05000219/LER-2012-001, Regarding Reactor Scram Following a Transmission Line Trip
| ML12284A237 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek (DPR-016) |
| Issue date: | 09/21/2012 |
| From: | Massaro M Exelon Generation Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RA-12-103 LER 12-001-00 | |
| Download: ML12284A237 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2) 10 CFR 50.73(a)(2)(vii)(A), Common Cause Inoperability 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(1) 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 2192012001R00 - NRC Website | |
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{{#Wiki_filter:-.* I 1 E;<elon Generation. Oyster Creek Generating Station Route 9 South PO Box 388 Forked River, NJ 08731 RA-12*103 September 21, 2012 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 www.exeloncorp.com Oyster Creek Nuclear Generating Station Renewed Facility Operating License No. DPR-16 NRC Docket No. 50-219 10CFR 50.73
Subject:
Licensee Event Report (LEA) 2012-001-00, Reactor Scram Following a Trip of the 230KV Line Enclosed is LEA 2012-001-00, Reactor Scram following a trip of the 230KV transmission line. This event did not affect the health and safety of the public or plant personnel. This event did not result in a safety system functional failure. There are no regulatory commitments made in this LEA submittal. The detailed analysis of the event, determination of the cause of the unexpected trip following a single phase to ground fault on one of the three 230KV lines and circumstances surrounding the event is being investigated and will be reported in a supplement to this LEA. Should you have any questions concerning this letter, please contact Jeff Chrisley, Regulatory Assurance, at (609) 971-4469. Respectfully, ~/);1;._ .... -r;;,.,. Michael J. Massaro Vice President Oyster Creek Nuclear Generating Station Enclosure: NRC Form 366, LEA 2012-001-00 cc: Administrator, NRC Region 1 NRC Senior Resident Inspector-Oyster Creek Nuclear Generating Station NRC Project Manager - Oyster Creek Nuclear Generating Station
NRC FORM311 (10.2010) IJ..S. NUCLEAR REGULATORY COMMISSION APPROVED BY 01118: NO. 3150-0104 EXPIRES: 1M112013 LICENSEE EVENT REPORT (LER) (See reverse for required number of digits/characters for each bloc;~()
- 1. FACIUTY NAME Oyster Creek, Unit I 4.. nn.£ Reac:tor Stnm Folknving a Traasntissloa LiDe Trip
- 5. EVENT DATE t. LER NUMBER
- 7. REPORT DATE
- 2. DOCK£1' NUMBER 05000 219 1--*- *-
I
- - r::::
I FACIUTYNAUE 3.PAOE 1 OF l
- 05000 MONTH I DAY *
- YEAR
_ YEAA ~~~~~~ ~~ ~TM~. O~V-: ~~ 07 l 2J I 2011 2011 J 0 09 l :n lOll "F;i;ciiJTy NAME
- t 1 ~X>CKET NUMBER 1
l 05800 t. OPERATING IIODE
- 11. THIS REPORT 18 SUa.TTED PURSUAHT TO THE REQUIREiiiENTS OF 10 CFR t: (Check slllf)at appM N
0 20.2201(b) 8 20.2203(a)(3)(1) 0 50.73(a)(2)(l){C) 0 50.73(a){2)(1111) 0 2<).2201(d) 20.2203(a)(3)(li) 0 50.73{a)(2){1l){A) 0 50.73(a)(2)(vii)(A) 0 20.2203(8)(1) D 20.2203(a){4) 0 50.73(a)(2)(H}(B) D 50.73(a)(2)(vlii)(B) 0 20.2203(8)(2)(1) 8 50.38(c)(1)(1)(A) 0 50.73(a)(2){111) O 50.73(a)(2)(1x)(A) 0 20.2203(a)(2)(11) 50.38(c)(1)(U)(A) 0 50.73{a)(2)(1Y)(A) a 50.73(a)(2)(x) 8 20.2203(8)(2)(111) § 50.38(c)(2) 0 50.73(a)(2)(v)(A) 73.71(a)(4) 20.2203(a)(2)(1v) 50...e{a)(3)(H) 0 50.73(a)(2)(v)(B) 0 73.71(a)(5) 0 20.2203(a)(2)(v) 50.73(a)(2)(1)(A) 0 50.73(a)(2)(v)(C) 0 OTI-fER 0 20.2203(8)(2)(111) D 50.73(8)(2)(1)(8) 0 50.73(a){2)(v)(O) =~~
- 10. POWER LEVEL 100
- 12. UCENIEE CONTACT P:OR THJS l£R FActuTY~ """****-
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J ames Barstow, Regulatory Asaunnce Manacer 1 (609) 971-4947 t 3. COMPLETE ONE UNE FOR EACH COMPONeNT FAILURE DESCRIBED IN l"HtS REPORT
- ~;E
'1*- ~YS~M - *: ~~.. ~~~~ r-FA~::eA* TRE*~~iLE w.r* ~~$~ -- l-s;s~~ ' ~~PO:;~-;.. f~~i:*-,RE~~~~E N/A N/A-~ N/A I N/A N/A - N/A N/A N/A N/A l N/A
- 14. SUPPLEIIENTAl REPORT EXPECTED (i] YES (If yt1$. complllfl1~ EXPECTED SUBMISSION DATE}
QNO
- 11. EXPECTED SUBIIIS8ION DAT1:
MONTH DAY YEAA 07 lOll On July U ; lOtl, a Re.ctor SCRAM and'Loss of Oftsite Power (LOOP) c>l'aarred wbea a112JO kV tnn1111issioa paths from the **-don tripped unexpectedly following a slagle pilaR to ground fault o.a oae or tile three IJaes. The over tripping event resulted from the actuadoa of the direcdoaal oven.:arreat grouad relays (KRD) asaociated with the two remalniac Haes. These relays *m*ttd wbm tbe eurnnt polarized dltfttional signal caused tbe directional contact to clase and complete tbe trip drcuit.. As a result of the lcm of ofl'slte power. the unit automatically scrammed from 100% with all control rods fully insertl.nf: and all sarety system* funcdoaing as reqmred. Both Emergeaey Diesel Geaeraton automatidlly atarted and tarried loads on the safety buses. Oyster Creek det:lared an Unusual Event hued oa a loss of olfake power for gre~Ur tban 15 minutes. AI dedaratioDJ and nodfitatlons were made corn!dly aDd Ia
- timely ma.aner.
Tbls event is being reported pur.suadt to IOCFR50.7J(a)(2)(1v)(A) due to *utomatit a<<uation of the reaaor protection system. The caii.M or tbe over tripping event is being iavestipted aad wUI be reported ill a supplemental LER.
NRC FORM MIA ~~ UCENSEE EVENT REPORT (LER)u.a. NUCUAR REGULATORY coiiiiiSStON CONTINUATION SHEET
- -*-----t.___2._DOC KIT t. LERNUMIIER 0~ ***--~~~R--! $~~~~[;~~r-******~
._ ____ 1.FACIJTY NAM1 OytttrC~ lJait 1 %012 881 00 NARRA11VE Pleat Coadltioa Prior to Event Ewat Dati: July 13, 2012 Eveat Time: 0329 EDT UDit l Mode: Po*er Operattoe Power Level: 100%
Description of Event
- S.PAGI OF At approdmately 3:19am oa July 23. 20U, a phase to grouad fa1llt occurred on tbe S.2845130 kV tnnsmwion line. The phase to 1f011Dd fault resulted Sa Oyster Cn:ek switebyard breaken.. NS" and "'SD"' opeaia&o. This waJ an expected respoase to an actual (auk on this line. Co,nddeat witb the 41oNS" and WSD" breakers opealng, the Oyster Creek breakers
...-cec~ witb the N-1028 aad 0.1029 Uaa. "'NC"', "'C" and "'D'\\ al opcud. TWa was n.ot,. npe.cW ~to a plweto crouad fad on die S.l0451ine. Both JCP&:L an.d Atlaadc City Electric: fault. monitoriD* equipmentvaHdatecl that tbe f1ult wasapproJimateJy fl*e milts away from tbe Oyster CIW.k Switch yard. Uae inspedioll$ did not Jdedtify the aust otttae iniiMI tnlt. Witb all three 230 kV U.es out ohlle swltdlyiU'd lost, the lcladiagea tb. Mala G&Mncor wn rcduted. This nsulted hun, increase in turbine speed whiclt prompted the goveraor control syatem to npidly dose turbine eontrol valwes. Au* .-.ntioa reJay seased dle lowerint control oil presaure and inldaced ** R*c:tor SCRAM once the low pressure trip: setpoiat was racbedi; Appros.butely two (l)seco~~~da iDto the traolient. the Matdtou substati.oo (wben J'i.1.l8 a ad G-1019Une terminate)' breaker u.otiated with: the N'-10281ine atttmpted to ~Jose; howeveuince the Main Genentor output breaken were stilt eloHcl.th 230 kV bu wat aotdHM~QOJ':was it $)'Dcbi'Oidtccl <<Jthetn.-~&y~tem. TM ~1028 breaker immediately tripped due to breaker syaehronizatlon lnterlotk proteetloa~ This was aa espected mpon-.:.The 0.1019 broker iD Manitou il equipped with a &yaci*Ch.eek.Refaywllkhpmeiced the 0..1019 bl'ftker from attempting to *re-e~ose; Approdmate&, 20 seconds IJito the.trusitat. the lJO. kV.bus frequency fd below tile under frequency tetpoint and a Main Genet~~tor IQdcOI&t... Will receivect*peai\\&th* *-~ntorOiltput breaken., GCl alld(;.Dt. and. the Mala Generator IWdbNMefi; With the130k\\l' busdMaerDzed~ the. only sou~eto the 34.5 kV buses add Startup trusfonners wu the Q-1%1 tetder. 'nialfn.e wu overloaded brtlte S&rtupTnRslomen **~,...n as the 34.5 kV syttem.loacfa* extel'dal to. theJtatioo *. ne owerloadtdQ..tatline trlpped'audmulted. Ia 1b!tic:OmJ)ltte Loss of Off Site Power. A.t ~ ia the.Cl¢ VFSAR Htdonl;. S.Zo.J **d U.l.t. onf'tOIIIdml"of thilliae followiog'a compJetelGu~.of 130.kV Js ex~ Tile 0\\'ertripplRg event rea~l'ro* tbe acma-of the directional 4Wereurnnt ground rebays (KRDJ iWCM:ftltedwith ther two nmaiaiag Unes. 1'I:Nse relays actuated wbftl th.t curreot.-olarized direetionalsipal caused the dirfttio....._l c:ontad to c:lose 111ad complete tbe trip circuit
NRC FORM *A (tO-:lO'IO) LICENSEE EVENT REPORT (LER)u.s. NUCC.EAR REGU1.ATOfffCOMMl88ION CONTINUATION SHEET ()ys<