ML20041G410
| ML20041G410 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/16/1982 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041G411 | List: |
| References | |
| NUDOCS 8203220221 | |
| Download: ML20041G410 (8) | |
Text
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7 4
KANSAS GAS AND ELECTRIC COMPANY THF E L E CTf hC COMf'ANY GLENN L K O E S T E fe vm t **se saeta. t emut u ase March 16, 1982 Mr. liarold R.
Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 9
4 washington, D.C.
20555 RECEjyq 0],9 Q
KMLNRC 82-177 8-DC Re:
Docket No. STN 50-482 O2A j
Subj: Additional Information
\\
Dear Mr. Denton:
E m
In discussions with Mr. Jon IIopkins, NRC Project Manager for the Wolf Creek Application, and the NRC Staff, potentially open issues in the NRC's Safety Evaluation Report (SER) have been identified. The purpose of this letter is to provide information
~
that should close several of the issues.
Attached are revised FSAR queltion responses and additional information concerning limestone solutioning, the UIIS dam filling test and the main dam monitoring program.
This information will be formally incorporated into the Wolf Creek Generating Station, Unit No. 1, Final Safe.ty Analysis Report in Revision 9.
This information is hereby incorporated into the Wolf Creek Generating Station, Unit No. 1, Operating License Application.
j Yourg very truly,
(&*) t.
d'8 h
Glenn L. Koester Vice President - Nuclear GLK:bb Attach cc: Mr. J.B. Hopkins (2)
Division of Project Management Of fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Thomas Vandel, Resident NRC Inspector f(
P.O. Box 311 g
Burlington, Kansas 66839 I
8203220221 820316 I
I PDR ADDCk O3000482 tail Address: PO. Box 208 I Wichita, Kansas 67201 - Telephone: Area Code (316) 26I 6451 A
OATH OF APPIRMATION STATE OF KANSAS
)
) SS:
I COUNTY OF SEDGWICK )
f I, Thomas D. Keenan, of lawful age, being duly sworn upon oath, do depose, state 'and af firm that I am Director - Nuclear Operations of Kansas Gas and Electric Company, Wichita, Kansas, that I have signed the foregoing letter 4
of transmittal for Glenn L. Koester, Vice President - Nuclear of Kansas Gas and Electric Company, know the contents thereof, and that all statements contained therein are true.
i PJWSAS GAS AND ELECTRIC COMPANY By fMQd M
l j
Y.Tomas D. IUfeha'n i
Di rector - Nuclear Operations -
W.B. Walker, Secretary I
t i
STATE OF KANSAS
)
) SS:
COUNTY OF SEDGWICK )
i.
BE IT REMEMBERED that on this 16th ay of March, 1982
, before me, Evelyn L. Pry, a Notary, persona _y appeared-Thomas D. Keenan, Director.-
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Nuclear Operations 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 j
act and deed of said Corporation.
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IN WITNESS WHEREOF, I have hereunto set ny hand and affixed my seal the date and year above written.
....in...,
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.elyn[' Pry, Nota iPubuo
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Myco,u,bsionexpiresonAugust 15, 1984.
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1 SNUPPS-WC R241.15WC (continued)
Main Dam and Reservoir," dated January 6, 1981.
This report was provided to the NRC in letter KMLNRC 82-157, dated February 4,
1982.
Instrumentation measurements are performed in accordance with the procedures defined in Attach-ment 241.15-1.
During operation of the Wolf Creek Gen-erating Station, the performance of the main dam will be evaluated thtaugh a program of movement monitoring and vis-ual inspection, using the same proce-dures discussed above.
Vertical and horizontal movement of the main dam will be monitored, as defined in items III and IV of Attachment 241.15-2.
The down-l stream slope, the toe and the immediate
[
downstream area of the main dam will be visually inspected in accordance with
[
the same schedule noted in Attachment 241.15-2 for vertical movement.
During operation of the Wolf Creek Gen-erating
- Station, visual inspection of the main dam will include inspection for abnormal seepage, per Paragraphs 3.2.2 l
and 3.2.2.5 of " Procedures for Comple-tion and Filling Inspection of the ' Main Dam and Reservoir,"
Dames
- Moore, January 1981.
When visual inspection indicates an excessive seepage rate, the rate of seepage will be measured by con-structing a temporary weir, with a drain pipe, in the drain channel at the toe of the dam.
The flow of water through the weir will be measured and recorded along with the location of the weir in the drainage channel and the date and time of the flow measurement.
The flow rate through the weir, less the amount of precipitation run-off into the drain channel above the weir, will provide a measure of the rate of seepage through the dam.
The rate of seepage, and the seep characteristics will be evaluated in regard to dam safety in accordance with the requirements of state juris-diction.
The seep rate will be measured and evaluated once a week until the seepage rate stabilizes to a rate equal to or less than the calculated normal Rev. 9 241-18
SNUPPS-WC R241.15WC (continued) seep rate noted in Section 2.5.6.6.1 of the FSAR Site Addendum; thereafter, seep-age will be visually monitored per the same schedule noted above for visual inspections.
Upon completion of lake filling to nor-mal operating level, a report will be prepared to summarize the performance monitoring program for the main dam.
Theteafter, inspection reports and engi-neering review summaries will be pre-pared in accordance with the require-ments of state jurisdiction.
The lake fill completion report, and subsequent dam inspection reports will be maintain-ed on file at the Wolf Creek Generating Station, and will be available for ref-erence in accordance with Paragraph c.5 of Regulatory Guide 1.127, Revision 1.
The main dam is not considered a back-up structure for the safety-related UHS dam.
As stated in Section 2.5.6.1 of the FSAR, the UHS dam is designed to te-tain sufficient cooling water for safe shutdown of the plant, assuming a loss of the main cooling lake water.
The performance monitoring instrumenta-tion, the program for periodic monitor-ing of the instrumentation and the pro-gram for periodic inspection of the UHS dam are described in the attached Sec-tion 2.3.4 of Sargent and Lundy report, SL-3831,
" Engineering Data Compilation for Water Control Structures at Wolf Creek Lake."
Details for installation of the instrumentation are shown in Sargent and Lundy drawing S-81.
Instru-mentation measurements on the UHS dam are performed in accordance with Attach-ment 241.15-1.
3.
Data collected to date on the vertical and horizontal movements of the main dam are presented in Tables 241.15-1 through 241.15-4.
Data collected to date on the main dam piezometer water level eleva-tions are presented in Table 241.15-5.
Locations of movement monuments and piezometers installed in the main dam are shown on Figure 241.15-1.
Rev. 9 241-18a
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SNUPPS-WC R241.15WC (continued)
The data collected show lateral move-ments on the order of 0 to 3 inches with most of the movements taking place with-in and west of the closure section (west of approximately station 60+00).
No analysis was performed to predict the 4
1 F
i Rev. 9 241-18b i
SNUPPS-WC R241.16WC (continued) and after filling, and no signs of dis-tross or piping were noticed.
Conse-quently, there should be no danger of the UHS dam embankment failure from dispersive piping.
The results of the dispersion tests on samples from the main dam embankment are shown on Table 241.16-2.
It should be noted, however, as was the case for the samples from the UHS dam embankment, that when the samples showing dispersive behavior were tested using water from the John Redmond Reservoir, the samples did not test dispersive.
The conditions at the main dam are being visually in-spected weekly.
2.
To provide assurance of the safety of UHS dam, the UHS basin was filled with water while the downstream (toe) water level was kept at or below 1955 feet for a
thirty-day observation period.
During the UHS fill and observation periods, the performance of the UHS dam was assessed through a program of visual inspection, monitoring of movement in-strumentation and monitoring of water elevations.
The UHS basin was filled and maintained with water from the John Redmond Reser-voir to an elevation of 1969.0 to 1969.5
- feet, while the lake water elevation downstream of the dam was maintained below elevation 1955 feet for a thirty-l day observation period.
Pumping opera-tions to fill and maintain the water elevations in the UHS basin were per-formed in accordance with the criteria specified in Attachment 241.16-1 and the test procedure specified in Attach-ment 241.16-3.
During the fill and observation periods, daily measurements, to the nearest 0.1 foot, were taken to record the water elevation in the UHS basin, in the lake downstream of the UHS dam and in a downstream pond which is southwest of the UHS dam.
In addition, pump flow rates were measured and pump-ing periods were recorded for all pump-ing operations necessary to maintain Rev. 9 241-22
SNUPPS-WC R241.16WC (continued) the water elevation in the UHS basin and to remove water from the area at the toe of the UHS dam.
Prior to filling the UHS basin, the base elevations and coordinates were recorded for monuments 1 through 9 on the UHS dam.
During the fill and observation periods, the monuments were periodically monitored for vertical and horizontal movement, per the procedures outlined in 41.15-1.
During the initial fill
- period, from May 20, 1980 to September 30, 1980, vertical movements of the monuments were recorded weekly; for the remainder of the fill period and the thirty-day observation period, vertical movements were recorded monthly.
Horizontal movements of the monuments were recorded monthly from May 23, 1980 to September 24, 1980, and thereafter, per the schedule defined in Attachment 241.15-1.
The monument monitoring data recorded during the fill and observation periods indicates vertical movements in a range from 0.1 inches to 0.6 inches, (May 20, 1980 to January 5,
1981) and horizontal movements from 0.8 inches to 3.1 inches (May 23, 1980 to September 24, 1980).
In addition, the UHS dam and the area l
downstream of the dam were inspected weekly during the fill and observation period for
- seepage, stability and segregation of the riprap material.
Data recorded during the UHS dam test program are on file at the Wolf Creek I
Generating
- Station, Unit No.
1.
The UHS dam test data, and the results of the visual inspection were reviewed and l
summarized in the Section entitled
" Observation Period" of report " Surveil-lance of Earthwork, UHS and UHS Dam,"
I by Dames & Moore,
- August, 1981.
The
" Observation Period" section of this report is provided in Attachment 241.16-2; and the complete report is provided in
Response
241.24, Item 5.
The data and observations recorded Rev. 9 241-23 l
SNUPPS-WC l
R241.16WC (continued) during the UliS dam test program are within the normal ranges for a compacted earth dam, i
Plasticity indices were determined for samples from the borrow material.
Once the material was compacted in-place, additional test samples were taken to verify that the range of plasticity indices did not deviate significantly from the range of indices for the mate-rial initially tested from the borrow areas.
The in-place plasticity indices were evaluated by the field geotechnical inspection staff and found consistent with the borrow material data.
The range of plasticity indices for main dam materials are given in FSAR Tables
- 2. 5-7 4 and 2. 5 -7 5.
The indices for the UHS dam materials are given in Tables 3 and 5 of the 1981 Dames & Moore Report
" Final Report, Surveillance of Earthwork, UHS and UHS Dam, Wolf Creek Generating Station, Unit No.
1."
This report is provided in the response to NRC Question 241.24WC Item 5.
3.
The information provided with this re-sponse will be incorporated into FSAR Addendum Section 2.5.6 as part of a
forthcoming revision.
Rev. 9 241-23a