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:
d shutdown condition; 5) the CVCS is relied upon to control RCS water chemistry to maintain the integrity of the RCS pressure boundary; 6) through connections to the RCS a CVCS failure could adversely affect the integrity of the RCS or containment systems; and 7) portions of the CVCS may contain radioactive material. Meeting the requirements of GDC 1 (and the guidance of RG 1.26) ensures that the CVCS will be designed, fabricated, erected and tested to generally accepted and recognized codes and standards that are sufficient to assure a quality system in keeping with the importance of the designated safety functions. 2. GDC 2 requires that SSCs important to safety be designed to withstand the effects of natural phenomena without the loss of capability to perform their safety functions. Certain portions of the CVCS may have functions important to plant safety that should be designed to withstand the safe shutdown earthquake (SSE). RG 1.29 provides guidance for determining which systems should be designated Seismic Category I; position C.1 provides guidance for safety related portions and position C.2 provides guidance for nonsafety related portions. For example, the CVCS connects to the RCS, and components that form interfaces between Seismic Category I and non-Seismic Category I features should be designed to Seismic Category I requirements. Meeting the requirements of GDC 2 (and the guidance of RG 1.29) will enhance plant safety by ensuring the integrity of Seismic Category I portions of the system during a design basis seismic event. 3. GDC 5 prohibits the sharing of SSCs among nuclear power units unless it can be shown that such sharing will not significantly impair their ability to perform their safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. The CVCS may be designed to provide essential safety-related functions necessary for continued safe operation of the unit(s), such as the