Document: NUREG-0800
Document ID: 126ade1c-f71d-4438-bb61-4fb69648889d
Document Type: srp
Title: CONTROL ROD MISOPERATION (SYSTEM MALFUNCTION OR OPERATOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070714.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.3
CFR Part: 
CFR Title: 

Content:
ERROR) REVIEW RESPONSIBILITIES Primary - Core Performance Branch (CPB)Reactor Systems Branch (SRXB)1 Secondary - None I. AREAS OF REVIEW CPBSRXB reviews the following: 2 1. The types of control rod misoperations that are assumed to occur. For a pressurized water reactor (PWR), this may include one or more rods moving or displaced from normal or allowed control bank positions (such as dropped rods and rods left behind when inserting or withdrawing banks, or single rod withdrawal) and may include the automatic control system attempting to maintain full power. For a boiling water reactor (BWR) with current modes of control rod operation, limiting anomalies are reviewed under SRP Sections 15.4.1 and 15.4.2, and no additional areas are considered here.3 2. Descriptions of rod position, flux, pressure, and temperature indication systems, and those actions initiated by these systems (e.g., turbine runback, rod withdrawal prohibit, rod block) which can mitigate the effects or prevent the occurrence of various misoperations. Those safety systems required to prevent misoperations, as required by General Design Criterion 25, as well as the control rod system are reviewed in SRP Sections 7.2 and 7.7. DRAFT Rev. 3 - April 1996 15.4.3-2 The purpose of the review is to determine what events are to be included as single error malfunctions (e.g., examine single rod withdrawal).4 3. Descriptions of the sequence of events occurring during each transientanticipated operational occurrence (AOO), e.g., rod drop followed by automatic return to full power 5 with possible power overshoot, including the effect of important feedback mechanisms and trips. 4. Descriptions of the calculational models used and justification of their validity and adequacy. 5. The input to the calculations, including rod worths, power distributions, and feedback coefficients and evidence of the conservatism of the input. 6. Results of the analyses includinge, for each of the transientsAOOs considered, plots of 6