ML17339A575

Sys Disturbance,Loss of Generation at Facility,790404

ML17339A575
Person / Time
Site:	Turkey Point
Issue date:	05/08/1979
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17207A819	List: 05000250/LER-1978-017, Forwards LER 78-017/03L-0 05000250/LER-1978-017-03, /03L-0:on 780514,improper Switching at Pratt & Whitney Substation & Incorrect Wiring of Protective Relays at Midway Substation Led to de-energization.Offsite Power Lost.Incorrect Wiring Corrected L-78-226, Forwards Response to NRC 780607 Request for Proposed Methods & Procedures to Implement NRC Positions Re Sys Operations. Util to DOE Encl ML17207A818 ML17339A562 ML17339A563 ML17339A565 ML17339A569 ML17339A570 ML17339A571 ML17339A575 ML17339A577 ML17339A580
References
NUDOCS 8002150501
Download: ML17339A575 (33)

Text

P.O. c,OX 5291Cll i.'lAl1 I, PL% 33152 Reference 15 FLOlllOA PO"J=R 2 UGrlT Co.'s'.?A'lY

&lay 22, 1979 United States Department of Energy Division of Power Supply 5 Reliability

- Office of. Utility Systems Economic Regulatory Administration Nashington, D.C.

20461 Gentlemen:

Attached is a copy of the disturbance analysis report. for the po(~er inte'rruption which occurr'ed on the Florida Power g Light system at ll:S7 p.m.

on April 4, 1979.

Further analyses of this disturbance are being done by the Florida Electric Coordinating Group - Operating Committee.

The findings of their study will be furnished when completed.

Sincerely,

~c /iZ N. E.

Coe Director - Power Supply b'EC/ayg Attachment.

CC:

Florida Public Service Commission

- J.

D. Jenl-ins SERC

- Grady L. Smith Florida Electric Coordinating Group - N. D.

Lang bcc:

E.

E.

G.

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R.

G C.

A. Adomat L. Bivans E. Liebler N. Paduano D. Schmidt E. Uhrig D. Nhittier~

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Noody 800S150SQ J

PEo?Le

~.. SeRVliMG PeoPLE

4/25/79 Rev. 5/8/79 FLORIDA POMER 6

LIGHT COMPANY SYSTEM DISTURBANCE LOSS OF GENERATION AT TURKEY POINT

>IfONES DAYp APR I L 4~

1979 11:57 PH

'4 TABLE OF CON ENTS PRE" D I STURBAllCE COND ITIONS D I STURBANCE

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.... 2,3,4 SYSTEM RESPONSE

SUMMARY

FPL GENERATING UNIT GOVERNOR

RESPONSE

TIE LINE RESPONSE CHARTS 8 DIAGRAMS

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TURKEY POINI TRANSMISSION LINE TRIPPING SEQUENCE SYSTEM FREQUENCY FROM RANCH OSCILLOGRAPH SYSTEM FREQUENCY AT PORT EVERGLADES FPL SYSTEl'I LOAD

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FPL GE NERAT I ON

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FPL NET INTERCHANGE SOUTHERN COMPANY NET I NTERCHANGE UNDERFREQUENCY LOAD SHEDDING AREAS 0 ~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~

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iITC/DRH:dop 4/2l/79 Rev. 5/8/79 lJ~BA~CE COhl01T'1 ONS'"-

During the afternoon and evening of Mednesday, April 4,

1979, the II Florida Power,E Light transmission system was experiencing widespread incidents of flashovers resulting in the tripping of major 230 kV transmission lines in its Southern service area.

The flashovers were caused by the combination of an accumulation of salt and dust on in-h

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'ulators caused by a period of extremely dry weather and strong winds, fol lowed by an increase in the humidity level.

By 1l:53 P.H. four of seven transmission lines leaving Florida Power and Light's Turkey Point plant were out of service as shown by the system configuration diagram and sequence of events chart on page 8.

These were the Turkey Point-Davis //1 230 kV 1 ine, the Turkey Point-Davis fr'3 230 kV line~ the Turkey Point-Flagami Pr1 230 kV line, and the Turkey Point-Dade dl 230 kV line.

The three remaining transmission circuits out of Turkey Point Plant had a combined thermal capacity of 1621 llVA.

Prior to the disturbance Florida Power 6 Light's load was 3870 Vive and the net interchange was 150 Hw, out of, FPGL.

The system frequency was 60.03 Hertz.

FPL was carrying approximately 492 t'iw of spinning reserve

-~

while its requirement was 331 Hw.

Furthermore, there were an additional 491

>tw of on-1 ine steam available and 1778 Hw of quick start gas turbines which could be made available within 30 minutes.

At the time of the dis-turbance Florida Power Corporation was importing 200 than of power from Southern Company.

>'pinning Reserve as defined by the Florida Coordinating Group.

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'hW Between 11:53 and 11:57 P.H. the remaining three transmission lines out oF Turkey Point plant tripped, and isolated Turkey Point from the rest of the system.

At the time the I ines tripped, three Turkey Point units were on:

Turkey Point Unit 1 was carrying 352 IIw net, Turkey Point Unit 2 was carrying 181 Iw net, and Turkey Point Unit 4 was carry-ing 600 IIw net.

With the loss of the transmission lines, Turkey Point Unit 4's instruments.detected the loss of connected

load, and ran the unit back.

Immediately after, the unit tripped on a low stcam generator Ievel trip signal.

Simultaneously, Turkey Point Unit 2 was tripped by its anti-motoring protection, and Turkey Point Unit 1 reduced its gener-ation but remained on-line carrying the plant auxiliary u es.

The

'esultant combined generation loss within FPL was 1133 t<w.

When the Turkey Point generation was lost, the power flow into Pen-insular Florida increased.

Th'is power surge caused Florida Power Corporation's Archer-Ft. White 230 kV line and Ft. White-High Springs I

69 kV line to trip, isolating Peninsular Florida from the cxtcrnal systems.

At the time of separation FPC's interchange with. Southern Company changed from 200 ILv (IN) to 20 l<w into Florida indicating the creation of an additional loss of 180 Nw within the isolated region.

Thus, the loss of this import from Southern Company coupled with the loss of Turkey Point generation resulted in a total deficiency of 1313 Yiw within Peninsular Florida.

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'The resu I t ing: mismatch';of

'. load'~and';gene'ration.-'caused.".-th';

f'requency.'o decl ine.

Llithin FPL the system frequency decl ined to a lou of 59.01 Hz, and initiated underfrequency relays which shed approximately 470 H~ of load in the areas shown below.

Governor response and load shedding within Peninsular Florida stabi1 ized the frequency at 59.85 Hertz within 10 seconds.

FPL LOAD SHED BY UNDERFRE UENCY REL'AYS Division Load Southern Northern Eastern Mestern TOTAI 240 95 66

~6 470 in addition, other utilities within Peninsular Florida shed.the following amounts of load:

Utility Step

'0'59.7 Hz)

Step

'l'59.2-59.0 Hz)

Total

., FPC TECO OUC JEA TOTAL 150 70 0

0 220 Nw 76 60 5

~0 231 Hw 226 130 5

~0 453.

Hw FPL generating units responded by providing 173 Hw (see Governor Pesponse

Table, page 6 ), while the

'FPL tie 1 ines with other utilities provided an additional 491 Hw (see Tie Line Response, page 7 ).The generating unit and tie line response, coupled with the reduction in load, made up the entire loss of Turkey Point generation.

A summary of the response of the FPL system is shown on page 5.

Prior to the reestabl ishment o'f the" ties with the external systems~

FPL's net interchange was 3lO Hw (IH) and the frequency had recovcrcd to 59.92 Hertz as a result of an increase in generator output.

Florida Power Corporation's transmission ties with the external system were'reestablished approximately two minutes after the start of the disturbance, at which time load restoration was initiated by other affected systems.

Once this was completed, FPCL proceeded to restore its own load.

Host of the FPL load was picked up within 20 minutes after the disturbance originated.

The FPL net interchange returned to its prodisturbance level ll minutes after the origination of the disturbance.

At 1:02 AH a transmission line was closed in to tie the Turkey Point 230 kV buss to the network, but it separated at 1:05 AH.

At 1: 27 AH the buss was once again synchronized to the network, but the line tripped at 2:12 AH.

Finally, at 6:11 AH a third and successful attempt was made to tie Turkey Poiht to the network permanently.

A second transmission l.ine was successfully closed in at 7:23 AH.

Turkey Point Unit 2 was brought back on-. line at 7:43 AM on April 5th a'fter these two transmission circuits had been. restored.

The remaining transmission circui.s were subsequently restored.

Turkey Point Unit 4 was intentionally left off-line, as it was scheduled to come off for refueling after the system peak of April 5th.

FLORIDA POWER AHD LIGHT DISTURBAHCE RESPOHSE

SUMMARY

FPL SYSTEM DISTURBANCE RESPONSE DATA SHEET Disturbance LOSS OF TUPKEY POINT UNITS Cause TRANSMISS ION LINE OUTAGES Date 4/4/79 Date 4/16/79 Time

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F Gl 4020 Mw~

G2 150 OUT Mw, NI2 Hz, 341 IH Mw, Q F hl5 HXP Fl+

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$ L 470 I"tw I oss" (Load +,

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Response(DNI

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"- Generation Loss 1133 I+t; Load Loss

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FPL GCIIERATIIIG UNIT GOVC R tiOR RES POIIS E Date 4/16/.

Pi epared By D.A. t'<clnnis UN IT TURKEY POINT 1 TURKEY POINT 2

TURKEY POINT 3 TURKCY POIWT 4 ACTUAL CEN CONTI NUOUS,,.

BEFORE EST I HATED

~ CARACgTY..:.." D ISTURBANCE, =, /~VALVE, 3 9 352 95 185

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'ORT EVERGLADES 3 PORT EVERGLADES 4 PORT EVERGLADES GT LAUDERDALE 4 LAUDERDALE 5 LAUDERDALE GT R I V I ERA 1 RIVIERA 2 RIVIERA 3 P.IVIERA 4 190 205 369 150 OFF 138

. 138 OFF OFF OFF 273 OFF 391'80 OFF OFF 207 OFF 99 89 77 26 OFF 14 OFF3 OFF

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LUCIE 1 OFF OFF OFF OFF FT.

tIYERS 1 FT.

IIYERS 2 FT.

AYERS GT FIAt]ATEE 1 HANATEE 2 CAPE CANAVERAL 1 CAPE CANAVERAL 2 138 369 OFF OFF 772 369 OFF 112 345

~ OFF OFF 370 345 OFF 81 93 48 93 7

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OFF 38 18 OFF 10 22 OFF OFF 30 25 OFF SANFORD 3 SANFORD 4 SANFORD 5 PUTNAH 1 PljTHAH 2 OFF OFF 364 230 364 250 OFF OFF OFF

'FF 63 69 OFF 18 18 OFF OFF OFF 15 10 OFF OFF TOTALS Notes:

175 3No. of units on line X (37-28) if (F1 +) 459.9 Flz.

4No. of units on line X (57-40) if (F1 +).(59..9 Hz.;

No. of units on 1 ine X (23.5 X Hz) if (F1 +)759-7 Hz-5Actual Continuous Capacity r

Generation for Pt. Everglades Unit I and 2 are combined into a single value.

Generation for't. Everglades units 3 and 4 are combined into a single value.

6 5003 4020 173 1Actual Gen/Continuous Capacity (Before Disturbance) 2The smaller of a)

Continuous capacity X. I67 X

HZ/.5 (tiax Hz to be used =.5 or

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TIE LlNE RESPONSE Disturbance LOSS OF TURKEY POINT UNITS Prepared By O.A. Mclnnlaoare

((/16/79 Date

</</79 Time 11 57 TIE FLOW BEFORE DISTURBANCE FLOW AFTER SUBTOTAL CHAMGE SUBTOTAL OlSTURBAMGE B lg Bend"Rl ngl lng 230kV Big Bend-Nanatee 230kV 70 IH 38 OUT 32 IN 190 I H 258 IH 290 IN

'00 IH 53%

"( '6 J ~ J L

rc Sanford-Turner U.5kV North Longwood-Sanford 230kV Brevard-West Lake Wales 230kV Indian River-Cape Canaveral 230kV 12 IH 80 OUT 10 OUT 90 IN 12 IN

.93 IH 105 IN 190/

8 IH I15 OUT 50 IN 162 IH Grccnl and-Putnam 230kV Baldwin-Normandy 115kV Duval-Normandy 230kV 125 OUT OUT 40 OUT 170 OUT 133 IN 27/o 37 OUT 50 OUT 8IH 5

IH

>'< New Smyrna Beach 115kV

. Vero Beach 138kV Ft, Pierce 138kV Lake Worth 138kV Homestead 138kV 13 OUT 18 OUT 6

OUT 0

37 OUT 7

IN 1%

13 OUT 30 OUT 14 OUT 3

OUT 0

TOTAL 163 OUT 100%

328 IH i'Discrepancy between net interchange total and sum of Individual ties due to Hew Smyrna Beach not included in total.

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7000 FPL System Generation Wednesday, April 4, 1979 6000 5000 4000 LOSS OF TURKEY POi g GENERAT i ON 3000 2000 llPM

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