ML20141H413
| 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
d6CKET PtW f* "%,k UNITED STATES g
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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 Attachments: as stated J
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J. Roe J. Clifford J. Calvo T. Hiltz E. Collins i
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PI POPE Dur
' the evening of June 106 and early morning hours of Ju
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SPP regions. The MAPP e=adhiaan afBeedag mejor tic emclear seneration off4ine in te levels were low and power flows into the i
was a significant saw=*ae to maintananr*, of particular interest were
. The SPP togion had some
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of low cost MAPP generation, there were high unks offdue and Istan.
amthe export 181o es condition and s
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 Claire bus voltage of 340 kV. Due to the heavy 345 kV tio line flow' teached 945 erhawklen in properation ibe Line I
i not called for as stu, King - Eau Claire Ratief(LLR).
condi$ons, NSP caHed ibe MAPP nla were toported, but LIJL was t
PM.the tie line loading dropped so around 850 releaseddue to the schedule collacsion t
IJJL request at around 7:30 As the ev i
Cooper ening progressed, sie line Sows across the Cooper Soo St. Joe 345 kV) eaad=d o inszesse. NPPD mankrw i
t
=.da i
e GPPD to vertfV the 1124 MW Cooper South flow and inquire ps to south flow as k NPPD e-maedad
. OPIED indlested est they wem i
kV South now coarlanai to rise as planned fbe.
to reduce generation at the Nobreska PM OPPD reported to MAPP thattages had daciinad to 338 kV, NSP to call fbr achadates at 11:15 PM. At MAIP IJ.JL sebedules i
Cooper South flow was at 1280 MW and they caned fo
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around 1300 MW over. No MAPP 11R was involoed and the Cooper S j
the next half hour. 'Ibe. Coo midalght when OPPD Ennity called ibr MAPP IlJt. per South iky increased to 1347 i
after " *e the Arpin - Rocky Run 345 kV line tripped due to a r a sueloes and some capacker bank problems at Bau Ciglie, the Bau C kV11ac due to overloads. At paminto maaly 6 mineens after saidnight, time crideal in 345 wie and me roomk of this Sow to 1554 Mansle ~=dhiaa* woeld not anow liv 884 MW. This the Cooper in the 800 MVA C1"s and===~-8=*=* W and Cooper St. Joe Bow to and triggered overtoed alarins at NPPD's Cooper substatlen. Also low vo j
Iowa ares prosapeed MEC to bring on a~C- -- enabines ibe voka,e were imede aeroes the half hour and the Cooper Soo& Sow was sedac la eastern
- hadata outs conti-wd g support.
cuts to reduce the Cooper South flow to 1054 MW by 1:30 Cooper South Sows to levels where IJJL could be ~ -Claire - A 1:00 AM.
. The B&u Systeen
+1 d wideh reduced the I
tids disturbance to evaluase system security the the region A l case was de a 505====ae peak case and * =-
oedflow sneeration *=**-
=ehad=1 du The base e,sse ynanehai quite well with SCADA tie line
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==*=1 truasfers were snodeled fross IW
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Emu Claire - Arpin 345 kV line was entaged widch assuhed in 1527 M
':.e4 toma Doniphan The-I W
l on Cooper South and the
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- Sr. Joe M5 kV lies now was 382 MW widch closely the recorded values. Also i
at MAPP and MAIN /SPP. The mudor conocra marrounded the p i
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=-law widt the Cooper-St. Joe Ems, on tip Cooper-St. Joe 345 kVline are set such that in amassa of MW j
operation is
.upon the charneseristics and on sba VAR flows on the lias. 8 o the 884 MW recorded Sow was so close, a line.~
was run to evalusse the impaces ofloss of abs Cooper - St. Joe 345 kV Tbs results of that al-Ma wens alanning. Every 345 kV a' d 161 kV tio lato j
SRP and MAIN was overtonded to widch would have in setsy on those a
iheJHelas; Of inserest was the 1225 MW on the Cooper + Patrport line widch
, could trip amoeeding 800 MW. Just widch tin line would Itave first is abs only
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-inh 4 tnat the is that we danatta would have bjAPP away Ocot SPP and MAIN Pollowin llan would artyptes des en we g ther ana 3y%n=^even =A-e---- = load islanded systna aardnM to a ask as isla51: wouklhave e.lced Ming in the
-i and SPP areas also would have ocentred.
j point are not -hlly known, but the process would mirror a 4:naller scale of ths kl=eh==*=
xisted at that 1
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' which occurred in the Westesu U.S. last aanmer, t
'Dds event abound not be iDed away as just annehme close call. We to recogniaajustinw close i
i we were to collapsing portions of the Basesen Intesconnecdos e@ast and to avoid recoeurrence. There are real llades to thh tre out of the l
and those ihniss are " ^
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' 2 This eventis an ~
ofhow l
ihe regional interconaaenad sysensi is being opwated at and vea k's capabilitice.
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