View source for IA-85-353, Summary of 840223 Meeting W/Util Re Spirit Lake Blockage & Flooding Potential.List of Attendees & Viewgraphs Encl

{{Adams
| number = ML20134A516
| issue date = 07/15/1985
| title = Summary of 840223 Meeting W/Util Re Spirit Lake Blockage & Flooding Potential.List of Attendees & Viewgraphs Encl
| author name = Trammell C
| author affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| addressee name = 
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000344
| license number = 
| contact person = 
| case reference number = FOIA-85-353
| document report number = NUDOCS 8508150331
| package number = ML20132B592
| document type = MEETING MINUTES &amp; NOTES--CORRESPONDENCE, MEETING SUMMARIES-INTERNAL (NON-TRANSCRIPT)
| page count = 14
}}

=Text=
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o                         UNITED STATES g
y s,        g              NUCLEAR REGULATORY COMMISSION
:; (           .., l                      WASHINGTON, D. C. 20555
    #'+, '\      ['                                                                       g/hv i
         *....                                                                              u Docket flo. 50-344 LICENSEE: PORTLAND GENERAL ELECTRIC COMPANY (PGE)
FACILITY: Trojan Nuclear Plant Sil8.1ECT:     

==SUMMARY==
OF MEETING HELD ON FEPRUARY 23, 1984 RE: SPIRIT LAKE BLOCKAGE AND FLOODING POTENTIAL AT TROJAN On February 23, 1984, the NRC staff and consultant met with representatives of Portland General Electric Co. (PGE) and its consultant to discuss the flood potential at Trojan of a postulated breakout of Spirit Lake on Mount St. Helens. A list of attendees is attached. Highlights of the neetino are sumari:ed below. Copies of viewgraphs shown at the meeting are also attached.
Both PGE's consultant, Simons, Li & Associates (SLA) and USCS have esten?ted the possible ficod elevations in the Columbia River at Trojan due to 'a41ure of the debris dam blocking Spirit Lake. The highest level estimated by SLA was el. 39 feet. The Trojan plant grade elevation is 45 feet. The USGS estimates shcwed flood elevations above grade for high Columbia River ficws (50 and 100-yr. peaks). It Oso showed floeding for modest river flcws after a breakcut due to the sedimen deposit in the Columbia River.
The purpose of the meeting was for each party (SLA and USGS) to present its analysis and methods and to identify differences, conservatisns, realisms, etc. to determine if further analysis is needed.
A major difference between the two analvses was the amount of sedinent decosited in the Columbia at the mouth of the Cowlitz. SLA assumed an initial sediment volume of 65%, dropping to 45%, with 50% wash load. USGS used 655 all the way to the Columbia. Maxinum deposit in the Columbia was .?.8 billion cubic yards (SLAl versus .5 billion cubic yards (USGSI.                                                          i
                                                                                                                 \
USGS is currently develeping a more refined sediment transport routina redel to studv the impacts of a Soirit Lake breakout on the Columbia River. Thfs study is beina conducted for FEMA. It is excected to orovide initial results by abcut Pav 1, 1984      The results should be core realistic than the curren* '' rec estfrates, and therefore will prebably show lower 'lood elevations.                                  ;
M/. I Charles M. Trarrell. Pro.iect Manecer Operating Peactors 3rarch 23 Division o# licensing Attachrents                                                                                        a
: 1.       Attendence List
: 2.       Vincraphs 8508150331 850715 PDR   FOIA BELL 85-353       PDR
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UNITED STATES 4                 o                   NUCLEAR REGULATORY COMMISSION
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                           .                               WASHINGTON, D. C. 20555
               %, .....f Docket No. 50-344 LICENSEE: PORTLAND GENERAL ELECTRIC COMPANY (PGE)
FACILITY: Trojan Nuclear Plant SIIB 1ECT:        SUtiMARY OF MEETING HELD ON FEBRUARY 23, 1984 RE: SPIRIT LAKE BLOCKAGE AND FLOODING POTENTIAL AT TROJAN                                   .,
On February 23, 1984, the NRC staff and consultant ret with r'epresentatives of Portland General Electric Co. (PGE) and its consultant to discuss the flood potential at Trn,f an of a postulated breakout of Spirit L;ke on Mount St. Helens. A list of attendees is attached. Highlights of the meetina are surrarized below. Copies of viewgrachs shown at the meeting are also attached.
Both PGE's consultant, Simons, Li & Associates (SLA) and USGS have estimated Me nossible flood elevatinns in the Colurbia 04ver at Troja" due to failure
                  "       -a de.ri; c r hinrking Sciri '. A c .           ~5e hi "es- levei es*' =d 'y Fi.:
was el. 39 feet. The Trojan clart grace elevation is 45 fee *..                    *5e t'SGS e s -i ra t e e, shrwed #1ond ?ievations above crar's 'or hich Colu-bia D4 ve" #lews (50 and 100-yr. peaks). T* rte U$65 also estimab] RJ if Spin Ld'c_ as ,
to bratfed duriwi a feriod of [4w C=hwb'u Ou'<AOtes Suck KM a asassive swud J 542inu d is                               6 CNerf a Subseyewt & meded rWer fhr U.-y pead .:pesifel 6 de Colund::u!J cause .fbding etf -de Troja P The purpose of the meeting was for each party (SLA and USGS) to present its analysis and nethods and to identify differences, conservatisns, realisms, etc. to determine if further analysis is needed.
                  %e                                                           aAe. a$5cMed
                  % maior difference $ between the two analyses ** thegamountsof sedicent deocsited in the Columbia at the mouth of the Cowlit:: ad b gut kSaws et 64 wuMfcuf5.
SLA esawJ s.d a pat. ecu.r     x.%2F        o.2 bikc2eic.
i 3%%asanZ       cohG.4ee?gaa eeuu          be %
cer seud. Jecesitel      ti se 6tadiet. G otCxS assawd o CelawbLt bem deposit af 6.50 billim. cubid gud 3 aul a [est' A/4tJ d t.1 d!!ieta c.ubie. feeE per secrui.
Fre.Maatu ce.statt &
USGS is currently developing a more refined semrent transport routina nodei to s*udy the iroacts o# a Scirit Lake heeakout on the Colurbia River. This study is hainc conduc*ec for FEMA. h excected v                        ~-   - ' ' - ' ' = = ' = by abou-ftav       1, 1984. y e C t; a : t ~~ ~ ~ ''' '- 7' ~ r mM '' cc6 cc '--; a , m n %rwH pr-Whe@c_ibu4nums.
M/. I tt Charles M. Trarrell. Project Manacer Gnarati"g Reactors ?rarch #3 Division of Licensing Attachrents            .
: 1.       Attendence List
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As shown on Figure 1, the blast and resultant mud and pyroclastic flows from the mountain's north side impacted the river basins of the Toutle, Cowlit: and Columbia rivers. It is estimated that approximately three billion cubic yards of material settled in the upper 14 miles of the north fort of the Toutle River, with a much smaller but still staggering 60 million cubic yards settling in the upper reaches of the south f ork of the Toutle River. Mudflows in the following 24 hours, buoyed by melting mountain ice and waters displaced from upper Toutle River channels, carried more than 50 sillion cubic yards of =aterial into 21 miles of the Cowlit: River f rom the soutn of the Toutle downstream, and deposited an additional 45 sillion cubic yards in the Columbia River, upstream and downstreas of the mouth of the Cowlit: River near Longview. Those flows and volumes occurred in less than a 24-hour period after the eruption.
The Toutle and Cowlit: rivers experienced two successive flood crests, the second crest occurring early on May 19.       At Castle Rock, it equaled a 250 year frequency flood. This flow came f rom less than one-fourth of the river basin's drainage area.                      Ta.y. yiWhriiliiice"begyidEN t
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not exceed previous record flood levels in the Cowlit: and Columbia                    l l
rivers, although they did approach major flood levels in the Cowlit: River
                                                                                                )
above 1.ongview and Kelso. Mudflows in the lower river did not build up at any one location, but resulted in unif ors layers of sand and gravel and
* other debris deposits throughout the floodplain of the lower Toutte and l
lower Cowlita River valleys.       Instead of the nor: sally stained hidh-water I
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N.F. Toutte River from river mile 0.0 to 6.1 in the vicinity of Toutle Lake.

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0 PLATE 3.-- Mudflow inundation map for Toutte River from river mile 4.3 to 13.4 and Q%rp R.abe in the vicinity of Toutte Lake.

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unetter sings capsiutut or to e mitaton                                                                                                    eveeee.e sa m .ete                                                 o me                                                                                     wart >assouncea w:ssticarious esotocacat ,sunYsy .                                                                                     t.,               --pesana6 emaneancy esanassuste .se,a=ct .
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in the vicinity of Vader.                                                                                                                                                                                                                          C/       [@

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Toutte River from river mile 0.0 to 2.7 in the vicinity of Castle Rock.

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in vicinity of Kelso and Longview.                                                                                                                                                                                                         u
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