EDM Collaboration Meeting, October 5-7, 2006

WBS 1.43He Services (He3S)

“Homework”Steve Williamson

EDM Collaboration Meeting, October 5-7, 2006

1.4.5.5 Purifier Film Killers Contingency

Technical Contingency: 10% (New design, development of new technology which advances state-of–

the-art) Weight: 4 (Design or manufacturing) Weighted Contingency: 40%

Cost Contingency: 10% (Top-down estimate from analogous program) Weight: 2 (Material cost and labor rate) Weighted Contingency: 20%

Schedule Contingency: 4% (Delays completion of non-critical path subsystem item)

Total Contingency: 64%

Risk A number of methods have been proposed to stop superfluid film flow in order to

reduce contamination of the absorption pump. The choice of which method to pursue will require R&D and may involve unanticipated design constraints and delays. If initial design concepts do not work out, then additional time will be required to develop alternatives.

Risk Likelihood of Occurrence: Likely (= >50%) Risk Consequence/Impact: Significant (Significant technical degradation – could affect

heat load, 4He purity, time between regeneration – which affects measurement efficiency)

Overall Risk Rating: Medium risk

EDM Collaboration Meeting, October 5-7, 2006

EDM Collaboration Meeting, October 5-7, 2006

Contingency Technical

Contingency: 10% (New design, development of new technology which advances state-of–the-art)

Weight: 4 (Design or manufacturing) Weighted Contingency: 40%

Cost Contingency: 15% (Engineering judgment) Weight: 2 (Material cost and labor rate) Weighted Contingency: 30%

Schedule Contingency: 4% (Delays completion of non-critical path subsystem item)

Total Contingency: 74%

Risk The concept for the actuator involves a pneumatic system with helium as the

working fluid for the transmission of force from 300K to 4K. If that initial design concept does not work out, then additional time will be required to develop an alternative

Risk Likelihood of Occurrence: Likely (= >50%) Risk Consequence/Impact: Significant (Significant technical degradation –

could affect valve cycles, cell polarization) Overall Risk Rating: Medium risk

1.4.10.1.3 Cell Isolation (V1) Valve Actuators

Changed. Was 10%

Changed. Was Critical.

EDM Collaboration Meeting, October 5-7, 2006