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:
perating map for boiling water reactor (BWR) plants or the temperature-power operating map for pressurized water reactor (PWR) plants. For new plant applicants, the review determines the acceptability of analyses and procedures related to thermal-hydraulic conditions under shutdown and low-power operations.5 The review also includes determination of the largest hydraulic loads on core and reactor coolant system components during normal operation and postulated design-basis accident conditions. 6 This information is used in the review of fuel holddown requirements. The review also determines the acceptability of analyses and emergency procedures related to core thermal-hydraulic stability under conditions representative of anticipated transients without scram (ATWS) events.7 To accomplish the objectives, the reviewer examines features of core and RCS components, 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 in the manner specified by topical reports describing the methods and by staff reports approving the methods. The analysis methods addressed are to include core thermal-hydraulic calculations to establish local coolant conditions, departure from nucleate boiling 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. A secondary review is performed by ICSB, HFEB, and PTRB. ICSBSRXB will review the 8 functional