officially (the insider is believed to have reached a sector which is beyond the l–the PP layer undetected).
The PPS efficiency indicator is the key quality indicator that characterizes the PPS application for the purpose it is designed for. Still, practically, any system is also characterized by other indicators. Thus, an important factor is the system creation and operation cost. Other properties of the system (reliability, noise resistance and others) are also important.
An assessment of the PPS for each of these properties requires:
∙selection of the quantitative indicator that characterizes the given property;
∙development of the assessment procedure;
∙existence of needed initial data.
∙For example, the quantitative indicator of expenditures is the cost of the necessary PPS equipment and the work to equip the nuclear site with engineered physical protection features. Cost estimate is a fairly simple and traditional technique of calculating cost indicators. The dimension of this indicator (ruble or USD) is also clear.
The reliability of a system of EPPFs, as of any other engineered system, is characterized by indicators of fail-safety (mean operating time to failure and others), maintainability (mean time to repair and others), etc.
Noise resistance is normally characterized by such indicator as mean operating time to false actuation of equipment.
Indicators that describe such “fine” properties of systems as the alarm deployment speed (for mobile equipment), masking capabilities and others can be also used.
Respective techniques exist which enable these indicators to be qualitatively estimated. Also there are respective source databases.
A note should be made that the work to acquire necessary initial data, prepare for calculations and assess immediately the PPS efficiency requires a great deal of routine operations and computations. Furthermore, efficiency is assessed more than once in the conceptual design process as the best (reasonable) decisions are chosen. These and many other factors inevitably lead to the necessity of automation of the PPS efficiency assessment procedure and, consequently, development of dedicated computer programs being recognized. The technological revolution in creation and application of personal computers has made this task both vital and feasible.
There is a range of US dedicated PPS efficiency assessment codes widely known in Russia, including the following: