ML20132C361
| ML20132C361 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/08/1984 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Johnston W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19264D658 | List:
|
| References | |
| FOIA-85-353 TAC-49636, NUDOCS 8408150104 | |
| Download: ML20132C361 (10) | |
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AUG8 E34 J'
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MEMORANDUM FOR:
William V. Johnston, Assistant Director 4
for Materials, Chemical and Environmental. Technology, DE
~
FROM:
Gus C. Lainas, Assistas L Director i
)
for Operating Reactors,, DL
SUBJECT:
SPIRLT LAKE AND TROJAN j
At our meeting with.PGE and USGS on February 23, 1984, we learned that USGS was conducting.a more refined sediment. transport routing model to further study the. impacts of a Spi.rit Lake breakout on the Columbia River.
It was expectednthat this more-real.istic. analysis would show lower flood elevations at Trojan.
W2 have just received. a. copy of a letter to..PGE from FEMA. Region X which has, as_ its enclosure, a. letter from USGS (La.ird) to FEMA Region X and which summarizes. the results of the..further USGS study as i,t applies to t
Trojan.
Among other things, it.shows a fTood elevation at Trojan of el. 40 feet for a Columbia River discharge of 750',000 cfs-(recurrence interval of 50 years). Mr. La.ird.further states that.he wi.ll expedite the final fonnal approval process.and. hopes. to ~ be able to provide the complete-report to FEMA X within several weeks (from July 24). Thus, we expect that it should. be available. at any moment.
In view of this most recent infonnation showing acceptable flood elevations at Trojan, it.would seem that the Spirit Lake issue does not pose an obstacle to safe operation (scheduled. to start up on or about August 22).
We reouest that you issue a. final safety evaluation of this matter as soon as possible. Should you not agree with this course of action, please let me know.
~['
Gus C. Lainas, Assistant Director for Operating Reactors, DL
/
Enclosure:
FEMA ltr dtd 7/31/84 (w/ attached USGS ltr dtd 7/24/84)
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cc w/ enclosure:
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Region X Federal Regional Center Bothell, Washington 98011 JUL 311984 Jack W. Lentsch, Manager Generation Licensing & Analysis, Nuclear D.tvision Portland General Electric 121 Salmon Street Portland, Oregon 97204
Dear Mr. Lentsch:
In response to concerns you raised in a recent telephone conversation with Chuck Steele regarding flood levels resulting from a Spirit Lake breach in the vicinity of the Trojan Nuclear Power Plant, f requested infomation from the U.S. Geological Survey on the status of their investigation. Although their report is not yet final, Les Laird, 3
i District Chief of the Water Resources Division, sent a letter dated i
July 24, 1984 explaining how the report currently reads in the area you are concerned about.
Enclosed is a copy of that letter.
Please feel free to contact me if you need any additional information.
i' Sincerely, N. Ar__
n Wm. H. Mayer j
Regional Director Enclosure f
Copies to: Messrs. Withers, Orser, Steele, Yundt, Lentsch, Gaidos, Hoag, Zir:.erman, Burton, Jordan, Holm, LIS, TNP: GEN ENGR 7 FSAR:2.1, Bushnell
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DEPARTMENT OF THE INTERIOR j
q GEOLOGICAL SURVEY
-M Water Resources Division Pacific Northwest District 1201 Pacific Avenue - Suite 600 Tacoma, Washington 98402 Jv'j 24,1984
_W s
N Mr. William Mayer, Regional Director FEMA - Region 10 Federal Regional Center Bothell, Washington 98011
Dear Mr. Mayer:
As a result of our telephone conversation of July 23, I wish to document the status of the report on the investigation of the " Impact of an out-burst of Spirit Lake on the Columbia River," which has been supported financially by your office. The report has had colleague technical reviews by Dr. Danny Fread of the National Weather Service and Dr. Carlos e
Alonzo of Agricultural Research Service. We are processing the report for approval by the Director of the Geological Survey, which will probably take several additional weeks.
You advised that the Nuclear Regulatory Commission (NRC) will not allow Portland General Electric Company (PGE) to return the Trojan Nuclear Power 1
Plant to full generating capacity until the NRC is inforraed of the results of our study, specifically the impact of flooding on the Trojan Plant affected by a mudflow produced by a theoretical outbreak of Spirit Lake at Mount St. Hel en s.
With the understanding that the data are provisional and subject to further
.s review and revision, we can provide some information on our results that may be useful to you, the NRC, and PGE.
We used Dr. Fread's non-linear, time-dependent, one-dimensional flow model, slightly modified, as the basic analytical tool and used the following major assumptions:
0.51 billion yds 3 : jll ll5 C i n
Content of Spirit Lake j
Bulk volume of material 4
billion yds 3 e [05 ge r f eroded from the debris l
avalanche at Mount St. Helens 1.3 3
-e Water from debris material to l
Spirit Lake volume 0.37 billion yds 3, 2,0.,1, ;.
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1 3 - j dg $5 j?O-k Solids from debris material 0.88 billion yds Sediment concentration of mudflow 50 percent by vol m e near the debris avalanche of mudflow would be deposited in the Toutle-Cowfitz Valleys 60 percen 0 %)(. 68 billth $ ') *.53 bi/Akph')
' 326 8/2 #0.g d
7 Solids removed from the flow in the 0.53 billion yds 3 j
deposits remaining in the deposited sediments 0.25 billion yds 3 154959 ac'N' Water-removed from the flow and
= D 5 dj$ BC'[('
Volume of flow entering the Colmbia d
0.88 billion yds 3 j
River Percent solids of flow entering 3
40 percent ds
- p o.g p a y ). 3 5 hillu u y.
Columbia River Sediment wash load (not deposited, 25 percent 1
but carried out to sea)
(we)(.u %) r odi/A*.
se}iv.
bopsbe) w. C tubic 0Wer-.
(75 g y gg. 9., y pjf Q,l Using these assumptions and a flow of 410,000 cfs (2-year recurrence inter-val) in the Columbia River, the model analysis indicated the backwater in the Colu.bia River, produced by sediment deposition in the Colmbia, would produce a staae of less than 38 feet at the Trojan Plant--which compares to critical level of 45 feet, above which the plant would be flooded. At a Columbia River discharge of 750,000 cfs (recurrence interval of 50 years) the elevation at the Trojan Plant would be 40 ft--again, using the assoptions cutlined above.
We will expedite the formal approval process for the report and hope to be able to provide it to you within several weeks.
In the interim, we hope that the above data will be useful to you, NRC, and PGE.
Sincerel yours,
, air District Chief
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TABLE 2 Flood elevations in the Colunbla River at the Trojan Nuclear Plant iISGS Analysis Ll5Cd ${ tid O f 7 Licensee's Scenario No. I Scenario No. 2 MA cri Coluabla ' liver Analyses Itdflow Clea r-tra ter bre d itf A -
3 ke Conditions Condit ons
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125,000 cfs 31 ft ms1 s
250,000 cfs 39 ft ms1 400,000 cfs 35 ft ms1 410,000 et5 4
< 38 & P'5l 430,000 cfs 38 ft ms1 25 ft ms1 45 ft ms1
.640,000 cfs 4 ft ms1 28 ft ms1 49 f t ms1 _.
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- 690,000 cfs
$45 ft ms1 750,000 cfs 40 # msf.
l 790,000 cfs 47 ft ms1 30 ft ms1 52 ft ms1 l
800,000 cfs 39 ft ms1 050,000 cfs 48 f t ms1 32 ft ms1 l~
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- 6f6,000 cfs flow in the Columbia River was not considered by either the ilSGS or the Licensee. This flow was extrapolated by the NRC staff to correspond to a water Sevel at the Trojan Plant of 45 f t msl which I
4 is the plant grade elevation.
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TABLE I Ilsr.S ANALYSIS Scenario No.1 Scenario No. 2 Licensee's Mud flow Cl ea r-Ita i.e r Analyses Conditions Conditions Spirit Lake volume / elevation 310,000 ac-f t/
314,000 ac-ft/
314,000 ac-ft/
314,000 ac-f t/
Jid,000 4C-fi~
j at time of breakout 3,475 ft 3,475 ft
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65%
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65%
60 /I percent by volume entralr.ed fran debris blockage I
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65%
65%
65%
percent by volume in mudflow at the mouth of the Cowlitz
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Peak of mudflow into
.3.86X10 efs 1.1X10 c7, j,jgjg cfs 1.1X10 cy, _ _
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9 3 Sediment volume deposited..
0.28X10 yd 0
0 0.50Y10 yd
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in Columbia River f
Slope of sediment deposited
-7.5 f t/mi NA NA
-2.5 ft/mi of Cowlitz River f
in Columbia River upstream j-4 Assumed tide level in _ _ _ _ _
7.5ft 9.6 f t 9.0 ft 9.0 ft _
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Columbia River at down-stream end of reach Assumed hydraulic preparties
. clear water F.ud fl ow clear water clear water of flow in Columbia River downstream of Cowlitz River i
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