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RO I-80-01:800407,reactor Tripped.Caused by Loss of All Offsite Power.Natural Circulation Established.Bus A1 Put on Startup Transformer 2.Bus B2 Was Tied to B1.B3 Which Was Tied to B4.Diesel Generators Secured
	ML19323B003
Person / Time
Site:	Arkansas Nuclear
Issue date:	04/07/1980
From:	; ARKANSAS POWER & LIGHT CO.
To:	;
Shared Package
ML19323A999	List: ML19323B003;
References
	NUDOCS 8005090099
	Download: ML19323B003 (37)
	v • d • e

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. . 8005090099 S

Paga 1 of 5 ra- .

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, - UNIT TRANSIE!!T REPORT 1

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Report No. r -

so - 01 .

unit year number Date/ Time of Transient 4 / 7 /8'O / 1848

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A. TRiRSIE!!T OtSCRIPTION .

The unit trip was caused by the loss of .all off site power. (See attached sheet). ,

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Prepared By: ::h[d!// .. %. > Date: $ hS~/R0 Re.'isaed By b 'A ct[ ' Date: /* 4

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< ?' ar,t Ferf omance St:parvisor 2 .' ' i . :- f 3y : fr ,MA -

C'k N ' Date: l$ tid r.3.nt Analysis Superintendant Re ii.,ed By:

snager ef/

< d Operations & ".aincanance Cate: YOO<

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TRANSIENT DESCRIPTION On April 7,1980, at 1655 hours0.0192 days 0.46 hours 0.00274 weeks 6.297275e-4 months , the operators were notified by the system dispatcher that there was a tornado warning for Yell County. At 1709 hours0.0198 days 0.475 hours 0.00283 weeks 6.502745e-4 months , the Number One Diesel Generator was started per Emergency Procedure 1202.44,Section II. At 1728 hours0.02 days 0.48 hours 0.00286 weeks 6.57504e-4 months , the 500 KVA line to Ft. Smith was lost and 57. ~

minutes later the 500 KVA line to Mabelvale followed. Reactor power was at 100%. At 1848 hours0.0214 days 0.513 hours 0.00306 weeks 7.03164e-4 months , the Generator tripped and immediately the Reactor tripped. The unit trip was caused by the loss of all off site power. Due .

to the initial spike of the RCS pressure, it is believed that the Generator tripped first on an electrical fault ~

signal with the Reactor trip following.

Itmediately the Diesel Generators performed their design function of auto- -

matically supplying power to buses A3 & A4. During this time, operators manually initiated High Pressure Injection in order to recover the degradation in primary pressure. High Pressure Injection flow was obtained with P-36A

& P-36C through three out of the four possible flow paths. Because CV-1227 (High Pressure Injection Isolation Valve on Loop B) did not open, one of the flow paths was not available.

After the initial spike in RCS pressure, .immediately the pressure dropped to 1860 psi. This was due to the drop in secondary pressure & the injection of Emergency Feedwater to the OTSGS. dropped to'567'F and then increased about 6* in about 5 minutes. Then T Tg'egantodecrease.

b This increase and subsequent.,decreasecorrespondstotNeReactorCoolantPumpcoastdown'and natural circulation being established. Over the next 30 minutes there was sese oscillation on T due to changes in secondary pressure from Emergency H

Feedwater injection and steam dumping. Since High Pressure Injection was initiated, RCS pressure and pressurizer level recovered and went high. For approxicately the next 45 minutes, precsure wa's controlled by High Pressure Injection, Pressurizer Heaters, and Reactor Coolant being manually relieved to the quench tank through CV-1000. During this time, margin to saturation went high and remained well above the desired 5 2 At 1900 hours0.022 days 0.528 hours 0.00314 weeks 7.2295e-4 months , the operators verified that natural circulation was established.

Two minutes later, Bus Al' was"put on Startup Transformer #2. Later Bus 32'

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vas tied to B1 and B3 tied to B4. At 2354 hours0.0272 days 0.654 hours 0.00389 weeks 8.95697e-4 months , the Diesel Generators were secured. The final plant condition was Hot Standby with T gyg at 537 F and ECS pressure at 2150 psi.

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Page 2 of 5 B. IfilTIAL PLAliT CC ;DITIO::S i C 1. Reactor at 100% power *

2. #1 Diesel Generator running .

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C. OPERATIt!G PERSOit!EL 0! DUTY j SHIFT SUPERVISOR: Bill Moon i

PLAtlT 0?ERATOR: Roy caphart ASST. PLAttT OPERATCR: . Dan smith..-....

IGSTE C0:1 TROL OPERATOR: steve cunnins

. AUXILIARY CPERATCRS: T.arry McGee OriE?.S: nif: Tech-i.:a1 ;.d eisor, nen Ire n 1

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. Paga 3 of 5 D. I!!!TIATIf!G EVENT C . -

Loss of all off site power .

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geg E. SIGilIGICAtlT AUTQ1ATIC CG4PONENT STARTS / STOPS' (1) Nu:nber 2 Diesel Generator starts (2) Diesel Generators tie on to A3 & A4 (3) P7-A &'P7-B

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F. SIGHIFICAtlT PeJIUAL ACTIONS TAKEN (1) Manual initiation of High Pressure Injection (2) ERV-operation to Quench Tank, (3) Placed Al on.Startup 02 (4) St'op P7-A & P7-3

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Paga 4 of 5 G. SEQUEflCE OF SIG ilFIC; fit ACTIO::S, E"EtiTS C. See Transient Description & the attached copy of the Station Log &

the STA Log. -

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H. FII;AL PLAliT C0::DITIC::S F.o t Shutdown conditions TA ,;g WF RCS Pressure 2130 A, C, & D RCP cpcrating e

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Paga 5 cf 5 I. PRCCECURAL PR03LEMS OR HUP.All ERRORS

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None .

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EQUIPMENT MALFUNCTIONS CV-1227 (HPI Isolation Valve Loop B) failed to open due to manual engage . -

level being' stuck in Engaged position. (See LER No. 80-13)' .

SEL computer & SOVA computer failed because of the loss of power. Power: . - -

was not picked up by the computer because the inverter was selected to

. alternate power. .

C.

K. CC"SlHED PLOTS OF PERTINENT PRIMARY / SECONDARY PARAMETERS- ---

Due to the loss of the computers, the Plant !!onitoring System was not available for data retrieval. For the response of some primar'y/ secondary parameters see the attached charts.

D.R. Brown 22:10 4-7-80

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SHIFT TECHNICAL ADVISCR LOG ~ -

Tornado Warning Received From Pine Bluff for Yell --

Ccunty Until 5:45

{S(Primarily applicable to Unit 1)

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17:28:36 - --

Lost 500 KV to Ft. Smith B#5106, BG5102 18:25 Lost 500 KVA to Mabelvale B#5110 18:33 , Bad lightning strike on system 18:36 Dispa'tcher asked for 200 M. load drop on Unit #2 18:45 Power reduction begun on Unit #2 18:48:00 Both units trip - loss of offsite power - degraded power lost computers ~ both units with diesel running"frem i tornado warning 18:52 "B" EFW Pump running 18:54 On diesel power only .,'(.

HPI initiated manually on Unit 1 18:56 Both units seem to be under control 18:58 Throttling,HPI Unit 1 18:59 SG's 0 50% Unit 1 19:00 Both units indicating. natural circ'ulation 19:02 Al on SU #2 Unit 1 19:05 ,'

AT at 46' Unit 1 19:09 Closing main steam valves - still open (refers to P7A steam inlet valves) 19:11 Quench tank @80% Unit 1.

19:12 Getting off BWST 19:20 Closing P2A discharge valve 19:24 Stable offsite power confirmed restored 19:27 Starting ccadensate pump 2P (need EFW) 19:32:16 Main turbine still turning 19:33:30 Transfer to atmospheric dumps Rx pre'ssure dropping'~

19:34:16 HPI flow manually increased 19:35 Generator is ldatrip SU #1 is L.O.- no flags in back 19:36:33 Condensate pump started 19:37 Throttle HPI 19:38 Pnr. level high - ccming down 13:;3 SU 71 inspecti:n in ' progress 19:40: 33 32 tied to B1

?:43 SG's 0 3C5

!?:44 "a rgin to e sturati .r. 2 s tima ted a t mini: am 7G 19:46 SU '!1 virus 111.incre:ted, status questionable 13:50 Chech MS' AS3, opened same 19:iS HPI off f 3's 0 50%

19:51 "ain turbine turning gear en manual 19:52 !!ain tuctine en turning gear confirmed 17:54 Fnr, ircel cening i:vn e

Shift Tachnical Advisse Leg Page 2-Unit #2 attempting to start "A" Cire. H 2O - failed -

19:58 Try:.ng to operate FW block valves 20:01 See ring steam EFW pump P7A '**

20:02 Un' t #2 starting RCP 20:04 Re4rmed ERV Monitor Audio Alarm 20:06 Attempted "B" Cire. H,0 Pump start - failed 20iO8 Placed'in Pull to locR

20:09 "A" Circulating H2 O pump started 20: 10 ,

closing bypass to DI's 20:14 . Sat.' margin @ ~ 80*

20:18 Condenser spray open .

20:18:45 "A" Main Chiller en '

condenser #1 vacuum 25" #2 vacuum 28" i 20:21 Increased auxiliary bldg. activity noted 20:24 Operators comment that all emergency systems have operated ok 20:25 Put FW pumps on turning., gear 20:23 B3 & B4 load centers tied'together 20:30 Closing atmospheric dumps 2676 & 2619 20:32 H. Miller confirmed SU #1 visually OK 20:38 SU #3 investigation started 20:50 Hit resets on MFV block valves .

21:06 H1 energized '

21:06 RCP 'C' oil pumps started 21:08:45 RCP "C" .. rted OK 21:14 RCP "A" oil pumps started 21:17 RCP "A" started OK 21:18 Attempting to close FW block valves 21:19 Closed FW blocks 21:22 BRK's closed 1205, 1218, 1215, 5122 & Unit 2 indicates #126 closed 21:25 Unit #2 starting 2nd RCP 21:27 H2 energized off SU #2 on 2nd attempt 21:27:30 A2 energized off SU #2 21:30 Preparing to energize SU #1 21:31 Start "D" RCP oil pumps 21:33 Started "D" RCP 21:34 LO.cn SU #1 cleared by Pine Bluff 21:40 Pine Bluff attemptir.g to close 125 - Admin. Bldg. on normal lighting Security Diesel secured 21:41 Unit #2 starting 2rd RCP 21: 42 125 closed by Pine 31uff 'l 21:43 X-fring to SU #1 (H1 & H2) )

'fr'd off SU #2' (Al & A2) l 21:52 Unit 92 starting .CP l 21:5S All i~ arters OK j 21:59 31 meitched to SU e2 1 I

22:04 "D" RCP stepped 22:05 Hi-line voltage d::pping 22:11 "0D's cpen v5112 & 5134 22:12 Forca 0 750 0 2205 hrs.

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Shift Technical Advisor Leg Page 3

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! 22:12:30 SU boiler on ' '-

22:17 Eoiler lined'up to reject header .

l 22:27 Unit 2 attempting RCP start ~~~

j 22:29 Main turbine on T. Gear & Lo p eps stopped

! 22:32 Au T Generator lif t ptm.ps stopped i

22:52 "D" RCP started - restart difficult 4 22:53 SU boiler problems .

j 23:06 Stopped P7A -- - -- --

l 23:17 6 '*^:? to system on diesels spck 4 ,

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.# ' STANDING ORDER No. 45 Paga 1 cf 1

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. ATTAC1DIENT A UNIT ONE TRANSIENT DATA COLLECTION r

Collect the following information end assemble in a package:

1. Ccmputer alarm printouts for a sufficient period before end af ter the transient to include all pertinent information.

2. Post Trip Review Printout frca c::; uter (Reactor Trip Inter-

! cepts closed or Generator Output Breakers open).

3. Copy of pertinent pages from the Station Log.

4. Sequence of Events Printcut from coeputer (if available)

5. Any applicable computer group trends v c rt*:.' recordet harts running during transient.

6. Plant Monitor (PM) (Reactor or Turbine Trip).

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NOTE s Retrieving the PM data should be accceplished by the Computer Support Group. Natify one of these persennel within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months after a reacter eqr turbine trip.

RECORDER CHARTS

7. Cut out and remove that portion of the following recorder charts and any other charts containing pertinent data during the transient.

Tape the chart paper together.and label chart paper.left on the re-corder with time, date, reason for removing data and initials. Label the extracted chart paper with rec,crder number or chart description.

, Recorder Number Description -

FR-1022* RCS Loog A Wide Range Pressure PR-1038 - RCS fo'5p-B Narrow Range Pressure TR-1011~ Ma rgid-tg; Sa tura tion -

LR-1000 Pressurizer Level TR-1023 ~ RCS Temperature T TR-1024 NM rN h if G tWicF6RI tr RCS Temperature h FR-2632 Feedwater Flow Loop A FR-2682 '

Feedwater Flow Loop B LR-2659 '

OTSG Level A -- -

LR-2609 OTSG Level B PR-6677*~

PR-2634' (,eMainSteamPressuref bine Header Pres No Number -G 7s Generated Megawatts NIf narrow range recorder stays on range throughout the transient, it is not necessary to ecliect the narrow range chart.

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NOTE: Attach a uritten .arratite centaining all information re;uired in "se :ti:n 2.5 o f the St anding Or.'er. "ake a ccpy fo r the C:ntrol .'.: r: and rcute the original to

.the F1 nt Perf;;1ance 5 :ar;; ce fe r cer cletic . of the i Transicat ? cec rt.

'. .::n ) Sta.-ding Crder '.*c. 43 :ebruary 7, 1930

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.. . Page 1 of 5 ,

UNIT TRRISIE!!T REPORT

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Report No. 2 - 80 -

13 unit year number ..

Date/Ti.me of Transient 4-7-80 / 1847

~ ' '

A.

TRANSIENT DESCRIPTIO'l

~~

ae unit was at approx. 100% power when two 500KV transmission lines vere lost due to wather conditicas. The dispatcher called and asked that the unit drop of f approx. 200 %~E. N During the process of pcwer reduction (approx. 98.0% Power) of f site, pcwer was lost. The Reactor probably tripped on loss of power to the CEDM system. Exact cause of Reactor trip could not be determined due failing to log the alarms and to the SOE's. plant The computer losing 2H1, 2H2, 2A1, 2A2 power busesa@Fr$w lost, therefore, all cen-densate pumps, drain pumps,cire. pu=ps ,RCP's, vacuum pumps, and other non-vital loads were without power.

2oth 2DG #1 and 2 auto started and supplied power to 2A3 and 2A4. "A" &

"3" service water pumps were started. Natural circulation was estab-liched with 2P7A and 2P73 feeding the S/G's. Approximately 15 minutes after Reactor Trip, EI*.JP's 2P7A & 2P7B lost suction (See LER 80-018).

- Loss of ,EWP suction was due to the feed suction flashing. The EWP's

-]-

~

were taking suction fro = the start-up and blowdown ef fluent and the CST's. The SU & SD effluent was what flashed. Operators immediately isolated suction fren 2T94A/B and all suction was taken from the CST's.

1.oss of feed duration was approxiestely 30 seconds. Later 2P7A was turned off to control RCS cooldcwn. Approximately 30 minutes after icss of of fsite power S/U transformer #2-was energized by Unit 2 to

l start "3" cendensate.purp and "A" cire. pump. Af ter being on natural I circulatien for approx. I hour "A" RCP was started. Later the Unit 2 loads were transfetred from S/U #2 to S/U #3. 2P7A was started to feed the S/G's and 1P73 was turned off for the mechanics to inspect pessible problems with the inboard bearing race. Mechanics said there us no problem that wculd af fect the operablility of the pump. 2P7B -;

was returned to operation and 2P7A operation was terminated. Both (l

,' f esel generators were cecured and ""g' RCP was started. L'hile. a t temp t- )

?r r tred By:

/_ -,.ba;,W/ s-Da te: -f/ -R--T(f l t.

? .' 12d Sy: [. i T. I

. ,e ! Date: O 6/M

/

? ic .;er"Or7cr.ce Supervis;r is. . .: (:

D. R s.,: ( .

b *d ' tA.'A ga t .: d l'7 3

w. -%js:s n; engr. ant I'- '

- 23 2 : -

~~~

Oate: ~Y meyr :v;e.es 3 eme-O

. . t.

ids to start the third RCP,undervoltage relays tripped off the operating RCP "B". 'Ihe final plant condition was "A" & "D" RCP running, "B" cen-densate pump running "A" circ. water pump on, "A" & "B" service water

urps running. The next day a decision was made to go to mode 5 oper-ation and repair small problems associated with the RCS. This was at ,

an opportune time due to loss of transmission capability to support , , , ,

100 power operatien.

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. Page 2 of 5 B. I:11TIAL PLA:!T- CD:iDITIO:iS

1) 98 T. FP .

2) 2CV-0302, 0305, 0206 Isolated ---

3) Two 500 KV lir.as inoperable due to weather conditions.

~

l 4) Power ' reduction in progress per request by dispatcher

l (drop off approx. 200 Mwe).

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\

C'. 'GPERATI:iG PERSO:ifiEL 0:1 DUTY SHIFT SUPERVISOR:- Curt Tavine PLA:iT CPERATOR: .lerrv Tatar ASST. PLA:tT C3E?ATCR: co b no ty

'aSTE

. C0:iTROL 0?ERATCR: osndy Hami1+nn AUXILIARY C?ERATCRS: Outch Fned

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.- Page 3 of 5 4

D. IllITIATI!!G EVENT loss of offsite pcwer (100f,'lcad rejection)

~

1 E. SIG!!!GICAllT AUTCt1ATIC C0!4Pdi!EitT STAitT$'/ STOPS

1) all componerits-powered from 2H1; 2H2, 2A1, & 2A2 were stopped, i 2) Diesel generators started (2031~ & 2DG2) 3)-2P7A & 2P78 started

4) "A" &'"B"~ Service water pumps auto started.

s l

l F. SIG::IFICA.*li 1'.A?;UAL ACTIC'iS TAKEN i 1) Stopped 2P7A- - -

,i "B'.' cor.densate ' pump

, 2) Started I

3) Started "A" &'"D" RCPfs. ,

l l', {tirt:-d "A" ';t r:. pu rp.

f) -f 2 :a t.2 3/t -n : -de.h decin. .s:.tica :c Er ;;urps. .

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- Page 4 of 5

( G. S57)E':CE CF SIGtl1FICRIT ACTIC.'iS, EVEllTS -

\'

See Section A and hand written 50E. Also, see Ur.it 1 Transient -

?.eport 1-80-01. .

..r M. .:'AL

PLA!;T CC:QITIONS

. "*" & "D" RCP's running

_?73 en 3" Cce.d. Pump On

, ' Circ. 7; p cn

^5. a ; ar.d Frass normal for iede 3 c;eration

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_.,'o. 5 . . .. + .2 '. i c n .

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Page 5 of 5 r I. P'ROCEDURAL PR03LEMS OR HUMAtl ERRORS

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itone

. a . ;

J. EQUIPMEl4T liALFUtiCTIO:iS computer failed.

Most probable cause was that the computer was being-powered from the alternate AC power source prior to the transient. When offsite ,

potter was _ lost there is not auto xfer to battery power from the alternate AC power source.

( . Loss of suction to 2P7A and 2P73.

K. CCMBII;ED . PLOTS OF PERTit!EllT PRIMARY /SEC0;;0ARY PARAMETERS See attached strip charts. .

ote: The computer printouts were not available due-to less of plant cc puter. A cc-bSad Unit :1 & L' nit 2 hand writtem SOE is attached.

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. STANDING' ORDER No. 45 Paga 1 of 1 -

~ -

. ATTACliMENT B -

. UNIT TWO TRANSIENT DATA COLLECTION r Collect the following information and assemble in a package:

1. Computer alarm printouts fer a Eufficient ' period before and af ter the transient to include all pertinent. informa, tion.

2. Pest Trip Review Printcut frem cceputer (Reactor Trip only).

3. Copy of pertinent pages frem the Station Log.

4. Sequence of E' vents Printout from computer (if available) s.

3 ,

5. Any applicabic computer grcup trends or trend recorder charts .

running during transient. '

~

RECORDER Cita.RTS .

6. Cut out and remove that portion of the following recorder charts and any other charts cer.taining pertinent data during the transient.

Tape the chart paper together and label chart paper left en the re-corder with time, date, ressco for removing data, and initials. Label the ext.racted chart paper with**kbcorder number.

Recorder. Number Description 2PR-4624* ' Pressurizer Pressure Wide Range 2PR-4626 *' '

Pressurizer Pressure Narrow Range 2TR-4615/4715 Margin to Saturation .

- . LR-4628- , Pressuriner Level

.2TR-4615/4715 -

RCS Wide Range Temperature TC 2TR-4614/4714 . , ,' RCS Narrow Range Temperature T H

2FR-1029/1030

2E24A Feedwater/ Steam Flow 2FR-ll29/,1130 . 2E24B Feedwater/ Steam Flow 2LR-1031 SG 2E24A/B Narrow Range Level 2LR-1079* SG 2E24A/B Vide Range Level 2PR-0200* -

, Main Steam Pressure to FP Turbine' 2IR-9624 Net & Gross Geh.erated Megawatts 2PR-1041- SG2E24A/B Pressure kIf narrow range _ rec' order stays on range throughout the transient, it is not'necessary to collect the narrow range chart.

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