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:
ctor 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 shutdown. b. Provisions 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 in the event of low process flow or loss of process flow through the system, to prevent bed loss. 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. A statement indicating that consideration will be given in the design to avoid resin traps, e.g., a statement that resin transfer lines will be designed to avoid resins collecting in valves, low points, or stagnant areas, will be acceptable for transfer line designs. e. Provisions 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 SAR should state that vent lines run to a ventilation duct exhausting from the plant. f. Provision, in return lines to the reactor system or condensate system, of resin strainers capable of removing resin particles contained in demineralizer effluents. 5 4.8-4 Rev. 2 - July 1981 3. To meet the requirements of General Design Criteria 1 and 2, the regulatory position C.2.c in Regulatory 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