Document: NUREG-0800
Document ID: c543c347-16c6-4d28-9086-792635d04c4a
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340634.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
CFR Part: 
CFR Title: 

Content:
sting program not previously reviewed should be evaluated. 2. The design criteria presented should be evaluated for both the internal pressure-containing portions and other portions of the CRDS. These include the CRDM housing, hydraulic control unit, condensate supply system and scram discharge volume, and portions such as the cylinder, tube, piston, and collect assembly. Of particular concern are any new and unique features which have not been used in the past. Pressure-containing components are checked to ensure that they meet the design requirements of the codes and criteria which have been accepted by the Mechanical Engineering Branch, and are identified in Standard Review Plan Section 3.2.2. The review of the functional design of reactivity control systems, including control rod drive systems, is the responsibility of the Reactor Systems Branch (RSB) (see SRP Section 4.6). The loading combinations for the various plant operating conditions are checked for consistency with Reference 12; given these loading combinations, the stress limits of the appropriate code should not be exceeded, or the limits in Reference 12 should not be exceeded if not specified in the listed design code. Exceptions taken by the applicant to any of the accepted codes, standards, or NRC criteria must be identified and the basis clearly justified so that evaluation is possible. Engineering judgment, experience, comparisons with earlier 3.9.4-5 Rev. 2 - April 1984 cases and design margins, and consultation with supervisors permit the reviewer to reach a decision on the acceptability of any exceptions posed by the applicant. The choice of structural materials of construction for the CRDS is reviewed by the MTEB in SRP Section 4.5.1. 3. Loading combinations are defined as those loadings associated with plant operations which are expected to occur one or more times during the life- time of the plant and include but are not limited to loss of power to all recirculation pumps, tripping of the