Document: NUREG-0800
Document ID: a4637484-a66d-4066-b2e7-77b0ea7d3187
Document Type: srp
Title: 2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070601.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.9.16
CFR Part: 
CFR Title: 

Content:
pleting normal shutdown in the event of a component failure in one reactor.53 4. GDC 44 requires that a system be provided to transfer heat from structures, systems, and components important to safety to an ultimate heat sink. The safety function of this system shall be to transfer the specified combined heat load under normal operating and accident conditions. Suitable redundancy in components and features, as well as suitable interconnections, leak detection, and isolation capabilities, shall be provided to ensure that the system safety function can be accomplished for loss of either onsite or offsite power assuming a single failure. GDC 44 applies to SRP Section 10.4.7 because the review establishes that the CFS is capable of providing heat removal from the reactor system during normal conditions. For PWRs, the auxiliary feedwater system provides heat removal during accident conditions involving loss of normal feedwater. (The auxiliary feedwater system is evaluated under SRP Section 10.4.9.) For BWRs, the reactor core isolation cooling system provides heat removal during accident conditions involving loss of normal feedwater. (The reactor core isolation cooling system is evaluated under SRP Section 5.4.6.) Review of the CFS is coordinated with those of alternate feedwater systems and addresses redundancy, interconnections, leak detection, and isolation capabilities to establish that containment isolation can be accomplished during accidents that occur concurrently with loss of onsite or offsite power and a single failure. Meeting the requirements of this criterion provides a level of assurance that the capability for heat removal from the reactor will be retained during normal and accident conditions, thus protecting fuel cladding from elevated temperatures.54 5. GDC 45 requires that the cooling water system shall be designed to permit appropriate periodic inspection of important components (e.g., heat exchangers and piping) to ensure the integrity and capability