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:
Guide 1.26 (reference 1) and regulatory posi- tions C.1, C.2, C.3, and C.4 in Regulatory Guide 1.29 (reference 2), 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 provisions for monitoring: a. System effluent conductivity. Instrumentation should be consistent with the regulatory positions on instrumentation in Regulatory Guide 1.56 (reference 3). b. Temperature upstream of the demineralizer, to assure the ion exchange resin temperature limits are not exceeded. c. Differential pressure, to assure the design limits on filter/ demineralizer septums and resin strainers are not exceeded. III. REVIEW PROCEDURES The reviewer will select and emphasize material from this SRP section, as may be appropriate for a particular case. 1. CMEB reviews the system description and piping and instrumentation diagrams (P&IDs) to determine the processing sequence, interconnections with other systems, and similarity to systems previously evaluated, and establishes that the following are considered in the applicant's design: a. Provisions to automatically terminate flow to the RWCS following liquid poison injection into the reactor water. b. Provisions to automatically terminate flow to the cleanup deminera- lizers if the nonregenerative heat exchanger effluent temperature exceeds the resin operating temperature limits. c. Provisions for automatically maintaining flow through filter/ demineralizer units in the event system flow decreases to a point where the bed may drop from the septum. d. Provisions for monitoring resin transfers to assure transfers are