Document: NUREG-0800
Document ID: 2349ea77-1f6e-45e4-a2df-f56249a774f1
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070364.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 DRAFT Rev. 3 - April 1996 3.9.4-8 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 (RSBSRXB) (see SRP 48 Section 4.6). The loading combinations for the various plant operating conditions are checked for consistency with Reference 12SRP Section 3.9.3 ; given these loading 49 combinations, the stress limits of the appropriate code should not be exceeded, or the limits in Reference 12SRP Section 3.9.3 should not be exceeded if not specified in the 50 listed design code. For BWR control rod drive systems which include 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 Reference 13 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 emergency actions in response to detected leakage to adequately address prevention and mitigation of the effects of leakage associated with potential failures of this piping.51 For BWR control rod drive systems