Document: NRC Regulatory Guide
Document ID: 47283fef-08ff-4021-afa3-0c8370080b94
Document Type: regulatory_guide
Title: Inservice Inspection of ASME Code Class 2 and 3 Nuclear Power Plants components
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1335/ML13350A361.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.51
CFR Part: 
CFR Title: 

Content:
flect new infoorntatOn of experience. S. Materitls &nd Plant Protection 10. General 'I, The pressure developed in components during a system performance lest, a component performance test, or a system pressure test should be representative of conditions under which the systems should be leaktight during operation. The lest pressure should be at least 110 percent of the system design pressure. However. the pressure developed during the conduct of a periodic system performance test would be acceptable during inspections conducted in periods between the pressure tests. Certain components. such as open storage tanks including piping to the first shutoff valve, cannot readily be pressure tested. The hydrostatic pressure developed with tanks filled to their design capacity would be an acceptable test pressure for such tanks and connected piping. C. REGULATORY POSITION I. Inservice inspection requirements for ASME Code Class 22 components should comply with the ASME B&PV Code. Section X1 and the Winter 1972 Addenda' for Class 2 components except that subparagraph ISC-261(a) should be changed to read as follows: "Components in systems or portions of systems which recirculate reactor coolant during normal reactor operation, and are designed for pressure and tempcrature in excess of either 275 psig or 200°F shall be examined in accordance with the requirements specified in Table ISC-261 ." 2. Inspection programs for ASME Code Class 32 components should be performed according to the following schedules: a. All of the components should be pressure It tested and inspected at least once during each 10-year inspection interval. b. In addition, all components should be inspected during periods of normal reactor operation or during system performance testing at least once during every one-third of each inspection interval. 3. Inspection requirements for ASME Code Class 3 components should include the following: a. System pressure tests should be performed to the extent necessary to