![]() The decanted supernate is filtered through a sand filter and returned to the basin. After a prescribed settling period the supernate is decanted. The slurry is allowed to settle within the STSC to concentrate the solids and clarify the supernate. In summary, the ECRTS retrieves sludge from the engineered containers and hydraulically transfers it as a slurry into an STSC positioned within a trailer-mounted STS cask located in a Modified KW Basin Annex. A detailed description of the origin of sludge and its chemical and physical characteristics can be found in HNF-41051, Preliminary STP Container and Settler Sludge Process System Description and Material Balance. The settler tank sludge consists of sludge generated by the washing of KE and KW Basin fuel in the Primary Clean Machine. The KE and KW Basin sludge consists of fuel corrosion products (including metallic uranium, and fission and activation products), small fuel fragments, iron and aluminum oxide, sand, dirt, operational debris, and biological debris. The purpose of the cost estimate is to provide a comparison of the two concepts described. The STSC is closed, and placed in storage arrays in the T Plant canyon cells for interim storage. ![]() The CTO and STC are opened and the small canisters are removed using the canyon crane and placed into an STSC. At T Plant, the CTO is removed from the transport trailer and placed on the canyon deck. The STC is raised from the basin and placed into the Cask Transfer Overpack (CTO), loaded onto the trailer in the KW Basin Annex for transport more ยป to T Plant. ![]() The small canisters are then transferred to the existing Fuel Transport System (FTS) where they are loaded underwater into the FTS Shielded Transfer Cask (STC). After settling and decanting, the sludge is loaded underwater into small canisters. (2) Small Canister Concept - In the small canister concept, the sludge is transferred from the Engineered Containers (ECs) into a settling vessel. The STSC is then transported to T Plant and placed in storage arrays in the T Plant canyon cells for interim storage. The sludge is loaded via a series of transfer, settle, decant, and filtration return steps until the STSC sludge transportation limits are met. The two design concepts under consideration are: (1) Hydraulic Loading Concept - In the hydraulic loading concept, the sludge is retrieved from the Engineered Containers directly into the Sludge Transport and Storage Container (STSC) while located in the STS cask in the modified KW Basin Annex. The Sludge Treatment Project (STP) is considering two different concepts for the retrieval, loading, transport and interim storage of the K Basin sludge.
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