Text

Digman:A Computer Program to Illustrate the Complexities in Sampling Commercial LOW-LEVEL Waste Sites for Radionuclide Spills or Migration
	ML20091G093
Person / Time
Site:	Diablo Canyon
Issue date:	04/30/1984
From:	Michelle Simmons, Skalski J, Swannack R, John Thomas; Battelle Memorial Institute, PACIFIC NORTHWEST NATION
To:	; NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
References
	CON-FIN-B-2641 NUREG-CR-3797, NUREG-CR-3997, PNL-5028, NUDOCS 8406040139
	Download: ML20091G093 (38)
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NUREG/CR-3797 PNL-5028 i

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DIGMAN: A Computer Program to llustrate the Complexities in sampling Commercial Low-Level Vaste Sites for Radionuclide spills or Migration apared by M. A. S mons, J. R. Skalski, R. Swannack, cific Northwest Laboratory Belle Memorial Institute ucitar Regulatory D'Mg,39e4043o CR.3997 R . .PDR

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NOTICE This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability of re-sponsibility for any third party's use, or the results of such use, of any information, apparatus, product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights.

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GPO Printed copy pnce. 43.7R _

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1 May 11, 1984 '

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NOTE TO RECIPIENTS OF NUREG/CR-3797 (PNL-5028)

DIGMAN: A COMPUTER PROGRAM TO IEEUSTRATE THE COMPLEXITIES IN SAMPLING COMMERCIAL LOW-LEVEL WASTE SITES FOR RADIONUCLIDE SPILLS OR MIGRATION ,

The attached report, NUREG/CR-3797, replaces the version erroneously printed by Pacific Northwest Laboratory as PNL-5028, Interim Report.

Please discard the PNL Interim Report and replace it with the attached NRC report.

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DIVISION OF TECHNICAL INFORMATION AND DOCUMENT CONTROL U. S. NUCLEAR REGULATORY C0ttilSSION WASHINGTON, D. C. 20555

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NUREG/CR-3797 PNL-5028 DIGMAN: A Computer Program to Illustrate the Complexities in Sampling Commercial Low-Level Waste Sites for Radionuclide Spills or Migration ta u hed A r 1 Trepared by

. A. S mons, J. R. Skalski, R. Swannack, ZRC Project Manager: Dr. Ed O'Donnell fn , A 52 Pr:ptr:d for Divi 2icn of Health, Siting and Waste Management Offica cf Nuclear Regulatory Research U.S. Nuclear Regulatory Commission W=hington, D.C. 20665

,NRC FIN B2641 1

ABSTRACT DIGMAN is an interactive computer program which allows the user to sample a hypothetical waste site. Using sample results, the user is then required to

- determine the area contaminated by a waste spill or migration. The report j contains instructions for running the program and a sample session to aid the novice user. DIGMAN is programed for an Apple II computer with a minimum of 64K RAM and one disk drive. A disk containing.a copy of the program is available from the authors.

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SUMMARY

The DIGMAN program was developed to illustrate the complexities in sampling a commercial low-level radioactive waste site for spills or migration.

Monitoring for both purposes is required by 10 CFR Part 61. The site-manager (player) is given prior knowledge that a spill has occurred and subsequently migrated through or over the soil surface. In addition, the location is given for one point where some contamination is known to exist. Such an array of information may or may not be available at actual sites. The DIGMAN waste site provides the player with 1600 possible sampling sites, clearly far fewer than would actually be available. Thus, the situations depicted by DIGMAN are perhaps the simplest of the myriad of possible scenarios that might be faced by a site-manager. We invite prospective site-managers (players) to attempt the game.

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1 ACKNOWLEDGEMENTS We acknowledge the help of Rene Hinds for editorial assistance and Gail Poole in preparing the manuscript.

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CONTENTS ABSTRACT

............................... iii

SUMMARY

, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y ACKNOWLEDGEMENTS

........................... vii

. INTRODUCTION

............................. 1 SYSTEM REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . 5 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SAMPLE SESSION

............................ 9 PROBLEMS

............................... 17 REFERENCES

.............................. 19 FIGURES 1 Simulated Waste Site Used in DIGMAN . . . . . . . . . . . . . . . 3 2

Individual Program Segments Comprising the DIGMAN Menu . . . . . . 7 3 Example of Screen Display During Sample Selection . . . . . . . . 10 4 Results of an Example Session

.................. 12 5 Circle, Drawn on Waste Grid, Represents the Area the User Believes Encloses the Contaminated Area . . . . . . . . . . . . . 13 6 Results of a DIGMAN Session 1

................... 14 7

Ellipse Represents Contaminated Area . . . . . . . . . . . . . . . 15 e

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INTRODUCTION '

Hazardous waste sites of all kinds pose a major problem for the 1980's. A major difficulty at a specific site is to locate the contaminated area and determine the areal extent of contamination. It is also important to deter-mine whether the contamination has migrated off-site. One problem for the -

regulatory agencies is providing guidance on how to sample an area to deter-mine the extent of contamination. Both the expense of collecting and analyz-ing samples makes efficiency mandatory. 7 DIGMAN was developed to illustrate the difficulties in sampling a commercial radioa c ti ve low-level waste site and ultimately te evalua*. alternative sampling strategies. The extension to hazardous chemical sites is straight-f o rwa rd . DIGMAN was designed to test a site manager's ability to locate a contaminated area and to deternint its areal extent.

In the DIGMAN scenario, it is assumed that historical records or a prelimi-nary site survey indicate that contamination is present and that the highest possible concentration is ten units per area. By sanpling the site , the extent of the contamination must be determined and a decision made as to whether the contaminant has migrated off-site. Because of high la bora to ry fees, only five samples (composites) can be analyzea. Each of the five per-mitted composite samples can be compored of from one to nine component samples (i.e., you may combine up to nine samples into one sample), but cr.ly the total sample may be analyzed.

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Samples containing more than one component are termed composites. When labo-ratory costs and/or collection costs are high, compositing allows for a more extensive sampling of the waste site. Readers will find more information on '

compositing at commercial low-level waste sites in Eberhardt and Thomas (1983). Skalski and Thomas (1984) discuss some field sampling and compos- __

iting strategies that might aid in playing DIGMAN. Since site cleanup costs 4 may be very high, a site manager will want to arrive at the smallest possible estimate for the contaminated area to avoid condemning a larger area than '

neces sa ry . In the DIGMAN scenario, sampling is restricted to the waste site; however, the contaminated area may extend beyond site boundaries.

1 Several different scenarios relating to sampling and costs can bc used in N playing DIGMAN (Table 1). In scenario 1 (Table 1), costs of collecting and analyzing samples are high. For this scenario, the site manager would probably want to take the maximum number of components per composite and also take all five composite samples. In a second scenario (2), collection costs a re low, but analysis is still expensive. In this situation, the site man-ager might wish to take fewer than five composite samples, analyze the results and then resample. A third scenario would be where collecting the ,

samples is expensive while the analysis is relatively cheap, here a sampling

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' strategy similar to that usod in the first scenario might be employed.

Another scenario (4) would be where the costs for collection and analysis are 1

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I TABLE 1. Possible Scenarios for Playing DIGMAN Costs ..

Cheap Expensive 2,4 1,3 Collection 3,4 1,2 Analysis inexpensive, compositing would probably not be advantageous in this situation. ...

An additional feature of DIGMAN allows the site manager to resample af ter the ~

first sampling sequence is completed and the analytical resul ts a re available. This two or more stage sampling emulates the circumstances where laboratory turnaround is fast (and perhaps cheaper than assumed in DIGMAN) so that a much better definition of the spill area can be obtained.

The waste site is simulated as a 40 x 40 grid (Figure 1). The player is given inf orination that contamination exists at least at one point on the Wdste Site; this appears on the screen as a darkened square, and is called a PRIOR. However, the concentracion at this point is not known since in real circumstances a site manager will usually only have sketchy information.

The contaninated area is represented by an ellipse, because point spills are generally n,cved by physical forces (e.g. , wind or surf ace water). The -

ellipse is c;enerated using a bivariate normal distribution, and parameters affecting placement, orientation, and shape are randomly determined. Thus, the ellipse can be very small or large, and of varying length and widths (e.g., very " skinny" or " fat"). In addition, it is possible for part of the ellipse to be outside the defined waste site, an indication that radio-activity has moved off-site.

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WASTE SITE MAIN GRID sus-Gnip 5 PREsicTHE 8 9 SPACEBER5TO l 3RE. TURN #TO n T ETIMU W E N l

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1 A B C D E F G H FIGURE 1. Simulated Waste Site used in DIGMAN. Location of PRIOR is indicated by the darkened square at 7G/2A.

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SYSTEM REQUIREMENTS I^ ' ' ' ,.. P .-

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DIGMAN is programmed for an APPLE II computer with a minimum of 64K RAM s i ' -

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GENERAL DESCRIPTION DIGMAN is menu driven (Figure 2). After each step is completed, the menu is again shown to allow the next option to be selected.

The main segments of DIGMAN given in the menu are:

1. Introduction to DIGMAN

2. Generate Random Contaminated Area

3. Choose Sample Points on the Graph

4. Edit or Fix Incorrect Graph Points

5. Get Final Answer and Camputations

6. Exit This Set of Programs Each segment of DIGMAN is a self-cortained and accessible program. A brief description of each segment is given below.

1. Introduction to DIGMAN.

This section outlines the purpose of DIGMAN and gives detailed operating instructions. This option should always be selected when DIGMAN is run for the first time. In subsequent runs, OPTION 1 can be skipped and 0FTION 2 selected to generate the random contaminated area.

BATTELLE DIGMAN OPTION SELECTION *

[1] INTRODUCTION TO DIGMAN

[2] GENERATE RANDOM CONTAMINATED AREA

[3] CHOOSE SAMPLE POINTS ON THE GRAPH

[4] EDIT OR FIX INCORRECT GRAPH POINTS

[5] GET FINAL ANSWER AND COMPUTATIONS

[6] EXIT THIS SET OF PROGRAMS THE HIGHLIGHTED OPTION IS THE NEXT S'EP THAT YOU SHOULD LOGICALLY CHOOSE YOU CAN DO THIS BY PRESSING < RETURN >

OTHERWISE PRESS A NUMBER FROM 1 TO 1 TO END AT ANY TIME AFTER 2 PRESS 6 FIGURE 2. Individual Program Segments Compricing the DIGMAN Menu.

Each segn.ent is selected in turn to run DIGMAN.

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2. Generate Random Contaminated Area.

This program segment generates an elliptical representation of a con-taminated area and randomly chooses a point to serve as the PRIOR. The PRIOR may be at the edge or well inside the ellipse. While no input is required at this point, OPTION 2 must be selected to run the program.

To terminate the session anytime af ter selecting this option, simply select OPTION 6 (Exit) in the menu.

3. Choose Sample Points on the Graph.

In this program segment, the user samples the waste grid in an effort to define the contaminated area. A maximum of five composito samples may be taken; each sample may contain up to nine component samples.

Location of the PRIOR can be used to restrict the area sampled.

Mistakes in the choice of grid coordinates can be corrected by using menu OPTION 4 af ter < 3mpling is completed.

4. Edit or Fix i ncorrect Graph Points.

This progran segment allows correction of any input errors introduced when sample points are selected. In addition, samples (i.e.,

components) may be added or deleted.

5. Get Final Answer and Computations.

Once sampling has been completed, users should choose OPTION 5 to allow the program to compute the average concentration for each composite sample. With these data, the player is asked to define the smallest circle that .ontains the contaminated area. The program then draws the circle, computes the percentage of the contaminated area enclosed by the circle, indicates how close the radius chosen by the player was to the smallest one which could have enclosed the entire contaminated area, indicates whether an accurate prediction of off-site migration was made; and shows the actual location of the contaminated area.

6. Exit this Set of Programs.

This program segment ends DIGMAN by " zeroing cut" all the data files generated during the cur ent run. Errors will occur in subsequent runs when this option is not selected.

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SAMPLE SESSION I

This section of the report illustrates a typical DIGMAN run, step by step. _;

Before beginning, make several copies of the " waste grid" worksheets found at a the end of this manual to help you plan your sampling strategy and keep a record of your performai :e. Note that < > around a word indicates a key on ,

the APPLE keyboard tha t must b- pressed. For example, < RETURN > means press j=

the RETURN key.

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1. Turn on APPLE, insert DIGNAN disk. -d 2.

Following the introduction, a menu listing six options is shown (Figure j-2). Each option must be selected in turn to play DIGMAN. If the needed option is highlighted you may select it by pressing < RETURN >. Any =4 option may be selected by pressing the appropriate number, e.g. , <l>. a"

3. OPTION 1 - Introduction to DIGMAN $

Select this option if you have never played DIGMAN. Read through the ;-

Introduction, pressing <SPACEBAR> at the end of each page. You may look -

at some sample ellipses (spills) by pressing ~~; to return to the text, press <SPACEBAR>. At the end of OPTION 1 you will automaticall- be jy returned to the menu. --~~

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OPTION 2 - Generate Random Contaminated Area.
When i sents OPTION 2 is selected, the program generates an ellipse that repre- 15 the contaminated area at the waste site. This takes a few minutes; during this time, you should hear a ticking sound, a built-in -
indicator that the program is working. No input is required by this -g -
option. Upon completion of the option, press <SPACEBAR>.
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~~5. OPTION 3 - Choose Sample Points on the Graph.~~
y Af ter the ellipse representing the contaminated area (its size, shape, and orientation are still unknown to you), has been generated, you are _ [
ready to start sampling. Use the worksheet to map your strategy. You =4 will first be shown the PRIOR, the point on the waste grid which is ""
known to be contaminated. To see this ooint plotted cn the waste grid, press ~~; the square will be filled in. After looking at the PKIOR, --~~
~~press <SPACEBAR> to continue, . _ _~~
r The waste site in DIGMAN is represented by a 40 x 40 grid with the major vertical axis labeled from 1-8 and the horizcntal axis labeled from A-H (Figure 1). -
~~Thus, the grid is an 8 x 8 array of 5 x 5 small sauares.~~
~~You will select the smaller squares. The position of the squares are defined first by the location within the 8 x 8 array and then by the '=~~
~~i positicn within the 5 x 5 array. For example, the point 7G/2A (Figure j~~
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~~1) is found at the convergence of row 7 and column G, in the 8 x 8 array, and in row 2, column A of the 5 x 5 array.~~
You must now decide how many composite samples you wish to take. The maximum is five (remember--each composite may contain up to nine components). You will be asked to confirm the number of composites selected by pressing <Y> if the answer is correct, <N> if it is not.
After selecting the number of composites, you must select the number of components for the first composite (maximum of nine). Again you will be asked to confirm your answer.
To input the grid coordinates, first select the vertical (Y-axis) coor-dinate for the larger square, then the horizontal (X-axis) coordinate, followed by the coordinates that define the point within the larger square. Consequently each se; of coordinates will consist of a sequence of four alternating numbers and letters. You may look at the waste grid at any time by pressing ~~, to returr, press <SPACEBAR>. After entering the coordinates of a component, you will be shown its position (by a unique symbol) on the waste grid, to return to the text, press~~
~~<SPACEBARs.~~
The screen displayed during sample selection (Figure 3) contains impor-tant sampling information. It indicates which composite sample you are currently forming (Figure 3, a), as well as the component (Figure 3, b) and the total number of components in the composite (Figure 3, c). In addition, all samples will be listed (Figure 3, d).
After entering -11 rF' omponents for a particular composite, you will be asked for of components for the next composite. This pro-cess will - oil all composites have been entered. If you make a mis *- og a sample point, simply wait until all the points are ente me OPTION 4 to make corrections. Once sampling is comp. su will be returned to the menu where you may select either OPTIOi .r you wish to make corrections, or OPTION 5 to compute the concentrations and to define the contaminated area.
~~6. OPTION 4 - Eoit or Correct Graph Points.~~
In option 4, all the componert samples for each composite are listed at the top of the screen. You will be given four options. Then put in
. EDIT - press <E>
Indicate both the composite and the component number erroneously entered (selecting a component which does not exist returns you to the four options). Then put in new coordinates.
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I l DIGMAN SAMPLE LOCATION SELECTION
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ENTER GRID COORDINATES MAIN GRID VERTICAL [1-8] COMPOSITE: 1*
MAIN GRID HORIZONTAL : [A H]
sUB GRID VERTICAL (15) COMPONENT sUB GRID HORIZONTAL (A E) 1* OF 7*
press [S] TO sEE THE GRID 1* 2 3 4 5 1
2 3
4 5
6 7
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FIGURE 3. Example of Screen Display During Sample Selection. Sample-coordinates are entered in the spaces indicated. Information is provided on which composite is being formed (a), which component is being selected (b), and on the total number of components in the composite (c). . In addition, all samples will be listed (d).
. ADD - press <A>
When selecting additional samples, input the associated composite number, and the coordinates of the sample. Press <,> if you decide not to add a sample.
. DELETE - press <D>
To delete a sample, input the appropriate coraposite and component number. You will be queried to ensure that correct component, and asked to press Y (yes)you have selected the or N (no).
. QUIT - press
You will be queried to make sure you want to quit--press <Y> for yes, ~ <N> for. no. After several seconds the waste grid will be shown to illustrate the corrected samples. To continue the program
. from here, press <SPACEBAR>.
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WASTE SITE MAIN GRID s u-c r.io 5 PRE 55 THE 8 9 SPACEBOR TO 3 RETURN'Tu T E X T l.i.l H E N f RERDY 7 gi. cog
- CONCENTRATIONS o
10 = 3.95175 5 '
2 E = .96508 4 3 D = .76789 4 0 = .09035 3
5 x = 1.56536 2
PRIOR
= 7G2A 1
A B C D E F G H FIGURE 4 Results of an Example Session. Each composite is assigned a unique symbol. Average concentrations for each composite are given to the right of the waste grid.
~~7. OPTION 5 - Get Final Answer and Computations.~~
The size of this program requires that the data be loaded twice, so the concentrations (Figure 4) will momentarily disappear. After recording the concentrations on your worksheet, press <SPACEBAR>.
Now you must use your results to decide where the contaminated area is located. First, determine the point you believe has the maximum concen-tration, remembering that the maximum possible concentration is 10 units. This point should be the center of the circle you believe will i
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I encompass the spill. Input the coordinates for the center and confirm the answer.
Next, estimate the radius of the smallest circle that would enclose the entire spill. To estimate this radius, count the number of small squares either vertically or horizontally. If the perimeter of the cir-cle extends beyond the waste site boundaries, this indicates you believe the contaminated area has also gone off-site. Input the radius and press < RETURN >. To 100' at the grid before entering the radius, press
~~followed by < RETURN >. Press <SPACEBAR> to return to the program.~~
Once your circle is drawn (Figure 5), press <SPACEBAR>. The percentage 1 overlap of the circle and the contaminated area (i.e., the ellipse) will i WASTE SITE MAIN GRID sus-onio
~~-- 5 PRE 5~5 THE i 8 o 9 $PRCEBAR T~~
~~- 3 RETURN TO~~
~~" l~~
~~+ -~~
~~f TEXT WHEN ,~~
7 f g:, n, cog RERM x u b ,, CONCENTRATIONS ll 1 = 3.95175 5 "
~~1 2 =.96508 4~~
~~3 D = .76789 3 4 =.09035 5v = 1.56536 l 2~~
~~PRIOR 1 = 7G2A A B C D E F G H l~~
~~FIGURE 5. Circle, Drawn on Waste Grid, Represents the Area the User Believes Encloses the Contaminated Area. A circle which goes off-site indicates that the waste has also gone off-site.~~
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now be computed. Since these calculations take several minutes, the proportion of the circle checked for overlap with the ellipse repre-senting the contaminated area is given so that you can keep track of the program's progress.
~~The success of your sampling can be evaluated based on the following three criteria (Figure 6):~~
~~1. The proportion of the contaminated area (ellipse) within the circle (because of the algorithm used the answer may slightly exceed 100%).~~
~~2. The fraction of your chosen radius compared to the longest radius of the ellipse (this will indicate how conservative you were in your estimate of the size of the contaminated area).~~
~~3. Whether you accurately predicted that the contamination had gone off-site.~~
DIGMAN FINAL ANSWER & COMPUTATIONS l CENTER OF CIRCLE IS

8GIC RADIUS OF CIRCLE IS 6 46% OF THE ELLIPSE IS IN THE CIRCLE' YOUR RADIUS IS 43% OF THE MINIMUM RADIUS REQUIRED TO ENCOMPASS THE ELLIPSE' CIRCLE PREDICTS THAT CONTAMINATED AREA HAS GONE OUTSIDE SITE:
THIS IS CORRECT' CONTINUE WITH ELLIPSE PLOT / RESAMPLE PRESS THE [C] KEY OR THE [R) KEY FIGURE 6. Results of a DIGMAN Session. Three criteria are used to evaluate a run: 1) the percent of the contaminant ellipse within the circle; 2) fraction of the circle radius compared to the longest radius of the ellipse (indicates how conservative the estimate was of the contaminated area); and 3) whether an accurate prediction was made concerning offsite migration of the waste.
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If you press <C> at this point, the ellipse representing the contami- l nated area will be drawn (Figure 7). If you press <R>, you will be I returned to the menu where you may select OPTION 3 to resample for the contaminant spill. Press <SPACEBAR> to return to menu.
~~8. OPTION 6 - Exit This Set of Programs.~~
~~This option ends DIGMAN. The only input required is to enter the date (e.g. 10/30/84). If you make a mistake, use arrow <+> then press~~
~~< RETURN >. You may select OPTION 6 anytime after OPTION 2. To play l DIGMAN again, type RUN DIGMAN < RETURN >.~~
WASTE SITE MAIN GRID sue-cuo i - 5 F' P. E 5 5 ' T H E 8 o
~~4 SPDCEBDR Ti~~
~~- 3 RETURN TO o~~
~~7 [- f TE X T l.i.lRE N x~~
~~,ci RBCDE x~~
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* * ::: CONCENTRATIONS
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~~.:: 1 = 3.95175 ; 5 "~~
~~2 =.96508 4 3 D =.76789 3 4 2 = .09035~~
~~, 5v = 1.56536 c~~
PRIOR 1 = 7G2A A B C D E F G H FIGURE 7. Ellipse Represents Cont 6minated Area 15 1
~~- _ - - - _ - _ . _ _ _ _ . . . - ~~~
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~~. PROBLEMS j~~
~~Since we could not anticipate all the ways in which DIGMAN might be used, we cannot be responsible for its complete accuracy. We would appreciate~~
-learning of problems experienced with DIGMAN or of suggestions fer enhancing future versions. Extension of DIGMAN to other computer systems will be con-sidered as funding permits. Please send comments to :
Mary Ann Simmons Pacific Northwest Laboratory P.O. Box 999 Richland, WA 99352 (509)376-8263 17 u_ 1
1 REFERENCES Eberhardt, L. L. , and J. M. Thomas. 1983 Survey of Statistical and Sampling Needs for Environmental Monitoring of Commercial Low-Level Radioactive Waste Disposal Facilities: A Progress Report in Response to Task
~~1. .PNL-4804, Pacific Northwest Laboratory, Richland, Washington.~~
Skalski, J. R., and J. M. Thomas. 1984. Improved Field Sampling Design and Compositing Schemes for Cost Effective Detection of Migration and Spills at Commercial Low-Level Radioactive or Chemical Waste Sites. PNL-4935, Pacific Northwest Laboratory, Richland, Washington. IS
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l PNL-5028 l DISTRIBUTION No. of No. of Copies Copies 0FFSITE OFFSITE 2 U.S. Nuclear Regulatory Enrico F. Conti Comission U.S. Nuclear Regulatory Division of Technical Information Comission - and Document Control Mail Stop 1130 SS 7920 Norfolk Avenue Washington, DC 20555 Bethesda, MD 20014 Seth Coplan 2 00E Technical Information U.S. Nuclear Regulatory Comission Michael J. Bell Mail Stop 623 SS U.S. Nuclear Regulatory Washington, DC 20555 Commission Mail Stop 623 SS Patricia A. Cornella Washington, DC 20555 U.S. Nuclear Regulatory Commission Leon B. Beratan Mail Stop 1130 SS U.S. Nuclear Regulatory Washington, DC 20555 Commission Mail Stop 1130 SS Daniel Goode Washington, DC 20555 U.S. Nuclear Regulatory Comission F. N. Brenneman Mail Stop 623 SS Region 1 Washington, DC 20555 U.S. Nuclear Regulatory Comission Matthew Gordon Washington, DC- 20555 U.S. Nuclear Regulatory Comission Stephen Brocoum Mail Stop 623 SS U.S. Nuclear Regulatory Washington, DC 20555 Comission - P512 John T. Greever Washington, DC 20555 U.S. Nuclear Regulatory Comission Robert E. Browning Mail Stop 623 SS U.S. Nuclear Regulatory Washington, DC 20555 Comission Mail Stop 523~SS- Leo B. Higginbotham Washington, DC 20555 U.S. Nuclear Regulatory Comission Mail Stop 623 SS Washington, DC 20555 Distr.-1 l t _. -_ _
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1 wic rORw am u s. NucLtan a tuu. TOR v cowMisseON i t t > oa f NvMe ad '4 .va.* ** rioc *** ve' *** . .' ears LRc',', , ,,2- NUREG/CR-3797 no 3m BIBLIOGRAPHIC DATA SHEET PNL-5028 Bat INSTRuCTICNS ON Y E tRst 7 TiTLt/.N05vetiTLE , 3 LE Avt SLANE lDIGMA1: A Compu Program to Illustrate the Comp 10xities in Sa ling Commercial Low-Level Waste Sites for Radionuclide Spi s or Migration #"""""',tA, a c.ut ORis' AoM 7,. 1984 M, A. Simmons Swannack / a oaf t atPOaf issuto J. R. Skalski J. M. Thomas / "o*'" l 7 PE~#0w ING ORGA4124 TION NAME AND WADLING ADO 5 (tacsissele Cesset Afril ROJECTiT ASKMrORE uni? NUMetR 1984 Pacific Northwest Laboratory . Richland, WA 99352 '"'"*""" B2641 50 5PONSORiNG ORGANIJATION NAME AND MAILING ADORESS (sac & del apes Ita TYPE OF REPORT Division of Health, Siting and Waste anagement Offica of Nuclear Regulatory Research U. S. Nuclear Regulatory Commission *""""'""~"" Washington D. C. 20555 J2 SUPNEMA NY ARY NOTE. 13 s.55f nJ.CT (NO swords or essJ s DIGMAN is an interactive comput program whi allows the user to sample a hypothetical waste site. Usin sample results (the user is then required to d termine the area contaminat by a waste spi'1 or migration. The report contains instructions for ru ing the program anc sample session to aid the novice user. DIGMAN is programmed for an Apple II omputer with a minimum of 64K RAM and one disk driv A disk containing a y of the program is available from the authors
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~~DIGMAN I. A,,A g f. low-lov21 waste Unlimited is SECURITYCLA88tpICAfiON eTn< o.res~~
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NOTICE Software for DIGMAN may be obtained from: The National Energy Software Center Argonne National Laboratory 9700 S. Cass Avenue Argonne, IL 60439 FTS: 972-7250 Comercial (312) 972-7250
UNITED STATES ,'es"[cg Y,7sPIIo NUCLEAR REGULATORY COMMISSION ym*C WASHINGTON, D.C. 20555 n ua n. m OFFICIAL BUSINESS PENALTY FOR PRIVATE USE. $300 i 1205S5078877 1 1AN US NRC AGM-DIV OF TIDC POLICY E PUB MGT BR-POR NUREG W-501 WASHINGTON OC 20555}}

ML20091G093

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