Info

Where:

PD = Design pressure and temperature

SL = Sustained loads including dead weight and applied nozzle loads SOT = System operating transients for upset, emergency, and faulted conditions per customer specifications OBE = Operating basis earthquake SSE = Safe shutdown earthquake

Level A = Those loadings that the pump may be subjected to in the performance of its specified function

Level B = Those loadings that the pump must withstand without damage requiring repair Level C = Those loadings that may result in large deformations that necessitate the removal of the pump from service for inspection or repair Level D = Those loadings that result in gross general deformations with some consequent loss of dimensional stability and damage requiring repair, which may require removal of the unit from service

TABLE 2 Stress limits

Service limits Stress limits (maximum normal stress)

Design and Level A sm < 1.0S

sm = General membrane stress; equal to average stress across solid section under consideration; excludes discontinuities and concentrations and is produced only by pressure and other mechanical loads sl = Local membrane stress; same as sm except that sl includes effect of discontinuities sb = Bending stress; equal to linearly varying portion of stress across solid section under consideration; excludes discontinuities and concentrations and is produced only by mechanical loads

S = Allowable stress, given in Tables I-7.0 and I-8.0 of the ASME code; corresponds to highest metal temperature of section during condition under consideration

Source: ASME Boiler and Pressure Vessel Code, Section III, Nuclear Power Plant Components, Division I, Subsection NC, 1992, New York.

The rotor will not grind into the stator.

The fan blades will not damage the winding insulation.

There is no loss of lubricant and no slipped winding or winding temperature detector.

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