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:
n 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 Operation Steaming rates greater than 1% of rated steamflow 2. Startup/Hot Standby and Power Operation Steaming rates less than 1% of rated steamflow 3. Cold Shutdown Reactor is not pressurized [i.e., LIMIT I /mho/cma 2/zmho/cmc MAXIMUM LIMIT 10 Atmho/cmb at or below 212"k (100IC)] 10 jimho/cm Chloride 1. Power Operation Steaming rates greater than 1% of rated steamflow 0.2 ppma 0.5 ppmb 2. Startup/Hot Standby and Power Operation Steaming rates less than 1% of rated steamflow 0.1 ppm 3. Cold Shutdown Reactor is not pressurized [i.e., at or below 212°F (100°C)] 0.5 ppm pH at 777F (25C) 1. Steaming rates greater than 1% of rated steamflow 2. Reactor is not pressurized [i.e., at or below 212°F (100°C)] pH not less than 5.6 nor greater than 8.6d pH not less than 5.3 nor greater than 8.6 a Time above I lzmho/cm at 77°F (25C) and 0.2 ppm chloride not to exceed 72 hours for any single incident, but the total time for all incidents should not exceed 2 weeks per year. When the time limits are exceeded, an orderly shutdown should be initiated within 4 hours. b When the maximum conductivity or chloride concentration limits are exceeded, an orderly shutdown should be initiated immediately, and the reactor should be brought to the cold standby condition as rapidly as cooldown rate permits. C Time above 2.Amho/cm at 77°F (25C) and 0.1 ppm chloride not to exceed 48 hours for any single occurrence. When the time limits are exceeded, the reactor should be brought to the hot shutdown condition until the limits are restored. d The reactor should be shut down if pH is <5.6 or >8.6 for a period of 72 hours. TABLE 2 ACCEPTABLE CONDUCTIVITY LIMIT OF CONDENSATE SYSTEM WATER SPECIFIC CONDUCTANCE AT 77-F (25-C) (jwmho/cm) Location Condensate Inlet to Demineralizer Treated Condensate