Measurements of transient water flows are performed in a 1/15-scale Fast Flux Test Facility nuclear reactor outlet plenum. During a repeated inlet-flow coastdown transient, measurements are made of the time-dependent, ensemble-averaged values of the velocity, turbulence kinetic energy, and Reynolds stress fields. These data are compared to predictions from a fluid dynamic simulation which uses a two-equation turbulence model. In general the comparison is good, and most observed transient disagreements can be attributed to errors in the calculation of the initial conditions rather than transient effects.

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