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:
coolant pressure boundary overpressurization. Because the RCIC system, in conjunction with the HPCS (or HPCI) system, provides makeup inventory in some modes of RHR, these systems should jointly meet the guidelines of Branch Technical Position (BTP) 5-4, “Design Requirements of the Residual Heat Removal System.” 2. The RCIC system also supplies reactor coolant makeup for small leaks. Accordingly, the system must meet the relevant requirements of GDC 33. 3. Historically, credit has been taken for the RCIC system capability to mitigate the consequences of certain abnormal events; however, because the cooling function is redundant to the HPCI, HPCS, or HPCF system, the RCIC system itself is not required to meet the single failure criterion, but it must do so in conjunction with the HPCS, HPCI, or HPCF system. In addition, the RCIC system must perform its function without the 5.4.6-6 Revision 2 - March 2007 availability of any alternating current (ac) power, per the requirements of GDC 34, and, in conjunction with the HPCS, HPCI, or HPCF system, must be designed to ensure an extremely high probability of accomplishing its safety function, as required by GDC 29. 4. As a system that must respond to certain abnormal events, the design of the RCIC system must conform to seismic Category I standards (as discussed in SRP Section 3.2.1), and must not be shared among nuclear power units, except as permitted by GDC 5. 5. The RCIC system and the HPCS, HPCI, or HPCF system must be protected against natural phenomena, external or internal missiles, pipe whip, and jet impingement forces so that such events cannot cause both systems to fail simultaneously. SRP Sections 3.3.1 through 3.6.2 discuss relevant acceptance criteria. 6. The RCIC system must meet the requirements of GDC 54 regarding leak detection and isolation provisions for lines passing through the primary containment. SRP Sections 6.2.4 and 6.2.6 describe other containment isolation criteria for the RCIC system. 7.