MRMTC Tabletop Workshop Reference Documents

Initial Site-Specific De-Inventory Report for Big Rock Point Report No.: RPT-3014537-002

The FuelSolutions W150 Storage Cask, shown in Figure 2-4, is a vertical storage overpack of modular precast reinforced concrete. There are eight of these Storage Casks at the BRP ISFSI, with details as follows:  The casks are 230” high with an outer diameter of 138” [11] .  The walls are 32.5” thick and consist of a 2” steel inner liner and reinforced concrete [11] .  The approximate weights of the casks are 253,200 pounds empty and up to 334,000 pounds loaded [16] .  The cask lid is 14.3” thick, 78.5” in diameter, and is constructed of steel and concrete. The lid is secured to the cask with bolts and can be handled using a horizontal lid handling fixture [11] .  The maximum surface dose rate on the outside of the loaded storage cask is 50 mrem/hr on the sides and 25 mrem/hr on the top [16] .  The storage casks can be moved horizontally using an air pad system. This system includes four air pads that are placed under the cask in between the air inlet vent openings. Once the air pads are inflated, the cask can be pushed with a modified fork truck, or similar [11] . The W74 canisters used to contain the SNF and GTCC LLW are part of the FuelSolutions System, with the canisters at BRP being the W74T class [9] . The W74 canister system has two classes; W74T, which is valid for storage and transportation, and the W74M, which is also valid for disposal. Details of the BRP W74T canisters are as follows [10] :  The canisters are 192.25” high with an outer diameter of 66”  The maximum loaded canister weight is 74,060 pounds  The canister has threaded counterbores in the top closure plate, which are used to install either a vertical lifting fixture attachment or a horizontal transfer pintle  The canister has threaded counterbores in the bottom end plate, which are used to install a horizontal transfer pintle To enable transferring a W74 canister from a storage cask to a TS125 transportation cask, the BRP ISFSI includes a transfer station. At this location, the ISFSI pad has a pit to install an impact limiter for use when down-ending a storage cask. Most of the equipment required to perform a horizontal canister transfer, listed below and shown in Figure 2-5, is located on-site [7] . A compatible transfer trailer and transfer skid are not available, therefore an alternative means of handling the transport cask during canister transfer will be needed. A skid positioning system, described in Section 2.3, could be used in place of a transfer trailer. While a transfer cask is available on-site, it is not required for direct transfer of a canister from the storage cask to the transportation cask. One consideration when doing a direct transfer of the canister at BRP is that the destination site will need to unload the canister with the TS125 cask in the horizontal orientation. If the TS125 cask is upended prior to canister removal, the canister will be upside down and not able to be handled.  Docking Collars and Related Hardware: Used to secure the storage and transportation casks during canister transfers. Depicted in Figure 2-6.

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Initial Site-Specific De-Inventory Report for Big Rock Point May 10, 2017

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