ML19309B922
| ML19309B922 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/31/1979 |
| From: | GILBERT/COMMONWEALTH, INC. (FORMERLY GILBERT ASSOCIAT |
| To: | |
| Shared Package | |
| ML19309B916 | List: |
| References | |
| NUDOCS 8004070343 | |
| Download: ML19309B922 (20) | |
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.l HYDRAULIC SURVEY THREE MILE ISLAND NUCLEAR STATION JULY 1979 l
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HYDRAULIC SURVEY THREE MILE ISLAND NUCLEAR STATION JULY 1979 TABLE OF CONTENTS Page INTRODUCTION..........................
1 METHODS AND MATERIALS......................
1 RIVER FLOW....
6 RESULTS.............................
6 CONCLUSIONS AND RECOMMENDATIONS.................
8 REFERENCES...........................
8 FIGURES 1.
General location of Cooling Tower Discharge Line 2.
Location Horizontal Control Plan 3.
Computer Generated Bottom Contours of 1978 Survey 4.
Computer Generated Bottom Contours of 1979 Survey 5.
Flow in the Susquehanna River at Harrisburg 6.
Marina Notica 7.
Newspaper Advertisement Geert/P-l
HYDRAULIC SURVEY THREE MILE ISLAND NUCLEAR STATION SEPTEMBER 1979 INTRODUCT",
On July 19, 1979, a survey was conducted in the vicinity of the Three Mile Island Nuclear Station (TMINS) cooling tower discharge structure.
The general survey area is shown in Figure 1.
The purpose of the survey was to comply with TMINS Unit 2 Environmental Technical Specifications, Section 4.3.
The purpose and scope is as follows:
"That portion of the Susquehanna River in the vicinity of cooling tower discharge structures out to the middle channel shall be monitored to determine the extent of scouring or sedimentation of the river bed that is occurring as a result of operating the Three Mile Island Nuclear Station."
METHODS AND MATERIALS The equipment utilized in the cooling tower discharge survey performed on July 19, 1979 included:
1.
One 16-foot aluminum boat with 20-hp outboard motor.
2.
One Raytheon Model DE-119 portable recording fathometer.
3.
One 600-foot, 1/16-inch diameter calibrated aircraft cable and supporting winch and boom.
4 Four styrofoam buoys with flags.
amme-5.
Four steel pipes,1 to 2 inches in diameter, 8 to 10 feet long.
6.
Signal flag.
7.
Two transits and related survey equipment.
8.
Life
- jackets, first aid
- kit, fire extinguisher, portable loudspeaker, air horn, and other equipment necessary to satisfy applicable U.S.
Coast Guard and State of Pennsylvania Water Safety Regulations.
Prior to the work, in accordance with a directive from the Pennsylvania Fish Commission Bureau of Waterways, dated April 4,1978, notification wa.s sent to the Bureau of our intentions to begin the survey.
One of the provisions of the directive was the placing of notices at all local marinas (Figure 6) and placing an advertisement (Figure 7) with the three major area newspapers describing the work involved and any inherent dangers therein.
The notices were placed prior to the work at the Tri-County
- Marina, east shore; the Marina at Goldsboro, west shore; Metropolitan Edison's picnic area, Shelly's Island; and the public picnic area and' boat launch ramp on the west shore north of the Marina.
The newspaper advertisements were run in the York Dispatch, Intelligencer Journal-New ERA (Lancaster), and the Patriot (Harrisburg) during the week of July 16, 1979.
To ensure safety of personnel, all U.S.
Coast Guard and State of Pennsylvania regulations pertaining to small boat handling were followed.
Also, extreme caution was exercised while the 600-foot tag line was extended to ensure that recreational boaters in the vicinity did not Gest /Cammmmmune i
collide with the line.
Coast Guard approved life jackets were available to all members of the survey crew and were worn by all non-swimmers and by members standing in the boat.
All safety requirements of the directive from the Pennsylvania Bureau of Waterways were followed.
Before the actual survey, on July 18, 1979, two Gilbert surveyors visited the discharge area to set horizontal control.
Figure 2 shows the location and horizontal control plan of the cooling tower discharge line survey.
The first step in laying out horizontal control was to establish the discharge pipe centerline by using the back face of the discharge wall and the actual pipe opening.
Then a radius point was ' located a distance of 29.51 feet along the back face of the discharge wall, measured from its southeast corner (see the enlarged detail on Figure 2).
The radius point consists of a 2-inch diameter steel pipe driven on shore and protruding 1-1/2 feet above ground.
A transit was then set on the radius point and a backsight taken on the back face of the discharge wall.
The transit was then turned 90,
establishing the parallel offset line.
Two surveyors range poles were placed 50 feet apart on this line behind the radius point.
The transit was then turned 45 to either side of the parallel offset and a position was established on shore conveniently behind the radius point along each 0
45 control line.
The transit was then removed from the radius point, and one instrument was placed at each position just established.
The instrumentman's sighting along these 45 control lines upstream and downstream insured horizontal control during the actual survey.
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The range line, parallel to shore, was established by measuring 15 feet out from the north-south channel radius pin and 35 feet out from the discharge survey radius point (see Figure 2).
Range line buoys were placed 100 feet apart on this line beginning 400 feet downstream of the discharge outfall.
The range buoys, as the parallel offset range buoys, consist of 1-to 2-inch diameter steel pipes driven into the river bed.
For safety and ease of sighting, a styrofoam buoy with flag was fixed to each pipe.
The horizontal control was then complete and the hydrographic survey began.
For each arc, the calibrated cable tag line was attached to the radius point and the boat was positioned at the beginning of a circular transect along the upstream side of the range line.
With the fathometer operating, a line was transcribed across the strip chart denoting the beginning of the transect.
With the boat pulling outward, the line was drawn taut, the boat then angled outward and slightly downstream, and moved slowly at a constant rate of speed toward the first 45 control line.
As the fathometer transducer, mounted aft, passed the first 45 control
- line, the instrumentman signaled the boat crew by flag and another line was transcribed across the strip chart denoting this event.
He then walked from the downstream transit to the upstream transit.
As the boat approached the parallel offset and as the transducer passed this line; that is, when the parallel offset range poles and the transducer were in line, this event was recorded on the strip chart.
The instrumentman again signaled the boat crew when the transducer crossed the downstream 45 line, and the boat crew used the Gest /Cammennesan rangeline buoys to locate the downstream range line which terminated the scan.
Bottom soundings were taken along the arc defined by radii of 50, 75,100,125,150,175, 200, 250, and 300 feet fr m the radius point.
This procedure gave good horizontal control, with five check points along each transect.
Horizontal accuracy is to 1 1 foot along the radii from the radius point and 12 feet along the arc.
The vertical control is to an accuracy of 10.5 feet.
The fathometer was field calibrated at the beginning and at the end of the day's survey.
This was done by using a surveying rod to measure the depth of water at a location where the river bottom is relatively uniform, and adjusting the fathemeter to the same depth reading.
Such field adjustment eliminates the need for theoretical adjustment of the fathometer based on water temperature, salinity, and other effects.
Because the water surface is the survey datum, the water surface elevation was recorded at the beginning and at the end of the day's survey.
Water surface elevations were obtained from the markings of the Unit 1 intake structure.
The tape records of the fathometer readings were reduced and plotted at a minimum interval of 25 feet along each arc.
All field notes and calculations used in developing the following information are on file and available for inspection in the Gilbert Associates, Inc. Reading offices.
Geert/F-
- l l
RIVER FLOW On the date of the
- survey, July 19,
- 1979, the river flow was approximately 10,670 cfs at Harrisburg, Pennsylvania, and the water surface elevation at the THINS Unit 1 river water intake structure staff gage was 277.9*.
A plot of daily flow rates in the Susquehanna River at Harrisburg is shown in Figure 5.
The stages and stage-discharge relationship at Harrisburg were furnished by the National Weather Service Federal-State River Forecast Center in Harrisburg.
At rater below about 20,000 cfs, the total river flow passes through the York Haven Head Race Channel, and no water overflows the York Haven or East Channel Dams.
Under this condition of flow, the river bed in the vicinity of the intakes and discharge is in its most stable condition.
- All elevations are in feet above Mean Sea Level.
RESULTS Figure 3 depicts the contours of last year's survey, performed on June 29, 1978.
Figure 4 shows this year's results, dated July 19, 1979.
The contours were generated by using an accepted electronic data processing surface approximation and contour mapping system.
The computer processed plots are preferred over manual contouring because of speed, accuracy, and uniformity of technique.
The computer places a grid system over the entire area specified by the data points and evaluates the data using a weighted least squares fit. Using the same mathematical technique on essentially the same data coordinates from one survey to the Gest /F-
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1 next is important for comparisons between past, present, and future survey results.
The computer program, SACM, used to generate these contours was developed by Application Consultants, Inc., and is in the current data processing library of United Cocouter Systems, Inc., of Kansas City, Missouri.
Gilbert Associates, Inc., accessed this program from our remote terminal located at Green Hills, Pennsylvania.
In the immediate vicinity of the discharge structure, it was not possible to obtain soundings because of the turbulence which interfered with the acoustic signals.
Also, it was impossible to maintain horizontal control to utilize a level rod in this turbulent area, which extended about 100 feet out from the outfall, and was about 25 feet wide.
However, there was no evidence of a sloping bottom profile adjacent to the turbulent area, and no reason to suspect that scouring existed in that area.
Because the computer generated contour plots from 1978 and 1979 were both plotted to the same scale, it was relatively easy to overlay them to detect any discontinuities, trends, or distinctive differences between the two.
The contours show that in the immediate vicinity of the discharge structure and river bank, there has been a deposition of material, resulting in an increase in bottom elevations of about 1 foot.
l Gest /F-*
The general pattern of the 1979 contours closely resembles that of last year, and in the area of the discharge plume, the differences in bottom elevation randomly vary by + 0.5 feet.
This indicates that the normal scouring and depositional effects of river flows and icing conditions, which occur each year, are more significant and widespread than any scouring effects from the discharge structure.
In other reports on the river water intake structures,(1) it is evident that the entire river bed can fluctuate by 1 foot or more because of flow conditions.
CONCLUSIONS AND RECOMMENDATIONS At the time of this survey, on July 19, 1979, there was no evidence of scouring of the river bed in the vicinity of the TMINS cooling tower discharge structure.
Also, there are no significant violations from last year's survey.
One small area in front of the discharge structure could not be monitored, but there is no reason to believe that scour exists in that area, based on upstream and downstream soundings.
If next year's survey shows no drastic changes in river bed configurations, it is recommended that this discharge survey be terminated.
REFERENCES (1) Hydrograohic Survey, Three Mile Island Nuclear Station, August 1979.
(2) Hydrograohic Survey, Three Mile Island Nuclear Station, June 1978.
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i FIGURE 5 FLOW IN THE SUSQUEHANNA RIVER AT HARRl2URG THREE MILE ISLAND NUCLEAR STATION SURVEY CONOUCTED JULY 19 73
ATTENTION BOATERS l
This notice is to inform you that on or about GILBERT ASSOCIATES, INC., an engineering firm,will be conduct-Ing a hydrographic survey in the vicinity of This work mayentall the stringing of a 3/16" wire cable from shore to a blue 16' Duronautic aluminum utility boat during the survey.The cable will be marked with orange flags every 50' and orange buoys placed in the vicinity of the work detail. For l
your own safety please use extreme caution when within the working area.This cable will not be leff unattended and will be reeled in at the completion of each days work.Thank you for your cooperation.
FIGURE 6 THREE MILE S AND NU LEAR STATION SURVEY CONOUCTED JULY 1979
Newspaper Advertisement PUBLIC NOTICE BOATERS - This notice is to inform all persons boating within the vicinity of Three Mile Island Nuclear Generating Station, Middletown, Pa., of a two-week hydrographic survey to be performed beginning in the w.,ak of July 16, 1979.
The work area will be in the Susquehanna River between Shelly's Island and Three Mile Island, directly in front of the power plant's concrete intake structures.
This work will entail the stringing of a 3/16" wire cable from the Three Mile Island shore to a blue 16 foot duranautic aluminum utility beau during the survey.
The cable will be marked with orange flags every 50 feet and orange bouys placed in the vicinty of the work detail.
For your safety, please use extreme caution within the working area.
This cable will not be left unattended and will be reeled in at the completion of each day's work.
Thank you for your cooperation.
1 FIGURE 7 t
NEWSP APER ADVERTISMENT THREE MILE ISLAND NUCLEAR STATION SURVEY CONOUCTED JULY 1979