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ANSI/ANS-19.10-2025
Methods for Determining Neutron Fluence in BWR and PWR Pressure Vessel and Reactor Internals
This standard provides a procedure for the evaluation, qualification, and reporting of (1) the best-estimate fast neutron fluence (E > 1.0 MeV); 2) the displacements per atom (dpa); and/or (3) the isotopic reaction rates at various regions surrounding the reactor from the core baffle/shroud to the inside surface of the vessel, through the RPV and the reactor cavity. The fast neutron fluence at elevations above and below the active fuel (e.g., grid plates, nozzles) is also addressed in this standard. This evaluation employs both fast neutron flux computations and measurement data from in-vessel and cavity dosimetry, as appropriate. This standard applies to both pressurized water reactors (PWRs) and boiling water reactors (BWRs).
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American National Standards Institute [ansi]