ML20039C525

LER 81-114/03L-0:on 811121,B Loop of Rhr,Lpci Injection Valve 2E11-F015B,motor Breaker Tripped & Could Not Be Reset. Caused by Motor Windings Drawing Excessive Current Causing Windings to Deteriorate.Motor Replaced

ML20039C525
Person / Time
Site:	Hatch
Issue date:	12/17/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039C516	List: ML20039C515 ML20039C525
References
LER-81-114-03L, LER-81-114-3L, NUDOCS 8112290434
Download: ML20039C525 (2)

Text

- _ ____ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

U 77)

• LICENSEE EVENT REPORT CONTROL BLOCC l i

l l l I I lh e

(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION1 lo lil l G I A I E I I I H I 214l@l250 !0 ! 1010 l010 l0 l- l010 25 l@l 26 11 11 LICENSE Il TT ll PE ll@l 40 l

57 bat 56 l@

ucENSE % VSER d 9 L+CENSEE CODE C oN'T 1011]3 sc[S"y l L }@l 0 l 5 l 01010131616 68

}@l1 63 11 12 11 1811'5 l@lR' 11211 Ek ENT D ATE '4 c FORT O ATE 1718 80 l1 l@

' 60 6' OOCAET % vgEm EVENT csscRIPTioN AND PROS ABLE CONSEQUENCES h "R" f_ con i 10 10! ! On November 21. 1981. with the unit 11 reactor at full cower. the I

of RHR, LPCI Injection Valve, 2E11-F015B, motor breaker tricoed and could total l I

not be reset. The "C" Loop of RHR was declared inoo and Tech Soec Section lo t Al l 3.5.3.2 was implemented. Redundant systems were operable. There were 1 lo is t 1 This is a i 10 !s l 1 no effects upon public health and safety due to this event.

I jo 4 -ii non-repetitive event.

l 63 9 }!

cAuSE CALSE

ovo ,ALyE 5 R 1-1 111114l I/l 10l3I IL l l-l l0l e) .T.U; L;I 8111=

~ -

n :4 .6  :. s 2, -

PQiVE COYP.

n -

COY'ONENT ATTACwVENT NPnD-4 ACT ' ON EUTUAE E88EOT 5- u T OO.iN *Oya5 22 SUS Yt TT E O 80att WB SU PD L:EA Ya%eACTUPER ACTI ON CN #LANT VETwOO T a v. E *.

lZ j@ ] 01 01 01 l l Yl@ l N Jg l N j@ lLl2l0l0lg l A lgl3*Z]@

a.

l Z!@

4 ao a 40 42 42 43 44 47 CAUSE CESCRIPTloN AND CORRECTIVE ACTloNS Q7)

The motor breaker for "B" 1000 of RHR Injection Valve tripoed because 1

}inoil li!1 ji the motor windinas drew excessive current causina them to deteriorate.

,. ,,j }

The motor was replace d and the injection valve proven operable and the t i ,

93; l "B" loop of RHR was returned to an operable status. ]

I 12 4 1i ao ,

6 3 E THCO OE K ACILITY y rt OvEnv oescOvens :EE:mPTicN a..

sTArus .

• C v. E n OT-ER sTATws .

l A j@l Operation observation l I1 !El [E j @ [0 19 !9 l@ l NA 4

l 4r, g3

' B 9 19 12 n 4:

ACT;VIT Y CON T E'.T L^C AT:CN OF HEL EA35 au GELEASEO C5AELEASE AYOUNT CF ACTit:T* W j l NA l l1 i 6 l l Z l @ [Z_j@l NA 4 '

m oN.'E <.,0 0 Es mea Tvn OEst asT.eN @ l NA lt ! 'l l 0 l 010 '@l Z {@ln ,;

, 4 3 P E f C'. '.E L t ..V ' E 3 y / 9En OEs a sti O '. '+ a NA l it ij(010l0l@l 80 8 ft 12 e;{# g .;gC.E},7 m tc @

NA l l>ltllZ!@l 8112290434 811 3

tmc usE : u u [C.ESCur.o , @

hDRADOCK0500 6 PDR.A l }l IIiiltiIf! [;

12 l ol l N !gl u .y 33 ,

! d 2 R. T. Nix, Suot. of "aint. _ P"cN E:

912-357-7781  ?

e wee cr onEoAnEg

e LER "o.: 50-366/1981-114 Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No.: 50-366 Narrative Report for LER 50-366/1981-114 On November 21, 1981, with the Unit II reactor operating at full power (995), the "B" loop RHR Injection Valve, 2E11-F015B, motor breaker tripped and would not reset. An investigation revealed valve, 2E11-F015B, motor was damaged. The "B" Loop of RHR was declared inoperable and Tech Specs Section 3.5.3.2 was implenented. Redundant systems ("A" Loop of RHR, Core Spray, HPIC, PCIC and ADS) were available and operable. There were no effects upon public health and safety due to this event. This is a non-repetitive event.

The motor breaker for the "B" Loop RHR Injection Valve tripped because of motor windings drew excessive current causing severe damage to the motor windings. The cause was attributed to unbalanced supply voltage and excessive torque requirements due to reactor pressure against the valve.

A LPCI inverter card was replaced to balance the voltage. The motor was replaced and the injection valve, 2E11-F015B. was then tested for operability and returned to service. Public health and safety was not affected by this event.

No inherent problems was found in the generic review.

._