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:
nsile testing and visual examination. 5.2. Tensile tests should be made on at least three samples cut from each removed wire or strand, one at each end and one at mid-length. The samples should be the maximum length practical for testing and the gauge length for the measurement of elonga tion should be in accordance with the relevant ASTM specification. The following information should be obtained from each test: 1. Yield strength 2. Ultimate tensile strength 3. Elongation at ultimate tensile strength 6. INSPECTION OF FILLER GREASE A sample of sheathing filler grease from each of the sample tendons should be taken and analyzed ac cording to the following national standards. 1. To determine water content, ASTM D95, "Standard Test Methods for Water in Petro leum Products and Bituminous Materials by Distillation." 4 2. To determine reserve alkalinity, ASTM D974, "Standard Test Methods for Neutrali- zation Number by Color-Indicator Titra tion. "4'4 3. To determine the concentrations of water soluble chlorides, ASTM D512, "Standard Test Methods for Chloride Ion in Water." 4 4. To determine nitrates, ASTM D3867, "Stan dard Test Methods for Nitrite-Nitrate in Water" 4 (formerly ASTM D992). 5. To determine sulfides, APHA 428, "Stan dard Methods for Examination of Water and Waste Water."6 In addition, the amount of sheathing filler grease removed and replaced should be compared to assess grease leakage within the structure. 7. EVALUATION OF INSPECTION RESULTS 7.1. The prestressing force measured for each tendon in the tests described in Regulatory Position 4 should be compared with the limits predicted for the time of that test. Regulatory Guide 1.35.1 provides further information on the determination of these limits. 7.1.1. If the measured prestressing force of the selected tendon 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