Document: NUREG-0800
Document ID: 2717fe7f-71fd-4f1e-bd08-7685b24763ba
Document Type: srp
Title: Standard Review Plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for th
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0301/ML030160606.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15
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CFR Title: 

Content:
relate the shearing stresses to the rate of strain (the velocity field). Constitutive Equations and correlations required to close the field equations so Equations that they may be solved. They relate unknown quantities to the variables of the field equations. They may include physical correlations of transport phenomena such as equations that relate the shearing stresses to the rate of strain (the velocity field). CPR Critical Power Ratio - The ratio of assembly power at which critical heat flux occurs to the actual assembly power. CSAU Code Scaling, Applicability, and Uncertainty - A process to determine the applicability, scalability, and uncertainty of a computer code in simulating an accident or other transient. A PIRT process is normally imbedded within a CSAU process. See Reference 1. DG-1120 Draft Regulatory Guide DG-1120, “Transient and Accident Analysis Methods” [Ref. 2]. DNBR Departure from nucleate boiling ratio. ECCS Emergency core cooling system. Empirical Derived from experimental data without recourse to physical modeling. Evaluation Model Calculational framework for evaluating the behavior of the reactor (EM) system during a postulated Chapter 15 event, which includes one or more computer programs and all other information needed for use in the target application. Field Equations Equations that are solved to determine the transport of mass, energy and momentum throughout the system. Figures of Merit Quantitative standards of acceptance that are used to define acceptable answers for a safety analysis (e.g., DNBR limits and fuel temperature limits). frozen The condition whereby the analytical tool(s) and associated facility input decks remain unchanged (and under configuration control) throughout a safety analysis thereby ensuring traceability of, and consistency in, the final results. GDC General Design Criteria - Design criteria described in Appendix A to 10 CFR Part 50. 18 HEM Homogeneous Equilibrium Model - An analytical model for two-phase