ML20206M917

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Informs That NRC Completed Development of 3D Geospatial Model of Ash Lagoon to Get Better Understanding of Distribution of U-235.Encl 1 Describes Each Illustration in Encl 2
ML20206M917
Person / Time
Issue date: 05/11/1999
From: Nelson R
NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To: Kossak R
AFFILIATION NOT ASSIGNED
Shared Package
ML20206M921 List:
References
REF-WM-3 NUDOCS 9905170081
Download: ML20206M917 (30)


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NUCLEAR REGULATORY COMMISSION

't WASHINGTON, D.C. 20555-0001

%, *****,o May 11, 1999 Mr. Robert N. Kossak, Manager Kiski Valisy Water Pollution Control Authority 1200 Pine Camp Road Leechburg, PA 15656

SUBJECT:

CONTAMINATED SLUDGE ASH LAGOON AT THE KISKI VALLEY WATER POLLUTION CONTROL AUTHORIT / TREATMENT FACILITY

Dear Mr. Kossak:

In my letter to you dated March 17,1999, you were updated on the status of the U.S. Nuclear Regulatory Commission (NRC) staffs activities related to the contaminated sludge ash lagoon at the Kiski Valley Water Pollution Control Authority (KVWPCA) treatment facility. Also in that letter, I reported that we were studying the sampling data collected by the Oak Ridge institute for Science and Education in 1994, and the recent data collected by B. Koh and Associates. With regard to this data, we have completed the development of a 3D geospatial model of the ash lagoon to get a better understanding of the distribution of the uranium-235. Twenty illustrations generated using this model are enclosed for your information (Enclosures 1 and 2). Enclosure 1 describes each of the illustrations in Enclosure 2. I trust that you and your consultants will find this information to be helpful. We have the option of providing an interactive demonstration of the model using a portable laptop. Please let me know if you would like such a demonstration, and I will schedule a meeting at your facility.

in addition, my March 17,1999, letter discussed interim guidance for conducting dose assessments (Enclosure 3). M/e are also developing a decommissioning standard review plan (SRP), consistent with our new License Termination Rule, to enable NRC staff to evaluate decommissioning information submitted by licensees in a timely, efficient, and consistent manner. The SRP can also be used as a contents guide for those developing decommissioning /remediation plans. The SRP is being developed in modules.

Draft versions of these modules will be placed on the Web as they are developed. The Web address is: http://techconf.llnl. gov /cgi-bin / library? source =*& library =Lic_ Term _ lib & file =* Finally, we are developing site-specific guidance for the development of a remediation plan for the ash lagoon. We hope to have this guidance completed by mid-June, consistent with our SRP development schedule.

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.ii-May 11, 1999 R. Kossak If you have any questions, please call me at (301) 415-7298.

Sincerely,

[ Original signed by:]

Robert A. Nelson, Chief

.j Special Projects Section Decommissioning Branch Division of Waste Management Office of Nuclear Material Safety and Safeguards

Enclosures:

1. Description of Ash Lagoon illustrations
2. Ash Lagoon lilustrations
3. Interim Dose Assessment Guidance cc: R. Maiers, PADEP D. Shearer, PADEP T. Adams, B. Koh & Assoc.

TICKET NO.: N/A DISTRIBUTION: Central File DCB r/l NMSS r/f RJohnson RBellamy RNeel GStirewalt JGreeves PUBLIC DOCUMENT NAME: S:\\DWM\\DCB\\RAN\\KISKl2-LTR.WPD

  • See previous concurrence.

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l If you have any questions, please call me at (301) 415-7298.

l-l Sincerely, j

[ Original signed by) l Robert A. Nelson, Chief I

Special Projects Sectiop Decommissioning Branch l

Division of Waste Manageme i

Office of Nucleaf Material ety uards l

and Safeg/

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Enclosures:

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1. Description of Ash Lagoon f

Illustrations

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2. Ash Lagoon Illustrations l
3. Interim Dose Assessment Guidance cc: R. Maiers, PADEP D. Shearer, PADEP T. Adams, B. Koh & Assoc.

TICKET NO.: N/A

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DISTRIBUTION:

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ENCLOSURE 1 l

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DESCRIPTIVE NOTES ON FIGURES DERIVED FROM THE NRC THREE-DIMENSIONAL (3D)

GEOSPATIAL MODEL OF THE KISKI ASH LAGOON l

Note: Sample holes are labeled in the 3D geospatial model of the Kiski ash lagoon relative to their locations in the lagoon sampling grid. Designations "O" and "K" are used with sampling j

grid coordinates to indicate whether samples and measured activities for total U were provided, I

respectively, by ORISE (1995 data) or KOH Engineering (1998 and 1999 data). For example, sample hole 45050K, located at coordinates 45N,05E ("4505") in the sampling grid, was sampled and analyzed to determine activity from total U by both ORISE (*O") and KOH ("K").

1. Figure: " Lagoon Surface and Total Lagoon Volume" Two-dimensional (2D) map view of the surface of the Kiski ash lagoon 3D geospatial model with the lagoon boundary outlined in red. Sample hole locations in the lagnon sampling grid are labeled in black. Sampling grid origin "0000" (defined by sampling grid coordinates 00N,00E) is the position of sample hole 00000 and located at the lower i

right corner of the figure. From this point of origin, "N" sampling grid lines are measured i

l in meter spacings up to the left and "E" grid lines in meter spacings up to the right.

l The lagoon ill pipe was located in the lower left corner of this figure near sample hole l

70000. Total volume of ash in the lagoon (8953.43 m') was calculated from the 3D model and includes ash with measured activity levels for total U ranging from <30 to

>800 pCi/g. Most of the lagoon surface is covered by ash material having a measured activity for total U <30 pCi/g, with several smaller areas between 30-100 pCi/g and one area at sample hole 2080K between 100-200 pCi/g.

2. Figure: " Oblique View of Lagoon Surface and Total Volume" Oblique view of the surface of the Kiski 3D geospatial model showing isoshell pattems which indicate variations in activity for total U in the ash lagoon.

Note the position of "70" on the model axis marking 70N in the sampling grid. The lagoon fill pipe was located in the foreground corner of the model near sample hole 70000. The model has been realistically constrained around its periphery by the boundary of the lagoon (using the boundary depicted on the 1994 map of the ash lagoon surface from Chester Environmental); at its top by topography of the lagoon surface (with l

this upper clipping surface developed from information on the 1994 Chester map, in combination with data collected in 1995 by ORISE and in 1998-1999 by KOH); and at its bottom by the bottom of the lagoon (with this lower clipping surface generated from depth data provided by KOH in 1999, in combination with information from the 1994 Chester map of the ash lagoon surface).

3. Figure: " Oblique View of Lagoon Bottom and Total Volume" Oblique view of the bottom of the Kiski 3D geospatial model showing isoshell patterns which indicate subsurface variations in measured activity for total U in the ash lagoon.

Bottom of the lagoon is defined by depth data provided by KOH in 1999, in combination with information from the 1994 Chester map of the ash lagoon surface.

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4. Figure: " Volume <30 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U <30 pCi/g. The volume calculated for this isoshellis 4,375.11 m Sample hole 45050K is shown. This hole contained the maximum measured activity from total U of 922.85 pCi/g at an elevation range between 239.872-239.737m (i.e., a depth range of 1.225-1.300m) in the lagoon. The lagoon fill pipe was located at the J

foreground corner of the model.

5. Figure: " Total Volume >30 pCi/g" Kiski 3D geospatial model isoshells for material in the ash lagoon with a measured activity from total U >30 pCi/g. The volume calculated is 4,578.32 m Sample hole I

45050K is also shown for reference.

The lagoon fill pipe was located at the left corner of the model near sample hole 70000, and hence north of hole 45050K in the sampling grid. Note the position of "70" on the model axis marking 70N in the sampling grid.

6. Figure: " Volume 30-100 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U between 30 and 100 pCi/g. The volume calculated is 2,678.48 m.

Sample hole 45050K is also shown for reference.

7. Figure: " Volume 100-200 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured 2

activity from total U between 100 and 200 pCi/g. The volume calculated is 772.96 m Sample hole 45050K is also shown for reference.

8. Figure: " Volume 200-300 pCilg" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U between 200 and 300 pCi/g. The volume calculated is 454.34 m'.

Sample hole 45050K is also shown for reference.

9. Figure: " Volume 300-400 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U between 300 and 400 pCi/g. The volume calculated is 290.21 m' Sample hole 45050K is also shown for reference.
10. Figure: " Volume 400-500 pCilg" 3

The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured 3

activity from total U between 400 and 500 pCi/g. The volume calculated is 158.31 m Sample hole 45050K is also shown for reference.

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11. Figure: "Vo!ume 500-600 pCi/g" 1

The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured l

activity from total U between 500 and 600 pCi/g. The volume calculated is 93.95 m Sample hole 45050K is also shown for reference.

12. Figure: " Volume 600-700 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U between 600 and 700 pCi/g. The volume calculated is 69.00 m.

3 Sample hole 45050K is also shown for reference.

13. Figure: " Volume 700-800 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U between 700 and 800 pCilg. The volume calculated is 42.38 m Sample hole 45050K is also shown for reference.
14. Figure: " Volume >800 pCi/g" The Kiski 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U >800 pCi/g. The volume calculated is 18.69 m. Sample hole 3

45050K is also shown for reference.

15. Figure: " Volume >800 pCi/g" (illustrated in framework of the total lagoon model)

The Kiskt ash 3D geospatial model isoshell for material in the ash lagoon with a measured activity from total U >800 pCilg. The volume calculated is 18.69 m. Sample 3

hole 45050K is also shown for reference.

This figure shows the volume relative to the framework for the total Kiski ash lagoon model. The fill pipe for the lagoon was located in the lower left corner of the model near sample hole 70000. Note the position of "70" on the model axis marking 70N in the sampling grid.

16. Figure: " Total Volume in a 1m Slice Containing Hole 45050K" 2

Total volume of ash calculated for this slice,115.94 m, includes ash with measured activity levels for total U ranging from <30 to >800 pCilg. The figure illustrates a capability of EV software to define volumes and associated activity ranges in slices of specified thickness for excavation planning purposes.

j Edges of this 1-meter thick slice are defined by the following coordinates in the Kiski ash l

lagoon sampling grid: 0005 (i.e., 00N, 05E), 7005 (70N, O5E), 7006 (70N, 06E), and 0006 (00N,06E). Figures 17 through 20 illustrate a 1x10-meter segment of this slice in which volumes of materials are calculated for specific activity ranges.

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17 Figure: " Total Volume in a 1x10m Slice Containing Hole 45050K" Total volume (18.61 m ) calculated in a 1x10m segment of the 1m-thick slice from the Kiski 3D geospatial model (See Figure 16) includes ash with measured activity levels for total U ranging from <30 to >800 pCi/g.

Edges of this segment are defined by the following coordinates in the Kiski ash lagoon sampling grid: 4005 (40N, 05E), 5005 (50N, 05E), 5006 (50N, 06E), 4006 (40N, 06E).

18. Figure: " Volume <30 pCi/g in a 1x10m Slice Containing Hole 45050K" Volume (7.10 m ) calculated in a 1x10m segment of the im-thick slice from the Kiski 3D geospatial model(See Figure 16) for ash with a measured activity f::::n total U <30 pCi/g.

Edges of this segment are defined by the following coordinates in the Kiski a3.,h lagoon sampling grid: 4005 (40N, 05E), 5005 (50N, 05E), 5006 (50N, 06E), 4006 (40N, 06E).

19. Figure: " Volume >30 pCi/g in a 1x10m Slice Containing Hole 45050K" 3

Volume (11.51 m ) calculated in a 1x10m segment of the im-thick slice from the Kiski 3D geospatial model (See Figure 16) for ash with a measured activity from total U >30 pCilg.

Edges of this segment are defined by the following coordinates in the Kiski ash lagoon sampling grid: 4005 (40N,05E),5005_(50N,05E),5006 (50N,06E),4006 (40N,06E).

20. Figure: " Volume >800 pCi/g in a 1x10m Slice Containing Hole 45050K" 3

Volume (0.45 m ) calculated in a 1x10m segment of the im-thick slice from the Kiski 3D geospatial model (See Figure 16) for ash with a measured activity from total U >800 pCi/g.

Edges of this segment are defined by the following coordinates in the Kiski ash lagoon sampling grid: 4005 (40N, 05E), 5005 (50N, 05E), 5006 (50N, 06E), 4006 (40N, 06E).

NOTE: All 3D geospatial models were constructed and volumes calculated on a UNIX-based Silicon Graphics workstation using EarthVision (EV) 3D geospatial modeling software from Dynamic Graphics, Inc. of Alameda, CA.

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