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At 09:28 on 01-12-01, with the Plant opera … At 09:28 on 01-12-01, with the Plant operating at full power, an unplanned actuation of the "A" Reactor Trip Breaker occurred during testing of "A" Solid State Protection System (SSPS). The "A" Reactor Trip Breaker Bypass Breaker had previously been closed as part of the testing procedure; therefore the "A" Trip Breaker actuation had no effect on Plant operation Due to a missed step in the procedure, the INPUT ERROR INHIBIT switch for the "A" train SSPS had not been placed in the INHIBIT position. Placing the switch in the INHIBIT position generates an Intermediate Range Rodstop Block and blocks the source range detector. Immediately prior to this step is a caution statement that has a requirement to notify the Reactor Operator. The Technician read the statement, notified the Reactor Operator as required, and incorrectly initialed the following step as complete, but failed to reposition the switch. When the Technicians cycled the "A" logic switch, the "A" Reactor Trip Breaker opened and the Control Room received annunciator 56B, RCS Supervision, notified Engineering and initiated an immediate review of the events. It was discovered that the INPUT ERROR INHIBIT switch had not been placed in the INHIBIT position. The switch was placed in INHIBIT and the test was completed.ced in INHIBIT and the test was completed. +
At 09:28 on 01-12-01, with the Plant opera … At 09:28 on 01-12-01, with the Plant operating at full power, an unplanned actuation of the "A" Reactor Trip Breaker occurred during testing of "A" Solid State Protection System (SSPS). The "A" Reactor Trip Breaker Bypass Breaker had previously been closed as part of the testing procedure; therefore the "A" Trip Breaker actuation had no effect on Plant operation Due to a missed step in the procedure, the INPUT ERROR INHIBIT switch for the "A" train SSPS had not been placed in the INHIBIT position. Placing the switch in the INHIBIT position generates an Intermediate Range Rodstop Block and blocks the source range detector. Immediately prior to this step is a caution statement that has a requirement to notify the Reactor Operator. The Technician read the statement, notified the Reactor Operator as required, and incorrectly initialed the following step as complete, but failed to reposition the switch. When the Technicians cycled the "A" logic switch, the "A" Reactor Trip Breaker opened and the Control Room received annunciator 56B, RCS Supervision, notified Engineering and initiated an immediate review of the events. It was discovered that the INPUT ERROR INHIBIT switch had not been placed in the INHIBIT position. The switch was placed in INHIBIT and the test was completed.ced in INHIBIT and the test was completed. +
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