ENS 56625: Difference between revisions

v t e ENS Event
10:39 May 17, 2023
Title	60-DAY Optional Telephonic Notification for an Invalid Actuation of an Emergency AC Electrical Power System
Event Description	The following information was provided by the licensee email: At 0339 CDT on May 17, 2023, diesel generator 3 (DG3) had an auto-start during a surveillance test of excess flow check valves in containment atmosphere instrument sensing lines. During the surveillance, workers failed to recognize residual pressure in the system from the test. Per procedure, MS-PS-47C (main steam pressure switch) was placed back in service, resulting in initiation logic for both the high pressure core spray (HPCS) system and DG3 auto-start. Because the HPCS system was tagged out of service for maintenance it did not actuate. The auto-start of DG3 was an expected response to the high drywell pressure indication. The signals cleared, and DG3 was shutdown per procedure. As indicated in 10 CFR 50.73(a)(1), in the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv)(A), the licensee may, at its option, provide a telephonic notification to the NRC Operations Center within 60 days of discovery of the event instead of submitting a written licensee event report. This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) for invalid actuations reported under 10 CFR 50.73 (a)(2)(iv)(A). This actuation was invalid since it was caused by programmatic issues in quality of procedural guidance and not the result of actual plant conditions warranting auto-start of DG3. The actuations were not initiated in response to actual plant conditions, this was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation. Therefore, this event has been determined to be an invalid actuation. Diesel generator 3 system responded as designed to the actuation signal. The HPCS system did not actuate since it was tagged out of service. There was no impact on the health and safety of the public or plant personnel. The following information is provided as specified in NUREG-1022: (a) The diesel generator 3 was actuated. (b) The actuation of DG3 was complete. (c) The DG3 train was started and functioned successfully. The NRC Resident Inspector has been notified.

ENS 56625 +/-
Where
Columbia Generating Station Washington (NRC Region 4)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1467.57 h61.149 days <br />8.736 weeks <br />2.01 months <br />)
Opened:	Dan Sharpe 14:13 Jul 17, 2023
NRC Officer:	Adam Koziol
Last Updated:	Jul 17, 2023
56625 - 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 56625\u003C/a\u003E - \u003Ca href=\"/Columbia\" title=\"Columbia\"\u003EColumbia\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E60-DAY Optional Telephonic Notification for an Invalid Actuation of an Emergency AC Electrical Power System\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 56625 - Columbia\n","link":"","lat":46.55068333333333,"lon":-119.488975,"icon":"/w/images/7/7c/Energy_Northwest_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Columbia with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-05-17T10:39:00 [Table view]
[ENS list for Columbia]

@@ Line 28: / Line 28: @@
 (c)	The DG3 train was started and functioned successfully.
 The NRC Resident Inspector has been notified.
-| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230718en.html#en56625
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230719en.html#en56625
 }}{{unit info
 | Unit = 2

v t e Unit 2
GE-5
Reactor critical	Not Critical
Scram	No
Before	Refueling (0 %)
After	Power Operation (100 %)

ENS 56625: Difference between revisions

Latest revision as of 06:30, 19 July 2023

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ENS 56625: Difference between revisions

Latest revision as of 06:30, 19 July 2023

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