ENS 45021: Difference between revisions

v t e ENS Event
22:05 Apr 25, 2009
Title	Manual Scram Following Loss of Cooling to Main Transformer
Event Description	Oyster Creek inserted a manual reactor scram due to a loss of cooling to one of its main transformers. All systems responded normally during the reactor scram. The NRC Resident Inspector has been notified. " The manual scram was described as uncomplicated. All control rods fully inserted. No safeties or PORVs lifted during the transient. There were no electrical power issues besides the problem associated with the main transformer cooling. Normal feedwater cooling was maintained to the reactor and decay heat removal is to the main condenser. There were no ESF actions during the transient. The loss of cooling was to one of Oyster Creeks' two main transformers. Power to the transformer cooling system components (oil cooling pumps and cooling fans) was lost when the control power transformer to the cooling system components failed. The licensee manually scrammed because sustained operation at power would not be possible with loss of cooling to the main transformer and operation with one of the main transformers de-energized is also not possible. The licensee will continue to cold shutdown to perform other maintenance activities while shutdown. The NRC Resident Inspector has been notified.

ENS 45021 +/-
Where
Oyster Creek New Jersey (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-1.25 h-0.0521 days <br />-0.00744 weeks <br />-0.00171 months <br />)
Opened:	Herb Tritt 20:50 Apr 25, 2009
NRC Officer:	Bill Huffman
Last Updated:	Apr 25, 2009
45021 - 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 45021\u003C/a\u003E - \u003Ca href=\"/Oyster_Creek\" title=\"Oyster Creek\"\u003EOyster Creek\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EManual Scram Following Loss of Cooling to Main Transformer\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 45021 - Oyster Creek\n","link":"","lat":39.81436111111111,"lon":-74.20560833333333,"icon":""}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Oyster Creek with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2017-07-03T14:15:00 [Table view]
[ENS list for Oyster Creek]

@@ Line 16: / Line 16: @@
 | event date = 04/25/2009 18:05 EDT
 | last update date = 04/25/2009
-| title = Manual Scram Following Loss Of Cooling To Main Transformer
+| title = Manual Scram Following Loss of Cooling to Main Transformer
 | event text = Oyster Creek inserted a manual reactor scram due to a loss of cooling to one of its main transformers.  All systems responded normally during the reactor scram.  The NRC Resident Inspector has been notified. "
 The manual scram was described as uncomplicated.  All control rods fully inserted.  No safeties or PORVs lifted during the transient.  There were no electrical power issues besides the  problem associated with the main transformer cooling.  Normal feedwater cooling was maintained to the reactor and decay heat removal is to the main condenser.  There were no ESF actions during the transient.

Latest revision as of 22:12, 1 March 2018