Testing of Open Secondary Window-Type Current Transformers-Test Plan

The U.S. Nuclear Regulatory Commission (NRC) is issuing for public comment a proposed draft test plan, ``Testing of Open Secondary Window-Type Current Transformers--Test Plan.'' The purpose of this testing is to better understand the following scenario: Will open circuiting of the secondary circuit of a current transformer (CT), which is operating within its rated continuous primary current limits, result in an excessively high voltage in the secondary circuit sufficient to start a fire in the form of explosion or arcing in the circuit's insulation at the location of the CT itself or at some other location in the secondary circuit?