Document: NUREG-0800
Document ID: 145ec0f9-012b-4669-9627-ed1b1d0cce95
Document Type: srp
Title: THERMAL AND HYDRAULIC DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070412.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.4
CFR Part: 
CFR Title: 

Content:
trapolation of other thermal-hydraulic designs. The review does not routinely involve calculations by the staff. However, the reviewer should ensure that those applications based on statistical design methodologies include the coefficients required by the statistical model and define the parameter ranges for which the coefficients are applicable. Uncertainties in computer codes, correlations, design methods, and set point methodologies should be quantified and the method(s) of accounting for these uncertainties in the design procedures should be discussed. For example the sensitivity factors and their ranges of applicability must be reviewed for those plants utilizing the Westinghouse "Improved Thermal Design Procedure," (Ref. 19Reference 30) . On occasion, e.g., if a new design or new 53 design method is proposed, independent analyses are performed by the staff or by consultants under the direction of CPB SRXB . These analyses verify the design or establish the range of 54 applicability and associated accuracy of the new method and the reviewer ensures it is applied accordingly. The reviewer should evaluate the design of software used in core protection systems. The review should establish the acceptability of the software by comparison with previously approved designs and assess any differences with regard to effects on the system performance and safety functions. Consistency of the core protection algorithms and logic functions with the thermal-hydraulic analyses should be verified along with the program for implementing the software. Confirmation of adequate software implementation should be based on documented testing that verifies the acceptability of the software calculational systems, the proper integration of software and hardware systems, and the acceptable static and dynamic operation of the integrated system when compared with the predictions of the thermal-hydraulic design analyses. The reviewer should consult with HICB concerning the design