Document: NUREG-0800
Document ID: 18897384-49d0-41ca-b285-0b1201052b03
Document Type: srp
Title: CONTROL ROD MISOPERATION (SYSTEM MALFUNCTION OR OPERATOR ERROR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350372.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.3
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Core Performance Branch (CPB) Secondary - None I. AREAS OF REVIEW CPB reviews the following: 1. The types of control rod misoperations that are assumed to occur. For a pres- surized water reactor (PWR), this may include one or more rods moving or dis- placed 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. 2. Descriptions of.rod position, flux, pressure, and temperature indication sys- tems, 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. The purpose of the review is to determine what events are to be included as single error malfunctions (e.g., examine single rod withdrawal). 3. Descriptions of the sequence of events occurring during each transient, e.g., rod drop followed by automatic return to full power with possible power over- shoot, including the effect of important feedback mechanisms and trips. 4. Descriptions of the calculational models used and justification of their validity and adequacy. Rev. 2 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and