Document: NRC Regulatory Guide
Document ID: 2704425a-c58a-45c4-93ab-8761721c3e7a
Document Type: regulatory_guide
Title: Evaluation of Reactor Pressure Vessels with Charpy Upper-Shelf Energy Less Than 50 Ft-Lb
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740038.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.161
CFR Part: 
CFR Title: 

Content:
o) for the Connissionae, USNRC Fchuay 25, 199. ics am~ ava'lable fr"or m eorpying f a fee =fr9= NRC Public Document Room at 2120 L Sret NW., Washington, DC; 1he PDR's maiing address is Mail Stop LL.6, Washgto. DC 20555; telephone (202)634-3273; fax (202)634-3343. R-1 analyses to demonstrate margins equivalent to those in Appendix G to Section MI of the ASME Code 3 years before the upper-shelf energy of any beitline materials falls below 50 ft-lb. Therefore, taking no action is not a viable alternative. 4. COSTS AND BENEFITS OF ALTERNATIVES The cost and benefits of the two alternatives discussed above are presented here. 4.1 Endorse Appendix K to ASME Code Section XI The acceptance criteria proposed in Appendix K to ASME Section XI are identical to those proposed in this regulatory guide. The regulatory guide analysis procedures for Service Levels A and B were taken from Appendix K. However, the guide provides procedures applicable to Service Levels C and D. The regulatory guide provides specific guidance on appropriate material properties and on selection of transients for consideration, whereas Appendix K does not provide these procedures and guidance. Without this guidance, each affected licensee would have to develop appropriate procedures for Service Levels C and D, justify the choice of transients, and develop plant-specific material properties. It is estimated that without the guidance of this regulatory guide, developing plant-specific procedutes and material Upopties and applying them to check and report the analysis results would require an additional 6 staff-months (1040 hours) for each affected licensee. Assuming that half of the affected licensees either belong to owners! groups or could make use ofcoimon data, the total additional burden on the licensees that would be incurred by plant-specific analyses is estimated as 9 plants x 6 staff-months per plant, or 54 staff-months (9360 hours). In addition to the increased burden on the licensees, it is