ML20093D142
| ML20093D142 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 10/01/1984 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0876, RTR-NUREG-876 9258N, NUDOCS 8410110117 | |
| Download: ML20093D142 (6) | |
Text
p Di 4
7 Commonwealth Edison j
) one First Nation;f PI:*n, Chic"go, litinois 5 7 '/ Addr.ss R; ply 12: P:st Offica Box 767 N
j Chicago, lilinois 60690 3:
0ctober 1, 1984'
~
Mr. Harold R.-Denton,~ Director Office ~of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Sub ject:
Byron Generating Station Units 1 and 2 Groundwater Monitoring NRC Docket Nos. 50-454 and 50-455 Reference.(a):
March 26, 1984 letter from T. R. Tramm to H. R. Denton.
Dear Mr. Denton:
.Thiu is to provide additional information regarding the monitoring of groundwater at Byron Station.- NRC review-of this information should make unnecessary License Condition 1 as contemplated in-the. Byron SER.
The information contained in the enclosed report supplements the report of-the 1983 well monitoring which was provided in reference (c).
ided for our conclusion that further groundwater-monitoring is. port is'provunnecessary to address the liquefaction issue discussed in Additional sup section 2.4.6 of the Byron SER.
Color-coded exhibits are provided at the request of the NRC Staff to. delineate the structures =and paving which have accelerated surface runoff.
Please address furtner questions regarding this matter to'this
- office.
One signed original and fifteen copies of this letter and the enclosure are provided for NRC review.
Three copies of the color-coded exhibits are provided.
Very truly yours, 1
p /2 i /.a-no u
[Y. g T. R. Tramm
, f' Nuclear Licensing Administrator f
c,f.p9 1m g
Enclosure:
" Byron Station,. Groundwater Monitoring License
-Condition, Commonwealth Edison Company," Sargent &
Lundy, September 24, 1984.
8410110117 841001 PDR ADOCK 05000 E
9258N
1 SARGENT & LUNDY Septenber 24, 1984 b.-V-tuonntens CHICAGO A
BYRON STATION GROUNDWATER MONITORING LICENSE CONDITION COFJ10NWEALTH EDISON COMPANY A program of groundwater monitoring was developed and executed to address the licensing condition cited in Section 2.4.6 Byron Safety Evaluation. Report (NUREG-08 76) on ground' water monitoring for the essential service water pipeline.
The program consisted of collecting field data from four observation wells and precipitation data from the U.
S. Weather Service.
Monitoring of the four observation wells began on April 12, 1982, and continued until December 1983.
The four observation wells were dry during the entire monitoring period.
The precipitation data for 1982~ indicates that the total rainfall at the' Byron site was 29.81 inches or 5,31 inches less than the 1931-1960 mean yearly rainfall.
The first six, months of 1982 were 5.85 inches less than the mean which the second half was 0.54 inches
. greater than the mean for the area.. The precipitation data for 1983-indicates that the total rainfall was 27.42 inches or 6.83 inches less than the prorated 1931-1960 mean yearly rainfall.
"The objective of the monitoring program was to demonstrate that the ground water levels would not rise and saturate the residual soils present above the bedrock.
Saturation of soil is of paramount importance in the e, valuation of liquefaction potential.
The data i
collected during both 1982'and 1983 indicates the groundwater level in the area of concern is less than elevation 809 feet MSL or greater than 41 feet below the elevation of 850 feet MSL at which' contingency plans may be needed.
Both the Galena group 1 of 5
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SARGENT & LUNDY t
C ^
ENGINEERS LdtCAGO i.
dolomite and soil level observation wells remain dry, thereby, providing direct evidence-that the phreatic surface is well below the pipeline elevation and that a perched groundwater condition does not exist.
It is the applica'nts position that the potentiometric map presented on FSAR figure 2.4-24 represents results of an externally recharged bedrock aquifer and, therefore, an anomalously high groundwater level.
In addition, given the same piezometric levels which occurred during 1973 and 1974 the same piezometric level, as shown on that FSAR figure, will not be attained.
This position is supported by the fact that groundwater levels within the plant site Galena dolomite aquifer were being artificially recharged through the grouting and water
~
pressure testing conducted at the power block area.
In addition surface soils were also being recharged from the site sedimentation pon'd constructed for the collection and tempor'ary retention of water runoff from the grouting operation.
In order to illustrate the consequences of the' grouting operation and the subsequent alteration of the groundwater levels, two demonstration well locations were selected.
These observation wells Gl and G8 were selected to represent bedrock areas potentially unaffected by the influx of surplus grout water.
Observation well G1 is located at the north property line while G8 is located at the south property line along
[
the west and-east border of the site.
The locations are shown on the attached exhibits A & B.
l 2 of 5 e
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CARGEtyT & LUNDY P
p-ENGINEERS CHICAGO rA e
The recorded groundwater elevations for these wells are as follows:
11/72 1/73 7/74 G-1 747.3ft 747.5ft 751.2ft G-8 769.0ft 767.3ft 774.5ft.
In each of these observation ~ wells the variation in the' measured water surface elevation amounted to a maximum cha.nge of 7+fect over
- the years of 1972 to 1974 while i'n contrast observation well P39 located at the northeast corner of the grouted foundation rock experienced the following responses:
2/73 1/73
- 7/74 4/75 P-39 787.8ft 824.'9ft 845.6ft 787.5ft The compariso'n of the Galena-Platteville aquifer observation well elevation readings of G1 and G8 with those recorded in P39 clearly demonstrate that a natural rise in groundwater given similar meteo-rological conditions would not contribute to the saturation of the residual soils along the essential service water pipeline corridor.
The second principal source of groundwater which could potentially cause soil saturation, is from perched water table conditions.
The geohydrologic conditions in the area are not conductive to the establishment of perched water table within the soils.
Specifically, surface runoff percolation through the near-surface soils and through joints and features in the near surface bedrock would negate such a possibility.
Two docketed geologic investigations were conducted recently which describe the conditions of the soil, bedrock, and structural integrity of the bedrock along the pipeline.
These reports entitled " Geologic Investigations of Solution Features and l
3 of 5 e
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SARGENT & LUNDY 2
EN GIN E E RS CHICAGO
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Confirmatory Geotechnical Investigations ESW Pipeline Corridor" support the inability of the soil to support perched water table conditions.. Therefore, the only geohydrologic condition that could possibly be postulated to create only a potential case for liquefaction is temporary saturation of the soils that may occur during and shortly after a sustained heavy rain-storm.
It is the applicants
~
position that' liquefaction will not occur due to temporary saturation because:
1.
Surface runoff is accelerated as a result of building construc-tion, paved areas and extensive perimeter ditching, thereby, reducing infiltration.
See attached exhibits A & B, 2.
absence of perched water table conditions and/or flow impending layers within the soil profile, and 3.
induction of vertical seepage patterns withi' reduction excess pore pressures to negligible icvels (Cedergren 1967 Scepage, Drainage and Flow Nets, J. Wiley & Sons, Inc., NY)
In summary, as a result of the absence of groundwater measurements during the 1982, 1983 monitoring program, which was performed in response to the SER license condition, we believe liquefaction is not a concern along the essential service water pipeline corridor.
!Two scenarios have been considered for development of saturation necessary for liquefaction to occur (1) through rise of the ground-water within the Galena Platteville aquifer and (2) from the
-development of perched groundwater conditions.
For the rise in water table within bedrock it appears the unique 1974 construction conditions heavily contributed to the artificially 4 of 5
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SARGENT & LUNDY E N G I,N C E rs S g
CHICASO
_.high groundwater. levels.
This fact can be seen by comparing onsite and offsite observation well readings for the years in question.
The secoiid condition considered was the establishment of temporary
. perched groundwater. elevations which could cause saturation.
Two attached! exhibits have been prepared which illustrate the modifica-tions to-the. runoff characteristics of the site as a result of the
. station construction, paving of roads and parking areas, and the extensive perimeter. drainage system not present during the 1974 groundwater map preparation.
The combined effect of the site cohstruction significantly reduces surface infiltration, thereby, pecjating the perched water condition and liquefaction.
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