Document: NUREG-0800
Document ID: 73148264-0cb4-4b1b-8586-3105a0a46c78
Document Type: srp
Title: REACTOR WATER CLEANUP SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190009.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.8
CFR Part: 
CFR Title: 

Content:
ve 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 excess reactor water during startups, shutdowns, and hot standby conditions. Interconnections between the reactor water cleanup and liquid waste and condensate storage systems to enable sharing of the processing burden are acceptable. D. The RWCS should be designed to permit processing reactor water during periods of single active component failures or equipment downtime. 2. The reactor water cleanup system should include the following: A. Means for automatically isolating the RWCS from the reactor coolant system in the event the liquid poison system is actuated for reactor shutdown. B. Means for automatically isolating the RWCS in the event the nonregenerative heat exchanger effluent temperature exceeds the prescribed resin operating temperature for the cleanup demineralizer resins. C. Means for automatically maintaining flow through filter / demineralizer beds to prevent bed loss in the event of low process flow or loss of process flow through the system. The recirculation loop and holding pump subsystem provided for precoating can serve this purpose if it is activated on loss of flow or low flow conditions. D. Means of transferring resins. Sight glass provisions (bull's eyes) are acceptable for monitoring resin transfers. Systems should be designed to prevent “resin traps” in sluice lines. Consideration should be given in the design of transfer lines to avoid resin traps; e.g., resin transfer lines may be designed to avoid resins collecting in valves, low points, or stagnant areas. 5.4.8-6 Revision 3 - March 2007 E. Means for draining and venting RWCS components through a closed system (i.e., not to the immediate atmosphere) in accordance with the requirements of General Design Criteria 60 and 61. The system design should include vent lines that run