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:
for both injection and recirculation phases to verify that no areas accumulate very high or low pH solutions and that any assumptions regarding pH in the modeling of containment spray fission product removal are valid. b. Boiling Water Reactors (BWRs) The reviewer verifies that the chemistry of the water used for the emergency core cooling systems and the containment spray systems is controlled to the limits given in subsection II.B.1.b. The reviewer further verifies that hydrogen release is controlled in accordance with Regulatory Guide 1.7. The reviewer also compares the assumed corrosion rates of materials in containment with standard corrosion rate data. IV. EVALUATION FINDINGS The staff concludes that the engineered safety features materials specified are acceptable and meet the requirements of GDC 1, 4, 14, 31, 35, and 41 of Appendix A of 10 CFR Part 50; Appendix B of 10 CFR Part 50, and 10 CFR Part 50, §50.55a. This conclusion is based on the following: 6.1. 1- 9 Rev. 2 - July 1981 1. General Design Criteria 1, 14, and 31, and 10 CFR Part 50, §50.55a have been met with respect to assuring an extremely low probability of leakage, of rapidly propagating failure and of gross rupture. This is shown since the materials selected for the engineered safety features satisfy Appendix I of Section III of the ASME Code, and Parts A, B, and C of Section II of the Code, and the staff position that the yield strength of cold-worked stainless steels shall be less than 90,000 psi. Fracture toughness of the ferritic materials meets the requirements of the Code. The controls on the use and fabrication of the austenitic stainless steel of the systems satisfy the requirements of Regdlatory Guide 1.31, "Control of Ferrite Content of Stainless Steel Weld Metal," and Regulatory Guide 1.44, "Control of the Use of Sensitized Stainless Steel." Fabrication and heat treatment practices performed in accordance with these requirements provide added assurance that the probability of