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The slide displays the most common locations for a Line Leak Probe and a Float <br />Switch used in a turbine sump. Float switches are the most commonly used <br />probes in the industry. For secondarily contained systems, it is not always <br />required that that the monitoring probe be capable of distinguishing <br />between water and fuel; any liquid detected by such a probe would suggest a <br />breach of the primary or secondary wall and would require immediate <br />investigation. Sometimes operational specification requires that <br />discriminating probes be used for these locations in order that off site <br />personnel can better assess alarm events through remote communication <br />with the Site Operating Control Unit (SOC). Therefore float switches are not <br />generally used. The Line Leak Probe will be discussed later. <br />Control ieers, U.S.A. Page <br />