By George C Szego; John Edward Taylor

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Figure 7 predicts the reliability of parallel components for various single component and sensing system r e l i a b i l i t i e s .

T. v. V. T. A . ( s ) T. A. P- -7 P- -6 P- ^5S P- -5 P- -4S P- -4 P- -3S P- -3 P- -2S P- -2 P- -IS P- -1 Isotope heat source Orifice Check valve R e s e r v o i r shutoff v a l v e O r g a n i c C / L shutoff v a l v e Thermally controlled valve Turbine controlled valve T u r b i n e shutoff v a l v e M e r c u r y injection control valve Turboalternator (redundant) Turboalternato r P u m p — NaK h e a t r e j e c t i o n d r a i n Pump — Organic C / L drain Pump —Organic coolant-lubricant loop ( r e d u n d a n t ) Pump — Organic coolant-lubricant ( C / L ) loop P u m p — NaK h e a t r e j e c t i o n loop #2 ( r e d u n d a n t ) P u m p —NaK h e a t r e j e c t i o n loop #2 P u m p — NaK h e a t r e j e c t i o n loop #1 (redundant) P u m p — NaK h e a t r e j e c t i o n loop #1 P u m p — M e r c u r y loop ( r e d u n d a n t ) P u m p — M e r c u r y loop P u m p — P r i m a r y NaK loop (redundant) P u m p — P r i m a r y NaK loop O r g a n i c c o o l a n t - l u b r i c a n t loop M e r c u r y loop NaK — H e a t r e j e c t i o n loop (2 l o o p s ) NaK — P r i m a r y loop 47 00 Fig.

The potential availability of Po-210 i s also shown on Fig. 9. With an additional capability, all of the fuels except Pm-147 could be available in sufficient quantity by 1969 to enable at least one launching a y e a r for systems with an over all efficiency in excess of 20%. Nuclear safety can be a s s u r e d by designing the fuel containment to remain intact under all possible conditions. This means that the fuel will r e - e n t e r the earth 1 s atmosphere and impact. The location of impact can, in all probability, be closely controlled in a manned mission.

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