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기술보고서

기술보고서 게시판 내용
타이틀	Compact Fuel Element Environment Test
저자	Bradley, D. E.;; Mireles, O. R.;; Hickman, R. R.;; Broadway, J. W.
Keyword	CERMETS;; ENVIRONMENTAL TESTS;; HIGH TEMPERATURE GASES;; HYDROGEN FUELS;; MELTING POINTS;; NUCLEAR FUELS;; RADIO FREQUENCY HEATING;; ROCKET NOZZLES;; SPECIFIC IMPULSE
URL	http://hdl.handle.net/2060/20130003240
보고서번호	NASA/TM-2012-217476
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Deep space missions with large payloads require high specific impulse (I(sub sp)) and relatively high thrust to achieve mission goals in reasonable time frames. Conventional, storable propellants produce average I(sub sp). Nuclear thermal rockets (NTRs) capable of high I(sub sp) thrust have been proposed. NTR employs heat produced by fission reaction to heat and therefore accelerate hydrogen, which is then forced through a rocket nozzle providing thrust. Fuel element temperatures are very high (up to 3,000 K) and hydrogen is highly reactive with most materials at high temperatures. Data covering the effects of high-temperature hydrogen exposure on fuel elements are limited. The primary concern is the mechanical failure of fuel elements that employ high melting point metals, ceramics, or a combination (cermet) as a structural matrix into which the nuclear fuel is distributed. It is not necessary to include fissile material in test samples intended to explore high-temperature hydrogen exposure of the structural support matrices. A small-scale test bed designed to heat fuel element samples via noncontact radio frequency heating and expose samples to hydrogen for typical mission durations has been developed to assist in optimal material and manufacturing process selection without employing fissile material. This Technical Memorandum details the test bed design and results of testing conducted to date.