Patent ID: 7386086
Filing Date: 2008-06-10
Classification: G05B,G21C,G21D,Y02E

Abstract:
1. A nuclear reactor plant protection system printed circuit card comprising: a first logic device having a first input, a first output and a number of basic logic circuits operatively connected between the first input and the first output; a second logic device having a second input, a second output and substantially the same basic logic circuits as the first logic device, operatively connected between the second input and the second output, the second logic device being operatively connected with said first logic device; a test pulse generator operatively connected to the first input and the second input for providing short test pulses for automatically testing said number of basic logic circuits without taking said printed circuit card out of service, the test pulses overriding any other signal at the first input; and a comparator operatively connected to the first output and the second output for comparing a signal at the first output with a signal at the second output and identifying when the signal at the first output does not match the signal at the second output.