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Engineering
Nuclear Engineering
BWR Fuel Assembly Question -- Why do BWRs have shrouds?
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[QUOTE="Astronuc, post: 5891826, member: 15685"] Based on Jim Hardy's response, perhaps we better understand if 'shrouds' refers to the channels on BWR fuel assemblies or to core shrouds, which surround the core. With respect to core shrouds, both BWRs and PWRs have core shrouds, although in PWRs the shroud is comprised of the core barrel and baffle, and supporting structures. PWR - [URL]https://www.nrc.gov/reading-rm/doc-collections/gen-comm/info-notices/1998/in98011-fig01.gif[/URL] [URL]https://www.nrc.gov/reading-rm/doc-collections/gen-comm/info-notices/1998/in98011-fig02.gif[/URL] BWR - [URL]http://www.ndt.net/article/wcndt00/papers/idn268/fig1.gif[/URL] The BWR core shroud sits between the core and pressure vessel, and it forms an annulus for the feedwater to accumulate. In the annular regions are pumps. In the case of traditional GE design, the pumps are jet pumps which draw water from the annulus and force it into the lower plenum where the water turns up into the core. The ABWR uses more conventional pumps, which are located at the bottom of the annulus. ABB and Siemens BWRs used such pumps from the beginning. The PWR core barrel and baffle provide the same function as the BWR core shroud. PWR fuel assemblies are open, without channels, whereas BWR fuel assemblies use channels. The channels prevent cross-flow among adjacent assemblies, which is important because they can have different amounts of boiling or void fraction/quality. [/QUOTE]
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BWR Fuel Assembly Question -- Why do BWRs have shrouds?
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