ML20043A571
| ML20043A571 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 05/01/1989 |
| From: | Morgan W COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 0102T, 102T, NUDOCS 9005220256 | |
| Download: ML20043A571 (44) | |
Text
{{#Wiki_filter:- . -- . ._- f, N Common ~;oalth Edison Oto e'
! !b 72 West Adams Street, Chicago, Illinois ' ' _' 7 XHdress R1 ply to: Pc3 Office BoDF. -
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'w/ Chicago, lihnois 60690 - 0767.n May 1, 1989, Mr. A. Bert' Davis. /
Regional Administrator-
;U.S.' Nuclear Regulatory Commission-
' Region IIIL 799 Roosevelt Road Glen Ellyn; IL 60137 .
l Subjects. LaSalle County Station Units 1 and 2 Response.to Inspection Report Nos..
~
l. !' 50-373/89007 and 50 ~374/89007 l HRC Docket Nos. 50-373 and 50-374' ( ., References (a): 'E.G. Greenman letter'to Cordell Reed dated March 21; 1989 (b): W.E. Morgan letter to:A.B.' Davis dated < ;
. April 5, 1989 l- ,
'l l l Dear Mr. Davist -
~
This letter is'in response to'the special inspection conducted by Messrs. S. DuPont, R. Kopriva,fD. Butler, R. Mendez, and P. Shemanski of.' certain activities associated'with the March 2, 1989 event at LaSalle County- !
^
Station Units 1 and 2. Reference (a) required a' written response of the-findings and conclusions associated with the March 2 event.. This was transmitted in Reference (b). Commonwealth Edison was additionally requested to respond to;the l unresolved items identified in Sections 5 and 6 of.the inspection report. The l Commonwealth Edison Company's response to the unresolved items is provided'in l the Attachment. ! i If you have any further questions regarding this matter, please direct. ') them to this office. l Very truly yours, ] MU QN1 .j V a'l
.W. E. Morgan Nuclear Licensing Administrator ,
Im i g Attachment !
.l cc: 'HRC Resident Inspector - LSCS -
! ]
P.C. Shemanski '- Project Manager, NRR n $Qy3'.,1989 9005220256 890501 PDR ADOCK 05000373 ' 0102T g , PDC. ..
-2.
s llNEESQLyID ITEM: 373/89007-01 i .' 374/89007-01 L
. . . The AIT requested records relating to the testing of the OCB and the SAT. -The licensee stated that the power factor' test (doble test)-and .(
the travel test (timing) of the phase B 4-6 OCB had been performed but'the results.were not documented. The inspector was informed that
.oll;samplen.from the 4-6 OCB and the Unit 2 SAT i were acceptable, although no; records were available'for. review at the' site.
Additionally, the licensee has not located'the power factor testing records for the Unit 2 SAT. The . lack of documented test result date
; associated with'large electrical equipment isLconsidered to be an unresolved item.
... The AIT attempted to review records' relating:to testing of the lightning arrester. 'The licensee indicated that the lightning arresters wero tasted by CECO Operating Analysis . Department' (OAD) but the data was not recorded. In addition, acceptance criteria for testing the lightning arrester was not available. The failed arrester was sent to the manufacturerL(Gene.ral Electric) for analysis to determine the failure mechanism. The licens'ee has committed to make the results available to the NRC. Since.large electrical equipment is routinely tested by CECO OAD and testing data is not ;
recorded or maintained, this is considered to be an unresolved item. , RESEQEEE: -I I
- Doble Tests of OCB 4-6 were performedaon March.9, 1989, after the- i defective B phase bushing was replaced, and documented by Syntes j Operational Analysis DepartmentE(Attachment A). ]
i
- Travel Tests (timing) of OCB 4-6 were performed on March 7,'1989, l after the defective B phase bushing was' replaced and documented by.
Southern Division Operational Analysis Department (Attachment B). i
- 011 samples from OCB 4-6 were tested and the results documented by Southern Division Substation Construction Department (Attachment C). 1
- Oil samples from Unit 2 SAT were tested.on March 3,1989 and the.
results documented by System Materials Analysis Department I (Attachment D). f
'l
- The Unit 2 SAT was not power factor tested during.this event. l Insulation' resistance tests (megger) and. transformer turns ratio l tests (TTR) were performed.on March 3, 1989, and the test results i docmnented by Southern Division Operational Analysis Department j (Attachment E). Megger and TTR tests, and not power factor tests, .
are normally used in the diagnosis of a transformer trip out.. ! I f s 1 l .
C, ; 3. l l L l l - ' As per the manufacturer's instruction manual regarding the testing of. . L ' lighting' arresters "These arresters do not' require testing.... .j l LThere is no single field. tent which wills indicate the complete tj operating characteristics of the arrester." (Attachment.F)
- The- <
l . replacement lightning arrester and the' original lightning. arrester- , were not tested by either Southern Division Operational' Analysis
~
/ ' Department or' System Operational Analysis Department. -
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Subject:
.LaSalle Station AIT Report Unresolved-items 50-373/89007-01, 50-374/89007-01'-
Mr..R. M. Hennigan:
=Information regarding Southern Division Substation Con-struction Activities related to the March 2, 1989 trip of SAT 242 has been received from Mr..K. Faber, Southern Division Substation Construction Superintendent.
Substation . Construction personnel: tested :the insulating oil-in all! three phases of 345 KV: bus tie 4-6 as it was removed from and-returned'to the circuit breaker. Breakdown values for'A,-B and C phases' respectively were 24 KV, 21= KV and 23 KV on< removal; 32 KV -:32 KV and 33 KV on return. These' tests were documented and data is-on file at the Southern Division Substation Construction office. (R,d3. 03s l R. B. Benvenuti L Gen.. Substation Supt. ;
'T & D Construction j
l RBB/mc ; 0142m l cc: K. E.-Faber 4 l. L L . .
-~ . _ _ _ _ _ . _ _ _ ,_. _ _ _ _ _ , _ _ ,r ,-. ,
cf777 cl . -i l SYSTEM MATERIALS AIALYSIS DEPARTMINT REPORT 05 TRANSPORMER CIL SURVIILLANCE MM d Division NU ! Location d
- Line or Unit'#
KVA d6 4dd Serial # I N 74 W Benchmark /2f . Make de - f , l Report No. k ; sample Date ,g-3 87 j Analysis Date J-J-87 ' AWsphric - Percent By Volume ; Data combustibles d./0 CO2 4/ .. j
. ..; . 02 . 8'[ ;
Parts' Per Million By Volume Hydrogen 4 gg m.than. gp b Ethane gp _ Ethylene gp -. Acetylene gp , i carbon Menoxide g carbon Dioxide g oxygen g gg i Nitrogen 7g g ,
% Total Gas 7g Supplemental ;
Analysis i Water Content, ppe -- Dielectric g strength, kV ./ l~ 1 ,
, s. . t s
-Report No. [ ,
i Additlonal* - Infoe. nation Purged Trip-out / Benchmark ; Interpretation ' of Results , Normal Condition'
- corona Discharge -
cellulose Involvement _ Arting ; overheating (< 150'c) Overheating (150-200*c) <
#0verheating (200-300*c) ,
conductor Overheating overloaded Joints / circulating currents NOTE: If interpretations appear serious, comments will bs made below, and appropriate people notified. Comments: 1 l l Reported By: gg - Date: 3 3.ff Approved By: g Approved By: Approved By: ; l 1 SEED Nanager j copies to: Division Operating Manager Division CAD Engineer SCAD Manager Mad'cq Mada. er asno g 3 c ,g , g jf ,,, j Teeo. Sy i:.M4 1
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VhtNUMBE3 7 WORK REO.UEST No. z a in wi , IQUIPMENT NAME UN6i LOCAT4GN j$Y$ TEM g
,yg $ Q / f l A Cuhk Nun IEPN
- c.$AT $&s ' ." n* e7L YA 2 kt
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'EM/wohnAkQuCJ.D n2 CAT /AMC es,*s n AO VfrYr r $&N & CdNC C __ e h Y'D. A*Ud bed *>lL. l bh 0 6Y /DATE TEST REQUIRED 1
'EdST YES @ N00 () /\ O .K')l K. A4.~ J/9/59 r'
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BY:0PO TSO MMC EMO 'iMO f N'h'OTN,R o.4 n M "O #PEI 25 A g C YE@ N00
, TECH. 5PEC REQ:
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LOAD REQUCTION UNI OUTAG3i
'RIORITY Jh ] YEsO NO gg RT fggL D ym !
lRE GULATORY MQQlFICATION COLE
'AFETY YEs C IRELATED WCRK ASME CLASS YEt O YESO YEsO
; ELATED iP ALL FOUR NO'S ARE CHECKED NO@ NO Q NOf} nog 'e' APP A + PLETION
.T. c EPT. A
] .] - FIRE HAZARD REVIEW:
%NCNE OPROCEDURE OSPECIAL NT [ MR) "*
- Q g j ALARA ACTION:
Gnf6TAPPUCABf.E ONCT RECUIRED OREQUIRED YEsCR NO O YESD NO O' EQ.: YES O NO E'#~~ ROUTINE MAINT. O
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/pATE ATTACHED CQCUMENTATION REQUIREMENTS WORK TO BE CONTRACTED 4 T/dT 4 v'*"- -
M PORTION O ALL O P.O. NO. u N ghR h # PROCEDURE O O CREW EST ACT l WORK AS$1GNED TO: RED TAGS O O S1!E M l i AINT. FOREMAN - CooE DOC. CHK. UST C O TOTAL /[j !
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TEN MINUTE MEGGER
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,( .. WORK REQUEST l E 7 7TV -j.. *
(J DATE: 1 /3 /_99 EGUIPMENT NAME: 347 [Y48 SM[ 242. EQUIPMENT NO.:
'_. MEGGER POINTS: N/6/[ S/OU TO 6fd DCTA MEGGER VOLTAGE:
MINUTES READING MULTTPLIER MEGCHMS
- e. ee $b C AGO
- e. ee 'ho 1 40 I. ee '/ 7.5' ,
5/75
- a. ee /?/ - -
.-274 _ .
-900
. . ee _/APo _
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990 --
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- s. ee 960 .
JCC
- 7. ce / COO
- e. ee 200 l000
- e. co Jno \r /600 .
t e. ce O 60 .6 /0 C C 975
-,so # /,/d 6c 30 SEC RATIO:
[006 POLARIZATION INDEX (ie:1 MIN RATIO): o? i [. / Y MEGGER QA NO. Ofl7/OL . EVALUATION: RE5ULTS: ACCEPTABLE, NOT ACCEPTABLE CAD ENGCNEER *4 ' trr .
F . ,
./ TEN M?NUTE MEGGER
, WORK. REQUEST _/ 2713',,_
)- 'DATE: J/ 3 /,,,,f 'T EGUIPMENT NAME: 347 ### ,
EDU1PMENT NO. Y 'J/UD/Afd. fA,6 C bk 7~/gr3}
,MEGGER POINTS: Y-D/N#/A//" TO dMND ..
DATA MEGGER VOLTAGE: 4600 VO C., r MINUTES READING MULTIPLIER MEGOPMS e.ee 190 '[ 850
- e. -e 19 f -
875 1.ee - 300 . /000
-. .- e.ee.. .-
l9$
$ ~?S
- 2. ee 12 f -
C25
- 4. ee b $U
' (.3T e. ee ISD 210 -
- s. ee /fd 7e '
7.ee /60 ' ggO
- e. ee /80 75 C
*. ee '7$ O
- 1e. ee ! 3 2[O l eOC_ 1 I Ll 6e:3e SEC RATIO: 955 - la! /
POLARIZATION INDEX (ie:1 MIN RATIO): o +7I MEGGER CA NO. O 52VoFSD , EVALUATION: RESULTS: ACCEPTABLE,- NOT ACCEPTABLE (;. h m [ . - _ OAD ENGPNEER
)( W IW O / W L- h l4I4,(4 6/W GICOED
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- WORK REGUEST j 7 7 91Y j
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DATE: l/7 /_ 9 0 l} l EGUIPMENT NAME: iMT JMM ECUIPMENT NO.: X (A) i M 61 K3 6 A.% b M5 7*lTDD ! i r MEGGER POINTE: X Ld1 M d/A/4 TO MC ll . DATA , MEGGER VCLTAGE: 2 800 VO C., j MINUTE 5 READING MULTIPLIER MEGOHMS (
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- e. co l [O
- 750 !
- e. o / (O r .
75# j
- 1. ee /6o 300 ;
- e. co I 90 .
8.50 j L 2. co !7f 7z(
- 4. ec IRo rod N,
E. ee 190 ' 90 0 :
- s. co i1[ 9PJ T. co I9f h3
- e. co Iff 9 76 i
- s. ee /ff V 975 t e. co I9f .5 9 75 .
9eCL - i pgC C [, S
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!' -i MEGGER CA NO. 0 5 A 4'o9' 50 EVALUATION: RESULTS: ACCEPTABLE, NOT ACCEPTABLE {
I CAD ENGl^4hER k 1 --- -- - . - - - i t f t i
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sa e:mn t,.:w r na i 4-u-n i m i mue an oscc.:Em a j INSTRUCTIONS e- ".'UfA*.; i 1 ALUGARIfil . STATION ARRISTERS
. MODIL 9L11M-SIR 115 3-312 KV .
! MCDIL 9L165-5ERII5 ABOVI 312 KV - l b
' CA UTION: TSE ESUlp. VENT COVERED EY The medal mtmher and et= sinu =us veltage rating I '
THESE INSTRUCTIONS 5.70CLD EE LYSTALLED of esck complete arnster are ttentttted on tke nntne. ;
% AND SIRVICES CNLY 37 CO.VPETIVT PER- plate which is attached to tholower enditttings. The -
l
) -
SONNEL FA.VILIAR tYlTH COCD SATETY DRAC. namepista taformation should be checksdagainstthe
- l
. T/CE3. TBl3 JN3?RUCTIC# IS 10tlTTIV ECR enipping mamorandem. Fatanytimeitts necessary ,
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SUC# PERSONNEL AND E NOT LVTLYDEJ A5 to correspond with the General Electric Company, - i f A SUBSTITUTE FOR ADEQUATE TMINING AND somplete nameplata dat*,shouldketurr.ishedL orter . j
'.
- EXPERIENCE IN SAFE PRCCEDURES 'TCR TRIS to espette replies.'
TTPE OF EQUlPMLYT. . The ALUGARD !! Statica Arrester is of single. L CA .
. Phase destss, euttable for outdoor service. Three M the amsterhtc@ clon u pac. i arresters are requiredforthne.phaseinstaustions.
- . 8maner, lowe r. ratee models are sMpped as semh'ad M 1e m a W p eted. b ey h u $
I
- while the larger, higher.ratedmeas1s e castat of four' and ground ccuecticas short and direct. +
.- l 1 to six Indvidual units which mustbe assembled. The '. l arrestere nquire no testing before being placed in FOUNDATION ,/ I
. & serrtce, and are completely self-supporting. -
The footinge of a chor y en or suppcMs - j Each ALUGARQ!! arrester unit emntains anum. should estend below the frest hne and be elevated j ber of TXY.UTE wyalve and alurtte gap elements
.' Permanently sealed in a poreelain housing provided above the grounc itne sufftetently to meet perscnnel -
8"II "S*I""*" l with pnssure-re!!af construetton. hietal end fit. e tings, cemented to the houstag, provide a means for 43ggg , boking the arrester units together erto afcunnetan. ; APPI,1CATICN Stagte. unit Arresters l
' Arresters are designed to limit surge voltages Each arrester, eacept those requirit.g gragng 'I l ,
to a safe value by escharging the surge curror. to rings, is shipped ocmpletely asssmbled, When gnd. j j ground, and to interrupt the pcwer.fnquencyfc110w ing F ngs are needed, bolt them sectraly onthe 11:e j l current. The ahtlity to interrupt pcwor.feu:w cur. end, before electrical connections are mate., l j rent is It=itad to applications where thepower-fre. All s!n 4. unit ratir.gs canbe suspensionmounted !
- 3. quency voltage at the arrester never exceeds the if the lh 5 mnection is stade to the top of the ar.
~
arraster's continucus or shert.ttme rating. Incase , of doubt concerning app!! cation, ecasult 7:ur local rester. 'M top cap of each standard ALUGAED 11 ; I General Electric Company representattve, unu has pt' dstons for attaching an tasdatcrcleds l l ntting. Special ALUGAIC 3 arresters rated 255kV ; b INSTALLAUCN and below can be supplied for rigid suspensten l V mounting from station strue:cral members. :
, CON Instan the arrester on the fcundation, using este ALUCARD U arresters are designedtowithstand to see that it is perpentcular, shimming under one l severe shipping shocles. In addtton, each unit is or two feet if necesasty. It is importar.t that all l shipped la a caref.tuy designed container. If the three feet rest solidly on the foundation belcre the !
I , crate or carten shows attns of rcugh hand'.tr.g upon foundation bCits are t!rawn down to avoid unneces. ; recetpt, the percelain housing thculd be inspected sary stresses in the castta.gs. ' Ttghten the belts -l
. !:r chtpe or encks. If damage isapparent, the ar. firmly. The opening for pressure reitet should ha !
rester,should not be instatied. CIAtma !cr such oriented So na to minladse damage to adjacent equip. j
. darnage should be registered immediately with the ment by incandescent gases in the remets event of ccamon carrier. arrsster fatture. .
g .W es'.e AW es. b ,ge ,6.y
- DW~ beA#.4ent$
Pt .P g. .a
-. . . ,.m c- :
. 5 W b M 14 x 7e et:M er 702s i A*'ii-?3 2
- 27 '- 1122i421II' IskG CIG3 3
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.,g CIX.34:37, ALUCAP.D E STATIC 8 ara 2:$TERS M'ltt.
a unit Arren'erst C1straness listed in the s;;tepriate ouths;rtnt
!! le 1:rportar.t thaiths'!ncytcual arrence units pac V.S tach arnstu an de mmumneem.
5 "U # ### ***"* ** "### 8 I" **** ^# *
, f to erected in the exact crier specifled en the cut. !
hte drawing sht; ped with each arnster he moest natm red H Wandhelcw naAe one.-sed ccm. . a number cf the arrester unit is given en tr.e unit p!stely using the same alearance values. The vduas i g shewn s.re suitable !ct alttr.: des upto 3300 feet (1000 I nameplate whlen is attache:t to the bettem er.dct.st. g g g ggg, g i g 14 The bue smit dse bears the larger arnster additional 3, g
- 10C0 feet of elevation. The arrar.gement 8 "
- 8.a% ate. af tse foundation plans shcwn en the cutthes can be i Install the base unit en the fcuncatten,using enn - modfted t! proper clearar.cos are inntatained. !
w E y 'ses te that it is perpecceular, eht:n=!ng under ene . . It is impettant th:t au gg,. m'" g C lgthree g or feet two notfeet solidlyifonneesesary. the fundatton befare the ' foundattan belts are drawn dcwn to aveid unneces.
,, , euy stneses in the castings. Tighten the bolts 3 48 kV modela GL11M arrerters can be used ' !'
i ; !!r=17. ne opening ier pressure. relief aheu d to trem 018'CCO feet a*"**de* i
,, g oriented so as tominimise damagetoadjaca:tequip. 80 312 kV arresters ean be used frem 010,000 !
gg ment by incandescent gases in the nmote event
- of int M*ttude. ALUGARD U arnstu nahg would ' I 3 g arrestar failure. ,, . .
anow those imits to be applied to 18,000 feet, but !
!- Select the ment unit carefuuy ty reference to the
's h outline drawing and bolt it secunty tothebase ur.it.
they must be limited to 10,000 feet because redue. tien of air density increases the peestbinty of ex' er a The end fittings are carefuur acized at the factory torsalflashover on these 9L11M2tA series arresters, i
** -' to aseurepartMelism,senefurtherehtmaingshould
- be required preytded it was carstuuy done wttenthe - ALUGARD 'E 'anesters,' .91.183 ' series .aan be- .
tase unit vu instaued usedtrem 0.'10,0CC leet altitude. ,
. i . .I., he has terminal esp hu a central hiting hele and it stay be used, it desired, as an aid to erection PER!CCIC IN37ECT*.CN -
By behang it temporarily to each umt ta tu.-n. ** AND MA!NTENAN,CE
- Es sure te inats.ti the gracing rings at the points ca'!ed fcr on the cut!!ne drawing. Befers inspecting or handling. disconnect the '
arneter from Ene and, as a safety pre:autten, $4 l LtNZ A.'c GROUND CONNECT:C::S gr=nd ce une end. AmonMs taparmmd before reconnecthg the arnster anto the line. Connect the arrester recund to the apparatus
- ground and the main station grcuna, uttun:ng a Fe.' ALUQAR: C arresters requits no special care. , ,
11th!e commen ground netwcrk cf low netstance. They may be hot washed, subject to the usual care o
- Cennectica to the une should be made tt.rcugh a and technt:;ues used in hot. washing insulation to suitable itne connector. Line connectier.s shmidbo "# '" 8 **I *' '
anade in such a mannerthatso excessive mechanical ' stress is placed Cn the arrester Psn conneettr.g These arnsters do not reptre teettag, and no ' I the arrestu to an enerTiaedline,it is t= perative test which appites power Tcitage in smeess of max!. that a quick, positive, centinucus actica be made to num arnster vchys aths no4d be mee w4' . ! aveld possitio da.tr. age to the arrester. cut consulting the GeneralI1ectri: Company. There
. is no single cold test watch win Indicate the ccm.
C.WT!CN. Al. WAYS El CERTAIN TRA7 plete openting characteristics of the arrester. THE C ;0 LWD C0hWECT:CN 13 TDL.\ FLY < yngggggzy .my ** yyg3*.
.%LDE BEFORE CCXXECT.*VC THE AR.
(', RESTL'l TO AN ENL'lCIEED IDE,17 , Percolain top arresters with center itna ter=1 AN IN3ul.A?!NC f! NIT 15 USEO AT THE na a are available and are particularly suited for , ;
'. CROUNJ LVD TC PIUt/T USE C7 A use in metal cubicles. Dase arnstns can be ;
I ' blSCH.tRCE COUX7'* Tue CISCEtRCE meumed in any postnen een instatedin a nasona. . COLWTER NUsT AECd.IVECTED (CR l' THE INSU!.ATLVC t.Wii SMCRTED 007) I * * ** '*# #'Y * #**' l* * * **' l BEFCRE CONNECTLYC THE ARRESTER DtSCMARGE Cot:NTIn3 TO AN LVERC Z?.D LLVE. . i CLEARANCE An traulating bue is required when instaning a g discharge counter with arresters. Bothatthoseare ' ( The term " clearance" means the actual distance accessertos and are described in Handbock Section u. , between any parts of the arrester at une potential S SIC. Instan tha dischtrge counter and insulating ,, and any object at groundpetenttaler:*her;ht.se po. base as shown on the outline druwing furnishedwith 'a i tential, the counter. ,. OtNERAL tttCTRIO CDMANT, P30f11Tlyt [1UlPMINT PROCUCis DEP A2TutNT, PITT!llflC. M At!. Cl!3I
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l The following report details the analysis of the lightning arrester which was sent to the manufacturer (General Electric) to determine the f ailure mechanism. ] On Monday, April 10, 1989, Gregg Mathewson of System Electrical Engineering Department witnessed in the teardown of the subject lightning , arrester in the GECo factory in pittsfield, Massachusetts. , 1 On the day of the incident at LaSalle Station visible external evidence was found to indicate that the arrester had failed internally. The area around the top expulsion port war darkened and metalle splatter was found on the porcelain at the area of the top expulsion port. No evidence of external flaphover to the base of the arrester was found. It was surmised by all at the site that the arrester failed internally. flowever, upon disassembly of the arrester at the f actory, no evidence . of internal failure was found. The internal spark gaps were all intact. l Also, the top and bottom expulsion ports and seals were intact and had not operated. i The factory inspection conclusively indicated that the arrester had ,
-not failed internally (Attached). !
On Thursday, Aptl1 13, 1989, Messrs. L.R. Yule and R.T. Cameron of j the System Electrical Engineering Department met with Steve Samolinski from LaSalle Station Technical Staff. The area around the SAT 242 transformer was J inspected in an attempt to, locate flash marks on grounded objects near the SAT 242 transformer CO lightning arrester. A brass nossle on the deluge system near the CO arrester showed definite signs of recent flashover burning as viewed through a 50 power telescope. It is our conclusion that an external CD to ground flashover occurred from the CO arrester top can and grading ring to the grounded deluge system brass nossle. It is further postulated that conductive debris was blown across this area to cause the flashover. (The air clearance is too great to cause flashover in air for the protective level of this lightning arrester.) l Attached is a copy of weather data obtained from LaSalle Station indicating l that the wind direction at the 33 foot level was from the East at a speed of approximately 22 MPil the proper direction to support this postulation. Additionally, the following clarificatloa needs to be made in reference to page 15 of the AIT report concerning this incident. In the second paragraph of Section 4 of the report, it states that this incident caused a "catastrophle" failure of the lightning arrester. It should be noted that the utility industry generally reserves the word " catastrophic" when applied to arrester failures to indicate the arrester porcelain was shattered , and .trewn over the area of the incident. This clarification is made so as to identify that there was not a violent failure of the lightning arrester. 0102T l l l e , s
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r l 1 . f GENERAL _ ELECTRIC LEORMAL.REPDRT_.0H IHE_IMSASSIMBLY ANILINSPICT10H_DE ; 1 1 IllE_EllMliA261_ALUGAR1LETATIN ARRESTER 5 i 1 v b L 1 ( i 6 6
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-i~ . MEMORANDUM L Disassembly and. inspection of an Alugard-9L11MHA264 arrester returned from s'ervice by Commonwealth Edison Co.
S/N 48007.1Date Code L76 This report discusses observations and conclusions made during disassembly of the arrester with the customer _. representative Mr. Gregg Mathewson present on 4/10/89.- Descrietion of the unit. includine east historv. The. subject _ arrester was installed on phase C of-the unitL2 Sys. Aux. Tr.242 of the LaSalle' County Generating Station. In approximately 1984 it was found that the Tr.142 and 242 arresters had been installed and. operated since b; installation without the proper grading rings and at:that. time' corrective action was taken. The lack of a grading ring will result in higher than normal-voltage.across the upper gaps causing some degradation in the sparkover .h characteristics, a higher.than_no'r mal operating temperature of the upper grading rods,- and a likelihood of internal I;! corona in the internal upper portion of'the arrester at f normal operating voltage. On.01-28-89, at'23iO2 Hrs the
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station tripped on differential. Note that the arresterHis outside of the differential cone, so an arrester failure should not cause differential 1 tripping. The station record ; showed that for 18 see, before-tripout_there was a ground ! current indicationoof >= 200 amps. The record showed a pole . disagreement on breaker opening.-The event oscillogram shows , 4.5 cycles.of fault current coincidental withLa collapse of the C phase voltage and in addition a half cycle. collapse ~of j the B phase voltage just prior to-breaker. opening. The' fault j current is listed on the. oscillogram as 4875 amps _although : the available was stated. to be 46'Ka. Upon inspection of L the station after the event ~the upper end of this.C phase , arrester was." smoked up" in the vicinityLof the pressure-rel~ief port indicat-ing. operation of1the upper pressure-relief port (See attached photo #1). Also noted.was-a ; cracked bushing on the breaker. The, breaker.was repaired. ~
- the arrester replaced, and the station.was thenireenergized '
L successfully. At the time of the!eventithere was reported to l be some rain and tne temperature was probably;about 40F, DisassemhJv of the arrester ' A visual inspection confirmed' extensive " smoking" of the j upper end of the housing in the area of the pressure relief L port so it was assumed without further1 investigation-that. venting had indeed occurred and the arrester was tnen. opened-by melting off the lower.end casting. The lower _ gasket was-found in the proper position and in. excellent condition (Photo # 2) and there was no burning or arc marks-of any , kind on the lower aluminum sealing plate (Photo # 3) . The. i lower three arrester sections were removed through the i bottomLend and found'to be-in generally very' good condition-with no indication of any f ailure arc (Photos # 4 ,5 ,6) . The only-deterioration noted was that.the nylon _ washers used to 1
n g -- o . ; -a
.A ~ .v, '\ accure thfi cpoxy; glass clamping' rods hnd becoma brittle-from Ein . oxidation to thoipoint iwheroithoy mechanically gavo.way-and Jreleased the tension in the-stack assemblies. The effect of this was that-the stacas tended-to fall apart when removed.
from the housing as seen in-the photos: however, there would be 'no-adverse effect in theJerect unopened arrester because the compression'springstin.the'as's'embly act?to. captivate everything in. place. That is,.the.t~ie rods only serve the purpose ofLfacilitating arrester assembly and stabilising the internal' parts during' shipment. The grading capacitors in this Arrester'were Erie units', code 05266, with the brown encapsulant introduced to cure the problem with c one imbrittelment experienced with some ofothe earlier: red' units.-As; expected they showed~no degradation even;though
~
there was obviously much ozone present as evidenced by'the
. yellow color of the nylon washers. '
.The upper'end casting.was melted off next to' facilitate removal of the upper internal unit ~and'to. inspect theLgasket-seal and lead preuzure reliefLdiaphram.,This gasket was also-in excellent shape and the seal had not been violated. That.
- is, the lead pressure relief diaphram had not ruptured or l vented in any way, photo # 7'shows-the interior of the upper :1 and lower sealing systems as they were when' removed and -!
photos # 8 and 9 are of the inside and outside faces . respectively of the disassembled. parts ofLthe. upper; sealing and pressure relief system. . . At this point then it was obvious that this arrester had t not failed and must not'have contributed to.thetevent.sThe arrester contained 44 gaps and,1 counting from the bottom, gaps 1, 11 21, and 44 were removed, te'sted for sparkover, and dissected. The'results of the tests werei i Gao # R.N. Start S.O. Normal S.O. _, 1 6.0 Kv .13.5-14.5 -Approx 14 11 7.5 Kv 9.03-9.15 -Approx 9.1 j 21 7.5 Kv 8.97-9.03 Approx 9.1 44 j 8.0 Kv 13.6-14.1 Approx 14 - The test values are essentially normal .: indicating little'or no deterioration and this would be expected from the fine appearance of the internal parts. particularly significant are the results on gaps 11 and 21 Which are control gaps and are in as good as new condition. The end plates were then removed from the gaps revealing, as seen in photo # 10 that the electrodes and are chambers were also like'new. In . fact a close inspection of these partsiindicate..that either the arrester never experienced a discharge or, at the worst,- any operations it did see were very benign. photos # 11 and^12 show details cf the are damage to the
-upper housing and"in particular photu'# 11 revealsithat.
although of course a high current are did contact the. housing it did not significantly mark the top. petticoat:and hence could hardly have' originated.anywhere near the' upper relief vent. There was considerable residue deposited on the t housing which appeared to.be primarily organic and with
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numerousLaplatters'of copper. The. organic deposit led to speculation that the are may have' involved'a loose insulated
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' lcad end Mr Mathcuson=took como wipos.fromLtho:curiccocto-
- L oco-if-it could bo identified by: chemical c a lysis, Photo o a 13'ofrthe upper end fitting shows. evidence of'amall are marke or. splatters but no evidence of a hign current arc-termination. Photo 4-14 11s oftone of the grading ring mounting ears of-the. upper end fitting and shows an.
- indication that acheavy current;may have flowedLbetween:the~
casting'and the grading ring: mounting strap VPerhaps'the external are current: flowed:through the? arrester drop lead.
, . then-tofthe casting and the grading ringLand then off the
. ring to some adjacent object.' ,
Summary The arrester had not' failed and did not vent andf therefore is not considered to be-the causetof:the event.,The-1 internal parts-wererin excellent' condition;exceptoforEsevere: , oxidation of some organic parts,sparticularly.the nylon tie
,1 rod retaining.washersr The washers at'the'. upper end were:in
- far worse shape.thantthoseJat the loweriend probablyiboth because operation without a gradingLring;would'eauce 7 internal corona in.the, upper,part and thus. generate ocone-
' which is'a strongsoxidicer and also because the upper f f
parts would be~the/ warmest, also enhanced by the lack of a: y grading ring -It must' be emphasicad1however.that in spite of ! the severe onidation-of: some organicsJthe: writer does not-believe that - this had any . significantef f ect: onothe reliabili ty and viability of the arrester', : AllL of f the < important parts includingethe gaps, gradingicircuits, valve-elements, and seals were essentially unaffected. lit-is the- " writerr recommendation that the lack of grading: rings should' not be considered as having: compromised.the reliability of 1 , - the remaining arresters, ' t Jj t
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UNRESOLYED ITIM: 373/89007-02. 374/89007-02
... The AIT discussed with the licenseei the availability of reliable
-sequence of event information. The111censee had no formal policy to ensure that idien one unit's process computer was on' alternate powerf supply.for UPS maintenance that the other unit's process computer was"
-s not out of service-for. maintenance'or on.its alternate power supply.
This1would also1 apply to the Hathaways.;,The licensee has initiated-an action. item ~to review,the-AIT's-concern.- Review of the licensee's actions is considered:an unresolved item. t RESP.QNSE: The policy for.the-Process Computer.and'Hathaway, sequence of events recorders Power Supply-(PS).has been revised.-!The status of each PS will be' recorded in-the shiftly. operator rounds package. If the PS is11n bypass','a= work request will be initiated'or verified'to be outstanding to ensure the problem is' corrected. PS work requests which require the PS to be placed l'n
-bypass.will be classifiedLas' priority Bl.
If the work requires the Unit to be placed in a different condition to complete the work (e.'g., Unit must beLin shutdown), the work will'be performed at the next opportunity of sufficient duration. An engraved sign ~will be placed by the Hathaways. power supply,
-breaker requiring that the shift supervisor be notified prior to changing over to the alternate supply.
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