Document: NUREG-0800
Document ID: d0a29cc6-24fb-443d-8b43-655916964d83
Document Type: srp
Title: REACTOR WATER CLEANUP SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340638.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.8
CFR Part: 
CFR Title: 

Content:
designing the RWCS with appropriate confinement. Specific criteria and the positions of Regulatory Guides 1.26, 1.29, and 1.56 are used to meet the relevant requirements of GOC 1, 2, 14, 60, and 61 as follows: 1. The system should be capable of.maintaining acceptable reactor water purity in normal operation and during anticipated operational occurrences, e.g., reactor startup, refueling, and condensate demineralizer breakthrough to assure reactor coolant pressure boundary material integrity in accordance with the requirements of General Design Criterion 14. The following points should be included in the system design: a. The system should be designed to maintain reactor water purity within the guidelines of Regulatory Guide 1.56 (reference 3) and the Technical 5.4.8-3 Rev. 2 - July 1981 Specifications for Water Chemistry of Reactor Coolant System for Boiling Water Reactors. The system should provide demineralization of reactor water through mixed bed resins (beads or powdered) at approximately 1% of the main steam flow rate. b. The nonregenerative heat exchangers should be designed to reduce the cleanup flow temperature to the demineralizer operating temperature when the regenerative heat exchanger cooling capacity is reduced as a result of partially bypassing a portion of the return flow to the main condenser or radwaste system. c. The RWCS should have the capability to permit processing of excess reactor water during startups, shutdowns, and hot standby conditions. Interconnections between the reactor water cleanup and liquid waste and condensate storage systems to share the processing burden are acceptable. d. The RWCS should be designed to permit processing of reactor water during periods of single active component failures or equipment downtime. 2. The reactor water cleanup system should include the following: a. Provisions for automatically isolating the RWCS from the reactor coolant system in the event the liquid poison system is actuated for reactor