Abstract: According to the disclosure, a position of a main control valve and a position of an auxiliary control valve are adjusted. In particular, a position of the auxiliary control valve is adjusted by determining whether a change in the position of the main control valve is in a preset deadband range, thereby preventing a periodic water level fluctuation of a steam generator.

Abstract: Provided is a method of tracing a common cause failure in an integrated drawing. The method includes: synthesizing entities assigned attributes in at least one design drawing in units of a system where a common cause is to be traced; generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing; and displaying a fault propagation path in the integrated drawing by using an internal tracer, wherein the displaying illustrates state information of the entities on the fault propagation path.

Abstract: Provided is an integrated drawing producing method for common cause tracing. The integrated drawing producing method includes: distinguishing shapes of entities in at least one design drawing and assigning an attribute to each of distinguished entities; synthesizing the entities assigned the attributes in the at least one design drawing in units of a system where a common cause is to be traced; and generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing.

Abstract: Provided is a method of tracing a common cause failure in an integrated drawing. The method includes: synthesizing entities assigned attributes in at least one design drawing in units of a system where a common cause is to be traced; generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing; and displaying a fault propagation path in the integrated drawing by using an internal tracer, wherein the displaying illustrates state information of the entities on the fault propagation path.

Abstract: Provided is an integrated drawing producing method for common cause tracing. The integrated drawing producing method includes: distinguishing shapes of entities in at least one design drawing and assigning an attribute to each of distinguished entities; synthesizing the entities assigned the attributes in the at least one design drawing in units of a system where a common cause is to be traced; and generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing.