Regional Basic Professional Training Course in Korea

❙ 771 ❙
12. Surveillance Programmes
reactor outage where the tightness of the reactor coolant pressure boundary may
have been affected; and
A system hydrostatic pressure test at or near the end of each inspection interval, if
required.
The pressure‐retaining components are visually examined to the extent practicable while
the system is under the test pressure and temperature. The test pressure and temperature
are maintained for a sufficient period of time before the examinations to permit leakages
to be identified. Consideration is given to the accessibility of the components to be
visually examined (for example: removal of insulation).
If leakages (other than normal controlled leakages) are detected during the above tests,
their source is located, and the area examined, to the extent necessary, to establish if any
corrective action is required.
The system leakage test is performed at a test pressure that is not less than the specified
system operating pressure corresponding to rated reactor power. The duration of a test
performed at a pressure higher than system design pressure is limited to prevent excessive
stressing of the system and components.
12.3.5. Test methods and techniques
Methods and techniques for the examinations are in accordance with standards
recognized by the competent authority. The examinations are categorized as: visual,
surface, and volumetric. Each term describes a general method permitting a selection of
different techniques or procedures restricted to that method to accommodate varying
degrees of accessibility and radiation levels and the automation of equipment to perform