ML20217K580
| ML20217K580 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 04/01/1997 |
| From: | Edgar J SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | Chotoo S NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9708150305 | |
| Download: ML20217K580 (2) | |
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Siemens Power Corporstion
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APR 01 '97 02220Pri g . o. MOP POWDER URANIUM RECOVERY ROTARY VACUUM MLTER A Rotary Vacuum Filter (RVF) is being Installed at the Slemens Manuf acturing Plant in Richland, Washington, to remove inert solids from uranyl nitrate solution. The solids are dirt" removed from the floor during normal cleaning operations in the conversion areas. The RVF is a right circular cyllnder,18 inches in diameter and 12 inches wide, fabricated from 3/16 inch thick stainless steel using all welded construction. During operation, the cylinder rotates around a two-inch diarr eter conter shaft. The cylinder's outside edge is divided into six equally sized sections 7/8 inch deep by g.4 inches long by 12 inches wide. These sections look like small pans on the cylinder surface whose bottoms are the cylinder's outside well and whose tops are a polypropylene filter cloth. Each of these sections forms a separats small filter that has a one inch drain pipe extending from the cylinder surface to the center shaft. A coating of distemeceous earth (DE)is applied to the polypropylene cloth and de DE becomes the actual filter media for the sfurry to be flhered. During filter operation, a vacuum is applied to the filter center shaft. The vacuum extends from the center shaft through the one inch ploe drains to the separate sections at the cylinder surf ace. The cylinder is partially submerged inside a shallow tub that contain slurry to be filtered, and the cyttnder is slowly rotated. in response to the vacuum, liculd the tub panees through the DE and the polypropylene filter cloth, flows through the one inch pipe to the center shaft and then into an evacuated filtrate receiver tank. Solids in the sturry depoelt on the surface of the DE as the cylinder rotetes, a water spray washes soluble materials through the filter DE, and then air is pulled through the filter to dowater the solids deposited on the DE. The air enters the evacuated filtrate receiver tank with the Ikluid, and the alt and the liquid are separated. Air flows to a vacuum pump and the liq is pumpedfan ambient pressure filtrate collection tank. Solide deposited on the cylinder are cut off the DE surface with a knife. The solids are collected in small contain washed for additional uranium removal or if the solids uranium concentration is enough, the solids are disposed of as low level radion:tive waste. The filter cylinder interior is isolated from the center shaft and the one inch connecting piping, and is not evacuated. The cylinder is, however, a potential veld that could collec uranyl nittste solution if a leak occurs in the cylinder or the filter piping. The filter center section is filled with a silicone rubber compound thtt contains sand and boron carbide to prevent kiuld from getting into the fitter cylinder during operations, and to provide some neutron absorber to and criticality safety. i i ..}}