Document: NRC Regulatory Guide
Document ID: d0bc0d48-8edb-492d-b813-53be9418b4aa
Document Type: regulatory_guide
Title: Maintenance of Water Purity in Boiling Water Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740192.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.56
CFR Part: 
CFR Title: 

Content:
his section is to provide informa tion to applicants and licensees regarding the NRC staff's plans for using this regulatory guide. With the exception of the recommendation of regu latory position 4.a on additional conductivity meters as applied to operating plants, this guide reflects cur rent NRC staff practice. Therefore, except in those cases in which the applicant or licensee proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described herein is being and will con tinue to be used in the evaluation of submittals in connection with operating license or construction permit applications until this guide is revised as a re sult of suggestions from the public or additional staff review. Regulatory position 4.a will be used in the evaluation of the performance of operating plant licensees on a case-by-case basis. 1.56-4 APPENDIX The data presented in this appendix illustrate the water quality levels acceptable to the NRC staff for the BWR reactor vessel and condensate system. Table 1 provides conductivity, pH, and chloride lim its for BWR reactor water during various plant operating conditions, including maximum acceptable levels for short durations and special conditions. The relationships among conductivity, pH, and chloride concentration in water at 77°F (25°C) are presented in Figure 2 of this appendix. (Reference "Chloride Con- trol in BWR Coolants," General Electric Report NEDO-10899, 73NED59, Class 1, June 1973.) This relationship is acceptable in establishing appropriate conductivity/pH limits and alarm setpoints. Table 2 provides conductivity limits for the con densate treatment system to ensure maintenance of reactor water quality limitations. The limits indicated establish action points for the corrective actions re quired to maintain reactor water quality limits. 1.56-5 TABLE 1 ACCEPTABLE REACTOR WATER CHEMISTRY LIMITS PARAMETER Specific Conductance at 777F (25°C) 1. Power