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- W158414568 abstract "Research reactors with plate-type fuel have received significant attention in recent years concerning the potential for fuel plate damage following a loss-of-coolant accident (LOCA). The typical plate-type reactor design that is common throughout the world has fuel plates that are nominally 1.25 mm thick with water coolant channels nominally 2 mm thick. Some of these reactors operate with downflow closed coolant loops, some with coolant loops open to the pool, and other entirely under natural convection. Of particular interest, are cores operating with forced downflow under high-performance conditions and low departure from nucleate boiling ratios for normal operation. In these reactors, following a LOCA, flow reversal occurs because of the normal convective forces of the water in the heated channels. The flow reversal period is particularly critical because the control rods may not yet be fully inserted in the core from the trip action, and the heat production within the plates is still high. Current studies of this flow reversal situation with RELAP5/MOD2 have indicated the development of a pulsed boiling situation with significant instabilities. To verify the calculations, the authors have constructed an experimental apparatus involving only upward convective flow, gas void production, and temperature rise in a heated more » channel under constant pressure hydraulic difference conditions across the channel. Pulsed boiling conditions were observed once saturation temperatures were attained in parts of the channel, but they also noted pulsed production of void (desorption of dissolved gases) at much lower temperatures. « less" @default.
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- W158414568 date "1991-01-01" @default.
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- W158414568 title "Desorption effects in narrow vertical channels following a LOCA" @default.
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