28 June 2017 What to capture Everything that comes out of the rocket nozzle at the A3 test stand will be captured downstream during normal operation of the rocket test Where capture is not possible eg a high energy neutron particle shielding to slow and prevent escape to within regulatory ID: 781458
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Slide1
Non-nuclear Sub-Scale Testing and Design
28 June 2017
Slide2What to capture?Everything that comes out of the rocket nozzle at the A3 test stand will be captured downstream during normal operation of the rocket test. Where capture is not possible (e.g., a high energy neutron particle), shielding to slow and prevent escape to within regulatory limits will
apply
The E3 subscale test components must support demonstration of the thermal hydraulic aspects necessary to ensure gases will flow as required (e.g., no limiting backpressure) and water can be processed (e.g., no stoppage of flow due to debris collection) regardless of the transient.
A3 GTF Exhaust Capture System
Slide3A3 GTF Exhaust Capture SystemWhy to
capture?
The NRC’s top priority is the health and safety of the public, which will remain true with the NTP-GTF.Potentially minimizing components needed for this effort, and health and safety of the public, are the best reasons to capture everything that exits the rocket nozzle
.
Experience with offsite dose calculations for normal effluents is the driver for the selection of the radionuclides of interest.
Slide4How to Capture?The needs of the geometry, for the purposes of test demonstration, and impacts of the chosen geometry on the capture system need balancing.
There
are geometry and design choices that will affect the combustion reaction
A3 GTF Exhaust Capture System
Slide5E3 Subscale Test Stand Component Needs - Mechanical
A3 Need
Related Test Operating Condition
E3 Subscale Test Stand Arrangement (Y/N)
Diffuser material build up to prevent damage from particulates that might cause holes.
Accident Conditions.
Y
Vacuum breakers for overpressure protection.
Normal Operation and Accident Conditions.
Y
Pumps, Filters, Resin Beds, Conditioners, and Heat Exchangers necessary to support a spray water loop sufficient in capacity to maintain required material temperatures during the rocket test.
Startup, Shutdown, Normal Operation, and Accident Conditions.
Y
Slide6E3 Subscale Test Stand Component Needs - Mechanical
A3 Need
Related Test Operating Condition
E3 Subscale Test Stand Arrangement (Y/N)
Means to ensure it is impossible for a core relocated to the engine exhaust debris trap to form a critical mass geometry.
Accident Conditions
Y
Means to avoid overheating or overpressurization in diffuser due to unisolable break in test cell.
Accident Conditions
Y
A nitrogen purge path, if not sent through the same path as hydrogen, when hydrogen flow needs stopped. Treatment for diffuser side requires same consideration.
Startup and Shutdown, Accident Conditions
Y
Slide7E3 Subscale Test Stand Component Needs - Mechanical
A3 Need
Related Test Operating Condition
E3 Subscale Test Stand Arrangement (Y/N)
A better understanding of the regeneration setup for the desiccant dryer removing water vapor from the oxygen stream as it is likely to also adsorb noble gases. It may be more practical to treat as solid radwaste and dispose of as is.
Normal Operation and Shutdown
Y
Addition of delay tanks, resin beds, and filters for handling of radioactive water. Alternatively, electro-deionization and reverse osmosis may be considered.
Normal Operation, Shutdown, and Accident Conditions
N
Consideration of additional filters upstream the oxygen Dewar storage tank to capture any solidified noble gases that did not plate out in the condenser.
Shutdown
N
Slide8E3 Subscale Test Stand Component Needs - Mechanical
A3 Need
Related Test Operating Condition
E3 Subscale Test Stand Arrangement (Y/N)
Incorporation of a decay heat removal loop at the test cell.
Shutdown
Y
Incorporation of a reserve hydrogen inventory for emergency core cooling discharge.
Accident Conditions
Y
System to regulate core power and trip reactor if required.
Startup, Shutdown, Normal Operation, and Accident Conditions
Y
Fire protection
Startup, Shutdown, Normal Operation, and Accident Conditions
Y