ML20210T138

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Forwards Hydrologic Engineering Position for Transmittal to Util.Questions Necessary Due to Inadequate Responses to round-one Questions &/Or Design Changes
ML20210T138
Person / Time
Site: Satsop
Issue date: 01/23/1975
From: Harold Denton
Office of Nuclear Reactor Regulation
To: Deyoung R
Office of Nuclear Reactor Regulation
References
CON-WNP-1743 NUDOCS 8605290757
Download: ML20210T138 (6)
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R. C.7 eYoung Assistant Director for Light Water Reactors, 2

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tQ Q M M % m, ENGINEERING. POSITIONS!.(Q-2)M M %Rgg;&.g:4.::.;4

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C.; @M:> Responses " REVIEW 5TATUS:s Hydrologic Engi.neering Section, SAB.- Aw

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_r-gg Enclosed are. hydrologic engineering positions (Q-2), prepared h7

' by T. L.. Johnson and D. L. Milliken for your transmittal to b

- the-applicant.

The questions are necessary due to inadequate Ei

- responses to round-one questions and/or design changes since

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  • ,.; t h at.ti me... e call.to'your attention that the applicant pro-W c

poses 'to permanently lower the. groundwater elevatio'n approx-f 3 Maately? 70- feet by means"of.a passive underground dra,inagee 7 p.

F M, system.e Question 321.24 reflects our concerns regarding this l

design c.hange.

The applicant ~ originally proposed in his initial

.submittals to design for-a groundwater level at plant grade.

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i HYDROLOGIC EtlGIllEERIliG POSITI0tlS (Q-2)

WPPSS tluCLEAR PROJECTS f!0. 3&5 DOCKET 110S. 50-508, 509 s

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321.22 Your statemant that there are no existing 1

(2.4.4) dams or any authorized for construction up-I s tream of the site is incorrect.

He call I

your attention to Bloody Run Dam on,the

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Skookumchuck River, used for the Centralia fossil plant.

Discuss the effect cf a failure of this dam on flood levels at the plant.

Provide information on the dam location and information and pertinent data similar to that 1

i provided for Wynocchee Dam'(including the seismic design criteria).

321.23 You have not adequately or conservatively j

-(Position)-

described the groundwater environment in the (2.4.13) site vicinity, particularly the permeabilities existing downgradient from the site and the rates and direction of groundwater movement.

You have not shown the location of all ground-water users in the site vicinity; the well (5000' to the NilU) and its piezametric level that were used in your spill analysis are not i

shown on any_ figure in the PSAR.

Also, the travel time that you computed to this wel.1 is incorrect; effactive porosity was not i

considered in analysis.

Further, you did not provide an estimate of the dispersion and dilu-tion capability of the groundwater as the spill moves to the well.

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I You will be required to provide further perne-

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ability, porosity, and other suitable pumping test data, necessary to support your conclu-sions, on soils along probable downgradient

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flow paths.

The data that you have provided is not considered adequate.

Permeability

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data taken from only a few borings may not be representative of all soils along a flow path.

Since we do not know the location of the well

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in question, we have no basis for concluding that your permeability values are correct or conservative.

You should conduct enough tests at other locations in order to provide conser-vative valves of important parameters and provide the results of these tests.

Further, the maximum, rather than average, permeabilities should be used to compute travel times.

Using average permeability may not reflect more rapid I

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groundwater movement through the more permeable zonas, which apparently exist,

1 based on bering. data that you have provided.

Effective porosity must be used in your computation of travel time.

Also, provide j

a map showing the location of all groundwater

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users (including the location of the well i

used in your spill analysis), especially i

those on the south side of the Chehalis River, j

within a 2-mile radius of the site.

In addi-j tion, provide a conservative estimate of ability of the groundwater to disperse and dilute an accidental radwaste spill, including 4

the bases for your estimate.

-t 321.24 You have not demonstrated that your ground-(Position) water drainage system will be capable of de-(2.4.13) pressing and maintaining the groundwater level at or below your design elevation.

You should design the below-grade walls of safety-related buildings for a groundwater table elevation equivalent to plant grade, or sub-s tantiate that your groundwater drainage system will prevent the groundwater elevation from exceeding your ~ design level at all times.

If the latter alternative is selected, the following additional information must be supplied:

(1)

Discuss the ability of the system to withstand various natural and accidental a

j phenomena such as earthquakes, tornados, j

floods, and rupture of cooling water pipes inside or outside of safety-related 1

buildings,- and discuss the ability of -

the system to resist clogging.

(2)

Describe in detail both~your proposed radiological monitoring program of dis-charges from the drainage system and your proposed monitoring program to detect system failure.

Provide an esti-mate, and bases therefor, of the time avail-able to mitigate the consequences, and describe in detail your methods of mitigation.

We will require that you conduct sufficient pumping tests at enough locations to establish the groundwater level recovery time, that you furnish K

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.l-the results of these tests, and justify the methods used in evaluating the pumping tests.

'i Provide the various important parameters such as permeabilities, transmissivities, storage j

coefficients, drawdown at various observation locations in the cone' of influence, tabulations

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of drawdown versus time, tabulations of well

.j recovery versus time, and other pertinent data used in your analysis.

The pumping tests should be of sufficient number to describe the j

groundwater environment existing throughout the entire expected cone of influence due to

.t drawdown of groundwater levels as a result of 4

your proposed drainage system.

1 (3) Provide an estimate of the seepage rate through the system and the calculational bases used in your analysis.

(4) Provide pertinent design details and detailed drawings of the system, in plan and cross-section, showing the sizes, types, and locations of various drainage structures and exterior plant piping j

systems.

Show the drain-concrete uall interface for the vertical drains (if applicable).

i (5) Discuss the technical specifications (if app'li-cable) outlining operating procedures to be used in the event that the groundwater drainage system does not function under all expected ranges of natural phencmena and design events.

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321 25 Discuss the volume o'f water that is provided to i

[g*j*5) the CCAS wet cooling tower basins for makaup,

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and the methods used to compute this volume.

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