ML19206B307
| ML19206B307 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/31/1978 |
| From: | Gilbert Associates, Metropolitan Edison Co |
| To: | |
| Shared Package | |
| ML19206B305 | List: |
| References | |
| EMR-780630, NUDOCS 7905080528 | |
| Download: ML19206B307 (15) | |
Text
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HYDRAULIC SURVEY THREE MILE ISLAND NUCLEAR STATION JUNE 1978 79050805E8
-Prenared by -
Gilbert Associates, Inc.
Reading, Pennsylvania 23 073 AUGUST 1978
HYDRAULIC SURVEY THREE MILE ISLAND NUCLEAR STATION JUNE 1978 TABLE OF CONTENTS I
PAGE INTRODUCTION.........................................................
1 METHODS AND MATERIALS................................................
1 RIVER FLOWS....................
5 RES ULTS.....
5 CONCLUSIONS.......................
7 REFERENCE......................................
7 FIGURES 1.
General Location of Cooling Tower Discharge Line.
2.
Location Horizontal Control Plan and Bottom Contours.
3.
Computer Generated Bottom Contours.
4.
Flow in the Susquehanna River at Harrisburg.
5.
Marina Notice 6.
Newspaper Advertisement 23 074 Geert /Commonweae
HYDR \\ULIC SURVEY THREE MILE ISLAND NUCLEAR STATION JUNE 1978 INTRODUCTION On June 29, 1978, 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 TMI 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 June 29, 1978, 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 aircraf t cable and supporting winch and boom.
- 4) Four styrofoam buoys with flags.
- 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.
2,3 0 7 5-GJbert /Commoc*eae Prior to the work, a permit for the survey was applied for with the Pennsylvania Fish Cocaission Bureau of Waterways. Gilbert Associates, Inc. received a letter of approval from the Bureau Director, Ccpt. Charles E. Leising in April 1978.
One of the provisions of their approval.as the placing of notices at all local marinas (Figure 5) and advertisements in the three major area newspapers (Figure 6) denoting the work involved and inherent dangers therein.
These papers were: The York Dispatch, Intelligencer Journal-New Era (Lancaster) and The Patriot (Harrisburg).
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 collide with the line.
Coast Guard approved life jackets were available to all mc=bers of the survey crew and were worn by all nonswi=mers and by members standing in the boat.
All safety requirements of the Pennsylvania Bureau of Waterways permit were followed.
Before the actual survey, on June 15, 1978, 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 norizontal 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 f ace of the discharge wall, measured from its southeast corner, (see the enlarged detail on Figure 2 ). The radius point consists of a 20-inch diameter steel pipe driven on shore and protruding i feet above ground.
This radius point will be used for all future surveys.
23 076 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 parallel offset range buoys were set along this line, about 50 feet apart, the first one being 500 feet out from the radius point.
The transit was then turned 45 degrees to either side of the parallel offset and a position was established on shore conveniently behind the radius point along each 45 degree control line. The transit was then removed from the radius point, and one instrument was placed at each position just estab-lished. These transits sighting along the 45 degree control lines upstream and downstream insured horizontal control during the actual survey.
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 saf ety and ease of sighting, a styrofoam buoy with flag was fixed to the pipe.
The horizontal control was now complete and the hydrographic survey began. For each arc, the calibrated cable tag line was attached to the radius point and the boat 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 degree control line.
As the f athometer transducer, mounted af t, passed the first 45 degree control line, the instrumentman signaled the boat c*ew by flag and another line was transcribed across the strip chart denoting this stert emmue 23 077 event.
He then walked from the downstream (D.S.) transit to the upstream (U.S.)
transit. As the boat approached the parallel offset and as the transducer passed this line, that is, when the parallel offset range buoys and the transducer were in line, this event was recorded on the strip chart.
The instrumentran again signaled the boat crew when the transducer crossed the down-stream 45 degree line, and the boat crew used the rangeline buoys to locate the downstream range line which terminated the scan.
Bottom soundinCs were taken along the arcs defined by radii of 50, 75, 100, 150, 200 and 300 feet from the radius point.
This procedure gave good horizontal control, with five check points along each transect. Horizontal accuracy is to i 1 foot along the radii from the radius point and 1 2 feet along the arc.
The vertical control is to an accuracy of i 0.5 feet.
The fathometer was field calibrated at tha beginning and at the end of the day's su rvey. This was done by using a surveying rod to measure the depth of wat2r at a location where the river bottom is relatively uniform, and adjusting the fathometer 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 datus, 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 on 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.
23 078 G.m /Ccmmonweae 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.
N_
RIVER FLOW On the date of the survey, June 29, 1978, the river flow was approximately 14,850 cfs at Harrisburg, Pennsylvania and the water surface elevation at the 7
TMINS Unit 2 river water intake structure staff gage was 278.4*.
A plot of daily flow rates in the Susquehanna River at Harrisburg is shown in Figure 4 J
The stages and stage-discharge relationship at Harrisburg were furnished by the
=;
National Weather Service Federal-State River Forecast Center in Harrisburg.
4 At rates below about 20,000 cfs, the total river flow passes through the York 4
Haven Head Race Channel, and no water overflows the York Haven or East Channel
?
j Dams. Under this condition of flow the river bed in the vicinity of the intakes and discharge is in its nost stable condition.
=
- All elevations are in feet above Mean Sea Level.
7 RESULTS 3
Figure 2 shows the bottom contours as interpreted by a senior draftsman 3
experienced in topographic data reduction.
Figure 3 depicts the contours 2
generated by using an accepted electronic data processing surface approximation 3
and contour mapping system. The computer program, SACM, used to generate these contours was developed by Application Consultants, Inc., and is in the 8
current data processing library of United Computing Systems, Inc., of Kansas City Missouri. Gilbert Associates accessed this program from our remote
=
~
terminal located at Green Hills, Pennsylvania.
3 23 079 I
The basic difference between the manual and computer method of contouring is in the data interpretation.
In each case, a data point is defined by x - y location coordinates with a corresponding a value.
A draftsman plotted all data points and linearly interpolated between adjacent points. The computer, however, placed a grid system over the entire rectangular area specified by the minimum and maximum coordinate values.
It then evaluated each grid inter-section point using a weightad least squares fit and drew the contours according to these grid values. A comparison of both figures shews them to be in close agreement with some slight deviation in the outer boundaries. The advantages of utilizing the computer routine are speed, accuracy, and uniformity of technique. The latter is important for comparisons between future plots.
From the bottom contour plots shown in Figures 2 and 3, there was no obvious area of scour at or near the TMINS cooling tower discharge structure.
In the i= mediate 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 ta utilize a level rod in this area, which extended about 100 ft. out from the outfall, and was about 25 ft, wide. However, there was no evidence of a sloping bottom profile adjacent to the turbulent area, and no reason to suspect scouring existed in that area.
The normal scouring ef fects of high river flows, which occur each year, would seem to be much more significant and widespread than any scouring effects rf the discharge structure.
In other reports on the river water intake struc-tures (1), it is evident taat the entire river bed can fluctuate by 1 foot or more because of flow conditions. No such variation in bottom elevation was evident from the cooling tower discharge structure survey.
'),
O L J.
U G,wt /Commonwerth i.,. -.
- S 4
CONCLUSIONS At the time of t his survey, on June. 29, 1978, there was no evidence of scouring of the river bed in the vicinity of the T'IINS cooling tower discharge structure.
Although one small area could not be renitored, there was no reason to believe that scour existed in that area, based on upstream and downstream soundings.
REFERENCE 1Hvdrographic Survey, Three Mile Island Nuclear Station, June, 1978.
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23 087 3
F!GURE 4 FLOW IN THE SUSQUEHANNA RIVER AT HARRISBURG THREE MILE ISLAND NUCLEAR STATION JUNE 1978
ATTENTION BOATERS 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 o blue 16' Duranautic 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 yourown safety please use extreme caution when within the working area.This cable will not be lef t unattended and will be reeled in at the completion of each days work.Thank you for your cooperation.
FIGURE 5 THREE MILE SL ND NUC EAR STATION JUNE 1978
ilewspaper Advertisement PUBLIC fiOTICE BOATERS - This notice is to inform all persons beating within the vicinity of Three Mile Island fluclear Generating Station, Middletown, Pa., of a two-week hydrographic survey to be performed beginning in the week of June
, 1973.
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 aluminun utility boat 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 comoletion of each day's work.
Thank you for your cooperation.
23 089 23 %3B FIGURE 6 NEWSPAPER ADVERTISMENT THREE MILE ISL AND NUCLE AR STATION JUNE 1978