ZrH reactor lattice spacing (heat transfer considerations)

Abstract

Teziperature calculations for a 295 element ZrH reactor at fuel element spaclngs from O.OlO" to 0.065" showed a very small dependence of reactor tecg^erature on element spacing. It was found that one variation m coolant channel area (2 zones) was sufficient to satisfactorily shape the radial flow profile for the core.

The Distance to the Crab Nebula and NP 0532

“…The abundances of helium and neon incorporated in these cross sections are probably too high. Revised cross sections, given by Brown and Gould (1970), make the observations more consistent with a value of N H of (3 ± 1.5) X 10 21 atoms cm -2 , assuming there is no interstellar molecular hydrogen (Felten 1970). If N H is this large, then the nebula is beyond virtually all of the hydrogen found in 21-cm emission measurements, implying a distance above the galactic plane of at least 200 pc and a distance of at least 2000 pc.…”