ML20141H480
| ML20141H480 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 07/18/1997 |
| From: | Hall J NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9707230236 | |
| Download: ML20141H480 (4) | |
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1 July 18,1997 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 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 i
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 objection to the placement of this information in the PDR.
Attach'ments: as stated cc:
J. Roe J. Clifford J. Calvo T. Hiltz E. Collins PDR bcc k t FiIc DFD('
I 9707230236 970718 PDR ADOCK 05000298 S
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} P1 k To] n.sr h = =./ l Pnek sr n. h e. M' yOR INTRA DISTRICF! NOTED jut. 1 0 1997 ashjeet _ rim. sn'.n t. seem= : = BUSINESS ONLY i Pt POPE t 4 During the evening of Anac 10th and early anondag bouts of J -40 ;-d sono estruene nah SPP regions.11se MAPP e==didaa= affecting under tie une 11th the MAPP { nucleargeneratson ofHinsin levels were now and power Sowsinto the o 1* - =+, ofparticolar laterest were . The SPP region also had samewas a significant maw = na ao ma9 t of low cost MAPP generation, there were high h expo. Dualto the condition and andIslan units off due i seidenths During.the taas afternoon ofJune 10th
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had reached a limit. The King - Ben, t i 345 kV tie line flow' teached 945 MW w achadah in preparation ihr LineClabe bus voltage of 340 kV. Due to the i act called for as the King - Eau Claire Ratief(LIJL).. eaadifiaan NSP caued ibe MAPP H were reported, but LLR was t the tie line loading dropped to around 350 1 due to the'sobedule collection alona. A PM. seleasedslu \\ t IIR sequest at around 7:30 i ) As the e i Cooper y'esdaq progatened, sie line Sows across the Coop i St. Joe 345 kV) aaarh=nad to inesease. NPPD moottored the e and eventually -=caad=d he 1100 MW operating thnit. t t l to verify the 1124 MW Cooper South flow and inquire # 10:20PM, NPPD contac ow as k . OPPD hwfwaaa that.they were to rednoe to what was planand flor. i South flow conrianad to rise the Nebraska City plant. i kV PM had dacuaad o 338 kV, 11:00 PM. Also, the Bau Claire 345 t NSP to callibe achadataa at 11:15 PM. A reported to MAPP that i Cooper South Sow was at 1280 MW and they called ~ P LLR achedules i around 1300 MW over. No MAPP Lt.R was involead and the Cooper saidnight when OPPD finally caued for MAPP LIJLthe next half hour. Th i l at Stsortly after =Lealght the Arpin *
- ~n' kVline a secaose and sosse espacher Run 345 kV tina tri pathinto due to overloads. Ag protdems at Ben Cla#pped due to a relay e the Bau Claire -
345 inwiis .a.sy 6 ndmates sJter a,sidnight, the critical sesult of tids and the neglo acadit*cas wasid not allow a { 884 MW. This the Cooper Sow to 1554 MW and she Cooper recicours.St. Joe now in stas 800 MVA CT's and associated naseming; at St. Joe and triggered overtoed stanns at NPPD's Cooper =ha'=rian Iowa area prosapsed MBC to bring on = Also, low la eastern Schedule casts eaa+8==>ad to reduce the Cooper So 1 r^*= tartenes far voltags support. cuts Claire - Arpin 345 kV 11ao was rearrned to service aho y 1:00 AM. Cooper South Dows to levels where 1.LR ocold be emane*stl after 2J00 AM w y :30 . The P4u Systeen a. 1 case was de this *: --+ to evahanno systent seoerity during tids C peak case and ' -s ibr the region. A loednow a 50% ana=aae generation outanes =ehadat conditions 41 cd. att truaasaiasion and The base ca,se =db MW of incremmensat osasfers wer.. In order to ad e =ad aad frass Ms the akradtaneous transfer Bau Claire - Arpin 345 kV liac was autaged wtuch resuhed in 15 l mined ames Doniphan. The-1 W ) on Cooper Saudi sad the { h i; t i l l { e 1 k ,l l t t ~.
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i, I l. i j Cooper-St. Joe 345 kV Line now was 382 MW widch closely folkrwed the recorded values. Also at this point. the loadnow ladiosted annerew overloads on 345 kV and 161 kV ties between 4 i i MAPP and MAIN /SPP. The mudor concen". macrounded the posential 900 MW trip s 8 associated with the Cooper - St. Joe Iles. The on tEs Cooper-St. Joe 345 kVline j are set such char km emness of MW will the charasseristics and j operation is depeed1 t on ska VAR Sows on the lias. 884 MW secorded Sow 4 was so close, a powerfkm was run to evakaase the kapaces ofloss of abs Cooper - St. Jos 345 k 4
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i 'nis soeuks of that =t==in=*ta= wene sydse s.nntnir. Every - 345 kV and 161 kV tie into g SRP and MAIN was overtoeded to levels which would have in setsy on those l h211*Ima. Of pardcolar laserest was the 1225 MW on the Cooper + Patrport could trip for Sows azoseding 800 MW. Just which tis lina wassid Itava tripped line which I is abs only r = =1aint but ths reality is that we doenkely would have tea thp MAPP ] away Deat i SPF and MAIN reglass. Pollowing the t5e time regiserwould seneradon tripping one to overeegmenny and even ' =.-- -- need as the inlandad synessa aarenamad si a new, point. Iy' ^ in the and SPP asons also would have occurred. islassis wouial have a. loa'd abedding c- =- ^i point are not W imown, but the process would mirror a smaller scale of ths klaht=xisted at that l ' which cosaured in the Western UJ. last suunner. ) 1 I 'nde event abound not be iBod awaq as just anadwe cices call. We need to secognias just how close we were to collapsing portions or the Baseern Insesconnection and a4ust {. precdees to avoid ssoccorsomme. There are real 1kaks as the transfler guides and out of the i e and those Ibnits see ' "=-" 1 This eventis an a4radagreps'im of how the regionat icensecanecaed sysemi is being operased at and sven beyond k's capabilities. k Q),b I. **: i 'I ) i I ' seress topme,siesum esys atmuseens c.N) N i { i I i a . l.. l t s l i / 1' 4 f i i I i k I 2 i ? } l ro m. p.e4 i l' i i I ,.,,. -...}}