Which is better pwr or bwr

That means the water remains in liquid phase throughout the cycle of primary loop. However, the water in the secondary loop is allowed to boil. Here the normal water H 2 O is allowed to change its phase. Thus the water liquid phase is first converted into steam gaseous phase within the reactor, and then the steam is again condensed to water before pumping back to reactor.

Here steam is generated in a heat exchanger outside the nuclear reactor. Here steam is generated within the reactor itself.

Here the water in the primary loop is maintained at high pressure 15 — 17 MPa to avoid boiling at reactor exit. Here water pressure remains comparatively low 7 — 8 MPa as it is allowed to boil. A pressurizer is required to use mandatorily to maintain water pressure in such a way that it does not evaporate even at very high temperature. No such pressurizer is employed as evaporation of the water is desired.

PWR has comparatively low thermal efficiency owing to two different loops. BWR offers higher thermal efficiency. In PWR, the control rods are inserted from the top of the nuclear reactor.

In BWR, the control rods are inserted from the bottom of the nuclear reactor. Since the fluid is maintained at high pressure, so the PWR core volume is less. For the same power generation, core volume of the BWR is comparatively larger. Since the working fluid loop is separated from the primary loop, so PWR is less risky in spreading of radioactive materials owing to leakage. Since same fluid passes through the reactor and turbine in BWR plants, so any leakage in the turbine can spread radioactive elements into the atmosphere.

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Results 1 - 1 of 1. Search took: 0. Greneche, D. Citation Export Print Permalink Translate. Abstract Abstract. One of the major concerns of electricity production with nuclear energy has to do with safety. The author warrants that the work is the author's own and that Stanford University provided no input other than typesetting and referencing guidelines. The author grants permission to copy, distribute and display this work in unaltered form, with attribution to the author, for noncommercial purposes only.

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