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:
ctivity 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 equations, sensitivity studies, and models proposed by the applicant are reviewed by RSB. Credit taken for a reactor trip signal or for actuation of engineered safety features should be reviewed by ICSB to determine the ability of the instrumen- tation and control systems to respond as assumed under accident conditions. The ability of the auxiliary feedwater system to supply adequate feedwater flow to the unaffected steam generators during the accident and subsequent shutdown is evaluated by ASB as to availabilty and by RSB as to capability to effect an orderly shutdown. Since auxiliary feedwater system designs are diverse and may require both automatic and manual actuation, preoperational tests should be specified to identify any necessary operator actions and to determine the maximum times permitted for their completion. To the extent considered necessary, the RSB reviewer evaluates the effect of single active failures of systems and components that may alter the course of the accident. This phase of the review uses the system review procedures described in the standard review plan sections for Chapters 5, 6, 7, 8, and 10 of the SAR. The variations with time during the transient of parameters listed in Sections 15.X.X.3(C) and 15.X.X.4(C) of the Standard Format (Ref. 2) are reviewed. The more important of these parameters for the feedwater line 15.2.8-5 Rev. 1 - July 1981 break accident (as listed in subsection I of this SRP section) are compared to those predicted for other similar plants to see that they are within the expected range. The reviewer confirms that the amount of secondary coolant expelled from the system has been calculated conservatively by evaluating the applicant's methods and assumptions, by comparison with an acceptable analysis performed on