Statistics – Applications
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..673w&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In
Statistics
Applications
Fast And Breeder Reactors, Power And Production Reactors, Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
The 15-kWt Heatpipe Operate Mars Exploration Reactor (HOMER-15) and the 300-kWt Safe Affordable Fission Engine (SAFE-300) are fast nuclear reactors that incorporate Heatpipe Power Systems (HPS) to transfer energy from the core. The systems were analyzed from a thermodynamic standpoint in order to obtain a temperature profile of the radial reflectors and shielding around the two systems. The temperature distribution was used to determine how much the core will expand upon reaching operating temperatures of 900K and 1200K, respectively. The MCNP models of the systems were modified to reflect these changes. The MCNP output was then used to determine if the HOMER and SAFE systems have enough excess reactivity upon launch to produce power after considering thermal core expansion and burn-up over the life of the systems. The value of the multiplication factor (keff) at the end of life for the HOMER is 1.0133+/-0.0003 and the value for the SAFE is 1.0128+/-0.0003. The final keff values for the HOMER and SAFE reactors with a control drum stuck turned inwardly are 1.0005+/-0.0004 and 0.9956+/-0.0003, respectively. Fuel loading anomalies were also analyzed for the HOMER-15. Worst case scenarios that considered fuel being placed into extreme positions during loading all displayed negative reactivity feedback. .
Poston David I.
Walter Joshua C.
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