Safety Assessment Study in Nanoscopic Circumstances for an Accidental Cooling Loop Failure (ACLF) in a Lunar Nuclear Power Reactor (LNPR) - Atomic Nanoscale Technology in the Nuclear Industry - page 34

FIGURE 4.1
Conceptual.design.of.a.ission.surface.power.system.

FIGURE 4.2
Front.view.of.a.ission.surface.power.system.

simpliied.coniguration.of.the.LNPR..The.event.low.of.an.accidental.cool-
ing. loop. failure. (ACLF). is. shown. in. Figure 4.5.. The. cooling. matter. is. the.
regolith,.which.is.lunar.highland.soil..Table 4.1.shows.a.comparison.of.lunar.
highland. soil. and. Earth. soil. (Prado. 2009).. The. temperature. of. the. Moon. is.
changed.by.the.Sun's.angle.of.the.solar.light.to.the.exposed.lunar.surface..
The.effective.heat.sink.temperature.is.examined.for.the.horizontal.and.verti-
cal.radiator.located.at.the.lunar.equator.(Ewert.1993),.which.is.in.Figure 4.6..
The.heat.transfer.of.the.cooling.is.done.by.the.radiation.on.the.Moon..The.
surface. temperature. rises. up. to. equilibrium. with. incoming. solar. radiation.
because.there.is.no.atmosphere.and.the.surface.is.rock.material.of.low.con-
ductivity. and. relatively. low. heat. capacity.. The. Stefan-Boltzmann. equation.
sets.the.numbers.that.govern.solar.radiation:

= εσ 4 . I T

(4.1)

.