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:
pril 1996 4.5.1-6 3. GDC 26 establishes requirements regarding the reactivity control systems redundancy and capability. GDC 26 requires a control rod system, preferably including a positive means for inserting the rods, that is capable of reliably controlling reactivity changes to ensure that specified acceptable fuel design limits are not exceeded. The control rod drive system provides a means for rod positioning including insertion to effect reactivity control. Application of GDC 26 to the control rod drive system materials ensures material selection and fabrication supporting the capability for reliable rod movement to effect reactivity control, thereby preserving fuel and cladding integrity, the primary barriers to the release of fission products. III. REVIEW PROCEDURES The reviewer will select and emphasize material from the procedures described below, as may be appropriate for a particular case. To ascertain that the acceptance criteria given in subsection II of this SRP section are met, the reviewer examines the review areas listed in subsection I of this SRP section for the required information, using the following procedures: 1. Material Specifications The reviewer compares the properties of the material proposed for the control rod system with Appendix I to Section III, Division 1 of the Code, and Parts A, B, and C of 41 42 Section II of the Code, and/or acceptable material code cases described in Regulatory Guide 1.85. HeThe reviewer verifies that cold-worked austenitic stainless steels used 43 44 in fabrication of the reactivity control mechanisms are in conformance with subsection II.1, above. 2. Austenitic Stainless Steel Components Review procedures are similar toinclude those described in SRP Section 5.2.3, subsections III.4.a, b, d, and e. The methods of controlling sensitized stainless steel are 45 examined by the reviewer and compared with the positions given in Regulatory Guide 1.44, especially with respect to cleaning and protection from