Document: NUREG-0800
Document ID: 2779d8da-7e49-4277-9495-bf9ec444636f
Document Type: srp
Title: STEAM GENERATOR BLOWDOWN SYSTEM (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070602.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.8
CFR Part: 
CFR Title: 

Content:
assurance program be established to document compliance with quality requirements. GDC 1 applies to this section because portions of the steam generator blowdown system constitute part of the reactor coolant pressure boundary, which is subject to quality assurance requirements, and because radioactive materials may be present in liquids processed by the steam generator blowdown system. Regulatory Guide 1.26 describes a quality classification system that can be used to determine quality standards. Regulatory Guide 1.143 provides design guidance relative to quality group classification and quality assurance provisions specific to the steam generator blowdown system. The EMCB review of the steam generator blowdown system is coordinated with HQMB reviews performed under SRP Sections 17.1, 17.2, and 17.3, thereby ensuring that components important to safety are covered by the quality assurance program. Meeting the requirements of this criterion provides assurance that failure of any component in the steam generator blowdown system will not result in loss of reactor coolant and subsequent fuel damage. Compliance with GDC 1 further ensures that the reactor coolant pressure boundary will not be degraded by adverse secondary water chemistry conditions.34 2. GDC 2 requires that structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes. This criterion applies to SRP Section 10.4.8 because the review identifies portions of the steam generator blowdown system important to safety and considers the seismic classification of materials used in safety-related and nonsafety-related portions of the system. In addition, the criterion applies because radioactive materials may be present in liquids processed by the steam generator blowdown system. Regulatory Guide 1.29 describes a method to be used for identifying and classifying those features that should be designed to withstand the effects of a safe