Document: NUREG-0800
Document ID: 5782f44d-4d34-4048-bf55-d13ffa316faf
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070850410.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10
CFR Part: 
CFR Title: 

Content:
lear Regulatory Commission, Washington, DC 20555, Attention: Reproduction and Distribution Services Section, or by fax to (301) 415-2289; or by email to DISTRIBUTION@nrc.gov. Electronic copies of this section are available through the NRC's public Web site at http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/, or in the NRC's Agencywide Documents Access and Management System (ADAMS), at http://www.nrc.gov/reading-rm/adams.html, under Accession # ML07850410. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 10-1 DESIGN GUIDELINES FOR AUXILIARY FEEDWATER SYSTEM PUMP DRIVE AND POWER SUPPLY DIVERSITY FOR PRESSURIZED WATER REACTOR PLANTS REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of cooling water systems Secondary - None A. BACKGROUND Heat removal from pressurized-water reactor (PWR) plants following reactor trip and a loss of offsite power is accomplished by the operation of several systems including the secondary via the steam relief system. Similar capability is required to mitigate the consequences of certain postulated piping breaks. Such heat removal transfers heat from the reactor to the steam generators, producing steam released to the atmosphere. In this process a supply of makeup water to the steam generators is necessary and accomplished by an auxiliary feedwater system (AFWS), which generally consists of redundant components powered by both electrical and steam-driven sources. The AFWS functions as an engineered safety system because it is the only source of makeup water to the steam generators for decay heat removal when the main feedwater system becomes inoperable. It must, therefore, be designed to operate when needed under the principles of redundancy and diversity so it can function under postulated accident conditions. BTP 10-1-2 Revision 3 - March 2007 Most current systems are powered by electrical or steam-driven sources. Operating experience demonstrates that