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:
Revision 1 * July 1978 U.S. NUCLEAR REGULATORY COMMISSION REGULATORY GUIDE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.56 MAINTENANCE OF WATER PURITY IN BOILING WATER REACTORS A. INTRODUCTION General Design Criteria 14, "Reactor Coolant Pressure Boundary," and 31, "Fracture Prevention of Reactor Coolant Pressure Boundary," of Appen dix A, "General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50, "Domestic Licensing of Production and Utilization Facilities," require assur ance that the reactor coolant pressure boundary will have minimal probability of gross rupture or rapidly propagating failure. General Design Criterion 15, "Reactor Coolant System Design," requires that the reactor coolant system and associated auxiliary, control, and protec tion 'systems be designed with sufficient margin to ensure that the design conditions of the reactor cool ant pressure boundary are not exceeded during any condition of normal operation, including antici operational occurrences. Failure of the reactor 0 ant pressure boundary may be postulated whe the mechanisms of general corrosion and str rrr cracking induced by impurities in the rmctor c lan are present. Furthermore, General Design Criterion-, "In strumentation and Control requires that instrumen tation be provided to variables and systems that can affect the reac pressure boundary over their antici ra fo normal operation, for anticipated rat I urrences, and for acci dent condilpn s ap priate to ensure adequate safety.• Y This g describes a method acceptable to the NRC staff f .mplementing the criteria with regard to minimizing the probability of corrosion-induced failure of the reactor coolant pressure boundary in * The substantial number of changes in this revision has made it impractical to indicate the changes with lines in the margin. boiling water reactors (BWRs) by maintaining ac ceptable purity levels in the reactor coolant. It further describes instrumentation acceptablejthe NRC staff for