Document: NUREG-0800
Document ID: 087cef2c-a084-4143-84b9-9f1ba68e1851
Document Type: srp
Title: MASS AND ENERGY RELEASE ANALYSIS FOR POSTULATED SECONDARY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340662.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.4
CFR Part: 
CFR Title: 

Content:
cies. Standard review plans are not substitutes for regulatory guides or the Commission's regulations and compliance with them Is not required. The stndard revw plan sections are keyed to the Standard Format and Content of Safety Analysh Reports for Nuclear Power Plants. Not aU sections of the Standard Format have a corresponding review plan. Published standard review plans will be revised periodically. as appropriate. to accommodate comments and to reflect new Informa- tion and experience. Comments and suggestions for Improvement will be considered and should be sent to the U.S. Nuclear Regulatory Commission. office of Nuclear Reactor Regulation. Washington, D.C. 2555 and energy release analysis for postulated PWR secondary system pipe ruptures to assure that the containment design margin is maintained. Specific criteria necessary to meet the relevant requirements of GDC 50 are as follows: 1. Sources of Energy The sources of energy that should be considered in analyses of steam and feedwater line break accidents include: the stored energy in the affected steam generator's metal, including the vessel tubing, feedwater line, and steam line; the stored energy in the water contained within the affected steam generator; the stored energy in the feedwater transferred to the affected steam generator prior to closure of the isolation valves in the feedwater line; the stored energy in the steam from the unaffected steam generator(s) prior to the closure of the isolation valves in the steam generator crossover lines; and the energy transferred from the primary coolant to the water in the affected steam generator during blowdown. The steam line break accident should be analyzed for a spectrum of pipe break sizes and various plant conditions from hot standby to 102% of full power. Only the 102% power condition need be analyzed provided the applicant can demonstrate that the feedwater flows and fluid inventory are greatest at full power. 2. Mass and Energy Release Rate