ENS 44439: Difference between revisions

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Latest revision as of 22:13, 1 March 2018

v t e ENS Event
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.

ENS 44439 +/-
Where
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
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v • d • e

v t e Emergency Notification System
Comanche Peak with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2019-11-01T00:19:00 [Table view]
[ENS list for Comanche Peak]

@@ Line 16: / Line 16: @@
 | event date = 06/28/2008 19:04 CDT
 | last update date = 08/25/2008
-| title = 60-Day Optional Report For An Invalid Actuation Of Unit 1 Tdafw Pump
+| title = 60-Day Optional Report for an Invalid Actuation of Unit 1 Tdafw Pump
 | event text = 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.