id	keyword
ap-5418	pebble
ap-5418	reactor
ap-5418	uranium
ap-5418	fuel
ap-5418	bed
ap-5418	neutron
ap-5418	parameters
ap-5418	core
ap-5418	enrichment
ap-5418	loading
ap-5418	model
ap-5418	graphite
ap-5418	bed reactor