Document: NRC Regulatory Guide
Document ID: 0b9a3243-ab39-402c-9f4b-215c6e4f79ab
Document Type: regulatory_guide
Title: Inservice Inspection of Ungrouted Tendons in Prestressed Concrete Containments (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740007.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.35
CFR Part: 
CFR Title: 

Content:
ndon in a group lies above the pre scribed lower limit, the liftoff test is considered to be a positive indication of the sample tendon's accept ability. 7.1.2. If the measured prestressing force of a selected tendon in a group lies between 95% of the prescribed lower limit and 90% of the prescribed lower limit, two additional tendons, one on each side of the first tendon, should be checked for their pre stressing forces. If the prestressing forces of each of the second and third tested tendons are above 95% of the prescribed lower limits for the tendons, all three tendons should be restored to the required level of integrity and the tendon group should be considered acceptable. 7.1.3. In Regulatory Position 7.1.2, if the prestressing force of any two adjoining tendons falls below 95% of the prescribed lower limits of the ten dons, additional lift-off testing should be done to de tect the cause and extent of such occurrence. The condition should be considered reportable. 7.1.4. If the measured prestressing force of the selected tendon lies below 90% of the pre scribed lower limit, the defective tendon should be fully investigated and a determination should be made as to the extent and cause of such occurrence. Such an occurrence should be considered a report able condition. 4ASTM Standards can be obtained from the American So ciety of Testing and Materials, 1916 Race Street, Philadel phia, PA 19103. 5Modified by Note 3 of Table CC-2422-1 of the ASME B&PV, Section III, Div. 2, 1982 Winter Addenda. 6APHA Standards can be obtained from the American Pub lic Health Association, 1015 Eighteenth Street NW., Wash ington, DC 20036. 1.35-4 7.1.5. If the average of all measured ten don forces for each group (corrected for average condition) is found to be less than the minimum re quired prestress level (as defined in the plant's Tech nical Specifications) at anchorage location for that group, the condition should be considered report able. 7.1.6. If from consecutive