Document: NUREG-0800
Document ID: 8da52d2b-9980-4076-8056-2cafebb25ed6
Document Type: srp
Title: THERMAL AND HYDRAULIC DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550060.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.4
CFR Part: 
CFR Title: 

Content:
ower-flow operating map for boiling-water reactor (BWR) plants or the temperature-power operating map for pressurized-water reactor (PWR) plants. 3. For new plant applicants, the review determines the acceptability of analyses and procedures related to thermal-hydraulic conditions under shutdown and low-power operations. 4. The review determines the largest hydraulic loads on core and RCS components during normal operation and design-basis accident conditions. This information is used in the review of fuel hold down requirements. 5. The review evaluates the uncertainty analysis methodology and the uncertainties of variables and correlations such as CHF and CPR. The review also evaluates the uncertainties associated with the combination of variables. 6. To accomplish the objectives, the reviewer examines core and RCS component features, key process variables for the coolant system, calculated parameters characterizing thermal performance, data serving to support new correlations or changes in accepted correlations, and assumptions in the equations and solution techniques used in the analyses. The reviewer determines that the applicant has used approved analysis methods described in topical reports and applied in staff reports. The analysis methods to be addressed include core thermal-hydraulic calculations to establish local coolant conditions, departure from nucleate boiling (DNB) or boiling transition calculations, and thermal-hydraulic stability evaluation. If an applicant has used previously unapproved correlations or analysis methods, the reviewer initiates an evaluation, either generic or plant specific. Any changes to accepted codes, correlations, and analytical procedures, or the addition of new ones, must be reviewed to determine that they are justified on theoretical or empirical grounds. 7. The reviewer will evaluate the functional performance and requirements for the inadequate core cooling (ICC) monitoring system hardware. 8. Inspections, Tests,