Draft Details

Designation:CSA N290.1:24
Contact name:Eve Stencel
Review start date:May 23, 2023
Review end date:Jul 22, 2023
Contact email:thuy.ton(at)csagroup.org
Draft Scope/Description:

1.1 Application

This Standard applies to the design, procurement, installation, commissioning, operation, testing, and maintenance requirements of reactor shutdown systems (SDSs), based on insertion of a neutron absorbent material in the core, for existing and new water-cooled nuclear power plants (NPPs).


1. “Existing nuclear power plants” refers to NPPs in service prior to 2013.

2. The requirements for new plants and existing plants might differ. Where requirements differ for new plants and existing plants, the differences are explicitly stated.

1.2 Companion document

This Standard is written as a companion document to CSA N290.0, which provides general requirements for the NPP safety systems, including the reactor SDS. This Standard and its companion CSA N290.0 provide the requirements for the reactor SDS.

1.3 Inclusions

This Standard uses the term SDS, which includes the following functions: detection, trip, actuation, and means of shutdown (MSD).

1.4 Exclusions

This Standard does not apply to

 small modular reactors (SMRs); and

Note: SMRs are fission reactors with a power level less than approximately 300 MWe per module.

 non-water-cooled reactors.

1.5 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

You may comment on any section of this document by clicking the “Submit Comment” link at the bottom of the relevant section.