A heavy load drop into the spent fuel pool, or onto the spent fuel pool wall, can affect the structural integrity of the spent fuel pool. A loss-of-inventory from the spent fuel pool could occur as a result of a heavy load drop. The staff evaluated heavy loads as Generic Technical Activity A-36, which resulted in the publication of NUREG-0612 [Ref. 1]. Cask handling is expected to be the domina...

A common class of shielding problems involves the calculation of biological dose rates from large distributed sources at localised positions. A typical example is that of calculating the dose at points around a transport cask. Sophisticated variance reduction methods must be used in Monte Carlo calculations to sample from the important parts of the source and to propagate particles towards the ...

This paper describes a new attitude control method for non-propulsive rotational state transition, Zero-Prop Maneuver, and demonstration onboard the International Space Station for a 90deg maneuver on November 5, 2006. The Space Station was maneuvered along a pre-planned trajectory which is optimized to take advantage of naturally occurring environmental torques in order to maintain CMG capacit...

System for ITER1 Pedro Lima, M.Isabel Ribeiro, Pedro Apar cio Instituto Superior T ecnico/Instituto de Sistemas e Rob otica Av.Rovisco Pais,1 | P 1096 Lisboa Codex, PORTUGAL

Higher enrichment of nuclear fuel along the manufacturing limit boron content in steel and aluminum alloys represents a significant challenge designing spent transport storage facilities. One possible solution for pools casks is burnup credit method that allows decreasing very high safety margins associated with fresh assumption An alternative based on placing neutron absorber material directly...