Document: NUREG-0800
Document ID: 0b529a75-fd6e-4e39-9791-94f199dfcf56
Document Type: srp
Title: CHEMICAL AND VOLUME CONTROL SYSTEM (PWR) (INCLUDING BORON
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070160660.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.4
CFR Part: 
CFR Title: 

Content:
an extremely high probability of accomplishing their safety functions in the event of anticipated operational occurrences (AOO). Portions of the CVCS may be relied upon to provide negative reactivity addition by injection of boric acid to the RCS, and assures that specified acceptable fuel design limits (SAFDLs) will not be exceeded. Meeting the requirements of GDC 29 enhances plant safety by assuring that the reactivity control aspects of the CVCS will have a high probability of injecting sufficient negative reactivity to prevent exceeding SAFDLs during AOOs, thereby preventing damage to the fuel matrix and cladding. 6. GDC 33 requires that a system be provided to supply reactor coolant makeup for protection against small breaks in the RCPB. The CVCS may be relied upon to provide charging and makeup in the event of small leakage from the RCPB and rupture of small piping or components that are part of the pressure boundary. Meeting the requirements of GDC 33 enhances plant safety by ensuring that the CVCS can provide sufficient makeup capacity to maintain the required RCS water inventory and prevent the violation of SAFDLs given a small break in the reactor coolant pressure. 7. GDC 35 requires that the ECCS safety function can be performed assuming a single component failure coincident with a loss of power. The CVCS may be relied upon to provide ECCS high head injection capability necessary to ensure that emergency core cooling is provided during an accident. One of the functions of the CVCS is to transfer sufficient heat from the core to prevent fuel and clad damage that could interfere with core cooling and to limit the cladding metal-water reaction to negligible amounts. Meeting the requirements of GDC 35 for the applicable portions of the CVCS enhances plant safety by ensuring that sufficient emergency core cooling is provided during design basis accidents, thereby preventing damage to the fuel and cladding that could interfere with core cooling. 8. GDC 60