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Appendix F- Detailed Description of Alternative 3: DoE/itt.2001-1 t
Entombment with Internal Waste Disposal Rev. e a nr•aft B
iicdlinc/Strikcout
1 F.2.1.6 Grout the Operating Gallery. The concrete slab above this gallery is much thicker
2 than the slab on top of the other two galleries, and a different method for grout placement would
3 be used. Like the ventilation tunnel grouting, angled holes would be drilled through the gallery
4 wall to grout the operating gallery. These holes would be sized and located to allow grouting
5 both inside and around the waste-filled containers.
7 F.2.2 Accept Waste for Placement Within Canyon
8
9 At the same time that the galleries are filling, waste placement would begin on the eenyee
10 epertaEingdeek canyon deck . The waste would be placed on the deck in four separate layers.
I 1 Each layer would be grouted as it is placed, and the waste placement would be completed for the
12 entire canyon length by layer prior to starting the next waste layer. Layers of waste would be
13 separated from each other by an approximately 0.75-m (2.5dt)-thick lift of grout. The grout
14 layer provides important shielding to limit operation staff exposure to radiation from the wastes
15 in the layers below. Grout amendments, such as fly ash or zeolite clays, would be considered for
16 the grout to reduce potential for leaching of radioactive isotopes. A summary of steps involved
17 for this part of Alternative 3 follows.
18
19 F.2.2.1 Modify Canyon End Walls. In preparation for waste placement in the canyon, the end
20 walls of the building must be modified. A gridwork of steel beams would be installed on both
(0**'21 the northeast and southwest end walls. This grid would be designed to resist seismic forces and
22 loads applied during the complex's operation period. For the southwest end wall, the
23 modification would include saw cutting an opening in the concrete wall. This opening would be
24 sized to accept the waste containers moved by a forklift. The opening would be covered with a
25 rollup door. The wall's steel beam gridwork would be designed to allow the rollup door to be
26 moved upwards level by level as the waste is placed within the canyon. The gridwork would be
27 anchored to the roof slab and surrounding reinforced walls. Through-bolting would connect the
28 gridwork to the unreinforced concrete end wall.
29
30 F.2.2.2 Fill Ganyon Canvon deck and Craneway with Waste. The eanyex
31 an n deck would be filled with a total of four layers of waste containers. The
32 first three layers would hold a estimated 160 cargo containers each, for a total of 480 containers.
33 The container placement would start at the northeast end of the canyon and advance towards the
34 southwest end. Each layer would be completed prior to placement beginning on the next layer
35 up. This approach would ensure that there would not be a large differential in loading of
36 adjacent building sections.
37
38 Containers would be grouted both inside the container and around their exterior. It is envisioned
39 that grouting would occur roughly every 12 m (40 ft) of building length. Containers would be
40 placed using a forklift with adequate shielding to limit operator exposure to an acceptable level.
41 The containers would be placed two abreast across the canyon deck width. In this manner, the
42 forklift could place the containers without making a 90-degree turn, which would be difficult in
i^43 the limited width of the canyon deck.
44
Final Feasibility Studyjor the Canyon Dispoiition lnitiqfive (221-U Facility)
un ?003 F-18