Document: NUREG-0800
Document ID: 6d9458c8-25fc-47c7-8406-acd4365b1d3c
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A472.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
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Content:
henomena such as earthquakes. Information in the areas noted below is provided in the applicant’s safety analysis report and is reviewed by the primary review branch in accordance with this Standard Review Plan (SRP) section. This information pertains to the CRDS, which is considered to extend to the coupling interface with the reactivity control elements in the reactor pressure vessel. For electromagnetic systems, the review under this SRP section is limited to just the CRDM portion of the CRDS. For hydraulic systems, the review covers the CRDM and also the hydraulic control unit, the condensate supply system, and the scram discharge volume. For both types of systems, the CRDM housing should be treated as part of the RCPB; the relevant mechanical engineering information is presented either in this SRP section or by reference to the sections on the RCPB. CRDS components internal to the reactor vessel assembly of small modular reactors (SMRs) are not part of the pressure boundary, and therefore the areas of review are somewhat different than those for conventional pressurized water reactors (PWRs). However, any cables or cable bundles connected to motors or actuators of the CRDMs that enter the reactor vessel through penetration(s) must meet appropriate acceptance criteria. CRDS components internal to a vessel assembly, including the CRDMs, are exposed to primary coolant flow, and corresponding temperature- and flow-induced loads. Section 3.9.4, “Control Rod Drive Systems,” of the Design-Specific Review Standard (DSRS) for the Babcock and Wilcox (B&W) mPower iPWR Design (issued for interim use and comment and available at Agencywide Documents Access and Management System (ADAMS) Accession No. ML12272A020) provides additional guidance for review of the mPower iPWR Design CRDS. Also, mechanical and acoustic pulsations from other major reactor components, including valves and reactor recirculation pumps (RRPs), should be considered in the CRDS design. Evaluation