ML20128B497
| ML20128B497 | |
| Person / Time | |
|---|---|
| Site: | 07000371 |
| Issue date: | 06/04/1985 |
| From: | Kirk W UNC, INC. (FORMERLY UNC RESOURCES, INC.) |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 25356, NIS-85-6-3, NUDOCS 8507030257 | |
| Download: ML20128B497 (4) | |
Text
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UnC nRVAL PRODUCTS N
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'85 JllN 20 A10:09 4dM NIS-85-6-3 g,3,g g g, g g a l M. FEE MGMT. BR ANCH June 4, 1985 6
A 00CKEIQ Mr. W. T. Crow, Acting Chief estao e
e U. S. Nuclear Regulatory Commission j-3UN 11 gaj,,
Uranium Fuel Licensing Branch C
Division of Fuel Cycle and Material Safetyy-ims
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Washington, D.C.
20555 QCb c
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Subject:
Docket #70-371
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g SNM License #368 dated 2/27/85 Condition 30 Ref:
(1) Letter W. T. Crow to W. F. Kirk dated February 27, 1985 (2) Letter W. F. Kirk to W. T. Crow on subject' dated April 19,.1985
Dear Sir:
In response to telecon discussions with E. Shum and G. Bidinger of the NRC, we are submitting information concerning the disposal of our used nitric-hydrofluoric acid.
Ref (2) presented demonstration that no ex-
)
posed uranium was processed that would result in contamination of the spent acid. However, due to the minimum limit of detection in the chem-ical methods used,there was still concern on the part of the NRC that some small amount of uranium could possibly be released.
This used acid is transported off site and treated as follows:
1.
Combined with other materials in 10,000 or 20,000 gallon tanks (5 tanks).
2.
Neutralized with lime to cause n cipitation of all metal-lic tons.
3.
Vacuum filtration of the W a v'
- a. Sludge to landfill on ti 2 &. of the treater.
- b. Liquid (containing appiox. de ;,pm solids in the filtrate) to an adjacent sewer treatment plant.
4.
The mixing of UNC-NPD acids with other materials followed by neutralization, passing thru 1 of 2 vacuum filters into a common filter cake transport wagon,results in good final mixing of the solids.
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w-UnC 5.
The sludge is covered with gravel when evidence of drying is visually apparent.
Generally the sludge is covered with gravel daily during the Summer and weekly in the Winter.This covering prevents any airborne material (i.e. There is no resuspension of solids).
The dilution factors of the solids resulting from the mixing and nantralization is such that the maximum amount of uranium allowed i
(
(0.1 ppm) is reduced to below 1 picocurie per gram of material. Again, we state that we do not consider that any uranium is being released from our plant based on continuing retrospective inspection of com-ponents.
The dilution calculations are based on the following information:
Used Acid Shipments 223,000 gal /yr (Avg. 1981-84)
Density 10.lb./ gal.
Therefore, Maximum Uranium per year = 0.2231b j
(0 0.1 ppm max.)
(101 grams) f Solids Generated at Used Acid Treatment Plant Filter cake = 100 cubic yards / day (Densitye 2300 lb./ yds) 20 days / month 12 months / year - at 75% avg. use 100 x 2300 x 20 x 12 x 0.75 = 41,400,000 lb/yr.
f No allowance has been made for densification of the sludge as a re-l sult of compaction, dewatering and gravel additions.
Dilution of Potential Uranium 0.223 lb.
= 5.4 x 10-9 = 0.0054 ppm 41,4000,000 lb.
Conversion to picocuries/ gram 95% U 235 = 9.1 x 10-5 Ci/ gram Therefore, 0.0054 ppm x 9.1 x 10-5 = 4.9 x 10-13 Ci/ gram
= 0.49 picocuries/ gram s
f1C This treatment plant is owned by Envirite Corporation, Thomaston, Ct. We have visited the facility and conclude it to be a modern, well operated plant. Personnel appear conscientious and competent.
The high nitric acid content of our used acid automatically re-quires 5:1 to 10:1 dilution in each treatment batch to avoid ex-(
cessive-neutralization heat. The neutralization tanks'are fiber 91 ass resin and could be damaged by such heating. The chemical l
laboratory is well equipped for process control operations. It l
is regulated and inspected by the Connecticut Department of En-vironmental Protection.
Summarv. Any potential uranium present from the used acid would be at a level of less than 1 picocurie / gram. This possible quantity is
(
well below the guideline concern value discussed of 30 picocurie /
7.
gram.
There is no pathway for possible exposure of the public. The filter cake is constantly covered with gravel so that there is no t
I resuspension of solids to the air.The filtrate is piped to the adjacent Thomaston sewage treatment plant and eventually discharg-ed to the Naugatuck River. Any liquids in the site landfill also filter thru the underlaying gravel and enter the Naugatuck River.
No public water supplies are drawn from this river at any down-l river location.
5!E W l
W. F. KIRK Manager, Nuclear and Industrial Safety WFK/jmp cc: R. Gregg D. Luster
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