Document: NUREG-0800
Document ID: 67e3fd64-e6a4-4522-b90f-4184c2f5b357
Document Type: srp
Title: FUNCTIONAL DESIGN OF CONTROL ROD DRIVE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070540139.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.6
CFR Part: 
CFR Title: 

Content:
al specifications and SRP Sections 14 and 15. 5. The reactivity control systems are evaluated to verify that redundant reactivity control systems are not vulnerable to common mode failures. The review identifies the common mode failures and evaluates transient and accident analyses under SRP Sections 7.4, 3.9.4, and 9.3.4 or 9.3.5. 4.6-10 Revision 2 - March 2007 6. For BWR plants that have a scram discharge volume (SDV), the reviewer evaluates the system capabilities and controls to verify that the design of the SDV and its associated systems satisfies the guidance and criteria contained in the NRC BWR scram discharge safety evaluation report (SER). For BWR plants without an SDV, the guidance and criteria specific to the SDV portions of the system would not apply; however, one of the issues addressed within the SER is the response of the CRDS to a slow loss of control air pressure in the scram system. For BWR plants without an SDV, the reviewer should verify that the design incorporates features to prevent the loss or impairment of the scram function resulting from a slow loss of control air pressure in the system. 7. For BWRs, the reviewer evaluates the alternate rod injection systems in regard to the rod control drive systems to verify that the systems have the capability for automatic insertion of all rods by an independent and diverse (from the reactor protection system) method as necessary for mitigation of an ATWS. The evaluation of the alternate rod injection systems includes verification of the use of redundant scram air header exhaust valves. 8. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified