scope:

General

Requirements for nuclear power plants and nuclear facilities

This Standard describes the requirements for seismic instrumentation systems for nuclear power plants and nuclear facilities to monitor site-specific seismic responses. These plants and facilities include

(a) existing nuclear power plants and on-site nuclear facilities (e.g., spent fuel bays, dry fuel storage) (see Clause 4);

Note: "On-site" generally means within the protected area.

(b) new nuclear power plants and on-site nuclear facilities (e.g., spent fuel bays, dry fuel storage) (see Clause 5);

(c) new small reactors and on-site nuclear facilities (see Clause 6);

(d) new enriched fuel processing, fabrication, and storage facilities (see Clause 7); and

(e) new high- and intermediate-level radioactive waste storage facilities not in proximity to a nuclear power plant (see Clause 7).

Notes:

(1) "Existing nuclear power plants and nuclear facilities" refers to those licensed for operation prior to the publication date of this Standard.

(2) The requirements for new builds and existing plants might differ. Where requirements differ for new builds and existing plants, the difference is explicitly stated.

(3) "In proximity to" generally means either within the protected area or so close that the authority having jurisdiction (AHJ) judges that the instrumentation requirement in this Standard is satisfied by the instrumentation existing at the nuclear power plant.

Purpose

Where required to be installed, the purpose of seismic instrumentation is to

(a) measure the seismic response of the nuclear power plant or nuclear facility to the seismic ground motion;

(b) provide seismic motion parameters that can be used to determine whether the seismic design basis has been exceeded;

(c) generate seismic motion parameters that can be used in conjunction with inspections and testing of SSCs to determine whether the facility can continue operating; and

(d) provide input for validation of the dynamic analysis, as defined in CSA N289.3, of SSCs.

Notes:

(1) Nuclear power plant post-seismic response procedures (see Clause 6.5 of CSA N289.1) detail the inspections and testing requirements for safe shutdown, maintenance of fuel cooling, containment integrity, and monitoring.

(2) Annex A outlines criteria for seismic design basis exceedence of facility SSCs.