Analysis for Characteristics of Nuclear Spacecraft in a Nanogravity Environment for Deep Space Exploration - Atomic Nanoscale Technology in the Nuclear Industry - page 60

TABLE 5.2
Launch.Accidents

Segment Probability

Prelaunch 6.5.×.10 −5

Early.launch 6.2.×.10 −3

Late.launch 2.1.×.10 −2

VVEJGA 8.0.×.10 −7

Note: . VVEJGA.=.Venus-Venus-Earth-
Jupiter.Gravity.Assist.trajectory.

TABLE 5.3
Failure.Frequency.(Number.per.Year)

Case Frequency(0thyr) Frequency(50thyr)

RTG 1.822.×.10 −6 2.868.×.10 −6

Photovoltaic.battery 2.003.×.10 −5 1.160.×.10 −4

in. proportion. to. its. initial. momentum,. speeding. its. travel. through. outer.
space..Thus,.this.factor.signiicantly.affects.the.RTG.system.speed.compared.
to.the.photovoltaic.battery.system,.because.of.the.radioactive.hazard.or.dam-
age.to.the.planets,.including.the.Earth..This.is.shown.in.the.event.lows.in.
Figure 5.6(a)..The.time.period.is.50.years.of.total.dynamic.simulations.

5.4 Results
The.problem.is.to.explain.several.economic.and.safety.aspects..The.reason.
why. these. characteristics. are. examined. is. that. these. two. factors. are. not.
proportionally. important. in. nuclear. power. generation.. There. are. several.
assumptions. that. are. described. in. the. solar. power. equation. (Angelo. 1985;.
Wertz.1999)..The.procedures.are.performed.by.the.aspects.of.economic.and.
safety.. The. results. are. obtained. as. break-even. orbital. locations. for. the. two.
systems.
With.respect.to.the.economic.aspect,.the.simpliied.assumption.is.that.the.
same.power.exists.(5.kWe).during.eclipse.and.daytime..With.respect.to.the.
safety.aspect,.the.calculation.methods.are.explained.using.SD..For.example,.
in.Figure 5.6(a),.from.launch,.the.line.shows.the.sequence.of.the.scenarios.as.
well.as.the.dynamic.behavior..Figure 5.7.shows.the.events.of.Launch.1.(see.
Figure 5.6)..The.values.are.obtained.using.the.four.rules.of.arithmetic.addi-
tion,.subtraction,.multiplication,.and.division.with.the.operator's.judgments.
as.the.event.sequence.progresses.and.are.described.by.the.lines..Each.prob-
ability. of. the. accident. is. decided. by. the. several. data. judgments. including.