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System Testing and Control - doe-std-1128-98_ch10316
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DOE-STD-1128-98
accident conditions. These requirements should include system and
component design characteristics, such as the installation of standby
spare units, provision of emergency power for fans, installation of
tornado dampers, seismic qualification of filter units, and fail-safe valve
positioners.
The ventilation system should be designed to operate effectively and to
permit servicing or filter replacement while operating. The system's
effectiveness should be assessable during operation by means of installed
testing and measurement devices.
Air-cleaning systems should be designed for the convenient, repetitive,
and reliable in-place testing of each stage of the system for which credit
is taken in accordance with ANSI/ASME N510-1989, Testing of Nuclear
Air Cleaning Systems (ANSI, 1989d). Provisions for in-place testing
should include aerosol injection ports, sampling ports, and connecting
and bypass ductwork. Each filter bank should be tested upon installation,
periodically thereafter, and anytime when conditions have developed that
may have damaged the filter, e.g., pressure drop, over-pressure, water
spray, etc. The filter or filter bank should be tested and demonstrate a
particle-removal efficiency as described in ANSI/ASME N510-1989,
Testing of Nuclear Air Treatment Systems (ANSI, 1989d), and ANSI/UL
586-1990, High- Efficiency Particulate Air Filter Units (ANSI, 1990).
The portions of the ventilation system that are essential to preventing
releases of radioactive materials should continue to function (or
automatically change to a safe-failure mode) under abnormal or accident
conditions. The ventilation system fans should produce a maximum
exhaust rate that is greater than the maximum supply rate. Exhaust fans
should be provided with emergency power in the event of loss of normal
electrical power supplies. Exhaust and supply fans should be redundant.
If the system fails, exhaust-control dampers should fail in the open
position and the supply-control dampers should fail in their preset closed
position. Supply fans should automatically cut off when the exhaust-fan
capacity in service is not sufficient to maintain the proper pressure
differential. Alarms should be provided to signal the loss of fan capacity
or improper air balance. System components or devices that must
function under emergency conditions should be able to be tested
periodically, preferably without interruption of operations.
Appropriate surveillance instrumentation and manual system operation
controls should be provided at one common location. In addition,
surveillance instrumentation should be located in an external or protected
area that would be accessible during and after all types of postulated
accidents.
C-26


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