提出了主应力的偏角误差概念及其计算方法，使主应力方向的精度评定更加真实客观。
Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.
在DCS侧，通过组态的方法，在不增加新测点的前提下实现了汽包集中下降管管孔处主应力的在线计算；
In DCS, configuration is used to accomplish the on-line calculation of main stress of the orifice of the drum's central downcomer.
计算表明考虑中间主应力时圆筒形孔的塑性区半径有明显减少。
The calculation shows that the radius and displacement of plastic zone will reduce when the neutral principal stress is considered.
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