Document: NUREG-0800
Document ID: 042bc5c0-5de0-44b4-9599-6c131e20eb7a
Document Type: srp
Title: FUNCTIONAL DESIGN OF CONTROL ROD DRIVE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070413.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.6
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - AuxiliaryReactor Systems Branch (ASBSRXB)1 Secondary - NonePlant Systems Branch (SPLB)2 I. AREAS OF REVIEW The ASBSRXB reviews the functional performance of the control rod drive system (CRDS) to 3 confirm that the system can effect a safe shutdown, respond within acceptable limits during anticipated transientsoperational occurrences , and prevent or mitigate the consequences of 4 postulated accidents. The ASBSRXB review covers the CRDS to assure conformance with the 5 requirements of General Design Criteria 4, 23, 25, 26, 27, 28, and 29 and 10 CFR 50.62(c)(3). 6 7 1. ASBSRXB reviews the CRDS design for possible single failures. 8 2. ASBSRXB reviews the CRDS to verify that: 9 a. Essential portions are isolablecan be isolated from nonessential portions. 10 b. The CRDS cooling system meets the design requirements. c. The functional tests verify the proper rod insertion, withdrawal, and scram operation times. d. Redundant reactivity control systems are not vulnerable to common mode failures. DRAFT Rev. 2 - April 1996 4.6-2 Review Interfaces:11 SRXB also performs the following reviews under the SRP sections indicated:12 1. The RSBSRXB reviews all transient and accidents in Chapter 15 of the SAR that 13 require reactivity control systems to function. The RSBSRXB , with the CPB and 14 15 Instrumentation and Controls Branch (HICB)ICSB , ascertains that the reactivity and 16 response characteristics of the reactivity control system are conservative with respect to the parameters assumed in the Chapter 15 analyses. In the Chapter 15 review, the RSBSRXB verifies that no credit has been taken for the Recirculation Flow Control 17 System (RFCS) (in BWRs) to mitigate any accident. (Although the RFCS controls 18 reactor power level over a limited range, it is not required for shutdown.) In addition, RSBSRXB reviews the operation of the RFCS to confirm that a malfunction or failure 19 of the system will not degrade the capabilities of plant safety