ENS 48319

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v t e ENS Event
00:57 Jul 24, 2012
Title	Invalid System Actuations
Event Description	On July 23, 2012, at 2057 hours0.0238 days <br />0.571 hours <br />0.0034 weeks <br />7.826885e-4 months <br />, the Perry Nuclear Power Plant experienced a loss of the normal power supply to the Reactor Protection System (RPS) A electrical bus. The loss of RPS bus A caused an actuation of several Division 1 containment outboard isolation valves. The actuation signal caused full closure of one or more valves in each of the following Division 1 subsystems: Main Steam line drains, Containment Radiation Monitor, Drywell Radiation Monitor, Reactor Water Cleanup, Fuel Pool Cooling and Cleanup, Liquid Radwaste Sumps, Containment Vessel Chilled Water, Containment Vacuum Relief, Condensate Transfer and Storage, Mixed Bed Demineralizer and Distribution, Containment Personnel Airlocks, Service Air, and Instrument Air. Division 2 components and valves were not affected. This event is considered an invalid system actuation reportable under 10 CFR 50.73(a)(2)(iv)(A). The isolation was not initiated in response to actual plant conditions or parameters, and was not a manual initiation. Therefore, this notification is provided via a 60 day optional phone call in accordance with 10 CFR 50.73(a)(1) instead of submitting a written Licensee Event Report. The event meets reporting criteria specified in 10 CFR 50.73(a)(2)(iv)(B)(2) as a general containment isolation valve signal affecting containment isolation valves in more than one system. All affected systems functioned as expected in response to an outboard isolation signal. The valves were reopened in accordance with plant procedures. The failure mechanism that caused the loss of RPS bus A was a degraded voltage regulator. The voltage regulator was replaced and retested with satisfactory results. The NRC Resident Inspector has been notified.

ENS 48319 +/-
Where
Perry Ohio (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1356.02 h56.501 days <br />8.072 weeks <br />1.857 months <br />)
Opened:	Lloyd Zerr 12:58 Sep 18, 2012
NRC Officer:	Dong Park
Last Updated:	Sep 18, 2012
48319 - 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 48319\u003C/a\u003E - \u003Ca href=\"/Perry\" title=\"Perry\"\u003EPerry\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EInvalid System Actuations\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 48319 - Perry\n","link":"","lat":41.79572777777778,"lon":-81.145375,"icon":"/w/images/a/ad/FirstEnergy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Perry with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2021-03-23T04:37:00 [Table view]
[ENS list for Perry]

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