Document: NUREG-0800
Document ID: d4d35b7c-b4e5-4cb4-8dd9-1b7edddf0ad6
Document Type: srp
Title: CHEMICAL AND VOLUME CONTROL SYSTEM (PWR) (INCLUDING BORON
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070537.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.4
CFR Part: 
CFR Title: 

Content:
ntration is determined by filtration through a filter having a 0.45-micrometer (micron) pore size.55 DRAFT Rev. 3 - April 1996 9.3.4-12 6. The adequacy of resin over-temperature protection is verified by reviewing the system description and drawings to determine that temperature sensors are provided that will actuate the demineralizer bypass or isolation valves. Also, verify that instrumentation is available to monitor filter demineralizer differential pressure. 7. The boron thermal regeneration subsystem is reviewed to determine the maximum change in primary coolant boron concentration due to equipment or control errors as determined from failure modes and effects analyses. 8. The operating procedures and controls for boron addition and primary coolant dilution are reviewed for adequacy. 9. The system P&IDs are examined to determine that all components and piping that can contain boric acid will either be heat traced or will be located within heated rooms to prevent precipitation of boric acid. 10. The application is reviewed with respect to establishing a leakage control reduction program, for those portions of the CVCS located outside containment that may contain radioactive material following an accident, in accordanceconsistent with item III.D.1.1 of NUREG-0737. (OL applications) or NUREG-0718 (CP applications).56 11. The CVCS low pressure or holdup tanks that can contain primary system water are reviewed to assure adequate measures have been taken to protect against vacuum conditions that could result in tank damage (see Reference 17). With respect to the prevention of vacuum conditions in system tanks, the reviewer should consider the following: (a) tanks with a cover gas are able to admit the cover gas fast enough to keep up with the maximum rate of liquid removal; (b) vacuum relief valves are included in a surveillance program; and (c) tanks subject to freezing conditions have adequate freeze protection for the tank and the vacuum relief system.57 12. The