ENS 49807: Difference between revisions

v t e ENS Event
03:11 Dec 12, 2013
Title	60 Day Report for an Invalid Main Steam Line Actuation
Event Description	The following event description is based on information currently available. If through subsequent reviews of this event additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10 CFR 50.73. This telephone notification is being made pursuant to the reporting requirements of 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of the Palo Verde Nuclear Generating Station Unit 2 'A' train Main Steam and Feedwater Isolation System (MSFIS) logic. On December 11, 2013, at approximately 2011, Mountain Standard Time, Unit 2 was shut down in Mode 4 with Reactor Coolant System (RCS) temperature at approximately 425 degrees Fahrenheit and 1900 pounds per square inch absolute. While starting up the plant following completion of repairs to the 1A reactor coolant pump, an invalid actuation of the 'A' train MSFIS fast close logic occurred due to a random electrical failure in the 'A' train MSFIS logic cabinet. This resulted in the closure of all four Main Steam Isolation Valves and the two 'A' train Economizer Feed Water Isolation Valves. No other engineered safety feature actuations occurred and none were required. The invalid actuation was initiated by a ground fault in a 30-volt direct current power supply in the 'A' train MSFIS Logic cabinet. Repairs were completed on December 12, 2013. This was a complete actuation of 'A' train MSFIS equipment and all the affected equipment responded as designed. RCS temperature and pressure were maintained stable using atmospheric dump valves. Feed water to the steam generators was being provided by Auxiliary Feed Water and was not affected by the event. The NRC Resident Inspector has been notified.

ENS 49807 +/-
Where
Palo Verde Arizona (NRC Region 4)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1381.33 h57.555 days <br />8.222 weeks <br />1.892 months <br />)
Opened:	Sean Dornseif 16:31 Feb 7, 2014
NRC Officer:	John Shoemaker
Last Updated:	Feb 7, 2014
49807 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 49807\u003C/a\u003E - \u003Ca href=\"/Palo_Verde\" title=\"Palo Verde\"\u003EPalo Verde\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E60 Day Report for an Invalid Main Steam Line Actuation\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 49807 - Palo Verde\n","link":"","lat":33.386894444444444,"lon":-112.86263333333333,"icon":"/w/images/9/93/Arizona_Public_Service_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Palo Verde with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2022-04-12T03:45:00 [Table view]
[ENS list for Palo Verde]

@@ Line 16: / Line 16: @@
 | event date = 12/11/2013 20:11 MST
 | last update date = 02/07/2014
-| title = 60 Day Report For An Invalid Main Steam Line Actuation
+| title = 60 Day Report for an Invalid Main Steam Line Actuation
 | event text = The following event description is based on information currently available.  If through subsequent reviews of this event additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10 CFR 50.73.
 This telephone notification is being made pursuant to the reporting requirements of 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of the Palo Verde Nuclear Generating Station Unit 2 'A' train Main Steam and Feedwater Isolation System (MSFIS) logic.

v t e Unit 2
CE
Reactor critical	Not Critical
Scram	No
Before	Hot Shutdown (0 %)
After	Hot Shutdown (0 %)

ENS 49807: Difference between revisions

Latest revision as of 21:51, 1 March 2018

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ENS 49807: Difference between revisions

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