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|  DOE-HDBK-6004-99
f)
Electromagnetic Loads During Faults - Electromagnetic loads induced during abnormal
operating events such as control failures, power supply failures, bus opens or shorts, or
magnet faults.
g)
Natural Phenomena Loads - Natural phenomena hazard loads should include loads
resulting from earthquakes, winds, and floods. UCRL-15910 provides guideline methods
for establishing load levels and for evaluating the response of structures, systems and
components.
h)
Missile Impact Loads - Missile impact loads should include missiles and pipe whip
resulting from failure of high energy systems, if the safety analysis includes such failures
as a design basis accident.
2. Combined Loads
The system structural design evaluations will be based on predicted responses for concurrent event
load combinations that are compared against the corresponding allowable stresses. In applications
involving the ASME Code for example, the evaluation of load combinations would be performed as
shown in Table II-1.
3. Cyclic Loads
Cooling systems are subject to thermal and pressure cyclic loadings during normal and anticipated
off-normal operation and maintenance. Also, systems and components are subject to vibration
loading from motors, cavitation, water/steam hammer, etc. The ASME/ANSI design codes or
comparable computational methods provide criteria for the evaluation which should use conservative
analysis for the number of cycles and service life including the expected changes in materials
properties with time.
66
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