Brown discovered and disclosed to the Nuclear Regulatory Commission (NRC) that the fire testing used to qualify Thermo-Lag was inadequate. By the time of the disclosure, many nuclear plants had already installed the faulty product. The NRC confirmed in fire testing that the installed configurations did not provide the mandated minimum level of protection; the NRC communicated this to its licensees who were subsequently required to either replace or overlay the product with one that met standards. The NRC also established a new and more stringent test procedure for qualifying circuit integrity products.