Document: NUREG-0800
Document ID: 38291c4d-6d61-4922-8b44-6af61374cfaa
Document Type: srp
Title: ENGINEERED SAFETY FEATURES MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340646.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.1.1
CFR Part: 
CFR Title: 

Content:
nt. The time history of tne 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. 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 emer- gency. 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. 6.1.1-2 Rev. 2 - July 1981 The controls on contaminants, such as chlorides, lead, zinc, sulfur, or mercury, in the ESF fluids are reviewed. Nonmetallic thermal insulation, that will be exposed to ESF fluids in DBA environments is evaluated as a potential source of these contaminants. CMEB reviews corrosion rates as related to hydrogen generation upon request of the Containment Systems Branch (CSB). Compatibility of ESF fluids with organic materials (coatings) is reviewed by CMEB as part of its primary review responsibility for SRP Section 6.1.2. 2. Component and Systems Cleaning CMEB reviews the requirements for the cleaning (shop and on-site) of materials and components, cleanliness control, and preoperational system cleaning and the procedures for lay-up of nuclear plant fluid systems. Requirements for the maintenance of system cleanliness of fluid systems and associated components during the operational phase of the nuclear power plant are also reviewed. 3. Thermal Insulation CMEB reviews the composition of the