ENS 44439
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ENS Event | |
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00:04 Jun 29, 2008 | |
Title | 60-Day Optional Report for an Invalid Actuation of Unit 1 Tdafw Pump |
Event Description | This report describes an invalid actuation of the Unit 1 Turbine Driven Auxiliary Feedwater (TDAFW) pump that occurred on June 28, 2008. This report is being made in accordance with 10CFR50.73(a)(1), which states, in part, 'In the case of an invalid actuation reported under 10CFR50.73(a)(2)(iv), other than actuation of the Reactor Protection System (RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER.'
On June 28, 2008, Comanche Peak Nuclear Power Plant Unit 1 was in Mode 1 operating at 100% power. At 1904 CDT, the steam supply valve from Main Steam Line 1-04 to the TDAFW pump opened due to a failed diaphragm. Turbine load was subsequently reduced from 1207MWe to 1150MWe per Operations procedures. The upstream isolation valve for the steam supply to the TDAFW pump was closed and the TDAFW pump was stopped. Unit 1 was returned to full power at 2120 CDT and the failed diaphragm was subsequently replaced. The specific train and system that actuated was the third AFW train on Unit 1. The train actuation was complete and during the TDAFW start the system started and functioned correctly. The licensee has notified the NRC Resident Inspector. |
Where | |
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Comanche Peak Texas (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1384.38 h57.683 days <br />8.24 weeks <br />1.896 months <br />) | |
Opened: | Gary Merka 16:27 Aug 25, 2008 |
NRC Officer: | Howie Crouch |
Last Updated: | Aug 25, 2008 |
44439 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (95 %) |
WEEKMONTHYEARENS 544312019-11-01T00:19:0001 November 2019 00:19:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Unit 2 Turbine Driven Auxiliary Feedwater Pump (Tdafwp) ENS 505622014-09-12T18:42:00012 September 2014 18:42:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 502122014-04-22T13:30:00022 April 2014 13:30:00 10 CFR 50.73(a)(1), Submit an LER Emergency Diesel Generator Invalid Actuation ENS 484632012-10-31T11:15:00031 October 2012 11:15:00 10 CFR 50.73(a)(1), Submit an LER Sequencer Fault Resulting in System Actuations ENS 444392008-06-29T00:04:00029 June 2008 00:04:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Report for an Invalid Actuation of Unit 1 Tdafw Pump ENS 433542007-03-13T01:27:00013 March 2007 01:27:00 10 CFR 50.73(a)(1), Submit an LER Invalid Tubine Driven Auxiliary Feedwater Pump Starts 2019-11-01T00:19:00 | |
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