ML20133F743

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Forwards Transparency Matls Presented at 840223 Meeting Re Facility
ML20133F743
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 03/12/1984
From: Laird L
INTERIOR, DEPT. OF, GEOLOGICAL SURVEY
To: Ballard R
Office of Nuclear Reactor Regulation
Shared Package
ML19264D658 List:
References
FOIA-85-353 NUDOCS 8508080415
Download: ML20133F743 (17)
v • d • e


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UNITED STATES

[

DEPARTMENT OF THE INTERIOR g

GEOLOGICAL SURVEY Water Resources Division 1201 Pacific Avenue, Suite 600 Tacoma, Washington 98402 4

March 12,198[

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Mr. Ronald L. Ballard, Chief

'i Environmental & Hydrologic Engineering Branch Division of Engineering U.S. Nuclear Regulatory Commission l

Washington, D.C.

20555 1

Dear Mr. Ballard:

.i Enclosed as you recently requested are copies of the transparency materials that we presented at our February 23, 1984' meeting in your offices on the subject of the Trojan Nuclear Power Plant.

Sincerel

ours,

. Laird District Chief Enclosures i

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.g 8508080415 850618 PDR FOIA BELL 85-353 PDR

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SPIRIT LAKE BLOCKAGE FAILURE i

I BREACH CONDITIONS

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1 Parameter At Failure At Present (2/84) t f

Lake stagell 3,475 ft 3,461 ft l

Lake volume 314,000 ac-ft 272,000 ac-ft i

Avalanche deposit volume 3.9 x 109 yd3(bulk) same Median grain sizes at crest L

Above 3,527 ft 0.06 mm 3,518

.3,527 ft

.25 mm 3,518 - 3,450 ft 50 mm Below 3,450 ft 7.00 mm Deposit volume in path 2.6 x 109 yd3 (bulk) sane Deposit porosity 32 percent No change Deposit saturation 50 percent

>50 percent Type of failure piping (4,400 ft to elev. 3,448) 3 Breach peak discharge 530,000 ft /s Sediment volume entrained 2.4 x 109 yd3 bulk) 1.63 x 109 yd (solids)

Breach discharge multiplier 5.0 Peak discharge multiplied 6 3 (Camp Baker) 2.65 x 10 ft fs Sediment concentration 65 percent by volume Peak discharge (mouth Cowlitz 6

3 1.09 x 10 ft /s (routed)

River)

,_/ Maximum stage is 3,532 f t (blor.kage low point), volume 500,000 ac-ft, mininun l

lake stage (empty) is 3,310 f t.

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itipliers:

r Expressions used to determine flood volume ru LV = lake volume PV = pore Volume SV = solids volume =AV - PV TV = total volume = LV + SV + PV

  • S S = saturation PY*S = Mater volume in pore spaceC = percent sediment conc l

- SV x 100 SV x 100 TV SV + PV*S + LV

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M = lake volume ruttiplier to obtain TV t-

= TV U

AV = avalanche material volume = SV + PV trations for lake volume at lake Example cultipliers for several sediment concen elevation 3,475 f t = 314,000 ac-f t9 yd 3

= 0.507 x 10 Volume Table.

3 (All Volumes x 109 yd )

tt C

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PV*S2/

SV 2.0 40 AV 1.02 2.6 LV 41 50

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.16 1.98 5.1 0.507 31 1.19 65 98 28 2.62 7.4

.507 56 1.71 70 1.75 40 3.75 507 80 2.62 2.51 62 507 1.23 3.85 e.501 i

I/ Porosity = 32%

4 2/ Saturation = 50%

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i SPIRIT LAKE BLOCKAGE FAILURE MUDFLOW ROUTING CONDITIONS i

8 Model: Kinematic wave (Land, USGS, K634)

Distances:

Toutle River, 34 niles Cowlitz River,16 miles downstream from Toutle River 20 miles upstream from Toutle River Input:

Spirit Lake breach hydrograph, multipl'ied by 5.0 to include sedinent and pore water from avalanche, applied to North Fork Toutle River at Camp Baker, duration 25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />, peak 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> af ter breach by p.iping 3

increases to 40,000 ft fs, Channel geometry:

Based on cross sections obtained photogranmetrically from photos summer of 1980 Cross-section spacing:

About 1 nile, nodes spaced at 0.2 mile on Tcutie River and 0.3 mile on Cowlitz River.

Roughness coefficients:

Varied with depth of flow in cross section, Manning's coefficient based on equation developed by Dr. Cheng-lung Chen:

n=0.3151[225 (HR) 5/6 with,4ce (dynamic viscocity) = 50 and depth used instead of hydraulic radius (HR) to avoid discontinuities at transition of channel to floodplain.

Channel deposits:

None applied; model does not have moveable bed features.

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TABLE 1.--Simulated water-surface elevations in the Colunbia River at Trojan Nuclear Power Plant for the coincidence of high tide, a hypothetical mudflow with a peak discharge of 1.1 million ft /s in the Coulitz River, and selected 3

Columbia River discharges Colucbia River Coluobia River discharge upstream k'a ce r-surf ac e flow condition of Cowlit: River eleva: ion

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(ft3/s)

(feet) a/

b/

2 year peak 410,000 25 38 10-year peak 610,000 28 44 50-year peak 750,000 30 47 100 year peak 820,000 32 48 a,/ Co=puted with } tanning's coef ficients for clear water.

g b,/ Co=puted with !!anning's coef ficients for a mudflow downstrea= of I

the Cowlitz River and clear water upstreas of the Cowlitz River.

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River at elevations in the Columbia that for selected Colucbia River discharges billion cubic f

TABLE 2.--Simulated water-sur ace is assueed to have deposited 0.5bia River chan h

Trojan Nuclear Power Plant a maximus surface audflow that ycrds of sediment in the Colum assumed to haveThe surface elevation follow a is The depositat the Cowlitz River. feet per =ile River.

Cculit:

clsvation of 30 feetupstream direction at 2.5 I

8 decreases in the Coluebia River Mater-surface discharge upstrea=

elevation of Co litz River (ft3/s)

Colu=bia River w

flow condition (ft3/s) 39 i

45 250,000 49 Lov flo" t.10,000 2-year peak 610,000 52 r

i 10-year peak 750,000 50-vear peak W

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Dign.ss dam) r

.hT Cans! S A kE R.(Yas of

.....................................and degree of saturation =

50=).

USGS (DebrAs porosity = m t, i

1.63 bey sediment from debriswater from debris

=

2 4 bey x 0.68 air from debris 2.4 bey x 0.32 x 0.50 = 0.36 ber2.4 bcy z 0.32 s 0.50 = 0.36 bey water from Spirit Lake I

0.51 bey j

.................................... Cowl e r Z Riv t R.

4 h1ouTH OF............................

9

.S T the debris dam.

e routed from USGS Full sedieent and water hydrographs wer 1.63 bey sedicent bey water

}

0.38 + 0.51 = 0.89 2.52 bcy total a sharply-peaked hydrograph i

Peak discharge was obtained by rout ngby volume from Camp Baker.

with 65 percent mediment cia sediment 708.500 381,500 cfs water 1.090.000 cis total I FRO COLUMBIA Riv!R

  • ..e****

USOS

-.on to Colurbia River.at confluence (75 en) deposited Gravel and Cobbles 40%

40% of debria

-- on to Columbia River, 30* deposited at confluencecarrted beyond conflue t-Sands (0.0625 to 5 mm) t of debris 104 40%

-- on to Coluable River, carried beyond confluence Salt and Clay t<0.0625 mm) 204 of debria fluence of 204 sediment deposit at the con bulked volume of thelitz is The tottithe Columbia River and the Cow (30*)

1.68 bcy -- 0.50 bey upstream 1.15 bcy counstream (70s) 2.4 bey a (0.40 + 0.30)......................................

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I uses Gravet and Cobbles (>5.em) -- on to Coluable River.

40x of debria 40s cepost ted at confluence Sands (0.0625 to 5 am)

-- on to Columbia River,

, 40* of debria 30s deposited at confluence los carried beyond confluence Silt and Clay ( <0.0625 mm) -- on to Columbia River, 20% of debria 20* carried beyond confluence The total bulked volume of the mediment deposit at the confluence of the Colur.bia Raver and the Cowlitz is 2.4 bey x (0.40 + 0.30) = 1.68 bey -- 0.50 bey upstream (304) 1.15 bey downstream (70s)

Simons & 1.1 Gravel and cobbles (>5 mm) -- 40* deposited in Toutle 40* of debria i

Sanda (0.0G25 to 5 cm)

-- 20x deposited in Cowlitz 404 of debris 20% deposited at confluence *

  • a Silt and clay (<0.0625 mm) -- 204 carried beyond confluence 20* of debras i
  • Table 3.6 has a slaght variation in percentage oeposited in the Cow 11tt, but a 507./50s optit mand /a11t-clay was actually used in the computer runs of appendix B.,

The computer runa of appendix B show about 984 (minimun 944) of

\\the aand load entering the confluence la deposited there.

3 The bulked volume of the mediment deposit at the confluence of the river is Co,lumbia River and Cowlitt

.45-1.26 bey n.20 x.98 =.09.25 bey -- 02.05 bey upstream (20=>

    • e s

(804) 07.20 bey downstream

'The upstream / downstream split wem estimated by scaling profiles in figure 3.5.

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3 .w___ .b...._._. ...O. .Lt...A1._........._.,_..._.-.h...- ? 4 , ( j r .I i i t TABl.E 1.--Simulated water-surface elevations in che Columbia River at Trojan Nuclear Power Plant for the coincidence of high tide, a hypothetical mudflow with a peak discharge of ( 3 1.1 million ft /s in the Cowlitz River, and selected Columbia River discharges Colucbia River Coluobia River discharge upstream k'ater-surface flow condition of Cowlit: River elevation (ft3/s) (feet) a/ b/ r 2 year peak 410,000 25 38 10 year peak 610,000 28 44 50 year peak 750,000 30 47 100 year peak 820,000 32 - 48 i 1h'. a,/ Co:puted with itanning's coef ficients for clear water. t ' b,,,/ Co=puted with !!anning's coef ficients for a cudflow downstres: of the Cowlitz River and clear water upstreas of the Cowlitz River. s i e S b - -JL

.AL.=--.L5 D.a.a.a - u Y c N- ,z l IMPACT ON TROJAN OF POSSIBLE DISCHARGE OF SPIRIT LAKE l Division of Engineering .4 By Raymond Gonzales, Environmental and Hydrologic Engineering Branch t The vols.mic eruption of Mount St. Helens on hay 18, 1980 resulted in a massive 4 and potentially unstable deposit of debris blocking the ou,tlet channel of Spirit 3 Lake and has caused a dramatic increase in the volume of water stored in the lake. I If the blockage of the lake were breached, the resulting mudflow flood could e i possibly affect.the safe operation of the Trojan nuclear power plant, located on j' the Columbia River about 4.5 miles upstream of the mouth of the Cowlitz River. (See the map on the next page.) A mudflow associated with the May 1980 eruption deposited sediment in the Columbia River, mostly in a stretch from about 5 miles downstream of the mouth of the Cowlitz River to 4 miles upstream. The Trojan plant was not directly affected, although large deposits were. measured near the intake structure. There now exists a potential for a more severe mudflow. To reduce the potential for failure of the blockage to Spirit Lake, the Corps of Engineers constructed and is operating.a pumping. facility at the lake as an 1 interim measure to control the lake level. However, greater-than-normal rainfall, failure or disruption of the pumping system, and/or addition of debris into Spirit Lake from another eruption could cause the lake level to rise excessively. The NRC has contracted with the Geologic Survey to furnish a conservative estimate of the flows and elevations in the Columbia River at the Trojan plant that would result from a Spirit Lake breakout. One problem is the lack of a good computer model to predict the transport of a mudflow in an upstream direction at river confluences. One scenario considered is the concurrent occurrence of a mudflow in the Cowlitz River and a flood in the Columbia River. For a coincident flow of I about 690,000 cubic feet per second (cfs) and on the assumption that the roughness coefficients for the Columbia River downstream of the Cowlitz River simulate the hydraulic properties of mudflows, the water level at the Trojan plant would rise as high as the plant grade elevation of 45 feet above mean sea level (f t ms1). (If clear-water roughness coefficients are used, a river flow as high as 850,000 i cfs would result in a flood elevation of only 32 ft msl at the Trojan plant.) The other scenario. considered was the occurrence of a mudflow depositing sediment in the Columbia River during a low-flow period, followed by a river flood; for a flood flow of about 430,000 cfs or greater, the water level at Trojan would be at or above tha plant grade elevation of 45 ft msl. TheTrojanlicenseemadeanindependentstudyOhtheeffectofamudflowonthe plant. The worst case considered was a flow of 800,000 cfs in the Columbia River coincident with a mudflow in the Cowlitz River that would deposit sediment in the Columbia upstream of its confluence with the Cowlitz. A flood elevation of 39 f t msl was estimated at the Trojan plant. .\\ NRR staff has reviewed the analyses of the Geologic Survey and of the licensee. Because of the uncertainty of the applicability.of the computer models used and because of the severity of the consequences should flood waters exceed plant grade, the staff concludes that the results of the more conservative Geologic Survey analyses should be used as a basis for establishing limiting conditions i for the operation of the Trojan plant. t I /* //h J i

_..u . a.,_ f The licensee has also considered the possibility of. sediment from a mudflow blocking the intake. structure and affecting the service. water system which il provides safety-related cooling water. In the event that the intake to the service water system is lost, the licensee is required by existing Technical Specifications to shut.down the plant..In lieu of the service water system, adequate cooling for. safe shutdown can be provided for.a minimum of 165 hours by the circulating water system and the. cooling. tower basin withcot makeup to the system. This cooling capacity can be maintained in thd event of concurrent i loss of off-site power by use of the cooling tower makeup pumps. which can be j connected to emergency. diesel generators. If the water in the cooling tower is exhausted by evaporative losses.before the intake to the service. water is restored, additional water can be pumped into the. cooling tower by temporary pumping. systems or fire pumpers. Water could probably be taken from the Columbia River or from two on-site lakes having a combined volume of approximately 100 million gallons. On the assumptions that only.70% of this volume is available and that there.is no inflow to the lakes, makeup water for the cooling tower basin is available for an estimated 97 days. .n ~ l k WASHINGTON study Y u...... e.. e.,,, e.g>

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