ML20050A373

Confirms 820316 Telcon Re SER Confirmatory Issue 64.Submits Calculations to Support UHS Sedimentation of 262 acre-ft During Pmf.Info Will Be Incorporated in FSAR Amend

ML20050A373
Person / Time
Site:	Clinton
Issue date:	03/24/1982
From:	Wuller G ILLINOIS POWER CO.
To:	John Miller Office of Nuclear Reactor Regulation
References
U-0447, U-447, NUDOCS 8204010223
Download: ML20050A373 (12)

Text

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t U-0447 ,

ILLIN0/S POWER 00MPANY -82(03-24)-6 500 SOUTH 27TH STREET, DECATUR, ILLINOIS 62525 March 24,1982

• e Mr. James R. Miller, Chief a Standardization & Special Projects Branch -

4 Division of Licensing p. #8ct Office of Nuclear Reactor Regulation , A 5'!r, .g U. S. Nuclear Regulatory Commission "#O -

j Washington, D. C. 20555 3- CI er 9

Dear Mr. Miller:

s /

4 b Clinton Power Station Unit 1 Docket No. 50-461 Per our telephone conversation with Mr. Rex Wescott of NRC/HGEB on March 16, 1982, concerning SER Confirmatory Issue #64, we are attaching a copy of our calculations to support the UHS sedimentation of 262 acre-ft. during a PMF. It should be noted that this number is arrived at by conservatively assuming that all the sediment picked up during a PMF is deposited in the UHS. These calculations were requested by Mr. Wescott for review. As discussed in that phone conversation, the following is reiterated:

UHS total capacity = 1067 acre-ft.

Volume required to shut down 2-Unit plant = 221 acre-ft.

Volume required for fire '

protection = 4 acre-ft.

PMF sedimentation = 262 acre-ft.

Volume of UHS available to accommodate normal sedi-mentation before dredging may be needed = 580 acre-ft.

Based on the above we are currently amending the FSAR to commit to an initiation of a dredging program when the sedimen-tation volume of the UHS equals 500 acre feet.

8204010223 820324 O PDR ADOCK 05000461 z E PDR 38 l

,hkkb i U-0447 Mr. James R. Miller C77 '

Page.2. L30-82(03-24)-6 [

A copy of the above calculations are being sent, as 1 requested by Mr. Wescott,_to-the following NRC consultant:

Richard L. Skaggs Research Engineer, Hydrologic Systems Section Water and-Land Resources Dept.

Battelle Pacific Northwest Lab Sincerely, E

G. E. uller Supervisor-Licensing Nuclear Station Engineering

' HBP:mr cc: J. H. Williams , NRC Clinton Proj ect Manager H. H. Livermore, NRC Resident Inspector Rex Wescott, NRC/HGEB (w/ attach.)

R. L. Skaggs , Battelle (w/ attach. )

i C

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• 4 SARGENT & LUNDY I ' ENGINEERS

' I" CNICAGO l

ULTIMATE HEAT SINK SEDIMENTATION Introduction The Ultimate Heat Sink (UHS) is a submerged pond in the North Fork finger of Clinton cooling lake, and is provided to supply emerger cy cooling water to safely shut down the plant in case a of failure capacity of of the main dam. The UHS has an area of 158 acre 2, 1,067 acre feet, and a depth of 6.5 feet, at i elevation of 675.00 feet. The drainage area at the UHS is 124 sqvare miles. The draw-down in the UHS due to shut down of the two units of 991 MWe would be 1.4 feet at the end of 60 days (FSAR Section 9.2.5) . This amounts to a loss of water volume of about 221 acre feet, or in other words, about 221 acre feet of water would be required to safely shut down j

two units. A concern was expressed that some of the UHS capacity l could be lost due to normal sedimentation and before the sediment l

could be dredged out, a major flood could bring in a large quantity of sediment and fill the remaining UHS capacity. This analysis was l

l done to estimate the amount of sediment that could be carried into the North Fork finger of the cooling lake during probable maximum flood (PMF). Assuming that all this sediment carried by North Fork will be deposited in the UHS, the sed'iment volume into the UHS during l PMF is estimated.

Volume of Sediment Entering the North Fork Finger of the Cooling Lake During PMF:

i a) PMP:

The probable maximum flood hydrograph was developed for North Fork finger of the cooling lake and is presented in Figure 1.

This PMF hydrograph is developed using the information provided in Section 2.4 of FSAR, Clinto'1 Power Station.

I b) Inflowing Sediment Load:

Prior to construction of the Clinton Dam, turbidity measurements l were made at Rowell Gaging Station by Illinois State Water Survey (ISWS) during 1950-1956. This period coincides with a severe historic drought in the Salt Creek Easin. It is generally con-l sidered by the hydrologists that turbidity measurements do not l

represent accurately the suspended sediment concentrations.

Hence, these data were not used in th analysis.

ISWS sbried a program in 1980 to measure suspended sediment con-centrations at Rowell Gaging Station. Since these measurements were started after the_Clinton Dam was built, these data do not accurately represent the actual sediment concentrations of.

l inflowing sediment in North Fork.

I 1

SARGENT & LUNDY I

EN GIM EE R S g CH3CAGO ISWS also started in 1980 a program to measure suspended i

sediment concentration on Sangamon River at Monticello (Drainage area: 550 square miles). Monticello is about

~20 miles east of Clinton. For lack of any other better data, the provisional suspended sediment data of Sangamon River were used as representative data of North Fork. A curve r between inflow and the suspended sediment concentration in Sangamon River at Monticello was drawn enveloping most of the data points as shown in Figure 2. This enveloping curve is adjusted for North Fork drainage area as follows: For any i

given sediment concentration the inflow in Sangamon River was

~takalfrom the curve in Figure 2 and was reduced in proportion to the drainage areas to obtain the flow in North Fork, and the same suspended sediment concentration was used for this North Fork flow. Thus the suspended sediment rating curve was developed for the North Fork and is shown in Figure 2.

, t Grain Sf.ze Distribution:

c)

Representative grain size distribution of upper deposits of Salt Creek alluvium, present in Salt Creek and North Fork drainage areas, was used.

s i

This is based on a soil boring located approximately one mile _

upstream of main dam on the bluff adjacent to Salt Creek.

This grain size distribution was assumed to be representative of the suspended sediment in the North Fork. Representative 7

grain size distribution of bedload is based on a soil boring

, at the bottom of North Fork channel just upstream of the UHS.

The composite grain size distribution of.the total sediment was I obtained by using weighting factors of 0.9 for suspended load

, and 0.1 for bedload (Table 1 and Figure 3 ) . ,

8 d) Computation:

The PMF hydrograph is divided into several intervals and the average discharge for each interval was calculated. The weight of sediment entering the cooling lake for each interval is ,

calculated. The total scaiment is increased by 10% to account i

, for the bedload. The corresponding sediment volumes of clay,  !

i silt and sand are calculated. The total volume of sediment is  ;

estimated as 262 acre feet during PMF. The calcul'ation is- '

attached for reference.

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