ML20084U049

LER BFRO-50-296/7617:on 761030,recirculation Pump 3B Tripped.Caused by Burned Collector Ring on Motor Generator Set Exciter Due to Worn Carbon Brush.Ring Repaired & Brushes Replaced

ML20084U049
Person / Time
Site:	Browns Ferry
Issue date:	11/23/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-296-761, NUDOCS 8306270031
Download: ML20084U049 (2)

Text

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b LICENSEE EVENT REPO ..

CONTAOL DLOCK:l* f *l l l l l (PLEA 5E PRINT ALL REQUIRED INFORMATION) 1 6 ht isCENSE NUMOL A Y ( fy

@I) l A l L ! B l R l Fl 3l l 0l 0l-l0 l 0 l 0 l 0 l 0l-l 0l 0l l4 l1 l1l1l1l 30 l 0l 3l 32

/e9 14 15 25 26 31 CAltiOhr

'i I tl t I((((i$ DUCF F T NOV0t h EVENT DATE REMMT DAf[

[iyijinra t [ ] l W W ] 0l 5l 0l-l 0l 2l 9l 6J l 1l 0 l 3l 0l 7l 6l [] l l l lj

/ u !s / Sil L9 00 61 60 69 74 16 60 i VI fJi hl f.CHlf'ilOfJ gj pt 123010/30/76, 3B recirc pump tripped due to a burned collector ring on the 3B recir-l 7 li 0 80 Q hulation MG set exciter. The pump could not return to service within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and the'80l l en c4

[hl b it was placed in hot shutdown at 1130 10/31/76. The rine was repaired and brn=hna l

,H0 80

[r~] peplaced and the pump returned to service at 2230 10/31/76. (BFRO-50-296/7617) l 7 ti 9 80 I

EFJ l 80

/ O9 pnue (YOU c$t COM POfet N T CODE R M WF L,- A VI(1ATON

@ lCl Bl (E_) lG lE lN lE l Rl Al 17 l Nl 43 lG l0 l8 l0 l 44 47

[J) 48 7 UU 10 11 12 CAUSE DESCFhPTION

@ lIhe ring was damaged because a General Electric model 201A8908 carbon brunh vorn l 7 00 80 o SIlort, loosi11R tension ind causine arcine. l

/ H9 80

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'50 s Pom o 01- 4 s,Arus TJ"3# o.scoun< oEscame,

[iEl LBJ l 01 4] 12 0] 13l M l [A] l M l

/ h 9 10 44 45 46 80 n t of Er AvouNT OF AC T'viT y LOcti ON OF AELEASE

[1] La l izJ l NA l l M l 7 8 9 10 11 44 45 60 PinSONNEL EXPOSURES NuUtif A T1DI DESCI:tP?ON 1 Ql0lj [2] l NA l

/ O9 11 12 13 80 Pt RSONNEL INJURtiS NIA1Pt H f>( M H7 h09 EE 1010101 1 M I 7 09 11 12 60 Of TSITF CONSFOUENCES EB L m I 7 UU 80 LOSS (N DAMACF TO FACILiiY evi r t.4 sc iwroN EE La J l

• I i uu 10 80 rueucey 8306270031 761123 PDR ADOCK 05000296 PDR S g g

{][ 80 7 10 4,CDitiONAL FACIC AS 1

[ifj !Ihe brush inspection interval was increased from monthly to weekly, and a GE recommended l l

/ 6w eo l

[i] [ harder grade brush has been installed on both unit 3 MG sets. If the harder brushes l l U

7

"" prove to wear longer, the monthly inspection interval vill be resumed. l NAME_. PHONE:

jf g ,

GPO #91 497

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,o u,no, C L' IE FIT;E COPY g jj * ' Y8ENNESSEE VALLEY AUTHORITY h'i'L".\!9 CH ATTANOGGA, TENNESSEC 37401 V, bd[

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%.nic '3 . g l. 4,%

llovenbar 23, 1976 q,, O[c[h 4

NOV '2D ze m io I4Is NK279 g. N '

Ifr. Iiornan C. ifocoley, Director N'

• U.S. liuclear Ro;;ulatory Ccc=iccion h'

< ,g Offico of Incpection and Enforcercat Region II g Op N 230 Peachtree Street, In!. , Bth P3cor Atlanta, Ccorgia 30303

Dear lir ifocalcy:

T!'RIESS6E VA' AUTH3RITY - EROt.7iS PERRY NUCLEAR PLA?Tr UNIT 3 -

DOCECT NO._10-206 FACILITY n'"' ATI11 T.ICENSE DPR 1:EPORTABLE OCCURILEliCE RCp0RT DFRO-50866/761D The ancicoid report 10 to provide details concerning the 33 recirculation

, pump that tripped due to a burned cellector ring on the 33 recirculation 1:0 r et exciter. Thic report is nubmitted in t.ccordance with Browns Ferry Technic.11 Specificationa Section 6 This event occurred on Ercunc Terry Muclear riant t. nit 3.

Very truly youro, TEN!!ESSEE VALLEY AU'i710RITY H . S . Po):

Director of Power Production recloriuro (3)

CC (Uncionure):

Director (3)

Offico of Itanne:c:acut Information and Prenram Control U.S. Fuc1 car !!cquintory Counissten Uachin,~, ton , D.C. 20555 31rc2 tor._.UiO/

, Office of Innpection and En!nrceesot 4 U.S. Qtclear Itcy,uic.tery Corninsica 1.'anhingtca, D.C. 20555 9

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