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Appendix G - Detailed Description of Alternative 4:
^ Entombment with Internal and External Waste Disposal
DOEJRL-2001-1 l
Rev. 1 DraftJ_
Redline/Strikeout
1 The building must be put in a safe condition for operational activities. This would require
2 radiological surveys, fixing or removing contamination, a building inspection for industrial
3 safety concerns, and equipment repairs or upgrades to support the operation phase. It is assumed
4 that the 271-U Office Building would be needed for support of the preparation phase. Therefore,
5 it must be maintained in a safe condition as well.
6
7 G.13.1.1 Inspect 271-U. The building would be inspected to determine the condition of the
8 building and its equipment. ]nfotmation for this inspection would help finalize planning for the
9 operational phase of this alternative. The functional requirements of the various activities
10 involved in opcrnting the facility and the building modifications and upgrades necessary to safely
1I accomplish the activities would be identified. Modifications identified would be designed. The
12 services and/or new equipment needed would be procured.
13
14 No known building repairs or upgrades would be needed. Also, it is assumed for this alternative
15 that minimal equipment repairs and upgrades would be necessary.
16
17 G.13.1.2 221-U Facility Modifications. Limited modifications to the 221-U Facility would be
18 necessary to accomplish equipment removal and decontamination operations. Facility
19 modifications would primarily involve disconnecting and blanking utility and electrical lines
20 where they are no longer required and installing temporary utilities that would be required to
n 21 support planned operations. The change room at the northeast end of the operating gallery would
22 be renovated and established as the main access and egress point for canyon operations. Water
23 and drain lines for the change room facility could be tied into the active systems in the
24 271-U Office Building.
25 Additiona1480-volt electrical service requirements would be installed, as necessary, to support
26 portable ventilation requirements and selected decontamination equipment, such as air
27 compressors for pneumatic toots and temporary greenhouse structures. In addition, 480-volt
28 electrical service would be installed to support waste processing and
29 decontamination/disassembly operations.
30
31 G.1.3.1.3 Add New Air Handler. Installation of a new air-handling unit on the roof of 221-U
32 is a major modification that may or may not be required based on further analysis of tasks and
33 seauencinp of events that will be done durin g design If needed weuld-eeeuF-tThe unit would
34 be located on the northeast end of the building and require penetrations through the roof for air
35 duct connections.
36
37 G.1.3.1A Grout Cell Drain Header and Vent Tunnel. The cell drain header would be filled
38 with cement grout during the building preparation phase once the new air handler is installed and
39 operational. Grouting would fill the 0.6-m (24-in.)-diameter void space and encapsulate any
40 contamination present in the pipe. After the connecting pipes to cell 10 are sealed, grout would
41 be pumped in from both ends of the cell drain header. Because the cell drain header flows
42 downward from the building ends toward cell 10, a liquid-consistency grout would flow through
43 the header and require very little pumping pressure. Drainage openings in each process cell
44 would act as air vents, and the pressure would be regulated so that the grout is visible in the
Final Feasibility StadyJor site Canyon Disposition lnitiativc (221-U Faci(iry)
^ n , } G-9