Document: 10 CFR Part 50
Document ID: ebc72932-4988-4c38-b485-e106d10d737c
Document Type: cfr
Title: Alternate fracture toughness requirements for protection against pressurized thermal shock events.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.61a
Revision Date: 
Chapter: 
Section ID: 50.61a
CFR Part: 50
CFR Title: 10

Content:
§ 50.61a Alternate fracture toughness requirements for protection against pressurized thermal shock events. ( a ) Definitions. Terms in this section have the same meaning as those presented in 10 CFR 50.61(a) , with the exception of the term “ASME Code.” ( 1 ) ASME Code means the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section III, Division I, “Rules for the Construction of Nuclear Power Plant Components,” and Section XI, Division I, “Rules for Inservice Inspection of Nuclear Power Plant Components,” edition and addenda and any limitations and modifications thereof as specified in § 50.55a . ( 2 ) RT MAX-AW means the material property which characterizes the reactor vessel's resistance to fracture initiating from flaws found along axial weld fusion lines. RT MAX-AW is determined under the provisions of paragraph (f) of this section and has units of °F. ( 3 ) RT MAX-PL means the material property which characterizes the reactor vessel's resistance to fracture initiating from flaws found in plates in regions that are not associated with welds found in plates. RT MAX-PL is determined under the provisions of paragraph (f) of this section and has units of °F. ( 4 ) RT MAX-FO means the material property which characterizes the reactor vessel's resistance to fracture initiating from flaws in forgings that are not associated with welds found in forgings. RT MAX-FO is determined under the provisions of paragraph (f) of this section and has units of °F. ( 5 ) RT MAX-CW means the material property which characterizes the reactor vessel's resistance to fracture initiating from flaws found along the circumferential weld fusion lines. RT MAX-CW is determined under the provisions of paragraph (f) of this section and has units of °F. ( 6 ) RT MAX-X means any or all of the material properties RT MAX-AW , RT MAX-PL , RT MAX-FO , RT MAX-CW , or sum of RT MAX-AW and RT MAX-PL , for a particular reactor vessel. ( 7 ) φt means fast