Environmental Engineering Reference
In-Depth Information
Table 8.5 (continued)
Component
Degradation
location
Degradation process/ageing effect
Liner
Fatigue/crack initiation and
propagation
Local corrosion/material loss/crack
initiation and propagation
Coatings
Change of material properties due
to heat and/or irradiation
Service shafts
Carbon steel
cladding of spent
fuel and refuelling
pool and shaft
number 1
Local corrosion/material loss/crack
initiation and propagation
Boric acid corrosion/material loss
Syphon of refuelling
pool
Local corrosion/material loss/crack
initiation and propagation
Boric acid corrosion/material loss
Stainless steel
cladding of shafts
Local corrosion/material loss
Wear, cracking/material loss
Welds and heat
affected zone of
stainless steel
claddings
Local corrosion/material loss/crack
initiation and propagation
Supports and
insertion
elements
Local corrosion/material loss/crack
initiation and propagation
Wear, cracking/material loss
Welds between the
shaft cladding
and connecting
pipelines
Local corrosion/material loss/crack
initiation and propagation
Wear, cracking/material loss
￿ ￿ ￿ ￿ ￿ ￿
Notes: Examples are based on Hungarian regulatory guide No. 1.26.
the organization and policy level activities, and defi nition of the programme
system structure for ensuring the required plant condition, that is the imple-
mentation of the concept described in the introduction of section 8.4.
Several operating VVERs have utility- or even industry-level or umbrella
type ageing management programmes. For example, in Ukraine the plant
level programme has to be deduced from the overall one and the unit level
programme from the plant level one. The overall plant AMP also includes the
categorization of the SCs in accordance with safety relevance, importance
and complexity. In considering the structuring and organization of AMPs, a
graded approach should be applied according to the safety relevance of the
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