Document: NUREG-0800
Document ID: 577b52cf-90e2-467e-8165-a1ce02957947
Document Type: srp
Title: REACTOR WATER CLEANUP SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070438.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.8
CFR Part: 
CFR Title: 

Content:
, C.3, 51 and C.4 in Regulatory Guide 1.29 (reference 2), are applicable so that the portion of the 52 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. 5.4.8-7 DRAFT Rev. 3 - April 1996 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).53 b. Temperature upstream of the demineralizer, to assure 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 Rationale54 The technical rationale for application of these acceptance criteria to reviewing the reactor water cleanup system is discussed in the following paragraphs:55 A. Compliance with GDC 1 requires that structures, systems, and components important to safety shall be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed. GDC 1 applies to the RWCS because the system is connected directly to the reactor coolant system and contains reactor coolant and radioactive demineralizer resins. Failure of a component of the system could result in a loss-of-coolant accident, release of reactor coolant outside the containment structure, and/or release of demineralizer resins. For this reason, 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