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
CFR Part: 
CFR Title: 

Content:
counting for any mechanically induced forces on the CRDS components, such as those from the RRPs, should also be provided. Finally, criteria that address any flow-induced acoustic resonances elsewhere in the reactor, or in downstream steam lines, should be specified. The review of the functional design of reactivity control systems, including CRDS, is performed as part of the review of SRP Section 4.6. The loading combinations for the various plant operating conditions are reviewed as part of the review of SRP Section 3.9.3; given these loading combinations, the displacement and stress limits of the appropriate code should not be exceeded, or the limits in SRP Section 3.9.3 should not be exceeded if limits are not specified in the listed design code. For a BWR CRDS that includes a scram discharge volume system, the reviewer verifies that the system piping design meets or exceeds the acceptable owner’s group classifications and criteria discussed in the enclosure to Generic Letter 86-01 to ensure that breaks and through wall cracks in the piping need not be postulated. The reviewer also verifies that acceptable commitments are made regarding associated inspections, periodic visual verification of the scram system piping integrity, and actions in response to detected leakage to adequately address prevention and mitigation of the effects of leakage associated with potential failures of this piping. For a BWR CRDS that includes a control rod drive return line, the reviewer verifies acceptable provisions for the return line design and its implementation in accordance with Generic Letter 80-95 and Part II, Section 8 of NUREG-0619. The choice of structural materials of construction for the CRDS is reviewed in SRP Section 4.5.1. 3. Loading combinations are defined as those loadings associated with plant operations that are expected to occur one or more times during the lifetime of the plant and include, but are not limited to, loss of power to all recirculation pumps,