ML19249D583
| ML19249D583 | |
| Person / Time | |
|---|---|
| Site: | Skagit |
| Issue date: | 07/13/1979 |
| From: | Leech P Office of Nuclear Reactor Regulation |
| To: | Granstrand R SKAGIT SYSTEM COOPERATIVE |
| References | |
| NUDOCS 7909250012 | |
| Download: ML19249D583 (3) | |
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DISTRIBUTION:
C Dockets (ENVIRON)
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@ TERA 22L NRC PDR JUL 131979 LpDR.
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Docket flos. 50-522 EP-2 Reading and 50-523 RCodell c
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DSchreiber
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Mr. Richard L. Granstrand PLeech i
Skagit System Cooperative R. Goldstein (ANL)
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Box 277 W. Regan 9.-
LaConner, Washington 98257 D. Sells 23
Dear l1r. Granstrand:
Several months ago Bob Goldstein of Argonne National Laboratory referred your letter of January 30, 1979, to n.e for reply. The questions in your letter appear to be seekinC infomation as to how the inflow from the Skagit River
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- to the Ranney Collectors was calculated.
In Section 5.5.3.1 of this Comission's Final Environmental Statement on the Skagit Nuclear Power Project, inflow velocities of 0.1 to 0.5 fps are mentioned. However, the text also includes reference to the applicant's statement that the velocities through the gravel would be well below this range.
^9 The applicant's analyses, which are sumarized in the testimony of F.C. Mikels
.Q before the Atomic Safety and Licensing Board on July 31,1975 (Tr. 3042-3043, 3051-3057,3065-3068), indicate an average water velocity through the river e-bed of about 0.001 fps at the most permeable sites (Collectors 1 and 2) and lower average velocities at the other two sites (Collectors 3 and 4).
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Tl Dr. David Schreiber, formerly an HRC hydrologist and now a consultant, has made analyses which generally corroborate the applicant's estimates. Using 9
6 fj the method described by W. C. Walton in his textbook, Groundwater 'tesource g;f Evaluation (1970, pp.163-172), Dr. Schreiber calculated that the upper bound ci inauced streambed velocity under normal hydrogeologic conditions would not
-9 exceed 0.01 fps and the average induced water velocity would be about 0.'101 fps when all four Collectors are considered as a single system.
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" A copy of Dr. Schreiber's summary of his calculations is enclosed.
If you have further questions on this subject, please let me know.
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Sincerely, n
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1023 154 3
Paul H. Leech, Project Manager 2
79092500g Environmental Projects Branch 2 m?
g DivisionofSiteSafetyand M l:,@2
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i Received from Dr. David Schreiber May 1979 To estinate the uppar-bound velocity of water induced through thc strainted requires the following two basic stepa:
1.
calculate the infiltration rate through the streanbed (anount of
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induced infiltration or rivar water withdrawal divided by the streambad area of induced infiltration), and 2.
calculate the valo:ity of water induced through the stran= bed (infiltration rata divided by the effective porosity of the streanbed material).
The first step requiras the datemination of the streanbad area of induced inf_iltration. Walton definas this area as the product of the streanbed
. reach within the area of pumping influance between the points upstream and ik where drawdovn is negli ;ble,and distance between the shoreline dor.atraa:
7 and the rechr.rca bounds._y (lina of infiltration). The latter can be datar=inad free the infe= ttion rivan in Appandix G to the Environ = ental Report and given th2 location of the Fannay Collector enissona. The stra2= bed reach within the I
area of pu 2 ping influence can ba determinad by using the following equation (fran tha.IASH paper by F.C. Mikels and F.H. Klaer,1950):
1
- 2.. 5' G In., _, (,} D'p x.n. A )" r ( 2 D - Y, c,-. A )
p 5=
n R #* l' m where s = goundwat2r draudown at observation point Q, = total flow withdrawn by collector r = dictance from collector to point of observation p
A = angle between line connacting pumped and image wells and line connecting pumped well to obcervation point p = aquifer per=cability o = saturatr ; thickness of aquifer 1023 i55 D = distance from pumped well to line of infiltration (rechargeboundary).
.g sh 6m Dew ee es..gma.**om eiem e w,,
_2-For the collactor at site F (the location of Collector No.
1, which is in the cost parmeable material of any of the four collectors), the following tabulation lista the variation with drawdown in the velocity of water induced through the streambed:
- Velocity, Drawdown ft/aec ft 0.0001 0.01 0.0003 0.10 0.001 1.0 0.00$
10.0 It was Dar:her estimated that the9round-water drawdown at the river's edge nearest the collector caisson would be about 18 feet.
Thus, it is my professional opinion that the velocity of streasflow induced through the Skagit River streambed will not exceed an upper bound of about 0.01 ft/sec.
The average velocity induced through the streambed considering all four collectors as one syntes can be estimated as follows:
1.
estiante the average infiltration rate per foot of head loca through the strea= bed ucing the data from each of the three pu=p testa E, F, and G ( Appendix G, ER).
2.
Convert the average infiltration rate from atop (1) to a value correapanding to the average river temperature of h8 F.
3 estimate the average velocity induced through strea= bed.
f.s in the calculations for estimating the upperbound induced velocity, the streambed area of influence must be determined utilizing the drawdown equation with drawdown equal to 0.01 f t.
For this situation (all h $ollectora), the average velocity calculated was about 0.001 ft/sec, thus confirming the applicant's value.
1023 I56
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