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:
materials with the specific fluids to which the materials are subjected. The review is performed to assure compliance with the Commission regulations stated in the General Design Criteria and with the positions of applicable Regulatory Guides and Branch Technical Positions, and also with the ASME Boiler and Pressure Vessel Code (hereinafter "the Code"), Section II, parts A, B, and C, Section III, Division 1 and 2, and Section IX. Areas that are reviewed include: mechanical properties of materials (including fracture toughness), use of cold worked stainless steels, control of ferrite content in austenitic stainless steel welds, and control of ferritic steel welding. B. CMEB reviews areas relating to ESF fluid chemistry, component and system cleaning, and thermal insulation used in the containment. The fluid chemistry, cleaning and insulation evaluations are furnished to MTEB for incorporation into the 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 con- tainment building, including the reactor vessel, reactor internals, piping, and structural and insulating materials. The methods and procedures to control the chemical composition of solutions recircu- lated 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 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