FM2 PPSRRCS Pressure Test Leak Check 1 UCB, March 16, 2006 THEMIS PROBE FM2 PRE-ENVIRONMENTAL REVIEW RCS MEOP TEST/LEAK CHECK Michael Sholl Berkeley RCS Lead Engineer University of California - Berkeley

FM2 PPSRRCS Pressure Test Leak Check 2 UCB, March 16, 2006 Overview MEOP tests and leak checks are scheduled to verify RCS system survived environmental testing Performed after thermal vacuum, vibration and shock testing Tests to be performed in Building 179 (magnetics) Test is identical to RCS MEOP/leak check performed March in Berkeley Primary hazards during test are helium asphyxiation and tank pressurization

FM2 PPSRRCS Pressure Test Leak Check 3 UCB, March 16, 2006 Test Sequence SV1 Manifold Tests Isolation Valve Cycle Test (SV1 manifold to 400psia) Forward Leakage Test (decay test) using panel gauge SV1 Leakage Test using pipette (depressurize SV1 manifold)) Cycling tests on latch and thruster valves LV Cycle Test Thruster Valve Cycle Test Low Pressure Transducer / Propellant Tank MEOP Test Low Pressure Transducer Output Test (pressurize tanks to 400psia) Propellant tank MEOP Test Latch, thruster and SV2 & SV3 leak tests Latch Valve Forward Leak Test Thruster Valve Forward Leak Test Low Pressure Service Valves (SV2 & SV3) Leak Test (depressurize tanks to 50psia) High Pressure Transducer / Pressurant Tank MEOP Test High Pressure Transducer Output Test (pressurize COPV to 1750psia) Pressurant Tank MEOP Test High Pressure Service Valve Functional Test High Pressure Service Valve Leak Test (depressurize COPV to 50psia)

FM2 PPSRRCS Pressure Test Leak Check 4 UCB, March 16, 2006 GSE 2TE (Low Pressure Test Panel) TE (High Pressure Test Panel) Thruster enable test set Pipettes (1ml) for valve leak checks Service Valves Latch Valves Thruster Valves Interfaces to s/c via nozzle throat plugs and Tygon tubing Droplet of H2O injected with syringe Helium K-bottle Blast Shield 1/2in thick polycarbonate

FM2 PPSRRCS Pressure Test Leak Check 5 UCB, March 16, TE (Low Pressure Test Panel)

FM2 PPSRRCS Pressure Test Leak Check 6 UCB, March 16, 2006 TE (High Pressure Test Panel)

FM2 PPSRRCS Pressure Test Leak Check 7 UCB, March 16, 2006 Thruster Enable Test Set Allows actuation of thruster valves Both seats simultaneously (cross-strapped) Individual seats Low-current mode to hold thrusters open during test LEDs indicate thruster firing

FM2 PPSRRCS Pressure Test Leak Check 8 UCB, March 16, 2006 Nozzle Throat Plugs

FM2 PPSRRCS Pressure Test Leak Check 9 UCB, March 16, 2006 Safety/MA Considerations 1.5x proof test on both panels and lines (tags will be in place by time of test) Only required personnel in test facility Blast shield and PPE (face shield/goggles) in use O 2 alarm and placarding in place Temperature and humidity Safety signoff at beginning and end of haz. proc. ESD per THM-SYS-014 EDS Control Plan Temperature: 65-75ºF Humidity: 25-60%

FM2 PPSRRCS Pressure Test Leak Check 10 UCB, March 16, 2006 Summary MEOP tests and leak checks are scheduled to verify RCS system survived environmental testing Procedure has been run, and is well-understood Safety precautions in place