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:
omponents 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 to a ventilation duct exhausting from the plant for normal system operation when the probability of releases of radiological materials are minimal. F. Means of resin strainers in return lines to the reactor system or condensate system that are capable of removing resin particles contained in demineralizer effluents. G. Means to prevent inadvertent opening of the filter / demineralizer backwash valves during normal operation. 3. To meet the requirements of GDC 1 and 2, Regulation Position C.2.c of Regulatory Guide 1.26 and C.1, C.2, C.3, and C.4 of Regulatory Guide 1.29 are applicable so that the portion of the RWCS extending from the reactor vessel and recirculation loops to the outermost drywell isolation valves should be designed to seismic Category I and Quality Group A. The remainder of the system outside the primary containment should be designed to Quality Group C and need not be seismic Category I. The precoating unit for demineralizers need not be designed to Quality Group C and need not be seismic Category I. 4. The RWCS should include equipment for monitoring: A. System effluent to ensure the conductivity is below the threshold for immediate reactor shutdown. Instrumentation should have sufficient range to measure conductivities up to the value requiring immediate shutdown of the reactor. B. Temperature upstream of the demineralizer, to ensure the ion exchange resin temperature limits are not exceeded. C. Differential pressure, to ensure the design limits on filter/ demineralizer septums and resin strainers are not exceeded. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with GDC 1 requires that structures,