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:
ed 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 shutdown earthquake. Regulatory Guide 1.143 provides design guidance relative to seismic group classification specific to the steam generator blowdown system. Meeting the requirements of this criterion provides a level of assurance that the reactor coolant pressure boundary will maintain its integrity after a design basis earthquake.35 10.4.8-5 DRAFT Rev. 3 - April 1996 3. GDC 14 requires that the reactor coolant pressure boundary shall be designed, fabricated, erected, and tested to ensure an extremely low probability of abnormal leakage, rapidly propagating failure, or gross rupture. GDC 14 applies to this section because it addresses the capability of the steam generator blowdown system to maintain secondary water chemistry control that will avoid corrosion-induced failure of the reactor coolant pressure boundary. Meeting the requirements of this criterion for the steam generator blowdown system provides a level of assurance that the probability of leakage from or rapidly propagating failure of the reactor coolant pressure boundary does not increase during the operating life of the plant.36 III. REVIEW PROCEDURES The reviewer selects and emphasizes material from this SRP section as may be appropriate for a particular case. 1. a. CMEBEMCB considers the pressure, temperature, flow rate, secondary coolant 37 chemistry, main condenser water inleakage, and primary-to-secondary leakage to determine whether the SGBS design has included the effects of normal operation and anticipated operational occurrences (e.g., main condenser inleakage or primary-to-secondary leakage). CMEBEMCB determines that the design parameters 38 are reasonable. If the proposed system includes processes which are heat-sensitive (e.g., demineralization or reverse osmosis), CMEBEMCB verifies that the