Reliability rise of the spacecraft non-sealed instrument module

It is proposed approaches to the reliability rise of the non-sealed instrument module of the spacecraft, based on the improvement of the apparatus protectability from the influence of the outer space factors and also from the factors of the man-caused nature. Here is realized the mathematical statement of the non-sealed instrument module constructive lay out diagram optimization in the part of mutual location of the vents, surfaces, which are critical to contaminant influence and stationary plasma thrusters.