Document: NUREG-0800
Document ID: e89cc26c-d19a-42b8-818a-fb598c05ccee
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN FLUID
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340548.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
dized as a consequence of the postulated piping failure. d. SPLB evaluates the applicant's analysis of the postulated failure of non-seismic Category I piping systems by performing a failure modes and effects analysis using SAR information and engineering sketches as necessary. 4. Systems defined in Appendix A to BTP SPLB 3-1 as "essential systems" are those that are needed to shut down the reactor and mitigate the consequences of the pipe break for a given postulated piping break. However, depending upon the type and location of the postulated pipe break, certain safety equipment may not be classed as "essential" for that particular event (e.g., emergency power system or high and low pressure core spray systems). On the other hand, some safety equipment will be "essential" for almost all cases (e.g., service water to ultimate heat sink). Table 3.6.1-1 is a list of those essential systems generally in the latter category. TABLE 3.6.1-1 SYSTEMS USUALLY REQUIRED FOR SAFE SHUTDOWN PWR BWR Service Water System Service Water System Auxiliary Feedwater System Reactor Coolant Injection System Volume Control System Automatic Depressurization System | Decay Heat Removal System Residual Heat Removal System Component Cooling Water System Component Cooling Water System (if provided) Table 3.6.1-2 is a listing of systems typically classified as either high or moderate energy systems that are located outside the primary containment in pressurized water reactor (PWR) and boiling water reactor (BWR) plants. 3.6.1-6 Rev. 2 - October 1990 TABLE 3.6.1-2 TYPICAL HIGH ENERGY SYSTEMS OUTSIDE CONTAINMENT PWR BWR Main Steam Line System Main Feedwater Line System Auxiliary Feedwater System Volume Control System Process Sampling System Condensate System Steam Generator Blowdown Line Main Steam Line System Main Feedwater Line System High Pressure Core Spray System Process Sampling System Condensate System Reactor Cleanup System Standby Liquid Control System TYPICAL MODERATE ENERGY SYSTEMS