Document: NUREG-0800
Document ID: 96ddbfc8-7fd0-4a33-9fbe-144d653b6e9f
Document Type: srp
Title: REACTOR CORE ISOLATION COOLING SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070433.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.6
CFR Part: 
CFR Title: 

Content:
66 equivalent requirement for those applicants subject to the requirements of 10 CFR 50.34(f).67 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. The RCIC system must meet the guidelines of Regulatory Guide 1.1 (Ref. 9) regarding net positive suction head. 68 9. In order to meet the requirements of General Design cCriterion 4 (Ref. 12) design 69 features and operating procedures, designed to prevent damaging water hammer due- to 70 such mechanisms as voided discharge lines, steam bubble collapse and water entrainment in steam lines, 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 is based on positions in Regulatory Guide 1.155 regarding RCIC system design.71 Technical Rationale:72 The technical rationale for application of the above acceptance criteria to the reactor core isolation cooling system is discussed in the following paragraphs: 1. GDC 4 requires structures, systems and components that provide essential cooling for safety-related equipment to be designed to accommodate the effects of, and to be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, and to be appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids, that may result from equipment failures and from external events. The RCIC system provides cooling water necessary for decay heat removal and the dynamic effects of water hammer could degrade system effectiveness. Compliance with GDC 4 assures that the RCIC system will remain functional and provide essential cooling necessary for decay heat removal. 2. GDC 5 prohibits the sharing of structures, systems and components among nuclear power units unless it can be