Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor

Table 4.[11] Risk criteria according to tolerability<br />
Risk class Interpretation<br />
IR Intolerable risk<br />
UR<br />
Undesirable risk, acceptable only if risk reduction is impracticable<br />
or if of the costs of improvement are high<br />
TR<br />
Tolerable risk if the costs of risk reduction higher than the profit<br />
NR Negligible risk<br />
Tolerable risk is represented by green<br />
in Tables 5 and 6, while yellow represents<br />
the ALARP region. Red represents the<br />
region of intolerable risk and reengineering<br />
as the next step in the treatment<br />
of risks classified in this category.<br />
Table 5. Table 6.<br />
Region marked yellow is the region of risk<br />
management, as the main task of entire<br />
process. Risks marked green are in the<br />
region of tolerable risk. However, in our<br />
case, they can be further analyzed, depending<br />
on their frequency.<br />
Degree of severity Degree of severity<br />
Degree of<br />
IV III II I Degree of<br />
probabil-<br />
IV III II I<br />
probability<br />
ity Negligible Marginal Critical Catastrophic<br />
Negligible Marginal Critical Catastrophic<br />
A-very<br />
unlikely<br />
UR IR IR IR<br />
A-very<br />
unlikely<br />
I-A<br />
B-unlikely TR UR IR IR B-unlikely I-B<br />
C-seldom TR TR UR IR C-seldom 2xI-C<br />
Doccasional<br />
NR TR TR UR<br />
Doccasional<br />
2xIII-D<br />
E-likely NR NR TR TR E-likely IV-E II-E<br />
F-frequent NR NR NR TR F-frequent III-F<br />
8. SYSTEMATIC AND OPERATIVE<br />
MEASURES OF REDUCTION,<br />
TRANSFER AND MITIGATION<br />
OF RISK<br />
After the phase of identification and<br />
assessment of risk, its reduction is approached<br />
as a phase with almost unlimited<br />
range of possibilities. The optimum approach<br />
can usually be selected during the<br />
problem analysis phase itself, but compromise<br />
is often required due to economic,<br />
technical and time requirements of its implementation.<br />
In general, the simplest<br />
method is selected which reduces risk to<br />
an acceptable level.<br />
Reduction of risk aims to correct the<br />
influence of individual risks to acceptable<br />
or as low as possible measure. Reliability<br />
of risk analysis is an important precondition<br />
of proper risk identification and<br />
evaluation. If high reliability of risk assessment<br />
was not reached, it is necessary<br />
to undertake the additional monitoring and<br />
wide range of occupational safety measures.<br />
A level of residual risk is determined<br />
based on a series of criteria. Strictly set<br />
limits, i.e. low level of risk tolerability,<br />
can bring into question the costeffectiveness<br />
of production process.<br />
Proper determination of tolerable risks<br />
No 4, 2011. 128<br />
MINING ENGINEERING