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:
m 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 shown that such sharing will not significantly impair their ability to DRAFT Rev. 4 - April 1996 5.4.6-8 perform their safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. The RCIC system provides essential cooling water necessary for decay heat removal. The RCIC system needs to be designed such that the ability to accomplish these safety-related functions are not compromised for each unit regardless of equipment failures or other events that may occur in another unit. Meeting the requirements of GDC 5 provides assurance that unacceptable effects of equipment failures or other events occurring in one unit of a multi-unit site will not propagate to the unaffected unit(s). 3. GDC 29 establishes requirements that the protection and reactivity control systems be designed to assure an extremely high probability of accomplishing their safety functions in the event of anticipated operational occurrences. The RCIC system provides a standby source of cooling water and limited decay heat removal capability whenever the main feedwater system is isolated from the reactor vessel. This system can mitigate the consequences of anticipated operational occurrences such as loss of feed water, inadvertent isolation of main steam, or loss of offsite power; therefore, it must have an extreme high probability of accomplishing its function. The reactor protection or engineered safety features (ESF) system activates initiation of the RCIC system during appropriate anticipated operational occurrences. The RCIC interface with this system is to be designed to continue this extremely high probability of accomplishing its safety functions. Application of GDC 29 provides assurance that specified acceptable fuel design limits