Environmental Engineering Reference
In-Depth Information
( ,)
ac
max
∫∫
N a c dadc
( , )
=
1.
[5.24]
in
(
ac
)
DD
The results of the calculation of function of
P
c
for the cladding of the
reactor pressure vessel, and
P
a
to the main circulation lines DN850 of the
VVER-1000 reactor according to the input inspection and inspection during
the start-up period can be seen in Fig. 5.40a and 5.40b, respectively.
Function
P
a
for the welds of the base metal of the VVER-440 reactor
(Fig. 5.40) was determined using the results of the input and in-service
inspection of reactors at the Novovoronezh nuclear power plant (NVNPP),
as well as data on defectiveness of the reactor casing at the Kola NPP. The
maximum size of the defect was accepted regardless of the direction.
The functions
P
a
and
P
c
for
N
in
were calculated using the equations
N
in
(
a
) =
Aa
-
n
or
N
in
(
c
) =
Ac
-
n
, respectively.
The dependences in Fig. 5.40 in the semilogarithmic scale are well
approximated by straight lines.This means that the equations for
P
a
,
P
c
can
be accurately described by equations such as
1
1
Paa
(
≥
) = exp [
−g
(
a a
−
)];
a
Q
D
[5.25]
Pcc
(
≥
1
) = exp [
−g
(
c c
1
−
)].
c
c
D
a)
b)
5.41
The probability of detecting in welds and base metal of
the VVER-440 reactor defects with depth ≥
a
on the linear (a) and
logarithmic (b) scale.
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