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:
erformed. 4.5.1-2 Rev 2 - July 1981 b. General Design Criterion 14 as it relates to the reactor coolant pressure boundary being designed, fabricated, erected, and tested so as to have an extremely low probability of abnormal leakage, of rapidly propagating failure, and of gross rupture. c. General Design Criterion 26 as it relates to the control rods being capable of reliably controlling reactivity changes so that specified acceptable fuel design limits are not exceeded. d. Section 50.55a, of Title 10 of the Code of Federal Regulations, Part 50 as it relates to structures, systems, and components shall be designed, fabricated, erected, constructed, tested, and inspected to quality stand- ards commensurate with the importance of the safety function to be performed. Specific acceptance criteria necessary to meet the relevant requirements of GDC 1, 14, and 26 and Section 50.55a of 10 CFR Part 50 are as follows: 1. Materials Specifications The properties of the materials selected for the control rod drive mechanism must be equivalent to those given in Appendix I to Section III of the ASME Boiler and Pressure Vessel Code (hereinafter "the Code"), or Parts A and B of Section II of the Code or are included in Regulatory Guide 1.85, "Code Case Acceptability ASME Section III Materials," except that cold- worked austenitic stainless steels shall have a 0.2% offset yield strength no greater than 90,000 psi, to reduce the probability of stress corrosion cracking occurring in these systems. Regulatory Guide 1.85, "Code Case Acceptability ASME Section III Materials," describes the acceptable code cases that may be used in conjunction with the above specifications. 2. Austentic Stainless Steel Components Acceptance criteria used are similar to SRP Section 5.2.3, subsections II.4.a, b, d, and e. Regulatory Guide 1.44, "Control of the Use of Sensitized Stainless Steel," describes acceptance methods for preventing integranular corrosion of stainless steel components.