Document: NUREG-0800
Document ID: 91fee075-c567-438d-bf9f-47be3177b457
Document Type: srp
Title: ENGINEERED SAFETY FEATURES MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070453.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.1.1
CFR Part: 
CFR Title: 

Content:
t. The fluid chemistry, cleaning and insulation evaluations are furnished to MTEB for incorporationed into the 11 final SER. These are further described as follows: 1. Composition and Compatibility of Engineered Safety Features Fluids The composition of the containment and core spray coolants must be controlled to ensure their compatibility with materials in the containment building, including the reactor vessel, reactor internals, piping, and structural and insulating materials. The methods and procedures to control the chemical composition of solutions recirculated within the containment after design basis accidents (DBA) must be selected (a) to maintain the integrity of the reactor coolant pressure boundary, by preventing stress corrosion cracking of safety-related components, (b) to insure that adequate solution mixing of ESF fluids will occur, and (c) to prevent evolution of excessive amounts of hydrogen within the containment in the unlikely event of a design basis accident. The time history of the pH of the fluids, including the source and quantity of all soluble acids and bases in the containment after a design basis accident, is reviewed. 6.1.1-3 DRAFT Rev. 2 - April 1996 Containment and core spray solutions must be stable under long-term storage conditions and during prolonged operation of the sprays. Some of these solutions contain boron for reactivity control and other additives for reacting with gaseous fission products. Long-term storage of these solutions are reviewed under SRP Section 6.5.2 by CMEB as part of its secondary review responsibility. In many instances the ESF coolant solutions are stored in more than one form (such as boric acid solution and a sodium hydroxide solution) and mixed only when the ESF are called upon to operate during an emergency. In some plants, the coolant is stored as a boric acid solution that is neutralized by (dry) sodium phosphates mounted in baskets inside the containment after the ESF sprays are activated.12 The