Document: NUREG-0800
Document ID: 825fe003-d78e-433f-8e46-8e2cb989ac88
Document Type: srp
Title: FUNCTIONAL DESIGN OF CONTROL ROD DRIVE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340589.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.6
CFR Part: 
CFR Title: 

Content:
reactivity control system are conservative with respect to the parameters assumed in the Chapter 15 analyses. In the Chapter 15 review, the RSB verifies that no credit has been taken for the RFCS (in BWRs) to mitigate any accident. (Although the RFCS controls reactor power level over a limited range, it is not required for shutdown.) In addition, RSB reviews the operation of the RFCS to confirm that a malfunction or failure of the system will not degrade the capabilities of plant safety systems or lead to plant conditions more severe than those considered in the accident analyses (e.g., by determining the effects of a failure of the system following a loss-of-coolant accident or steam line break). The RSB reviews the results of the most limiting transient from a malfunction of the RFCS as part of its primary review responsibility for SRP Section 15.4.5. For those areas of review identified above as being the responsibility of other branches, the acceptance criteria and their methods of application are contained in the SRP sections corresponding to those branches. 4.6-2 Rev 1 - July 1981 II. ACCEPTANCE CRITERIA Acceptability of the information presented in Section 4.6 of the applicant's safety analysis report (SAR), including related sections, is based on meeting the general design criteria. The acceptance criteria for the areas of review are the following: 1. General Design Criterion 23, "Protection System Failure Modes," as related to failing into a safe state. 2. General Design Criterion 25, "Protection System Requirements for Reactivity Control Malfunctions," as related to the functional design of redundant reactivity systems to assure that specified acceptable fuel design limits are not exceeded for malfunction of any reactivity control system. 3. General Design Criterion 26, "Reactivity Control System Redundancy and Capability," as related to the capability of the reactivity control system to regulate the rate of reactivity changes resulting from operational