By D. Poeth; Niskayuna NY Knolls Atomic Power Laboratory (KAPL)
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Extra resources for The Evaluation of Lithium Hydride for Use in a Space Nuclear Reactor Shield, Including a Historical Perspective
Example text
The NRPCT was concerned that this lower temperature limit would unnecessarily restrict the design space for Prometheus, perhaps making LiH unattractive compared to a Be/B4C or all 10B shield. However, SP-100 also believed that the extent of gamma induced swelling at a given temperature (nominally > 400K) would be a function of dose rate (the lower the dose rate, the lower the swelling), since, for instance, the recombination of lithium and hydrogen (reducing swelling) would compete more favorably at a lower dose rate.
The corresponding equilibrium constants, Keq, defined by the product of the activities (a) of the reaction products (raised to the appropriate power based on the balanced reaction formula) divided by the product of the reactant activities (also raised to the PRE-DECISIONAL – For Planning and Discussion Purposes Only Page 26 Enclosure 2 to MDO-723-0048 appropriate power based on the balanced reaction formula, which are all first power in this case), ( K = eq a LiO2 ( s) a H2 ( g) a LiH ( s ) a LiOH ( s ) ) remains significantly greater than one over the range of temperatures investigated confirming that the reaction strongly favors “completion”.
Background on Space Nuclear Power. Science & Global Security 1: 93-107. (m) MDO-723-0049/B-MT(SPME)-22, Space Shield Materials for Prometheus Application, For Information, to be issued. (n) NRPCT Letter: SPP-67210-009/B-SE-0161, to be issued. (o) Bettis Letter: B-SE-0106, dated April 28, 2005. (p) NRPCT Letter: MDO-723-0012/B-MT(SPME)-002, dated February 21, 2005. (q) NR Letter S#05-02377, dated July 15, 2005. (r) Y-12 Document. Identification and Analysis of SP-100 Reactor Shield Information, Fabrication Considerations and Resource Assessment of Space Reactor Shielding, dated February 2004.