Document: NUREG-0800
Document ID: e4b3ba58-3c25-4846-b7b0-40b8e2866ecf
Document Type: srp
Title: CONTROL ROD DRIVE STRUCTURAL MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340667.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.5.1
CFR Part: 
CFR Title: 

Content:
wer verifies that onsite cleaning and cleanliness control procedures are satisfactory and in accordance with subsection II.4 of this SRP section. IV. EVALUATION FINDINGS When the reviewer has verified that sufficient and acceptable information has been provided in accordance with the requirements of this SRP section, con- clusions of the following type are prepared, to be included in the staff's safety evaluation report: The staff concludes that the control rod drive mechanism structural materials are acceptable and meet the requirements of General Design Criteria 1, 14, and 26 as well as 10 CFR Part 50, Section 50.55a. This conclusion is based on the applicant having demonstrated that the properties of materials selected for the control rod drive mechanism components exposed to the reactor coolant satisfy Appendix I of Section III of the ASME Code, and Parts A, 8, and C of Section II of the Code, and conform with the staff position that the yield strength of cold-worked austenitic stainless steel should not exceed 90,000 psi. The applicant has met the guidelines of Regula- tory Guide 1.85 by using materials of construction that are approved for use to ASME code cases. In addition, the controls imposed upon the austenitic stainless steel of the mechanisms conform to the recommendations of Regulatory Guide 1.31, "Control of Ferrite Content in Stainless Steel Weld Metal," and Regulatory Guide 1.44, "Control of the Use of Sensitized 4.5.1-5 Rev 2 - July 1981 Stainless Steel." All materials selected for application in the control rod drive mechanism component are or will be in conformance with the applicable code case listed in Regulatory Guide 1.85, "Code I Case Applicability ASME Section III Materials." Fabrication and heat treatment practices performed in accordance with these recom- mendations provide added assurance that stress corrosion cracking will not occur during the design life of the component. The com- patibility of all materials used in the control rod