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There are several characteristics associated with DC control circuits that are unique as compared to AC control circuits. It is because of these unique characteristics that the extrapolation of the AC circuit test results to DC circuits introduces significant uncertainty. Cable failure modes and effects for DC control circuits may differ significantly from the corresponding behaviors in AC circuits. In order to assess behavioral differences and reduce analysis uncertainty, it is necessary to conduct tests using DC circuits.
Previous fire-induced testing has focused on determining the failure characteristics of alternating current circuits, with only a limited amount of data on direct current (DC) circuits. The purpose of the Draft Test Plan entitled “Draft Project Plan for Fire-Induced Failure Modes and Effects Testing of Direct Current Driven Control Circuit Cables,” is to provide a structured plan for conducting a large number of circuit integrity tests to meet the objective of providing data on spurious actuations related to risk-significant DC circuits typically encountered in nuclear power plants.
The NRC is seeking public comment in order to receive feedback from the widest range of interested parties and to ensure that all information relevant to developing this document is available to the NRC staff. This document is issued for comment only and is not intended for interim use. The NRC will review public comments received on the documents, incorporate suggested changes as necessary, and make the final test plan available to the public through ADAMS.
For the Nuclear Regulatory Commission.