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Engineering
Nuclear Engineering
What is the reactor power at Source, Intermediate and Power
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[QUOTE="jim hardy, post: 5485588, member: 327872"] Was i surprised to find this old document. It's a "how it works" for Westinghouse PWR. [URL]http://pbadupws.nrc.gov/docs/ML0230/ML023040050.pdf[/URL] Three ovelapping instruments cover the reactor from zero to 200% power. They use neutron detectors located a foot or two or three outside the reactor vessel in the ventilating space. two are logarithmic , one is linear here's their approximate overlap Source range indicates counts from a proportional counter tube, ie individual neutrons that strike the detector, from about 1cps to 1 million cps on a logarithmic counts per second meter scale Intemediate range indicates current from a small compensated ion chamber just above the source range counter. It indicates DC current not counts, because when count rate gets high enough the pulses run together and become a DC current. When intermediate range is indicating we turn off high voltage to source range so as to not saturate its detector. intermediate range indicates current from approximately 10[SUP]-11[/SUP] amps to a milliamp on a logarithmic ammeter scale. It reads about a milliamp at full power but with its 8 decade log scale it's not accurate enough for fine control of power. Power range is linear and indicates current from a large ion chamber , calibrated to indicate reactor power on a linear scale from 0 to 120% . The power range instrument is capable of accurately reporting reactor power to 200% , two special fast response recorders are provided in the control board for "just in case" . Automatic trips will drop the rods long before it gets there. Detailed description at that link up above and here's the approximate overlap from its page 28 [ATTACH=full]101351[/ATTACH] be aware this chart is approximate, for teaching purposes only. But it i think answers your question for Westinghouse PWR's. Exact overlap depends on the arrangement of concrete surrounding the reactor and how far outside the vessel each individual detector is positioned. So do not expect to find any plant's actual numbers in exact agreement with it. They might differ by nearly a decade. Here's a top view of detectors relative to reactor from that PWR manual(well, my annotation should be obvious ). [ATTACH=full]101352[/ATTACH] Drawings of the actual instruments are there too. Reactor Engineer from any individual plant can give you his plant's actual overlap.old jim [/QUOTE]
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What is the reactor power at Source, Intermediate and Power
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