ASME N509-2002 pdf free download.NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS.
4.2 Design Parameters
Values of the following design parameters shall be specified when invoicing this Standard and shall be used wherever referenced:
(a) volumetric air flow rate, acfm (m/h);
(1) minimum flow rate;
(2) maximum flow rate;
(3) design flow rate;
(b) design pressures. in, w.g. (Pa);
(1) maximum operating pressure;
(2) leak test pressure;
(3) maximum design pressure;
(4) structural capability pressure (usually determined by component designer);
(C) pressure—time transient (if applicable), in. w.g./sec (Pa/se-c);
(d) maximum and minimum gas temperature, F (“C) and densit lb/ ft3 (kg/rn3);
(e) maximum inlet relative humidity, %;
(f) entrained liquid water, (mass flow rate), lb/mm (kg/mm);
(g) concentrations of specific contaminants in air- stream;
(h) required decontamination factors for each contaniinant;
(i) component radiation integrated life dose (rad) and maximum dose rate (rad/hr);
(j) maximum dirty filter pressure differential, in. w.g. (Pa);
(k) stnictural loadings;
(1) duct and housing maximum permissible leak rate. scfin (ms/hr) and associated operating pressure, in. w.g. (Pa);
(m) environmental design conditions including ternpcrature. pressure, and relative humidity;
(n) expected duration and c’nvironnwntal conditions of storage area;
(o) particle size distribution and quantity of aerosols and contaminants under normal and accident conditions (if known);
(p) safety classification (ESF or non-ESF);
(q) number of adsortwr test cannisters per adsorber bank;
(r) heater capacitc watts, voltage, temperature differential, if applicable.
4.3 Size (Instilled Capacity) of Air-Cleaning Unit
The installed capacity cfm (m’/hr) of the air cleaning unit shall be no greater than the limiting installed capacity of any bank of components contained in the air- cleaning unit through which the airflow must pass. The installed capacity of any bank or stage of components should not exceed the number of components in the bank times the rated capacity of the individual cnrnponents. Test cannisters shall not be included in determining the installed capacity of any hank or stage of adsoii,ers.
4.4 Environmental Design Condition
All parts and components of the air-cleaning unit shall be selected or designed to operate under the environmental conditions (temperature, relative humidit. pressure, radiation, etc.) specified in para. 42 Materials of construction and components shall be selected or treated to limit generation of comi tiNes and contaminants and to resist corrosion and degradation that would result in loss of function when exposed to the specified environmental conditions for the design life of the corn• ponent.
Environmental qualification requirenients are con- tamed in 10 CFR 4i4, IEEE 323 and ASMIE AG-I. Section AA and various specific ASME AG-I Code sections.
4.5 Structural Load Requirements
ESF systems and all of their components shall be shown, either by testing or by a mathematical technique, to remain functional under the structural loading specified in ASME AG-l,Article AA-4000 and various specific ASME AG-I Code sections.
4.6 Air-Cleaning Units and Components That Must Withstand Fan Peak Pressure
The maximum design pressure shall be documented by calculation, including the basis for the condition, and included in procurement specifications for manufacturer’s design.
(a) Pesittve Pvssurr Air-cleaning units and compont-nts including ducts located en the discharge side of fan(s) which can he isolated by closure of a downstream damper, or potentially plugged components. shall be designed to withstand a positive internal pressure equal to or greater than the peak pressure of the fan(s). If provision is made to deenergize fan(s) on high diffen’ntial pressure or low flow, the components shall be designed to withstand the trip point design pressure plus a margin to include the rate of pressure rise between reaching the pressure setpoint and the time for the instrumentation response. or 10%. whichever is greater.