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- W30260771 abstract "The determination of accurately estimated critical rod positions (ECP) is required for safe start-ups after plant shutdowns. Typical procedures employ point-core reactivity balance models to do such estimates. The point-core models generally are accurate enough for quasi-equilibrium conditions. These conditions exist when a plant operates near steady-state power level and rod position for a prolonged period of time prior to shutdown. Shutdowns from nonsteady conditions, however, result in transients in the spatial distribution of fission products such as xenon and samarium. Severe xenon transients could cause point-core model ECPs to deviate appreciably from plant critical conditions. These reactivity deviations can reach a significant fraction of the plant operating license limits. A dimensional neutronics model can be used for ECP calculations in large reactor cores with better accuracy than point-core models. The PC1D axial neutronics code was developed for this application for both steady-state and transient xenon conditions. Pacific Gas and Electric (PG and E) has utilized this code for the last two cycles of operation of two reactors. This paper describes the code and PG and E's experience using it for ECPs." @default.
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- W30260771 date "1990-01-01" @default.
- W30260771 modified "2023-09-26" @default.
- W30260771 title "Start-up predictions using PC1D, a personal-computer-based neutronics code" @default.
- W30260771 hasPublicationYear "1990" @default.
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