Advanced Technology Solar Telescope ENCLOSURE Risk Mitigation Le

Advanced Technology Solar Telescope ENCLOSURE Risk Mitigation Le. Ellen Phelps January 2006

Enclosure Systems Design Review Topics of Discussion • Overview & Charge to Committee (Mark Warner) • 6 Major Parts of SDR: n n n SRD Flow Down & Error Budgets (Rob Hubbard) Specifications (Le. Ellen Phelps) Reference Designs (Le. Ellen) Lunch n n n • • Performance & Analyses (Le. Ellen) Contracting Approach (Mark) Risk Areas (Le. Ellen) Plans for Future Work (Le. Ellen) AOB Executive Session (closed session for committee members) Feedback from Committee (All Hands) ---------------------------------------------------- Dinner 10/24/2021 January 18, 2006 Overview & Charge to Committee 2

Enclosure Risk Mitigation • Cost • Schedule • Technical • Safety 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 3

Enclosure Cost Estimate Methods • A specifications and 3 d CAD model were generated in-house which flowed down from SRD • Series of computational fluid dynamics (CFD) and other engineering analyses performed on model to verify performance requirements could be met • Bottom-up $ estimate performed on enclosure model & specs n n Traditional cost-per-pound of steel System components cost estimates Comparison to previous projects Engineering experience • Funded design evaluation studies were commissioned with 2 enclosure vendors/engineering firms to (a) review our conceptual designs and specs; and (b) provide independent cost estimates: n n M 3 Engineering (Tucson, AZ) Vertex. RSI (Richardson, TX) • Updated in March 2005 for inflated material costs, height, and refined thermal designs 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 4

Enclosure Risk Mitigation Thermal System Costs ‘Value Engineering’ Challenge to meet budget target: • Lower $/ft 2 n Identified a lower cost style of plate coil • Reduce Thermal Load/ft 2 n Optimized thermal ground treatment size and design • Reduce Overall ft 2 of Coverage n n Reduced thermal loads when considered with site seeing/wind conditions reduced skin temperature control requirements of Lower Enclosure Optimized Carousel shape to increase area not subject to insolation thereby not covered with plate coil • Reduce costs elsewhere n Simplified plate coil mounting details 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 5

Enclosure Risk Mitigation Enclosure Costs Summary of cost as risk: • The first round of comprehensive cost estimates was in August 2004 with updates in March 2005 • We have continued to develop the specifications • We believe the current specification fits the current budget • Plan to update estimates with input from industry 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 6

Enclosure Risk Mitigation Schedule 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 7

Enclosure Risk Mitigation Schedule • Enclosure as near critical path • Enclosure, TMA, and S&O Building foundations • General construction contingencies 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 8

Enclosure Risk Mitigation Schedule • M 1 early procurement → Site work & Enclosure as critical path n n Critical path to TMA installation in any case Requires aggressive planning, coordination, and knocking down issues before they become issues (dedicated COTR) 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 9

Enclosure Risk Mitigation Schedule • Enclosure, TMA, and S&O Building foundation design, construction, and coordination n n Early start on design during D&D phase (if funds are available) with early input from vendors during construction phase Foundation designs ready for an early construction start 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 10

Enclosure Risk Mitigation Schedule • Environmental, cultural, weather, labor, and safety issues are sure to arise n n A certain amount of contingency is planned for in the schedule Regardless, this requires aggressive coordination and attention (dedicated COTR) 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 11

Enclosure Risk Mitigation Technical Risks • Thermal Performance n n Include easy upgrade paths for full coverage with plate coil Mat. Lab/Simulink model of controls • Thermal coating system cost, availability, & performance n Work requirements with vendors • Minimize streaming of ground layer up and over (Co. DR recommendation) n Multi-physics model of optimized systems 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 12

Enclosure Risk Mitigation Technical Risks • Potential for vibration transmission between the Enclosure and TMA through the foundations n FE modeling and vibration analysis to study coupling effects using Site soil characteristics • Azimuth cable wrap performance n Multiple vendor input 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 13

Enclosure Risk Mitigation Technical Risks OPEN THE FLOOR FOR DISCUSSION What other technical risk areas should we consider? 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 14

Enclosure Risk Mitigation Safety • Contractor Design Phase Safety Contractor safety record as a significant selection factor n Designs meet appropriate codes and standards n Review points to analyze construction methods, operability, maintainability, and accessibility n 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 15

Enclosure Risk Mitigation Safety • Construction Phase Safety n n Safety processes (e. g. Job Task Analysis, etc. ) as fundamental requirement in contract → Uncompromising scrutiny Completion of Enclosure before TMA installation phase • Schedule contingency ‘slack time’ required? n n Weather conditions play heavily into work at height and with crane picks Create a culture that values safety, for example: • Dedicated on Site Safety Officer with the authority to shut down construction • Daily safety briefings 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 16

Enclosure Risk Mitigation Safety • Operation Phase Safety Potential hazards ID’d during design n n Color schemes and other cues for rotational versus non-rotational components Any confined spaces clearly marked and procedures in place Isolation points for lock-out tag-out procedures easy to identify etc. 10/24/2021 January 18, 2006 Enclosure Risk Mitigation 17