5 l 010 l 0 l 3 l 1 l 8 l@l o I 7 l ? I 7 l R l n l@l n 1 t l 9 l c; I o I n l@

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74

?S REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o I a i IDurino maintenance, at 1303. control element assor,hly (CFA) da drnnned intn the Io i3l l core. Per T.S. 3.1.3.1.f reactor power was reduced to,< 70% by 1345 CFA da l

I o 14j % withdrawn back to its aroup at 1422.

All other CEA's remained nnprahin.

I l o i s i IFo110 wing the dropped CEA at 1615. azimuthal cower tilt (Toi was fnnnd tn ha l

IoIsI >.030.

Per T.S. 3.2.4. total clanar radial ceakino factnr and tntal intanratad I

lO l 7 l Iradial peakino factor were verified to be within ifmits.

To was reduced tn <.030 I

i o i s i lat 1905.

LER's 80-12 (U-1) & 80-10 (U-2) describe similar events.

I E

CODE SUSCO E COMPONENT CODE SUSCODE SU E

lo191 1 R l B l@ W@ LC_J @ l I l til S l Tl R l U l@ l p l@ [Z_j @

7 8

9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE RiR EVENT YEAR REPORT NO.

CODE TYPE NO.

@ yug"O l 8101 l-l 1 01 11 51 LdJ lof3i LLJ I-I LaJ aE

_ 21 22 23 24 26 27 28 29 00 31 32 KN AC ON ONP NT M

HOURS 22 38 IT POR 8.

S PPLIE MANUFACTURER lCl@[li_J@

l Bl@

[Z_J@

l0101Ol81 l Yl@

l Y l@

l fil@

l Pl 311141@

i 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS t li 101 [t was found that the back-uo 15V onwar sunnly fnr CrA ad had dnuninnad 2 1 m, I

I ii iti voltace outout on its teminals.

Durina the course nf changinn not +bo h=%p it #2i power supply, the prime 15V oower supoly was accident 1v orounded by the electrician I

i1 #3i pausino CEA 44 to drop. The faulty back-uo power sucolv was chanoe_d out and CEA 44 i

,i i4i pas raised without further mishap.

I 7

8 9 80 STA

% POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION 11 15IlEl@ l0191Ol@l ilA l

l A l@l Operator Observation l

ACTIVITY CO TENT RFLEASF AMOUNT OF ACTIVITY LOCATION OF RELEASE ft I 6 I [.Z_] @D OF PELEASELZj@l NA I

I NA I

PERSONNEt ExPOSOES NUMBER TYPE

DESCRIPTION

15171 b b l o l@LZ_J@l NA

~ -

- l

' PERSONNEt,N;UViES NUMBER

DESCRIPTION

i 11 la l l_010 l o l@l NA l

7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

D 8 00401r-9 l

li 191 U@l na 7

8 9 10 80 l

flA l

[tlllll1Iill lj l a l o l I t4 U@ DESCRIPTION ISSUE l

7 8 9 10 68 69 80 3 J. S. I.aaiewski/E. R. Bauer l3011760 a747f4728 NAME OF PREPARER PsONE:

o l

LER NO.

80-15/3L DOCKET NO.

50-318 EVENT DATE 02/27/80 REPORT DATE 03/25/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

(CONTINUED)

The technician was verbally cautioned to use extra cr.ve and caution when dealing with these power supplies.

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