ML20084U244

LER ER-77-010:on 770131,ice Loading on 345-kV Bus Tie & Station Power Lines Greater than Expected Due to Cooling Tower Plume Passing Lines.Caused by Environ Conditions & Cooling Tower Operation

ML20084U244
Person / Time
Site:	Palisades
Issue date:	02/14/1977
From:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-ER-77-010, LER-ER-77-10, NUDOCS 8306280264
Download: ML20084U244 (2)

Text

.

a..

. ~ .

V, UCENSEE EVENT REP Paticad ;s CONTACL ELCCX:l l l l l l l (PLEASE PRINT ALL REQUIRED INFORMATION) 1 6 UCENSEE L: CENSE LV?NT NAME LCENSE NUMBER TYPE TYFC

] l:!lIlPlAlLl1l 7 89 14 l0l0l-!0l0l0l0l0l-l0l0l 15 25 lLl1l1llI1l 26 30 l 0 l1 l 31 32 AEPORT AEPCAT NPE SCUACE CCCxET NUMBER EVENT CATE REPCRT CATE hCONT l

• l

• l lTl [LJ l015 l o !-l o l 2 l 5 l S l l 011 l 311 l 7 l 7l lol2l1lhl7l71 75 80 7 8 57 58 59 60 61 68 69 74 EVENT CESCA;PTION O2 l On Jsnusrr ?l .1077 ice lesdin: en the 3h5 kV bus tia andstationrevarlinesbatvaanl 7 89 CD 03 l the Palisades Plant and the svitchyard were cbserved to be grester than normally ex- l 7 89 60 0 l pected due to the cooling tover plume passing the lines. Plant power level was held l 7 89 60 0 l at 60,# until h PCP loss of flow vithout turbine renerator coastdcun could be analyzed l 7 89 a0

@ ] and croper operatien of both diesel generators verified. (ER-77-10) l 7 89 psmes 60 SYSTD 4 CAUSE CCMAGNENT CCMPCNENT CCCE CCCE CCMPCNENT CCCE SUPALER MANUFACTLFER VCLATCN O lEl01 ICl l:l:1 zi zl zl l 1: l lzlzI:lzl 47 lNl-7 89 10 11 12 17 43 44 48 CAUSE CESCBlPTICN Oe l Abnormal icing is due to environmental conditions and operation of the cooling towers. l 7 89 GC 09 l FSAR Accident Analysis (See lh.71 does not consider h cu=o loss of flow incident l

' 99 80 7 89

, l vithout turbine generator assist as credible. J raC:uTy METHCC CF Status  % PCWER CTHER STATUS C!SCCN EAY C:SCCVERY CESCA:PT:CN h d l0l6l0l l NA l lbl l Visual Obs of Tovers & Lines l 7 8 9 10 12 13 44 45 AS 80 FOAM CF ACTMTV CCNTENT AELEASE3 CF QELEASE AMOUNT CF ACTMTV LCCATICN CF AELEASE 1

l 3l NA NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPCSURES NUMBEA TYCE CESC3!AT:CN 1 13 l 0l 0l 0l l 2l l IIA I 7 89 11 12 13 cu PERSCNNEL INJUA:ES NUM8ER CESCR;PT!CN 14 l0l0l0l l NA l 7 89 11 12 80 PROP.ABLE CCUSEQ,UE:TCES ,

15 l None; loss of h PCP anal / sis indicates adequate MDN3R. l 7 89 20 LCSS CA OAMAGE TO FAC!UTY W PE CESC31ptCN

! UA l 7 d9 1C 50 UUGUC:TY A l

'd! 19 50 ADDITICNAL FACTCAS 19 l NA l 7 89 ea dl 7 8i NA 80 l

8306280264 770214 PDR ADOCK 05000255 t S PDR

a.

s .. ; p (~' )

C/ '

V

.=tX.s 7 Consumers

?l 4 Power A .., /// Company sms con

'<~~'

..o uob J

o. .. om...; m w. u. .. ... ...;..........~,., m e,.4,..co . m u..

February 14, 1977

. D\

A ! t

./( 4 -vN'W, Mr Ja=es G Keppler Office of Inspection & Enforce =ent A,\(,q 1 ,'

Region III s.- q s-US :Tuclear Regulatory Co==ission g .g' T99 Roosevelt Road 4- .%

Glen Illyn, IL 60137 ,

"" W ~

,s .

DOCKET 50-255, LICE'ISE DPR 's I PALISADES PLANT - IR-TT FOUR PCP LOSS OF FLO'4 On February 1,1977, we notified the II staff of increased icing on the trans-

=ission towers and lines between the Palisades P3 cnt and the 345 kV switchyard.

The consequences of a co=plete tower failure could result in a condition not specifically considered in the FSAR Section 1h.7 'de, therefore, initiated analysis to deter =ine the structural adequacy of the towers and lines as well as a h-pu=p loss of fl:V without steam generator coastdown. The 4-pu=p loss of flow analysis has been ec=pleted and trans=1tted to the NRC staff for review.

The results incicated the transient to be less severe than others presented in Section 1h.7 of the FSAR. Preliminary analyses of the trans=ission towers and lines have been co=pleted which indicate that a =argin of safety exists for observed ice loadings. Additional evaluations are being made to deter =ine if any modifications to the towers or lines are required.

David P Hoffnan (Signed)

David P Eoff=an .

Assistant Nuclear Licensing Ad=inistrator l

l l

1707

!