Document: NUREG-0800
Document ID: 1877a6e5-f5a2-4394-bd63-c323831e96d0
Document Type: srp
Title: INTRODUCTION - TRANSIENT AND ACCIDENT ANALYSES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2231/ML22319A149.pdf
Revision Date: 2023-07
Chapter: 15
Section ID: 15.0
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CFR Title: 

Content:
fer due to the insulating effect of a vapor blanket that forms on the rod surface, divided by the actual local heat flux. 15.0-16 Draft Revision 4 – July 2023 DEFINITIONS (CONTINUED) Term Definition design-basis Information that identifies the specific functions to be performed by a structure, system, or component of a facility, and the specific values or ranges of values chosen for controlling parameters as reference bounds for design. These values may be (1) restraints derived from generally accepted state of the art practices for achieving functional goals, or (2) requirements derived from analysis (based on calculation and/or experiments) of the effects of a postulated accident for which a structure, system, or component must meet its functional goals. design-basis accidents Postulated accidents that are used to set design criteria and limits for the design and sizing of systems and components important to safety, including safety-related SSCs. design-basis events Conditions of normal operation, including AOOs, design-basis accidents, external events, and natural phenomena, for which the plant must be designed and analyzed. loss-of-coolant accident (LOCA) A postulated accident that results in the loss of reactor coolant at a rate in excess of the replacement capability of the reactor coolant makeup system. overpressurization The condition that occurs when the pressure increase for a given event exceeds an acceptance criterion established by acceptable means for maximum pressure associated with that event. postulated accidents Conditions of operation not expected to occur during the life of the nuclear power unit for which a structure, system, or component must meet its functional goals. protection system A system to (1) automatically initiate the operation of appropriate systems including the reactivity control systems, to assure that specified acceptable fuel design limits are not exceeded as a result of anticipated operational occurrences and (2) sense