ENS 41184
ENS Event | |
|---|---|
07:44 Oct 7, 2004 | |
| Title | Invalid System Actuation |
| Event Description | The purpose of this report is to provide a telephone notification under 10 CFR50.73(a)(2)(iv)(A) for invalid actuation of emergency AC electrical power systems. As allowed by 10 CFR50.73(a)(1), this telephone is being made in lieu of submitting a written LER.
On October 7, 2004, James A. FitzPatrick was in a refueling outage with the reactor cavity flooded and the spent fuel pool gates removed. At approximately 0244, Surveillance testing was in progress on the LOCA initiation logic for the 'A' and 'B' RHR Pumps. Technicians had aligned the initiation circuit for testing in accordance with Surveillance Test ST-2F. When the test signal was applied to the circuit the 'A' and 'B' RHR pumps started as expected. The 'A' and 'C' Emergency Diesel Generators (EDGs) unexpectedly auto started but did not load onto the emergency bus. There was no loss of power to the emergency busses and thus no need for the EDGs to load and power the emergency busses. Operations personnel verified plant conditions and secured the EDGs. Condition Report CR-JAF-2004-04426 was initiated and an investigation into the unexpected start of the EDGs was conducted. It was determined that a relay malfunction in the test circuitry resulted in the failure to 'block' the EDG auto start signal. The EDGs started as designed based on the response to the unblocked test signal in the start logic. Since there was no actual need for the EDGs to start and the start was the result of a test signal that should have been blocked by the failed relay it was determined that the EDG start was based on an invalid signal. This notification is being made pursuant to 10 CFR 50.73(a)(2)(iv) and 10 CFR 50.73(a)(1)." The state of New York will be notified of this event by the licensee. The NRC Senior Resident Inspector was notified of this event by the licensee. |
| Where | |
|---|---|
Fitzpatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+799.02 h33.293 days <br />4.756 weeks <br />1.094 months <br />) | |
| Opened: | Andy Halliday 15:45 Nov 9, 2004 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Nov 9, 2004 |
| 41184 - NRC Website
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WEEKMONTHYEARENS 526452017-01-31T19:25:00031 January 2017 19:25:00
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