Calculation of consistent steady-state conditions for boiling water reactors based on RETRAN models Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w3763959q

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  • A study regarding steady-state conditions in boiling water reactors was conducted in order to provide consistent initial conditions for transient analysis using the computer simulation code, RETRAN. Consistent steady states were generated with the RETRAN model of the system by first establishing a reference state, and then obtaining other steady states as asymptotic equilibria which the system approaches some time after introducing certain perturbations. A simplified version of the RETRAN model was then used as the basis for the development of an approximate explicit solution, based on steady-state mass and momentum conservation, to predict the asymptotic flow rates in the reactor vessel as a function of the recirculation pump speed. The results from these calculations were compared to the equilibrium conditions determined by the RETRAN calculations, sources of error were examined, and conclusions were drawn. The analysis demonstrated that the method used to predict the flows and pump speed at various steady-state conditions provides good agreement with the RETRAN results. An error analysis indicated that errors due to the approximations generally increased as the strength of the perturbation increased (i.e., increased deviation from the reference state). However, the magnitude of the errors is such that, within limitations, the simple model provides good approximations of the flows and pump speed which are consistent with the RETRAN model. The advantage of the explicit solution obtained by the simplified model lies in the fact that it permits direct and easy determination of steady-state system flow rates when pump speed and reactor power are given. When these flow rates are used as input to RETRAN, they will result in the determination of junction form loss coefficients for closed flow loops which will closely match those of the reference state, hence the condition for consistency is satisfied.
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