Document: NUREG-0800
Document ID: 2c1e60ee-a3b4-4f26-8ebd-56dc7a8435b6
Document Type: srp
Title: THREADED FASTENERS ! ASME CODE CLASS 1, 2, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550058.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.13
CFR Part: 
CFR Title: 

Content:
nd 30 require that SSCs important to safety be designed, fabricated, erected, tested and inspected to quality standards commensurate with the importance of the safety functions to be performed. GDC 14 requires that the RCPB be designed, fabricated, erected, and tested in a manner that provides assurance of an extremely low probability of abnormal leakage, rapidly propagating failure, or gross rupture. The RCPB, provides a barrier to fission products, a confined volume for the inventory of reactor coolant, and flow paths to facilitate core cooling. Threaded fasteners and mechanical joints form an integral part of maintaining pressure boundary integrity and are essential for withstanding normal loading and any transient load created during abnormal or accident conditions. The failure of fasteners in a system could result in loss of fluid in the system and jeopardize safe operation of the plant. Conformance with 3.13-8 March 2007 criteria of the ASME Code, Section III and the regulatory positions of RG 1.65 satisfies, in part, the requirements of GDC 1, 14, and 30 by providing assurance that threaded fasteners will be designed, fabricated, and tested to established and proven standards and, thereby, minimizing the likelihood of failure of the pressure boundary. 2. GDC 4 requires that SSC important to safety shall be designed to accommodate the effects of and to be compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of- coolant accidents. Therefore, mechanical connections using threaded fasteners should be protected against the detrimental effects of certain lubricants/sealants that promote corrosion and its vulnerability to boric acid corrosion. 3. GDC 31 requires that the RCPB be designed with sufficient margin to ensure that when stressed under operating, maintenance, testing, and postulated accident conditions the boundary behaves in a nonbrittle manner and the probability of