NPP: Power Grid Mutual Safety Assessment - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 420

Figure 14. The geometrical interpretation of linguistic approximation

of Sayano-Shushenskaya HPP - S 1 , Mayansk
HPP - S 2 , Bratskaya HPP- S 3 , Thermal Power
Plant (TPP) of Bratsk- S 4 .
Fragment of BBN with Criticality matrixes
as the nodes and links represented by physical
influences constructed for Siberian power system
is shown in Figure 15. The total criticalities of
power grid systems before and “nearly to” accident
are shown in Table 7 (Table 8). The sequential
increasing of load from Bratskaya HPP and Ma-
yansk HPP resulted to increasing the criticality
of S 1 , and finally led to destruction of HPU - 2

(S 32 ). Increasing of total criticality of S 1 led to
increasing criticality of S 4 .
The proposed technique may be applied to
safety assessment of the power grid taking into
account its systems influence. The technique is
based on the use of the dynamical criticality
matrices hierarchy. The power grid's capacity to
predict the possible safety change could be im-
proved by implementing of the decision making
system. The technique suggested in the paper is
considered as a part of this system. The power
grid safety assessment is carried out taking into
consideration principles of dynamism, hierarchy,

Figure 15. Fragment of BBN with Criticality matrixes as the nodes and links represented by physical
influences constructed for Siberian power system