Document: NUREG-0800
Document ID: 78c093cc-6cc4-4fac-aea2-087f774d42c3
Document Type: srp
Title: CONTROL ROD DRIVE STRUCTURAL MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070414.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.5.1
CFR Part: 
CFR Title: 

Content:
surfaces and the introduction of contaminants that may promote stress corrosion cracking.49 3. Other Materials The reviewer examines the information provided in the applicant's safety analysis report (SAR) on the compatibility of the materials (other than austenitic stainless steels) to be used in contact with the reactor coolant. HeThe reviewer determines that the materials 50 are compatible with the service environment so that unacceptable degradation due to51 corrosion or stress corrosion of the component will not occur during the lifetime of the component. Metallic and nonmetallic materials identified in subsection I.3 of this SRP section are reviewed to assure compatibility and that loss of integrity will not occur during the life of the component. Operating experience has indicated that certain nickel-chromium-iron alloys (e.g. Inconel) are susceptible to cracking due to corrosion. Inconel 690 alloy has improved corrosion resistance in comparison to Inconel alloy 600 previously used in reactor applications. Where nickel-chromium-iron alloys are proposed for use, the reviewer verifies that an acceptable technical basis is either identified (based upon demonstrated satisfactory use in similar applications) or presented by the applicant to support use of the material. Particular review emphasis is placed upon the corrosion resistance and stress corrosion cracking resistance properties of the proposed nickel-chromium-iron alloy(s).52 The reviewer determines that the tempering temperatures of all martensitic stainless steels and the aging temperatures of precipitation-hardening stainless steels have been specified and are in accordance with the acceptance criteria in subsection II.3 of this SRP section. 4. Cleaning and Cleanliness Control The reviewer verifies that onsite cleaning and cleanliness control procedures are satisfactory and in accordance with subsection II.4 of this SRP section. For standard design certification reviews under 10 CFR Part 52, the