ML20069D328

Forwards Revised Response to NRC Question 241.15WC,providing Info Needed to Resolve SER Confirmatory Item A-2 Re Main Dam Seepage.Info Will Be Incorporated Into Fsar,Revision 10

ML20069D328
Person / Time
Site:	Wolf Creek
Issue date:	09/17/1982
From:	Koester G KANSAS GAS & ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
RTR-NUREG-0881, RTR-NUREG-881 KMLNRC-82-242, NUDOCS 8209210041
Download: ML20069D328 (9)

Text

a KANSAS GA AND' ELECTRIC COMPANY vm sucme ca.msy ,

GLENN L MOESTER vics eens.os%v wuctaan September 17, 1982 Mr. liarold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 KMLNRC 82-242 Re: Docket No. STN 50-482 Ref: NUREG-0881, Wolf Creek Safety Evaluation Report

Dear Mr. Denton:

Transmitted herewith is a revised response to NRC Question 241.15WC.

The purpose of this revised response is to provide information needed to resolve Confirmatory Item A-2 (Main Dam Seepage) identified in the Referenced document. This information will be formally incorporated into the Wolf Creek Generating Station, Unit No.1, Final Safety Analysis Report in Revision 10. This information is hereby incorporated into the Wolf Creek Generating Station, Unit No.1, Operating License Application.

Yours very truly, ff I

GLK:es Q Attach cc: Mr. J. B. Hopkins (2)

Mr. Thomas Vandel 8209210041 820917 PDR ADOCK 05000482 E PDR 201 N. Market - Wictuta, Kansas - Mail Address: PO. Box 208 I Wichita, Kansas 67201 - Telephone: Area Code (316) 261-6451

e r .

OATH OF AFFIRMATION STATE OF KANSAS )

) SS:

COUNTY OF SEDGWICK )

I, Glenn L. Koester, of lawful age, being duly sworn upon oath, do depose, state and affirm that I am Vice President - Nuclear of Kansas Gas and -

Electric Company,-Wichita, Kansas, that I have signed the foregoing letter of transmittal, know the contents thereof, and that all statements contained therein are true.

KANSAS GAS AND ELECTRIC COMPANY ATTEST:

By 6)[ i (Z (b Glenn L. Koester j Vice President - Nuclear W. B. Walker, Secretary STATE OF KANSAS }

} SS:

COUNTY OF SEDGWICK )

BE IT REMEMBERED that on this 17th day of September, 1982 , before me, Evelyn L. Fry, a Notary, personally appeared Glenn L. Koester, Vice President - Nuclear of Kansas Gas and Electric Company, Wichita, Kansas, who is personally known to me and who executed the foregoing instrument, and he duly acknowledged the execution of the same for and on behalf of and as the act and deed of said corporation.

.i1 ' WITNESS WHEREOF, I have hereunto set my hand and affixed my seal the p tbl.ati, year above written, n *

. r* ,

\~..,i r.uTf0.] J/i/a>v W&

-lf? Efelyn L/ Fry, Nota

~

My Co. . .umission expires on August 15, 1984.

l L

SNUPPS-WC R241.15WC (continued) d lateral movements, however, the move-ments recorded are considered within the

+ expected range. These movements are primarily the results of the non-symme-trical sof tening of the embankment that takes place during the filling of the reservoir. Very little data on lateral movements of dam embankments taking place during reservoir filling are avail-able. This is particularly the case for embankments less than 100 feet high such as the Main Dam Embankment at Wolf Creek; however, data from dams ranging in heighc from 250 to 700 feet high show lateral movements between 10 and 20 inches (Kjaernsli and Torblaa, 1968; Nobari and Duncan, 1972; Marsal, 1959).

The maximum settlement recorded to date is on the order of four inches and was observed within the closure section.

Settlements outside the closure section range from 0 to 2 inches. It is felt that the higher settlements recorded within the closure section reflect its ter construction period, thereby not a14owing time for completion of the con-struction related settlements prior to installation of the settlement monitor-ing monuments. Also, the embankment outside the closure section was nearly completed 6 to 12 months before con-struction started on the closure section.

The recorded settlements represent less than 1/2 of 1 percent of the embankment height. Based on reports on settlements of earth dams (Kjaernsli and Torblaa, 1968; Nobari and Duncan, 1972; Marsal, 1959) settlements up to one percent of the embankment are considered normal and acceptable.

Data collected to date on the observed seepage on the downstream toe of the Main Dam at Station 58+50 are presented in Table 241.15-6. Data on the cooling lake elevations on the date of each seepage observation are also shown on this table. The location of the seepage observations is shown on Figure 241.15-2.

The seepage observations made to date Rev. 10 241-19

SNUPPS-WC f

R241.15WC (continued) have generally been made by visual in-spection and, therefore, do not repre-sent precise quantitative data, The data are considered to represent reason-able approximations of the actual seep-age rates, however. More accurate quan-titative data will be obtained after construction of the temporary weir de-scribed in the response to part 2 of Question 241.15.

The observed seepage rate data collected to date indicate a wide range of flow rates ranging from 5 milliliters per second (ml/sec) to 1500 ml/sec. The majority of the observations, however, indicate seepage flow rates of less than 100 ml/sec. The higher flow rates which occasionally occur appear to be related to pe riods of precipitation which occurred prior to observation dates, and are not considered to repre-sent increases in seepage of water from the cooling lake through the Main Dam embankment, but rather infiltration through the toe drain. This is support-ed by the fact that peaks in the observ-ed seepage rates are always followed by a return to a substantially lower rate on later obse rvations . In order to illustrate the relationship between pre-cipitation and fluctuations in the ob-served seepage flow rates, the two sets of data are graphically compared on Figure 241.15-3. This figure represents the period through Decembe r 1981 for which digitized precipitation data are available from the onsite meteorological monitoring system. Although digitized precipitation data are not available for 1982, inspection reports indicate that rain runoff contributed to the occasion-l al peak flow rates observed in 1982.

l The data collected to date indicates i that observed seepage is well within the

! seepage rates previously estimated for j the Main Dam. Based on the permeability i values of the materials used in the con-l struction of the Main Dgm embankment, a

seepage rate of 0.6x10 cubic feet per l second (.16992 ml/sec) per foot of Main l Rev. 10

!- 241-19a l

SNUPPS-WC R241.15WC (continued)

Dam was computed in Section 2.5.6.6.1.

For the entire length of the Main Dam this corresponds to a seepage rate of 0.0734 cfs (Section 3.2.2.3.6 of Sargent

& Lundy report SL-3830, " Engineering Data Compilation for Wolf Creek Lake"),

which is equivalent to 2078 ml/sec.

However, since the observed seepage at Station 58+50 likely represents the seepage through only a portion of the Main Dam, the seepage would be expected to be less than 2078 ml/sec. If it is conservatively assumed that seepage at Station 58+50 represents seepage through only a 3,000 foot length of the Main Dam, seepage would be expected to be 3,000 feet x .16992 ml/sec/ft or approx-imately 510 ml/sec. Except for the occasional peak flow rates, which are attributed to site precipitation, the observed seepage rates at Station 58+50 are, therefore, well within the amounts which are reasonably expected. During all inspections the seepage water was observed to be clear and free of sus-pended soil particles, even during peak flows.

m REFERENCES Kjaernsli, B., and Torblaa, I., (1968),

Leakage Through Horizontal .C r acks, ~

in the Core of Hyttejuvet Dame? %

Norwegian Geotechnical- Institute -

Publication No. 80, Oslo, Norway.

ty.*'

L k

a ^ w ^

+

M af

~, . Rev. 10 '

241-19b ,

SNUPPS-WC

. h TABLE 241.15-6 (Sheet 1 of 2) l OBSERVED SEEPAGE RATES MAIN DAM STATION 58+50 Observed Cooling Lake Inspection Seepage Rate Elevation Date (ml/sec) (feet) 4-24-81 40 -

4-30-81 20 -

5-08-81 18 -

5-15-81 30 1958.9 5-21-81 200 -

5-29-81 100 1960.7 6-04-81 80 1961.3 6-12-81 80 1962.8 6-19-81 150 1963.7 6-24-81 125 1964.6

/-02-81 125 1965.6 7-09-81 20 1966.6 7-17-81 20 1967.0 7-24-81 15 1968.3 7-30-81 10 1969.2 8-06-81 5 1970.0 8-14-81 30 1970.8 8-21-81 5 1970.8 8-28-81 15 1971.0 9-03-81 100 1972.0 9-10-81 95 1972.5 9-16-81 75 1973.4 9-24-81 75 1974.1 10-02-81 50 1974.5 10-08-81 50 1975.3 10-16-81 400 1976.1 10-23-81 110 1976.8

, 10-29-81 50 1977.2 i

NOTES:

i 1. Elevations refer to SNUPPS reference datum.

2. Obse rved seepage rates for 1981 are plotted on Figure 241.15-3.

3. Seepage observations were made on downstream toe of

Main Dam at Station 58+50. Location is shown on Figure 241.15-2.

4. Unobservable due to ice cover.

l Rev. 10

^^ -

SNUPPS-WC f TABLE 241.15-6 (Sheet 2 of 2)

Obse rved Cooling Lake Inspection Seepage Rate Elevation Date (ml/sec) (feet) 11-06-81 500 1977.9 11-12-81 50 1978.7 11-19-81 10 1979.2 11-25-81 10 1979.3 12-03-81 40 1979.5 12-10-81 50 1979.5 12-18-81 10 1979.5 12-23-81 10 1979.5 12-31-81 10 1979.5 1-08-82 (See Note 4) 1979.5 1-15-82 (See Note 4) 1979.5 1-22-82 (See Note 4) 1979.5 1-28-82 (See Note 4) 1979.5 2-04-82 (See Note 4) 1980.3 2-12-82 100 1980.3 2-18-82 1000 1980.4 3-05-82 40 1980.4 3-11-82 40 1980.6 3-18-82 1500 1980.8 3-25-82 85 1980.9 4-02-82 40 1981.0 4-08-82 20 1981.3 4-16-82 10 1982.0 4-23-82 10 1982.4 4-29-82 20 1982.7 5-06-82 250 1983.6 5-14-82 250 1984.8 5-20-82 200 1985.9 6-02-82 1500 1987.5 6-11-82 800 1987.6 6-18-82 250 1987.6 6-25-82 1500 1987.4 7-02-82 100 1987.5 7-09-82 25 1987.5 7-19-82 300 1988.0 Rev. 10

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Rev.10 WOLF CREEK GENER ATING STATION UNIT NO.1 FINAL SAFETY ANALYSIS REPORT FIGURE 241.15-2 LOCATION OF SEEPAGE l OBSERVATIONS AT MAIN DAM i

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s Rev.10 l WOLF CREEK GENERATING STAllON l

UNIT NO. I l FINAt SAFE TY AN ALYSIS REPORT l

FIGURE 241.15-3 OBSERVED SEEPAGE AND PRECIPITATION DATA