Document: NUREG-0800
Document ID: a20ea81d-33c2-4a0c-a3b4-216d45d6fccd
Document Type: srp
Title: FEEDWATER SYSTEM PIPE.BREAKS INSIDE AND OUTSIDE CONTAINMENT (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350148.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.8
CFR Part: 
CFR Title: 

Content:
side containment. However, this may not be the most conservative assumption. For example, 15.2.8-4 Rev. 1 - July 1981 maximum initial core flow results in increased reactor coolant system cooldown and depressurization, decreased shutdown margin, and an increased possibility that the core will become critical and return to power. Since it is not clear what initial core flow is most conservative, the applicant's assumption should be justified by appropriate sensitivity studies. h. During the initial 10 minutes of the transient, should credit for operator action be required (i.e., RCP trip), an assessment for the limiting consequence must be performed in order to account for operator delay and/or error. II2. REVIEW PROCEDURES The procedures below are used during reviews of both construction permit (CP) and operating license (OL) applications. During the CP review the values of system parameters and setpoints used in the analysis will be preliminary in nature and subject to change. At the OL review stage, final values should be used in the analysis, and the reviewer should compare these to the limiting safety system settings included in the proposed technical specifications. The values of system parameters and initial core and system conditions used as input to the model are reviewed by RSB and are compared to the initial condi- tions listed in subsection 11 of this SRP section. Of particular importance are the reactivity coefficients and control rod worths used in the applicant's analysis and the variation of moderator temperature, void, and Doppler coeffi- cients of reactivity with core life. The justification provided by the appli- cant to show that he has selected the core burnup that yields the minimum margins is evaluated. CPB is consulted regarding the values of reactivity parameters used in the applicant's analysis. Analytical models should be of sufficient detail to simulate the reactor coolant (primary), steam generator (secondary), and auxiliary systems. The