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This publication is no longer valid Please see http://www-ns.iaea.org/standards/ Doc. no. NUCL£Afl powER pUNT GOESGEN-DAENIKEN LTD XKG-Q-PSO11 >age : * )f : 10 A. Qualification of examination personnel PTs and LTs are supervised by examiner of the KKG quality control office. 5. Assumptions for PT and LT 5.1 Fabrication status : Work on components/systems completed ; performance of PT or LT authorized (fabrication quality acceptable). Control drillings for checking the integrity of concealed welds must be open. (e.g. on reinforcement brackets). Components/systems must be adequately supported in order to bear the weight of the test medium. 5.2. Condition of surface The surfaces to be tested must be free of oil, grease, scale or other contaminations. In the case of liquid PT or LT the external surfaces must be dry, unless only the pressure drop is measured. In the case of gas PT and LT the inner surfaces must also be dry. Installations : PT and LT to be carried out examination before the application of paint, casing, rubber coating, insulation, etc. - Inservice inspection : in the case of PT and LT with pressure drop the removal of surface coatings or insulation is not required. 162
This publication is no longer valid Please see http://www-ns.iaea.org/standards/ Doc. no. KKC-Q-PSOll NUCLEAR P0WER p LAN T GOESGEN-DAENIKEN LTD 5 of : 10 5.3. Examination area In the case of PT or LT of systems sections, the examination area can be seen from the system flow diagram. For local PT or LT or for workshop PT, no system flow diagram is necessary. With components/systems having several separate pressure sections, each section must be separately subjected to a PT or LT. 5.1. Sequence of PT or LT When both examinations are to be undertaken together, the sequence of PT and LT is as follows : PT with liquid : 1.) LT (gas) 2.) PT (fluid) With LT the inner surface must be dry. 6. Preparations for PT and LT Performance responsibility in the KKG : Mechanical/operation department System shut-off valves closed (examination area boundaries) Safety valves blocked Internal structures removed if endangered by PT or LT load Components/system closed externally Pressure pump, pressure gage, pressure line connected to feed valve (see precautions) Component/system filled with tect medium In the case of liquid PT or LT, venting at highest point of component or system Outside surfaces of component/system dry. 163
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