DECOMMISSIONING WORK PLAN SURFACE SHIP SUPPORT BARGE DISMANTLEMENT AND DISPOSAL Project Number: 501513 Contract Number: N00024-20-C-4139 Prepared for Naval Sea Systems Command 614 Sicard Street SE Washington Navy Yard, DC 20376-7007 Prepared by Aptim Federal Services, LLC 11400 Parkside Drive, Suite 400 Knoxville, Tennessee 37934 April 2021 Revision 1 DECOMMISSIONING WORK PLAN SURFACE SHIP SUPPORT BARGE DISMANTLEMENT AND DISPOSAL Prepared by APTIM Federal Services, LLC 11400 Parkside Drive, Suite 400 Knoxville, Tennessee 37934 April 2021 Revision 1 Reviewed/Approved by: __________________________________ Date: April 7, 2021 Michael A. Carr, CHP APTIM Project Radiation Safety Officer 865-250-2149 Reviewed/Approved by: __________________________________ Date: April 7, 2021 Art Palmer, CHP APTIM Technical Manager 865-765-7898 Reviewed/Approved by: __________________________________ Date: April 7, 2021 Rick Greene, CHP APTIM Certified Health Physicist 865-604-2338 Reviewed/Approved by: __________________________________ Date: April 7, 2021 Bruce A. Fox, PMP APTIM Project Manager 208-901-2142 Reviewed/Approved by: __________________________________ Date: April 7, 2021 Robert Biolchini, PE APTIM Site Manager 419-306-8994 Surface Ship Support Barge (SSSB) Dismantlement and Disposal Rev. 1 Contract Number N00024-20-C-4139 April 2021 Decommissioning Work Plan 501513 Record of Revisions Revision No. Description of Revision Date 0 Decommissioning Work Plan August 2020 1 Decommissioning Work Plan April 2021 - Various changes throughout based on NRC comments on Rev. 0 document and to incorporate minor updates to project status/approach. i Surface Ship Support Barge (SSSB) Dismantlement and Disposal Rev. 1 Contract Number N00024-20-C-4139 April 2021 Decommissioning Work Plan 501513 Table of Contents Record of Revisions ......................................................................................................................... i List of Tables ................................................................................................................................. xi List of Figures ................................................................................................................................ xi List of Attachments ....................................................................................................................... xii Acronyms and Abbreviations ...................................................................................................... xiii Executive Summary .................................................................................................................. ES-1 1.0 Facility Operating History .................................................................................................. 1-1 1.3.1 Office (Former Laundry) .............................................................................. 1-2 1.3.2 Machine Shop/Component Assembly – Disassembly .................................. 1-2 1.3.3 Dry Pit .......................................................................................................... 1-3 1.3.4 Laundry Drain/No.4 Centerline Tanks ......................................................... 1-3 1.4.1 Wet Pit Leakage ............................................................................................ 1-4 2.0 Facility Description ............................................................................................................ 2-1 2.1.1 Clean House, Wet Pit, and Shroud Canister Loading Station ...................... 2-1 2.1.1.1 Clean House ................................................................................... 2-1 2.1.1.2 Fuel Holding (Wet) Pit ................................................................... 2-2 2.1.1.3 Shroud Canister Loading Area ....................................................... 2-2 2.1.2 Heavy Component Shop ............................................................................... 2-2 2.1.3 Change Room and Casualty Control Station ................................................ 2-3 2.1.4 Log Room, Clean Tunnel, and Dirty Tunnel ................................................ 2-3 2.1.5 Pump Rooms ................................................................................................. 2-3 2.1.5.1 Main Pump Room .......................................................................... 2-4 2.1.5.2 Auxiliary Pump Room ................................................................... 2-4 2.1.6 Miscellaneous Spaces and Tanks .................................................................. 2-4 2.1.7 Heating, Ventilation, and Air Conditioning ................................................. 2-4 2.1.7.1 Office (Non-Radiologically Controlled) HVAC System ............... 2-5 2.1.7.2 Forward Potentially Contaminated HVAC System ....................... 2-5 ii Surface Ship Support Barge (SSSB) Dismantlement and Disposal Rev. 1 Contract Number N00024-20-C-4139 April 2021 Decommissioning Work Plan 501513 2.1.7.3 Aft Potentially Contaminated HVAC System ................................ 2-5 2.1.7.4 Change Room Exhaust, Chiller Equipment Room, and Machine Shop Ventilation Systems .............................................................. 2-5 2.4.1 Site Location and Description ...................................................................... 2-6 2.4.2 Population Distribution ................................................................................. 2-6 2.4.3 Current/Future Land Use .............................................................................. 2-7 2.5.1 Tow Route Description ................................................................................. 2-7 2.6.1 Site Description and Location ...................................................................... 2-7 2.6.2 Population Distribution ............................................................................... 2-10 2.6.3 Current/Future Land Use ............................................................................ 2-10 2.6.4 Mobile Bay ................................................................................................. 2-11 2.6.5 Climatology ................................................................................................ 2-11 2.6.6 Geology and Seismology ............................................................................ 2-13 3.0 Radiological Status ............................................................................................................. 3-1 3.1.1 Heavy Component Shop ............................................................................... 3-1 3.1.2 Casualty Control and Guard Stations ........................................................... 3-1 3.1.3 Change Room and Restroom ........................................................................ 3-1 3.1.4 Control Point/Anti-C Removal Area ............................................................ 3-1 3.1.5 Fan Room 2 (Aft) .......................................................................................... 3-2 3.1.6 Dirty Tunnel .................................................................................................. 3-2 3.1.7 Clean Tunnel ................................................................................................. 3-2 3.1.8 Clean House .................................................................................................. 3-2 3.1.9 Log Room ..................................................................................................... 3-2 3.1.10 Count Room .................................................................................................. 3-2 3.1.11 Main Pump Room Access ............................................................................ 3-2 3.1.12 Auxiliary Pump Room Access ...................................................................... 3-2 3.1.13 Office Spaces ................................................................................................ 3-3 3.1.14 Fan Room 1 (Forward) ................................................................................. 3-3 3.1.15 Machine Shop (Re-purposed) ....................................................................... 3-3 iii Surface Ship Support Barge (SSSB) Dismantlement and Disposal Rev. 1 Contract Number N00024-20-C-4139 April 2021 Decommissioning Work Plan 501513 3.1.16 Wing Tanks ................................................................................................... 3-3 3.1.17 Centerline Tank 3 ......................................................................................... 3-3 3.1.18 Centerline Tank 4 ......................................................................................... 3-4 3.1.19 Centerline Tank 8 ......................................................................................... 3-4 3.1.20 Centerline Tank 9 ......................................................................................... 3-4 3.1.21 Wet and Dry Pits ........................................................................................... 3-4 3.1.22 Wet Pit Shield Water Voids .......................................................................... 3-4 3.1.23 Wing Tank Voids (Port and Starboard) ........................................................ 3-4 3.1.24 Centerline Tank 3 Void ................................................................................ 3-5 3.1.25 Auxiliary Pump Room .................................................................................