Document: NUREG-0800
Document ID: c766e34e-6ea5-45e7-9123-75964d118447
Document Type: srp
Title: REACTOR CORE ISOLATION COOLING SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070540102.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.6
CFR Part: 
CFR Title: 

Content:
that include (or might include) radioactive source term materials following an accident. The regulations at 10 CFR 50.34(f)(2)(xxvi) establish an equivalent requirement for those applicants subject to the requirements of 10 CFR 50.34(f). 5.4.6-7 Revision 2 - March 2007 8. If the RCIC system is used to control or mitigate the consequences of an accident, either by itself or as a backup to another system, it must meet the requirements of an engineered safety feature (ESF). The RCIC system should have adequate martgin with the containment at atmospheric pressure. 9. To satisfy the requirements of GDC 4, design features and operating procedures that are designed to prevent damaging water hammer attributable to mechanisms such as voided discharge lines, steam bubble collapse, and water entrainment in steamlines shall be provided. 10. If the RCIC system supports the demonstration of adequate plant SBO coping capability as required by 10 CFR 50.63, acceptance may be based on the positions in Regulatory Guide 1.155 regarding RCIC system design. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 4 requires, in part, that structures, systems, and components important to safety shall be designed to (1) accommodate the effects of, and be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents and (2) be appropriately protected against dynamic effects - including the effects of missiles, pipe whipping, and discharging fluids - that may result from equipment failures and external events. The RCIC system - in conjunction with the HPCS (or HPCI) system, the SRVs, and the suppression pool cooling mode of the RHR system - provides the cooling water necessary for decay heat removal, but the dynamic effects of water hammer could degrade system effectiveness. Compliance with GDC