In-Service Inspection of Nuclear Power Plants - gnssn - International ...

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This publication is no longer valid Please see http://www-ns.iaea.org/standards/ ATTACHMENT "E * I SWI-3 6 ECLTING EXAMINATION CHECK OFF LIST I Page 1 of 3 1. The ISI Examiner snail have sufficient light to resolve a 1/32' inch black line on *n 18% neutral grey card at a distance no greater than 24 inches with an eye angle not less than 30 degrees from the surface to be examined. 2. For bolting greater than 2" ir. diameter, the ISI Examiner shall visually examine washers on the reactor vessel and nuts and washers on piping, pumps and valves In place or when removed. Bushings and flange surfaces shall be examined when the connection is disassembled. Flange aurfaces shall only be examined foe piping, pumps and valves and shall be limited to a 1" annular surface surrounding each stud. 3. For bolting 2' and less in diameter, the bolts, studs and nuts shall be examined in place or when removed, The bolting associated with CRE housings shall be examined only when disassembled. The belting described in steps 2 and 3 shall be examined for deficiencies as listed on data sheet. If a deficiency exists, check appropriate box. The following conditions shall be considered unacceptable if detected by the Examiner: a) crack-lilte indications that exceed 1/4* in length non-axially or 1" in length axially; a) more than one deformed or sheared thread in the zone of thread engagement of bolts, studs, or nuts; c) localized general corrosion that reduces the bolt or stjd cross-sectional area by more tnan 5%; d) bending, twisting, or deformation of bolts or studs to the extent that assembly or disassembly is impaired; e) missing or loose bolts, studs, nuts, or washers; 152
This publication is no longer valid Please see http://www-ns.iaea.org/standards/ ATTACHMENT "B" I SWI-3 8 BOLTING EXAMINATION CHECK OFF LIST I Page 2 of 3 f) fractured bolts, studs, or nuts; g) degradation of protective coatings on bolting surfaces. A satisfactory examination could include one or more of these phenomena should the ISI Engineer determine that they will not affect the integrity or function of the component. If a detected surface flaw is determined to be acceptable by the ISI Engineer, a supplemental surface or volumetric examination shall be performed. 6. The ISI Examiner shall complete, sign and date a data sheet for each bolting inspection performed. 7. The ISI Engineer, Mechanical Section shall review, sign and date the data sheet for each bolting inspection performed. 8. If the examination determines that a component is unsatisfactory, the ISI Engineer shall take appropriate action to resolve the deficiency. A KUT shall be issued, if required, and recorded on the data sheet. Subsequently, a re-examination shall be performed. 9. The ISI Engineer shall have the Authorized Nuclear Inservice Inspector (ANII) review, sign and date each data sheet. This indicates that the ANII witnessed or otherwise verified this inspection. 153
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