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^ I . . . Appendix G-- Detailed Description of Alternative 4: DoEIRI:2001-11 ^ Entombment with Internal and Externai Waste Disposal Rev. I Dratt 1 Redline/Strikeout l positively fill voids and prevent shrinkage, and would provide the necessary support to the 2 second floor. Grout amendments, such as fly ash or zeolite clays, would be considered for all 3 grouting activities to reduce potential for leaching of radioactive isotopes. Grouting each 4 container as the galleries are filled has the advantage of providing radiological shielding for 5 subsequent container placement. 6 7 Grouting around the containers would be alternated with grout placement inside the containers. 8 Grouting would be done in lifts to maintain loading on the gallery walls to an acceptable level. 9 Additional benefits of grouting in lifts are that the cargo containers would not float and the heat 10 of hydration would occur over a longer time. By limiting the grout lifts to half the gallery wall 11 height and waiting for the grout to reach adequate strength, the grouting could occur without 12 backfill in place on the wall's exterior. Grout placed around the containers would be delivered 13 into the gallery through existing rectangular openings at the edge of the floor slabs. As the grout 14 reaches its required design strength, the engineered fill would be placed against the gallery wall 15 on the exterior of 221-U. This approach would be typical for all three galleries. 16 17 G.2.13 Fill Pipe Gallery with Containerized Waste. The second gallery level to be filled 18 with waste would be the pipe gallery. It is also divided into two segments by the railroad tunnel. 19 The main segment is approximately 225 in long. An estimated 37 waste containers would be 20 placed in this gallery in the same manner as described for the electrical gallery. An earth-Hll 21 access ramp would be constructed and the end wall of the gallery would be removed. The 22 temporary cover and rollup door used for the lower level gallery would be relocated. 23 24 G.2.1A Grout Pipe Gallery. The pipe gallery would be grouted in the same manner as the 25 electrical gallery. Grout would be placed in the containers and around the containers in lifts. 26 The grout would be placed from the operating gallery level. 27 28 G.2.1.5 F111 Operating Gallery with Contalnerized Waste. The uppermost gallery, the 29 operating gallery, has more room available for container placement than the electrical or pipe 30 galleries because its length is not affected by the railroad tunnel. It is estimated that 31 40 containers would be placed in the operating gallery. To access this gallery, backfill and an 32 access ramp would have to be enlarged at the south end of the gallery. 33 34 G.2.1.6 Grout the Operating Gallery. The concrete slab above this gallery is much thicker 35 than the slab on top of the other two galleries, and a different method for grout placement would 36 be used. Like the ventilation tunnel grouting, angled holes would be drilled through the gallery 37 wall to grout the operating gallery. These holes would be sized and located to allow grouting 38 both inside and around the waste-filled containers. 39 40 G.2.2 Emplace Waste In 221-U Canyon 41 42 At the same time that the galleries are being filled, waste placement would begin on the eanyen 143 eperating an on deck. The waste would be placed on the dcek in four separate layers. 44 Each layer would be grouted as it is placed, and the waste placement would be completed for the 45 entire canyon length by layer prior to starting the next waste layer. Layers of waste would be Fiaa( FeasibUiq S7adyfw the Canyon Ditposidoa Initiative (221-1/FacNiry) )une?0()3 G-17
.. . .,. .. . Appendix G- Detailed Description of Alternative 4: DoEIRt.-2003-11 Entombment with Internal and External Waste Disposal Rev. l DraftJ RedlinrlStrikeout I separated from each other by an approximately 0.75-m (2.5-ft)-thick lift of grout. The grout 2 layer provides important shielding to limit operation staff exposure to radiation from the wastes 3 in the layers below. Grout amendments, such as fly ash or zeolite clays, would be considered for 4 the grout to reduce potential for leaching of radioactive isotopes. A summary of steps involved S for this part of Alternative 4 follows. 6 7 G.2.2.I Modify Canyon End Walls. In preparation for waste placement in the canyon, the end 8 walls of the building must be modified. A gridwork of steel bcams would be installed on both 9 the northeast and southwest end walls. This grid would be dcsigned to resist seismic forces and 10 loads applied during the complex's operation pcriod. For the southwest end wall, the 11 modification would include saw cutting an opening in the concrete wall. This opening would be 12 sized to accept the waste containers moved by a forklift. The opening would be covered with a 13 rollup door. The wall's steel beam gridwork would be designed to allow the rollup door to be 14 moved upwards level by level as the waste is placed within the canyon. The gridwork would be 15 anchored to the roof siab and surrounding reinforced walls. 71rough-bolting would connect the 16 gridwork to the unreinforced concrete end wall. 17 18 G.2.2.2 Fill Ganyan Canvon deck and Craneway with Waste. The eaxyen 19 canvon deck would be filled with a total of four layers of waste containers. The 20 first three layers would hold a estimated 160 cargo containers each, for a total of 480 containers. 21 The container placement would start at the northeast end of the canyon and advance towards the 22 southwest end. Each layer would be completed prior to placement beginning on the next layer 23 up. This approach would ensure that them is not a large differential in loading of adjacent 24 building sections. 25 26 Containers would be grouted both inside the container and around their exterior. It is envisioned 27 that grouting would occur roughly every 12 m (40 ft) of building length. Containers would be 28 placed using a forklift with adequate shielding to limit operator exposure to an acceptable level. 29 The containers would be placed two abreast across the canyon deck width. In this manner, the 30 forklift could place the containers without making a 90-degree turn, which would be difficult in 31 the limited width of the canyon deck. 32 33 As part of the grouting effort, a 0.75-m (2.5-ft)-thick layer of grout would be placed on top of the 34 filled containers. This layer would act as both shielding and a working surface for the next layer 35 of containers. Grout amendments, such as fly ash or zeolite clays, would be considered for the 36 grout to reduce potential for leaching of radioactive isotopes. In the final design, a reinforced 37 concrete slab may be installed as the top section of the grout layer. The concrete slab provides a 38 smoother surface for operation of the forklifts during waste placement of the next layer. The 39 grout, or possibly reinforced concrete slab, would be designed for the whccl loads of the forklift. 40 41 The next waste placement would be inside the craneway. An opening in the southwest end wall 42 would be cut to provide access to the cranaway. Guide rails would be installed and cargo (-,\43 containers delivered into the craneway similar to waste placement in the galleries. 44 Approximately 39 containers could be placed in the craneway. The containers would be grouted 45 inside and out as was done in the galleries. Final Feasibility Study jor Jhe Canyon Disposition )nitiativt (22 )-U Facility) ^ Ivte 1!tL^ G-18
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AR TARGET SHEET The following docum
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(^N r^ r Proposed Plan for the Cany
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^ (^N t^ the steHitFths+amedielaeti
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o"N DOF/RIr2001-29 Draft D Redline/
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(^N i0,"% / ' DOF/RL-2001-29 Draft
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I f^ ^ DOE!RL-2001-29 Ikaft D Redli
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! ' t^ Project Prepare the existing
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f ' ^ rN 100 I Noise, Visual, and A
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^ POINTS OF CONTA CP ^ U.S. Drnartm
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f^ n DOF/RL-2001-29 Draft D Redlinc
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noFIRL-2001-11 Rev. p 1 1)raft P ^
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^ ^ 1 2 DOFJRL-2001-11 Rev.A 1 Dra(
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. . .,.. Appendix C - Risk Modeling
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t^ Appendix C - Risk Modeling of an
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(_^% ^ ^ 11 Appendix C - Risk Model
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(0"% t^ DOFJRL-2001-1 l Rev. N 1 Dr
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1 ' ^ ^ DOEJRL-2001-1 t Rev.H1 nraf
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Appendix D- Slope Stability Analysi
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Appendix D - Slope Stability Analys
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^ Appendix D-- Slope Stability Anal
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Appendix E - Detailed Description o
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Appendix F - Detailed Description o
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^ DOF/RL-2001-11 I Appendix I - Dec
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^ r^, TABLES DOFJRIr2001-11 • Rev
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^ Appendix J- Applicable or Relevan
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