ML20141H413

Forwards NPPD Problem Identification Rept & Related Internal Memo Re 970610 Grid Disturbance.Memo Documents Staff Actions Taken & Planned & to Make Subj Info Publicly Available

ML20141H413
Person / Time
Site:	Cooper
Issue date:	07/18/1997
From:	Hall J NRC
To:	NRC (Affiliation Not Assigned)
References
NUDOCS 9707230147
Download: ML20141H413 (4)

Text

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., g j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20666-0001 o

July 18,1997 -

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NOTE TO: PD IV-1 Reading Files FROM: James R. Hall, Senior Project Manager *

SUBJECT:

JUNE 10-11,1997 GRID DISTURBA E - NEBRASKA PUBLIC POWER DISTRICT MEMORANDUM OF JULY 8,1997 On July 14,1997, Region IV provided to me for information the attached Nebraska j Public Power District (NPPD) Problem Identification Report and related internal memorandum regarding a June 10 grid disturbance. Upon review and discussion of the information, I provided copies of the internal memorandum to Tom Hiltz of the EDO's office and Jose Calvo of the Electrical Engineering Branch (EELB) in NRR.

I also discussed the event with Mary Wegner of AEOD, who indicated that she had "

a copy of the information. It is my current understanding that the Department of Energy will visit the area next week and assess the grid conditions and practices in the area of the MAPP, and that EELB will review that information, when available.

This note serves to document the staff actions taken and planned, and to make the subject information publicly available. NPPD was notified and expressed no 1 objection to the placement of this information in the PDR. l l

Attachments: as stated J i

cc: J. Roe

J. Clifford J. Calvo T. Hiltz  !

E. Collins i PDR l

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' the evening ofe=adhiaan some extreme SPP regions. The MAPP JuneafBeedag106 mejor andtic early morning hours of~ Ju \ \

power flows into the i emclear seneration off4ine in te levels were low and was a significant saw=*ae

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to maintananr*, of particular interest were . The SPP togion had some of low cost s MAPP generation, there were high and Istan. amthe unks offdue

' export 181o es condition and Dudag.thelate aSansoon ofJune 10th ..a.n..d SPP ses: ens.

had reached a link. The King - Bau, mJ.e-- acanes a cdskal,hnnn-re. - Winanne I Claire bus erhawklen voltageibe in properation of Line 340 kV. Due to the heavy 345 kV tio line flow' teached ' 945 i not called for as stu, King - Eau Claire Ratief(LLR). condi$ons, nla NSP caHed ibe MAPP t

PM.the tie line loading dropped so around 850 were toported, but LIJL was t

releaseddue to the schedule collacsion IJJL request at around 7:30  :

! As the ev i Cooper ening progressed,

=.da t sie line Sows across the eCooper i Soo i

St. Joe 345 kV) eaad=d o inszesse. south NPPD flow as k mankrw i

GPPD. OPIED to vertfV indlested the 1124 est they wem MW Cooper South flow NPPD and inquire ps to e-maedad as planned fbe .

kV South now coarlanai to rise PM OPPD reported to MAPP thattages to reduce had daciinad generation to 338 kV, at the Nobreska i MAIP IJ.JL sebedules Cooper NSP South to flow call wasfbr achadates at 1280 MWatand 11:15 they PM.

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caned Atfo j around 1300 MW theover.next halfNo MAPP hour. 'Ibe. Coo 11R was involoed and the Cooper S i

midalght  ! when OPPD Ennity called ibr MAPP IlJt. per South iky increased to 1347 ,

kV11ac after " *e the Arpin - Rocky Run 345 kV line tripped due to a r paminto a sueloes and some capacker bank problems at Bau Ciglie, the Bau C due to overloads. At -

wie and me maaly 6 mineens after saidnight, time crideal in 345 roomk of this the Cooper liv 884 MW. This Sow to 1554 Mansle in the 800 MVA C1"s and ===~-8=*=* W and

~=dhiaa* woeld Cooper St. Joe Bow to not anow and triggered overtoed alarins at NPPD's Cooper substatlen.

Iowa ares prosapeed MEC to bring on a~C- --g enabines _ laibe eastern voka,e Also jlow vo were imede

• • hadata outs conti-wdaeroes the half hour and the Cooper support.

Soo& Sow cuts was sedac 1:00 AM.

Cooper South toSowsI reduce the Cooper South flow to 1054 MW by 1:30 to levels where "

+1 IJJL could d wideh reduced the be

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B&u-Claire - A Systeen case was de sneeration *=**- =ehad=1 tidsa disturbance 505 ====ae peak to case evaluase and * =-system security the .

the region A l oedflow du =~ ;d. all tr=nemissian and

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The base e,sse ynanehai quite well with SCADA tie line truasfers were snodeled fross IW

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Emu Claire - Arpin 345 I kV line was entaged widch ':.e4 toma assuhed W on Cooper South and the Doniphan The- in 1527 M

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at - Sr. Joe M5 kV lies now was 382 MW widch closely i

the recorded values. Also  ;

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=-law widt the and Cooper- MAIN St. Joe /SPP. Ems, The mudor conocra marrounded the p 8

are set such that on tip Cooper-St. Joe 345 kVline j operation is in amassa of MW .upon the charneseristics and was so close, a on sba VAR flows on the lias. 8 o the 884 MW recorded Sow line.~ was run to evalusse the impaces ofloss of abs Cooper - St. Joe 345 kV Tbs results of that al-Ma wens alanning. Every a d 161 kV tio lato SRP and MAIN 345 kV a' j iheJHelas; Of was overtonded to widch would have in setsy on those

, could trip inserest was the 1225 MW on the Cooper + Patrport line widch  !

} amoeeding 800 MW. Just widch tin line would Itave first is abs only

-inh 4 tnat the is that we danatta would have away Ocot SPP and MAIN bjAPP Pollowin llan would artyptes des en we g the r ana as islanded systna aardnM to a ask 3y%n=^even =A-e--- - = load in the -

-i isla51: wouklhave e.lced Ming j and SPP areas also would have ocentred.

1 point are not -hlly known, but the process would mirror a 4:naller scale of thsxisted at that kl=eh==*=

i ' which occurred in the Westesu U.S. last aanmer, t

i 'Dds event abound not be iDed away as just annehme close call. We to recogniaajustinw close i .

we were to collapsing portions of the Basesen Intesconnecdos e@ast and

to avoid recoeurrence. There are real llades to thh tre

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out of the and those ihniss are " ^ - - - - ' 2 This eventis an ~ l l ihe regional interconaaenad sysensi is being opwated at and vea ofhow '

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