05000282/LER-1980-009-03, /03L-0:on 800310,during Normal Operation,Nuclear Power Range Channel 1N44 Was Inoperable for Several Minutes. Caused by latch-up of High Voltage Power Supply Due to Spike on Yellow Instrument Bus.Fuses Were Removed & Reset

/03L-0:on 800310,during Normal Operation,Nuclear Power Range Channel 1N44 Was Inoperable for Several Minutes. Caused by latch-up of High Voltage Power Supply Due to Spike on Yellow Instrument Bus.Fuses Were Removed & Reset

ML19305D343
Person / Time
Site:	Prairie Island
Issue date:	04/09/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19305D341	List: 05000282/LER-1980-009, Forwards LER 80-009/03L-0 05000282/LER-1980-009-03, /03L-0:on 800310,during Normal Operation,Nuclear Power Range Channel 1N44 Was Inoperable for Several Minutes. Caused by latch-up of High Voltage Power Supply Due to Spike on Yellow Instrument Bus.Fuses Were Removed & Reset
References
LER-80-009-03L, LER-80-9-3L, NUDOCS 8004140440
Download: ML19305D343 (1)

LER-1980-009, /03L-0:on 800310,during Normal Operation,Nuclear Power Range Channel 1N44 Was Inoperable for Several Minutes. Caused by latch-up of High Voltage Power Supply Due to Spike on Yellow Instrument Bus.Fuses Were Removed & Reset

Event date:
Report date:
2821980009R03 - NRC Website

text

,,,,,...

(7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

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

FOTil l M ! N l P l I l N l 1 l@150 l0 l-l 0 l0 l0 l0 l 0l -l0 l0 l@ 4 l1 l1 l1 l1 l@l l

l@

7 8 9 LICENSEE CODE 14 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T S URN ! L hl 0 l 5 l0 l 0 l0 l 2 l 8 l 2 @l 013 l1 l 01810 @l 0 l 4 l 0, 9l 8 l 0 l@

7 8

60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h ITlTI l During normal operation. Nuclear Power Range Channel 1N44 was inoperable for a few l

l0l3l l minutes. Immediately after loss of the channel, its bistables were put in trip. No l O 4 l effect on public health and safety. Redundant channels were operable. Tech Spec l

O s l3.5 applies.

l 0 6 l l

10171 l l

LO_L8J l I

7 8 9 80 E

CODE SU8C E COMPONENT CODE SUBCODE 5

DE l Il Al@ W@ W@ l Il Nl Sl Tl Rl Ul@ W@ W @

O 9 7

8 9

to 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION L

EVENT YE AR REPORT NO.

CODE TYPE N O.

@,a'ER/RO18 l0 I

[_j l 0l 0] 9l l/l l0 l3 l W

W

]

uM%

_ 21 22 23 24 26 27 28 29 30 31 32 K N AC O PL NT ME HOURS 22 SB IT FOR B.

SUPPLI R MANUFACTURER ULl@lZ l@

LZ_J@

LB@

l 1

I Io I L"l@

LN j g [N j g lW j1 l2 l0 l g 33 34 _

3S 36 37 40 el 42_

44 47 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h W l The high voltage power supply for the detector " latched up" due to a spike on the l

i i l Yellow Instrument Bus.

This is characteristic of these power supplies. Removal and I

, 2 l reinsertion of the power supply fuses allowed the circuitry to reset.

I i 3 l l

mI l

7 8 9 80 ST S

% POWER OTHER STATUS DfS O RY DISCOVERY DESCR!PTION Ii 15 I (_E_j@ l1 l 0 l 0 l@l N/A l

(_A_j@l Control Room Annunciator l

A TIVITY CO TENT RELE ASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

@ [Z_j@l NA l

l NA l

i 6 7

8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

l0 l 0 l 0 l@l Z l@l NA l

1 7

,ERSO~~El'iN;U!,ES oESCRi,TiO~@

~ UMBER lCl0l0l@l NA l

i a 7

8 9 11 12 80 LOSS OF oR DAMAGE TO FAC4LITY Q i

TYPE DESCR6PTION V,

l

@l NA I 9 l

7 8 9 10 80 ISSUjE @l DESCRIPTION lN NA l

llllllllllll l2 2 O 7

8 9 10 68 69 80 5 nstad 612-388-4767 2

NAME OF PREPARER PHONE:

8004140 %