ML20235M680
| ML20235M680 | |
| Person / Time | |
|---|---|
| Site: | 07000371 |
| Issue date: | 02/13/1989 |
| From: | Gregg R UNITED NUCLEAR CORP. (SUBS. OF UNC, INC.) |
| To: | Rouse L NRC |
| References | |
| 25200, NIS-89-2-6, NUDOCS 8902280365 | |
| Download: ML20235M680 (3) | |
Text
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203/848 1511 Telecopy 203/848 0022
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h U.LflVCLEAR REGutATORY 2 Mr. Leland C.
Rouse q,
Fuel Cycle Safety Bran E0gjjl0g j
Cl Wil section N
Mail Stop WF1 6H3 Div. of Fuel Cycle & Medical, & Commercial d
g Use Safety A
U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Subjects Liquid Radwaste Ref (1)
License condition #27 to SNM-368 (2)
- Letter, L.
C.
Rouse to W.
F.
Kirk, 2-17-88 (3)
- Letter, R.
J.
Gregg to L.
C.
Rouse, 5-9-88
Dear Sir:
UNC has responded to Ref. 1 by eliminating all liquid discharge to the septic field, and instead connecting to the Montville Sewer System.
UNC is now undertaking to respond to your request (Ref 2) that we discontinue discharge of radwaste to the sewer system by exploring available technologies to remove uranium from the liquids being discharged, or eliminating the contaminated liquids altogether.
Initial work in that direction was indicated in Ref.
3.
However, we have subsequently concluded that the evaporation option discussed in that letter is not the most effective system for our facility.
A significant portion of our radwaste results from metallographic sample polishing operations, resulting in sub micron particulate uranium contained in the polishing coolant water.
During a typical week, we generate some 2000 gallons of such water which contains 50
- of $ micron size abrasive, and one to two grams of uranium.
Additional uranium bearing rad waste results from rinsing containers used for laboratory chemical analysis; this uranium is primarily in nolution, anc. over the course of a year may contribute several grams to the total discharge.
We are currently ordering equipment to test the feasibility of removing particulate uranium from the waste water.
This equipment consists of a centrifuge which is fed by a conical bottom recirculation tank.
Initial tests using only polishing compound in water indicated that 10 passes through the centrifuge are required to remove 95% of the solids.
We will have to verify this removal with ra6wasta.
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UNCNavalProducts Ce~ plan to neutralise acidic wastes from'the chem Lab, and process them.through the same centrifuge system.
All centrifuged radwastes will than be collected in a tank to which a floculant will be cdded.- After an appropriate settling time, this liquid will be centrifuged as described above and sampled to evaluate uranium removal.- We expect testing to demonstrate that dispensable radioactive materials which may have been subject to settling in a cowage treatment plant will be removed from.the discharge stream by this process.
Our test equipment will consist of a raschig ring poisoned receiving tank, a 250 gallon recirculation tank, and a centrifuge.
We will collect the radwaste in the poisoned tank and sample it before releasing it to the recirculation tank.
Release will proceed only if the uranium content of the radwaste being transferred is less than 10 gas.
We will verify the representativness of the discharge cample by collecting in a safe geometry container a small portion to the radwaste being placed'into'the poisoned tank.
Subsequent transfer to the recirculation tank.is in accordance with Item 1, Table 3.9.5.1 of SNM-368.
Clarified and floculated radwaste water will be returned to the existing radwaste system described ~in Section'4.4.3 of our license.
We expect to operate this test system only for the purpose of collecting data which will provide the basis for future license submittal authorizing the final' system design and operation.
Very truly yours,
~
Q R.
Gregg Director, Technical Services RJG/jsp i
cc T. Gutman D. Luster I
l OSSPO550 A UNC Company
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