ML20204D418

LER#78-035/01T-0 on 781124:while Checking RR MG Set 1B Speed control,1 Amp fuse(F2) in Drive Amplifier Circuit Was Pulled Out & Checked.Caused Rapid Increase in Pwr Level,Tripping RR MG Set 1B

ML20204D418
Person / Time
Site:	Cooper
Issue date:	12/08/1978
From:	Bedner L NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20204D415	List: ML20204D412 ML20204D418
References
LER-78-035-01T, LER-78-35-1T, NUDOCS 7812200274
Download: ML20204D418 (1)

Text

_ _ _ _ _ _

NRC FORM 366 U. S. NUCLEA R REGULATORY COMMISSION (7 77)

. . LICENSEE EVENT REPORT

[] CONTROL BLOCK: l l l  ! l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI I O 8l 91 l lN lE lC lP lR l1 l@l0 b l-l0l0l0l0l-l0l0l0l@l4l1l1l1l1l@l 7 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO l

bl L A T b6 l@

CON'T lolil 7 8 S$RN60lb hl 0 l 5 l 0DOCK 61 l 0ET NUMBE l 0 l R2 l 9 l 688 l@l 69 111 EVENTl DATg 214 l 7 l 8 l@ll 14 75 l REPORT 210 DIATE8 l 7 l808 l@

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IoI2i Phile troubleshooting the RR MG Set 1B speed control the 1 amp fuse (F2) in the drive 1

[p l3 l l amplifier circuit was pulled out and checked. This resulted in moving the scoop tube l lo l4 l pn and caused an increase in speed of the RR MG Set 1B. Subsequently there was a j joisj [ rapid increase in power level. The RR MG Set 1B was tripped. No other significant l lo l6 l l0CCurrence took place. This event had no effect upon public health or safety. l l0l7, l l l

10181 l 80 7 H 9 C E CODE St BCO E COMPONENT CODE SUBCOD'E SU E lo191 7 8 l Rl Bl@ l Alh l C lh l Zl Zl Zl Zl Zl Zlh l Zl@ l Zl@

9 to 11 12 13 18 19 20 SE QUENTI AL OCCURRENCE REPORT R EVISION LER EVENT YE AR REPORT NO. CODE TYPE NO.

b ajg'RO y l 7l8l l-l l0 l3 l5 l l/l l 0l 1l lT l l-l l0 [

21 22 23 24 26 27 28 29 30 31 32 TAKEN ACTO ON PLANT M HOURS 22 SB IT FOR b B. SUPPLt MANUFACTURER l33X lgl34Zl@ lZlg W @ l0 l0 l0 l0 l lN l@

41 l lg l43Z l@ l44Z l 9 l 9 l 947l@

JS 36 31 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lijollThr. increase in speed of the RR MG Set 1E which resulted in a sudden power level l L1 11 l l change when the fuse F2 was pulled out agrees with the design concept as described I i i i i ;, i lin vendor supplementary instructions. A tag was attached to the RR MG Set 1B scoop l l,l3l l tube drive not to pull out the lower fuse (F21 vaen the RR MG Set is running. An j l

[i14l l engineering evaluation of the control system will be performed. l 7 8 9 80 ST A U  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION NA l lCl@l Routine Maintenance l li l s l lE l@ l 0 l 2 l 7 l@l ACTIVITY CO TENT RE LE ASE D OF RE LEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I1 16 l l Zj @ l Z l@l N/A l l N/A l 7 8 9 10 t1 44 45 60 PERSONNE L E XPOSURE$

NUMBE R TYPE D E SC RIPTION 11 l 71 l 0l 0l 0l@]@l 3 l PERSONNE L INJU IE3 NuvesR or=rRiptiON@

l l1 la8 l9 l Ol 0l 0lhi 7 11 12 NA 80 j LOSS OF OR DAMAGE TO F ACILITY  !

TYPE DESCRIPTION l

li l 91 7 H "

I Zi@l 10 NA 80 i PUBLICITY NRC USE ONLY l i, i e i iggi "c"g" y/81220 s74 i , i i , ,iiiii ,,ii  :

7 8 9 10 68 69 80 5 Ladislav F. Bednar 402-825-3811 NAME OF PREPARER _ PHONE: {

.#