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Appendix H - Detailed Description of Alternative 6: DoEIRI..-2001-11 ( Close in Place - Collapsed Structure Rev. 1e rift 13 M Iim/Strikceut 1 I 2001 a.131{12002 ). 1f all of the legacy equipment on the operating deck is substantially reduced 2 in size and volume for placement into the process cells, significant worker time and resulting 3 higher exposures would occur. This activity, even with latest technologies available, would be 4 performed in personal protective equipmcnt-required work areas ( i.e., contaminated areas and 5 airborne areas). SigniGcant engineering controls would be required to reduce worker exposure 6 from external and intemal exposure sources. Worker turnover could increase due to harsher 7 working conditions. 8 9 During final design, it is anticipated that emerging size and volume reduction technologies would 10 be evaluated for use. For this final FS, use of conventional size and volume reduction 11 technologies is assumed. Disassembly activities would include mechanical cutting, hydraulic 12 shearing, and manual methods. Additional technologies that could be applied are dcscribcd in 13 Appendix I. 14 15 After the equipment is in the process cells, each cell would be coated with a fixative for control 16 of loose surface contamination. Cement grout would be placed in lifts into each cell to fdl voids. 17 Each lift would be allowed to cure before placing additional lifts. As each process cell is filled, 18 the cover blocks would be placed back into position. The volume of void space to be filled 19 within the process cells is conservatively estimated as 50% of total cell volume. Therefore, the 20 grout volume needed to till the process cells is 3,400 m3 (4,400 yd). ^21 22 After the process cell cover blocks are in place, holes would be drilled through the covers, and 23 any voids under and around the edges of the blocks would be filled by pressure grouting. The 24 cover lifting bails would be removed after pressure grouting is complete. 25 26 All equipment and materials inside the operating gallery must be removed to support demolition 27 of this portion of 221-U. There is a substantial amount of piping in this gallery. Some items 28 could be Identified as reusable. Unneeded material from the gallery would be size reduced and 29 placed in ERDF boxes for disposal at ERDF. 30 materia 31 32 33 34 H.1.3.3 Demolition of ]tailtrosd Tunnel. After the railway tunnel is no longer needed, and 35 before excavating the northwest side of the canyon to allow crane access for roof removal, 36 demolition activities would begin on the railway tunnel. 37 38 The tunnel, which allowed train access into cell 3, extends approximately 46 m(150 ft) 39 westward from the northwest side of the canyon building. The tunnel is a reinforced concrete 40 structure with a soil cover about 1.5 m(5 ft) thick. 'lliere are unrcinforced wing-wall retaining 41 structures at the end of the tunnel. The tunnel is assumed to have light surface contamination 42 that can be fixed in place with fixative application. It is assumed that a backhoe with a processor r'"143 would be used for demolition. 44 Final Feasibility Stady for the Canyon Disposition Initiative (221•U Facility) )une20n3 FI-I1
Appendix H - Detailed Description of Alternative 6: DoEIiu.-2oo1-11 Close in Place - Collapsed Structurc Rev. 1e r^ 3 ^ Redlinc/Sirikggu{ 1 Demolition of the railroad tunnel would allow truck access to cell 3 without backing down the 2 long, narrow railroad tunnel. Also, part of the railroad tunnel work would be construction of a 3 truck door at the tunnel's connection to 221-U (cell 3). This door would allow access to the 4 building without disrupting ventilation of the canyon. 5 6 - er+xed-end.pessiHly 7 8 9 10 leng-3ength•waAfter cell 3 is FulFeFavaste filled with legacy equipment , it would be filled with cement grout and the cover blocks replaced. Like the other process cells, the cover blocks would be drilled and pressure grouted in place and the bails would be removed. 11 12 13 14 15 16 17 18 19 20 r'121 22 23 24 H.1.3.4 Hot Pipe Trench. The hot pipe trench is assumed to be contaminated. A review of historical photographs of the trench indicates that the trench contains intertwined, small-diameter piping. *;esto-Le&acv equinment placement is not planned for the hot pipe trench due to limited available space. Instead, the trench would be filled with grout to eliminate voids in the building structure. The initial preparation step for grouting the trench would be coating its interior surfaces with a fixative to contain surface contamination. After the coating is cured, the hot pipe trench would be grouted. Due !9 +he maze _r ^:_: _ t • , , , . The interior volume of the pipes encased by the grout is very small and therefore assumed to have no effect on the stability of 221-U. The volume of grout needed to fill the trench, 800 m3 ( 1,100 yd'), is estimated as 75% of it overall volume. The trench cover blocks would then be replaced. The cover blocks would be pressure grouted as described for the process cell cover blocks. After grouting, the bails would be removed from the hot pipe trench cover blocks. 25 26 27 28 29 30 31 32 33 34 H.13S Remove Surface Contamination. To safely enter the building during its operational phase in this alternative, contamination survey results would be used to identify where decontamination activities are needed. Contamination would either be removed or fixed to the canyon surface to reduce the dose rate and contamination risk to the lowest possible level. Water jet, water blasting, or water-flushing activities would be more difficult if completed after the process cell drain header and cells are grouted because all water would need to be collected and taken to the 200 Area's l:.iquid Effluent Remediation Facility for treatment. If any surface removal work is identified, carbon dioxide blasting or scarifying would be the preferred mcthod for its removal instead of water blasting or flushing. 35 36 37 38 After the building has bcen'surveyed and the contamination removal planned, the work would require scaffolding and wastewater collection systems to be installed and maintained, and disposal of wastewater during and after decontanmination. 39 40 41 42 r "*-, 43 44 H.13.6 Fix Contamination on 221-U Interior Surfaces. It is assumed that surface contamination on the canyon walls, #ieercanyon deck s, and ceiling can be addressed with application of a fixative. This fixative would be applied after all equipment removal and grouting in the canyon is complete. It would address loose surface contamination during the demolition of the upper half of 221-U. Final Feasrbiliry Studyjorthe Canyon Disposition Initiative (221-U Facility) Ju ne 2001 H-12
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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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. . .,.. Appendix C - Risk Modeling
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t^ Appendix C - Risk Modeling of an
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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 D-- Slope Stability Anal
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^ (00h^' ^ 2 DOFIRI^2001-I I Rev. J
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t^` ^ ^ 1 2 DOFJRL-2001-11 Rev. JDr
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Appendix E - Detailed Description o
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Appendix E- Detaiied Description of
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t^' Appendix E -Detailed Descriptio
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Appendix F - Detailed Description o
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Appendix F -Detailed Description of
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Appendix T- Detailed Description of
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(O^N Appendix F - Detailed Descript
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Appendix E- Detailed Description of
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^ (10^' (^N DOF/RL-2001-11 Rev. AjD
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