Attributes of adequate ageing management programmes are defined by the regulation; see for example the NUREG-1801 (US NRC, 2010) adapted by several VVER operating countries. An adequate AMP has to have the following elements:
1 Definition of SSCs that are subject to ageing management
2 Actions to prevent or mitigate specific ageing processes
3 Surveillance, monitoring and testing of all parameters related to the degradation of the function or serviceability of the SSCs
4 Investigation of ageing factors that may cause degradation or loss of function of SSCs
|
Building or part of the building
|
Structure
|
Aim of the monitoring
|
Measurements
|
Evaluation and criteria
|
|
Main building complex: Reference points all buildings, including reactor and auxiliary buildings, stacks, diesel-building and other structures
|
Building
movements; settlement; contro of stability of cracks caused by movements
|
Fixed geodetical measuring points; I
|
3D evaluation of building movements; correlation with groundwater table; allowable declination of vertical axis of reactor pressure vessel defined by functioning of CRDM
|
|
Reactor building: floor
|
Heavy reinforced
|
Interaction with
|
Investigation of
|
Control of mechanical and chemical
|
|
slabs and walls
|
concrete
|
boric acid media
|
samples; inspection of check-holes
|
properties and comparison with reference values
|
|
Reactor building,
|
Reinforced
|
Control of possible
|
Investigation of
|
Control of mechanical and chemical
|
|
turbine building, intermediate building and galleries: floor slabs and walls
|
concrete
|
leakages and
consequent
leaching
|
samples; inspection of check-holes
|
properties and comparison with reference values
|
|
Reactor building: floor slabs and walls
|
Carbon steel liner
|
Control of
corrosion rate, identification of possible leakages
|
Ultrasonic control of liner wall thickness at the identified places
|
Control of corrosion rate and thickness; focused investigation if the overall leak tightness is less than the reference value for the given unit (comparison with allowable leak rate)
|
|
Reactor building and auxiliary building: floor slabs and walls
|
Decontaminable coating and painting
|
Control of condition of coating and painting
|
Walk-down and visual control according to checklist
|
Expert judgment
|
|
Main building complex: all building parts
|
Hatches, gates, penetrations, fire protection doors;
|
Control of condition of doors
|
Walk-down and visual control according to checklist, fluorescent test
|
Expert judgment
|
|
|
 |
5 Trend analysis to predict degradation processes and to perform corrections in time
6 Acceptance criteria to assure that the functions of the SSCs are maintained
7 Correction measures to prevent or solve problems
8 Feedback process to ensure that preventive actions are effective and appropriate
9 Administrative control of the processes
10 Information retrieval from operational practice to ensure that ageing management is properly carried out.
The same attributes can be applied while reviewing the adequacy of existing plant programmes.
