Optimisation of non-destructive testing - Probabilistic Safety Assessment for Optimum Nuclear Power Plant Life Management (PLiM) - page 244

Table 7.3 Requirements on in-service inspection of the pressuriser

Strength
criterion

Inspection parameter Permissible value of parameter Inspection frequency

Nominal
-
According to
actual state
142 mm

Nominal
-
According to
actual state
160 mm

1. Pressure
2. Temperature
3. Tensile strength
4. Wall thickness

Continuous
-
> 30 years
> 30 years

Ductile
fracture
resistance

Nominal >100 o
in HT
According to
actual state
142 mm
8 mm
160

Nominal >170 o
in HT
According to
actual state
160 mm
14 mm
160

in HT conditions
In HT conditions
> 30 years

in HT conditions
In HT conditions
> 30 years

1. Pressure
2. Temperature
3. Tensile strength
4. Wall thickness
5. Crack length L
6. Number of cycles N

Quasi-
brittle
fracture
resistance

> 30 years
1 in 4 years
Continuous

> 30 years
1 in 4 years
Continuous

Brittle
fracture
resistance

1. Pressure
2. Temperature

Nominal Nominal During heating During heating

726
726

726
726

1. Number of start-shutdown cycles
2. Number of hydraulic pressing cycles
3. Number of hydraulic tests

Fatigue
strength

Continuous Continuous

88 88