Solid Radioactive Waste Strategy Report.pdf - UK EPR

EPR UK
N° NESH-G/2008/en/0123
REV. A PAGE 71 / 257
FIGURE 16: CONDITIONING BY EVAPORATION
7.3.16 Conditioning Through Dewatering and Drying
Dewatering of spent resins and sludge can be performed in a disposal container which is
equipped with the appropriate dewatering internals and connections to a dewatering device.
The dewatering device applies a negative pressure to the container internals extracting all free
water [Ref. 46]. The efficiency of this technique can be increased by applying a heated jacket to
the externals of the disposal container and condensing the resulting water vapours. The end
product is a dry waste product.
Dewatered resins can either be dryed or transferred to an in drum drying facility to be
embedded in evaporator concentrate. Another option that could be explored is the
regerneration of the resins and discharge of the resins as LLW and the regenerant, following
drying as ILW for storage.
Application
· Dewatering of spent resins.
Design Data
· System throughput up to 300 litres/day;
· The system can be designed with several filling stations;
· Residual moisture of product: no free standing water.
Advantages
· In-container processing, i.e. waste is processed in-situ in the final disposal container;
· Skid-mounted units available;