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THERMAL EXPANSION OF SNAP MATERIALS

Description: Thermal expansion characteristics were determined for fuel-moderator, reflector, cladding, and engineering erials within the SNAP-2 core vessel. Values were denined for AISI Type 347 stainless steel, Hastelloy N, Zr, ZrH, and zirconium --uranium hydrides, from room temperature to temperatures greater than 1300 deg F. Derived equations were calculated for these materials, using a least squares analysis. Thermal expansion coefficients for the temperature range of 77 to 1200 deg F are: 10.34 x 10/sup 6/ in./ in./ deg F, for Type 347 stainless steel; 7.46 x 10/sup -6/ in./in./ deg F, for Hastelloy N; 9.07 x 10/sup ->/ in./ in./ deg F, for Be; and 6.12 x 10/sup -6/ in-/in./ deg F, for Zr--7 wt% UH with an N = 6.4. (auth)
Date: July 30, 1961
Creator: Watrous, J.D.
Partner: UNT Libraries Government Documents Department

Compatibility and stability of plutonia-238 base cermet fuel forms in refractory alloy containers at 1500$sup 0$ to 2000$sup 0$C

Description: The compatibility of two and stability of three plutonia-238 base cermet fuels were investigated at 1500 deg to 2000 deg C from which were well in excess of current RTGs. A Battelle-Columbus Laboratories plutonia-molybdenum cermet (BCL-PMC) developed as a precurser of the current PMC fuel form was investigated for stability at 1500 deg to 2000 deg C for times to 10,000 h. The thoria and molybdenum overcoated test specimens encapsulated in single W-25Re containers degraded with increasing time and temperature. The 1000-h specimens remained relatively intact; the 10,000-h specimens transported almost entirely to the container walls. The interim plutonia-thoria-molybdenum solid-solution cermet (SSC) fuel form lost from most to all of the molybdenum network in exposure at 1800 deg C for 5000 h. This behavior was inferior to the two PMC fuel forms. Comparative compatibility of the SSC was the same as the PMC. Behavior of the current reference PMC fuel form was equivalent to the BCL-PMC, with enhanced stability exhibited when exposed in TZM or Ta-10W inner containers. Exposures at 1500 deg C for 500 and 5000 h, 1800 deg C for 1000 and 5000 h, and 2000 deg C for 1000 h in double container semi-system test configurations resulted in increased fuel form degradation with increasing temperature and time. However, TZM liners with TZM, Mo-46Re, and W-25Re structural members provided excellent containment at all temperatures. (auth)
Date: September 1, 1973
Creator: Watrous, J.D. & Ferguson, W.E.
Partner: UNT Libraries Government Documents Department