A Method for Evaluating the Radioactive Source Term of a Loss of Water Accident in a Pressurized Water Reactor Nuclear Power Plant
A loss of water accident, radioactive source technology, applied in the field of nuclear radiation safety
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[0070] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0071] A method for evaluating the radioactive source item of a pressurized water reactor nuclear power plant loss of water accident provided by the present invention mainly includes the following steps:
[0072] (1) Calculation of the initial activity of nuclides released from the core into the containment atmosphere
[0073] Consider that the radionuclides in the gap between the core fuel pellets and the cladding are instantly released into the containment and mixed uniformly. The initial value of the radionuclide activity released from the core to the containment is obtained by multiplying the core stock at the end of the reactor equilibrium cycle life by the release share of each nuclide from the core to the containment atmosphere. Species distribution, multiplied by the percentages of species corresponding to molecular iodine, organic iod...
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