SAFETY P R A C TIC E S - gnssn - International Atomic Energy Agency

This publication is no longer validPlease see http://www-ns.iaea.org/standards/(2) Are daily fuel storage and main fuel storage provided for each unit?(3) Is the storage volume in accordance with consumption calculations and anticipatedpostulated initiating events during the replenishment operation?(4) Are there sufficient and reliable devices provided for monitoring the fuel level?(5) Are there devices for monitoring the function of fuel transfer pumps?(6) If suction pumps are employed, have measures been designed to prevent airinlet into fuel suction pipes?(7) Are measures available to exchange fuel filters without interruption of unitoperation?(8) Are all components of the fuel transfer systems provided with an appropriatesource of safety related power?Steam system(1) Is the working pressure range of the steam turbine such that it can reliablyoperate for the full pressure range of the steam generator down to the start ofthe low pressure cooling system in the primary circuit?(2) Is the exhaust of steam to the atmosphere acceptable? If not (particularly in thecase of a BWR), is a condenser foreseen?(3) Is the problem with water condensing in the steam lines at start and duringoperation taken care of?(4) Is there sufficient steam capacity to supply the loads on the system for thedesigned length of time?Cooling system(1) Is the cooling of each unit independent of that of the other units?(2) Have cooling water pipelines been adequately protected against mechanicaldamage due to postulated initiating events?(3) Is the unit cooling medium filtered and purified so that system corrosion anddamage is minimized?(4) Are there sufficient means to monitor unit temperature and the cooling system?3.4.3. Distribution system switching componentsThis section applies to the AC and DC switchgear and motor control switchingcomponents of the electrical distribution system of the EPS.Basis for acceptanceSafety Guide 50-SG-D7, paras 533-535.