ENS 42471

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v t e ENS Event
04:16 Apr 5, 2006
Title	Reactor Scram Following Main Turbine Control Valve Fast Closure
Event Description	Two I & C technicians were performing a 24 month calibration on 2S32R017, Megavar & Voltmeter Recorder in accordance with 57CP-CAL-010-2, Esterline Angus Megavar & KV Recorder. This activity was being performed on Work Order 2042825001. At the approximate time the recorder was being removed from service the shift received a RPS trip from a MTCV [Main Turbine Control Valve] Fast Closure. The control valve fast closure scram was caused by a power load imbalance. Both RFP's [Reactor Feed Pumps] tripped on high reactor water level and RCIC and HPCI were used (for 7 and 2 minutes respectively) to control RWL [Reactor Water Level]. Eight SRV's [Safety Relief Valves] opened momentarily on high reactor pressure. The highest reactor pressure indicated was 1120 psig and the lowest RWL indicated was +7 inches. A main condenser vacuum transient due to loss of seals required use of HPCI and RCIC. The licensee characterized the scram as uncomplicated. All systems functioned as required and nothing unusual or not understood besides what caused the initial power load unbalance signal and resulting MTCV fast closure. All rods fully inserted. The unit is currently at normal pressure and water level for Mode 3. MSIVs remained opened and decay heat is being discharged to the main condenser. The scram had no impact on Unit 1. Offsite on onsite electrical conditions remained normal. The licensee was not in any significant LCO at the time of the event. The licensee notified the NRC Resident Inspector.

ENS 42471 +/-
Where
Hatch Georgia (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge
Time - Person (Reporting Time:+-1.9 h-0.0792 days <br />-0.0113 weeks <br />-0.0026 months <br />)
Opened:	Barry Coleman 02:22 Apr 5, 2006
NRC Officer:	Bill Huffman
Last Updated:	Apr 5, 2006
42471 - 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 42471\u003C/a\u003E - \u003Ca href=\"/Hatch\" title=\"Hatch\"\u003EHatch\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EReactor Scram Following Main Turbine Control Valve Fast Closure\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 42471 - Hatch\n","link":"","lat":31.93298888888889,"lon":-82.34381666666667,"icon":"/w/images/1/14/Southern_Nuclear_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Hatch with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge
WEEKMONTHYEAR2024-09-27T07:46:00 [Table view]
[ENS list for Hatch]

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