ML19318C065

Updated LER 80-009/03L-1:on 800310,during Normal Operation, Nuclear Power Range Channel 1N44 Was Inoperable for Few Minutes.High Voltage Supply for Detector Latched Up Due to Spike on Yellow Instrument Bus

ML19318C065
Person / Time
Site:	Prairie Island
Issue date:	06/27/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19318C062	List: ML19318C061 ML19318C065
References
LER-80-009-03L, LER-80-9-3L, NUDOCS 8006300499
Download: ML19318C065 (1)

Text

(7-77)

LICENSEE EVENT REPORT Update R: port

(' Previous Report Date 040980 CONTROL BLOC 4: l 1

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! N l LICENSEE P l I lCODE N l1 l@l 14 015 l 0 l - l 0 l 0 l 0 l 0 l 0l -l 0 l 0 l@l LICENSE NUM8ER 26 4 l1 LICENSE 26 l 1 l 1TYPE l 1JOl@l57 CAT l 68 l@

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74 75 RE PORT DATE 80 7 8 60 61 NUMBER 68 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Lo_J 2_j During normal operation, Nuclear Power Range Channel IN44 was inoperable for -l o 3 l a few minutes. Immediately after loss of the chnnnel. f ra hinenblon unra nur l 0 4 ! in trip. No effect on nublic health and safety. Ro dun dnn e chnnnala unra I E l operable. Tech Spec 3.5 applies. 1 0 6 l 1 0 7 l l FO F l l DE CODE $ BC E COMPONENT CODE SU8 ODE SU DE O 9 lIlA l h [D_jh ( Z_j h l Z l Z l Z l Z l Z l Z lh [Z_lh (g_j h 20 7 8 9 10 11 12 13 18 19 SEQUENTIAL OCCURRENCE REPORT REVISION tg gjpg ,,,, EVENT YEAR REPORT NO. CODE TYPE N O.

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(--J 31 M32 K N AC O ON PL NT E HOURS S8 IT POR 8. SUPPL MANUF ACTURE R Lx_J@LZ_J@ LZ_1@ lzJ@ 101010101 L2Ll@ (R_l@ l.2_]@ I44Z 19191947l@

33 34 JS 36 37 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l The high vc tage power supply for the detector " latched uo" due to a snike on cha 1

l i i l Yellow Instrument Bus caused by an instrument technician workine on n norrinn nf I g l the Radiation Monitoring System pevered by the same bus. This is characteristic of I

, 3 l these power supplies. Removal and reinsertion of the power supply fuses allowed the l i 4 l circuitry to reset. The procedure for performing maintenance on a Radiation l 7 8 9 Monitoring channel has been chan . 80 SYA S  % POWER OTHER STATUS Dis O RY DISCOVERY DESCRIPTION i 5 l,,y,,,j h l1{0 l0 lh! N/A l (,A,,jh! Control Room Annuncintor l ACTIVITY CO TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q y @D OF RELEASE [Zj@l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION D l i 7 l 0 l 0 l 0 l@[Z j@l _

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l LOSS TYPE OF OR DAMAGE TO FACILITY Q DESCRIPTION  %,r I Q y@l NA 80 l

7 8 9 to PU8LICITY NRC USE ONLY 2 o l l lllllllllllll4 7 8 9 10 68 69 80 .

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