ML20132A923
| ML20132A923 | |
| Person / Time | |
|---|---|
| Site: | 07000734 |
| Issue date: | 12/11/1996 |
| From: | Asmussen K GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER |
| To: | Gaskin C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 696-2658, NUDOCS 9612160388 | |
| Download: ML20132A923 (5) | |
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December 11,1996 696-2658 l
1 Mr. Charles E. Gaskin Licensing Section 1/ Licensing Branch i
Division of Fuel Cycle Safety and Safeguards, NMSS l
U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Docket No. 70-0734: SNM-696: Urgent Request for Off-site Disposal of Soil / Asphalt from GA's Sorrento Valley Site
Reference:
SNM-60G Amendment No. 35, " Hot Cell Decommissioning Plan Interim Approval," dated May 1,1996 j
Dear Mr. Gaskin:
I General Atomics (GA) recently removed some underground piping from the area surrounding its Building 39. Building 39 housed GA's pilot plant fuel development facility and is located on GA's Sorrento Valley site. Thorium, depleted uranium and enriched uranium was used in Building 39 during facility operations; operations were discontinued in 1995.
In the process of removing the underground piping (none of which was radiologically contaminated), GA excavated approximately 7000 ft of soil, asphalt and/or gravel from these areas. GA wishes to dispose of this material / debris at a local landfill. To demonstrate that it meets the criteria for release to unrestricted use, GA collected approximately 35 samples of soil, asphalt and/or gravel from various locations and analyzed them by gamma spectroscopy. The results were then compared to the State and NRC approved release criteria summarized in the attached table. These criteria were most recently approved as part of GA's plan for decommissioning its Hot
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Cell Facility (Ref.), and are the same as were applied to the release of: GA's SVA Fuel Fabrication Facility, GA's Experimental Building (i.e., Building 9), GA's former waste processing facility, and several other projects at GA.
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4 1A Also attached is a table which presents a summary of the results of the gamma spectroscopy analysis completed on each sample. As can be seen from the results, the uranium and thorium values are well below the criteria for release to unrestricted use. In fact, it is to be noted that the sum of the fractions using the average concentra-l tion of each nuclide and its corresponding release level is only 0.21.
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9612160308 961211 PDR ADOCK 07000734 C
PDR 3550 GENERAL AT9MICS COURT, SAN DIEGO. CA 921211194 P O. BOX 85608. SAN DIEGO. CA 92186-9784 (6191455-3000
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Mr. Charles E. Gaskin, US Nuclear Regulatory Commission December 11,1996 696-2658 Page 2 GA hereby requests authorization to release the soil, asphalt and gravel to unrestricted use so it can be disposed of as debris at the local landfill (Miramar Landfill).
GA is also, under separate cover, requesting State of California authorization to release the subject material to unrestricted use.
It is uraent to GA to obtain a favorable reolv to this reauest as soon as oossible because GA is preparing for a holiday shutdown next week and has the resources available now to efficiently and immediately dispose of this material. Your assistance in this matter is greatly appreciated, if you have any questions regarding the above, please don't hesitate to contact Laura Quintana at (63) 455-2758, or me at (619) 455-2823.
Very truly yoers, Dr. Keith E. Asmussen, Director Licensing, Safety and Nuclear Compliance Attachments: As stated in text cc: Mr. Chuck Hooker, NRC Region IV, WCFO
l Attachment to 696-2658 December 11,1996 Summary of Soil and Concrete / Asphalt Rubble Release Criteria
- Isotone Release Criteria (pCilg) l Thorium (232Th & 22sTh) 10 l
Depleted U (23 U) 35 Enriched U (234U & 2350) 30 j
NOTE: the ratio of 234U to 235U is conservatively taken to be 30, therefore the limit on the l
concentration of 235U is 1.0 pCi/g.
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- These release criteria are from NRC Policy Issue SECY-81-576, dated October 5,1981, and are in various NRC-and State of California-approved decommissioning plans of General Atomics, including the GA Hot Cell Facility Decommissioning Plan, dated November 1995.
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Attachment to 696-2658 December 11,1996 SOIL SAMPLES: SVB SOIL PILEm Page1Of2
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1 Radionuclide Concentration (Background not subtracted) l l
l SAMPLE U-238 U-235 Th-232 Th-228 Total Thorium NO.
oCVam t
oCVam t
oCVam oCVam t
oCVam
\\
OP1 4.61 1.60 0.16 0.09 1.60 0.41 0.84 0.12 2.44 0.53 OP2 3.10 1.50 0.15 0.08 1.90 0.60 3.00 027 4.90 0.87 OP3 3.30 1.50 0.02 0.09 1.80 0.47 3.10 0.42 4.90 0.89 i
OP4 520 1.90 0.17 0.13 1.80 0.63 2.80 0.43 4.60 1.06 OP5 3.80 1.60 0.17 0.02 1.70 0.48 2.50 0.37 420 0.85 0P6 2.00 1.50 0.12 1.00 1.20 0.43 1.80 0.35 3.00 0.78 OP7 1.90 1.30 0.12 0.80 0.98 0.50 1.80 0.90 2.78 1.40 OP8 5.80 1.80 022 0.10 1.70 0.70 2.30 0.40 4.00 1.10 OP9 2.30 1.40 0.12 0.08 1.40 0.25 1.60 0.60 3.00 0.85 OP10 1.70 1.00 0.14 0.09 1.40 0.35 1.70 0.36 3.10 0.71 OP11 1.90 1.30 0.18 0.08 1.11 0.44 1.99 0.75 3.10 1.19 OP12 4.10 2.00 0.18 0.11 2.00 0.49 2.30 0.40 4.30 0.89 OP13 4.10 1.70 0.22
'O.14 1.90 0.50 2.80 0.40 4.70 0.90 OP14 3.20 2.60 0.13 0.10 1.95 0.80 '
2.30 0.40 4.25 120 OP15 1.60 1.50 NO 0.88 0.30 1.80 0.50 2.68 0.80 OP16 NO 0.12 0.08 1.10 0.50 1.40 0.30 2.50 0.80 OP17 4.10 1.70 020 0.1 t 1.70 0.50 2.60 0.40 4.30 0.90 OP18 5.60 1.90 0.18 0.10 1.90 0.60 2.60 0.40 4.50 1.00 OP19 3.90 1.50 0.24 0.10 1.80 0.40 2.60 0.40 4.40 0.80 OP20 NO 0.09 0.08 1.10 0.41 1.60 0.40 2.70 0.80 0921 3.50 1.60 0.30 0.10 1.70 0.50 2.70 0.40 4.40 0.90 0P22 520 1.90 0.25 0.10 1.90 0.60 3.60 0.90 5.50 1.50 OP23 1.70 1.20 NO 0.44 0.10 0.97 0.50 1.41 0.60 OP24 2.60 1.30 0.12 0.07 1.40 0.50 2.20 0.40 3.60 0.90 OP25 520 1.90 0.24 0.10 1.60 0.50 1.00 0.10 2.60 0.60 S6-37 2.98 1.40 0.17 0.08 0.89 0.16 1.40 027 2.30 0.53 S6-38 3.90 1.70 0.14
' O.10 0.92 0.14 1.60 0.48 2.50 0.62 S6-39 4.40 1.90 026 0.1 '.
0.91 0.13 1.80 0.48 2.70 0.61 S36-41 4.10 1.90 0.14 0.10 1.01 0.15 1.80 0.60 2.80 0.75 f
$36-42 2.40 1.40 0.09 0.08 0.62 0.01 1.10 0.50 1.70 0.60 S36-43 1.80 1.30 0.11 0.08 0.45 0.12 1.30 0.80 1.75 0.92 S6-32 3.94 2.60 0.13 0.07 0.93 0.03 1.57 0.09 2.50 0.12
f, Attachment to 696-2658
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December 11,1996 Page 2 of 2 4
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S6-45 1.70' 1.10 0.10 0.09 0.40 0.06 0.90 0.41 1.30 0.47 S36-46 3.80 1.70 0.21 0.11 0.95 0.14 1.95 0.53 2.90 0.07 i
CG40m 4.44:
2.50 0.22' O.02 4.20 0.04 6.90 0.12 11.10 0.16 (Gravef, 3
t Average" 3 3.45
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0.16 1.41 l
2.12 3.53 i
AA total of-7000 ft3 of soit/ asphalt / gravel to be disposed of. The material resulted from the removal of underg i
A Maximum concentration in any one sample.
{
Sum of Fractions (background subtracted) : CG40 = U + O,0_t + [4.= Qg 35 1
10
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A Avsrage, background not subtracted.
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Avsrage: Sum of Fractions (background subtracted): Average = Q 5
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