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Appendix F - Detailed Description of Alternative 3: DoFIRI.-2o01-11 Entombment with Internal Waste Disposal Rev.a l nraft n ^ I Redlinc/Strikeout 1 2 F.2.1.2 Grout Electrical Gallery. To encase the waste and provide support for waste 3 containers to be placed in the pipe gallery above, the electrical gallery would be grouted. 4 Cement grout would be placed into the containers through a hole in the slab above and centered 5 on the container. The flowable grout to surround the containers would be placed after the 6 containers are partially filled with grout. Flowable cement grout could be obtained with a 7 strength of 14 kg/cmZ (2001b/in2). This could be pumped under low pressure, just sufficient to 8 positively fill voids and prevent shrinkage, and would provide the necessary support to the 9 second floor. Grout amendments, such as fly ash or zeolite clays, would be considered for all 10 grouting activities to reduce potential for leaching of radioactive isotopes. Grouting each 11 container as the galleries are filled would have the advantage of providing radiological shielding 12 for subsequent container placement. 13 14 Grouting around the containers would be alternated with grout placement inside the containers. 15 Grouting would be done in lifts to maintain loading on the gallery walls to an acceptable level. 16 Additional benefits of grouting in lifts are that the cargo containers would not float and the heat 17 of hydration would occur over a longer time. By limiting the grout lifts to half the gallery wall 18 height and waiting for the grout to reach adequate strength, the grouting could occur without 19 backfill in place on the wall's exterior. Grout placed around the containers would be delivered 20 into the gallery through existing rectangular openings at the edge of the floor slabs. As the grout r'21 reaches its required design strength, the engineered fill would be placed against the gallery wall 22 on the exterior of 221-U. This approach would be typical for all three galleries. 23 24 F.2.1.3 Filt Pipe Gallery with Containerized Waste. The second gallery level to be filled with 25 waste would be the pipe gallery. It is also divided into two segments by the railroad tunnel. The 26 main segment is approximately 225 m (740 ft) long. An estimated 37 waste containers would be 27 placed in this gallery in the same manner as described for the electrical gallery. An earth-fill 28 access ramp would be constructed and the end wall of the gallery would be removed. The 29 temporary cover and rollup door used for the lower level gallery would be relocated. 30 31 F.2.1.4 Grout Pipe Gallery. The pipe gallery would be grouted in the same manner as the 32 electrical gallery. Grout would be placed in the containers and around the containers in lifts. 33 The grout would be placed from the operating gallery level. 34 35 F.2.IS Fill Operating Gallery. The uppermost gallery, the operating gallery, has more room 36 available for container placement than the electrical or pipe galleries because its length is not 37 affected by the railroad tunnel. It is estimated that 40 containers would be placed in the 38 operating gallery. To access this gallery, backfill and an access ramp would have to be enlarged 39 at the south end of the gallery. 40 (^N Final Feasibility Study jor Nie Canyon Disposition lnitiasive (221-U Facility) n •l 1 F-17
..^•. , 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
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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 (0-^, (^N 1 2 3 r• • .`•
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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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(^N Appendix D- Slope Stability Ana
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Appendix G - Detailed Description o
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Appendix G- Detailed Description of
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^• ^ Appendix G - Detailed Descri
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^ ^ t"'^N 1 2 DOElRL-2001-I1 Rev. 9
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t^N (M"N Final Feasibifity Stady ja
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,.r.. . Appendix H - Detailed Descr
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(^\ Appendix H - Detailed Descripti
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Appendix H - Detailed Description o
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Appendix N- Detailed Description of
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Appendix It - Detailed Description
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(^N 5 6 7 8 9 to 11 12 13 14 15 16
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^N i ' (0-1% C Appendix H- Detailed
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Appendix H-Detailed Description of
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f^ ^ DOFJRL-2001-I I Rev. N raft Rc
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I ,.,. , ... . DOFJRI.-2001-11 Appe
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^ DOF/RL-2001-11 I Appendix I - Dec
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DOFJRI.-2001-11 I Appendix I- Decom
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^ DOFlRI.•2001-11 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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t^ ^ Appendix J-Applicable or Relev
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^ Appendia J- Applicable or Relevan
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