NA 062

DIN Standards Committee Materials Testing

Project

Nuclear energy - Determination of neutron fluence and displacement per atom (dpa) in reactor vessel and internals

Abstract

ISO 19226:2017 provides a procedure for the evaluation of irradiation data in the region between the reactor core and the inside surface of the containment vessel, through the pressure vessel and the reactor cavity, between the ends of active fuel assemblies, given the neutron source in the core. NOTE These irradiation data could be neutron fluence or displacements per atom (dpa), and Helium production. The evaluation employs both neutron flux computations and measurement data from in-vessel and cavity dosimetry, as appropriate. This document applies to pressurized water reactors (PWRs), boiling water reactors (BWRs), and pressurized heavy water reactors (PHWRs). ISO 19226:2017 also provides a procedure for evaluating neutron damage properties at the reactor pressure vessel and internal components of PWRs, BWRs, and PHWRs. Damage properties are focused on atomic displacement damage caused by direct displacements of atoms due to collisions with neutrons and indirect damage caused by gas production, both of which are strongly dependent on the neutron energy spectrum. Therefore, for a given neutron fluence and neutron energy spectrum, calculations of the total accumulated number of atomic displacements are important data to be used for reactor life management.

Begin

2023-05-12

WI

00430115

Planned document number

DIN EN ISO 19226 rev

Project number

06236536

Responsible national committee

NA 062-07-54 AA - Criticality safety and decay power  

Responsible european committee

CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection  

Responsible international committee

ISO/TC 85/SC 6/WG 1 - Power reactor analyses and measurements  

previous edition(s)

Nuclear energy - Determination of neutron fluence and displacement per atom (dpa) in reactor vessel and internals (ISO 19226:2017); German version EN ISO 19226:2020
2020-05

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Contact

Dr.

Franziska Baensch

Am DIN-Platz, Burggrafenstr. 6
10787 Berlin

Tel.: +49 30 2601-2644
Fax: +49 30 2601-42644

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