ENS 45290: Difference between revisions

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| event date = 08/24/2009 18:50 CDT
| event date = 08/24/2009 18:50 CDT
| last update date = 08/24/2009
| last update date = 08/24/2009
| title = Condensate Booster Pump Trip Resulting In A Manual Reactor Scram
| title = Condensate Booster Pump Trip Resulting in a Manual Reactor Scram
| event text = On 8/24/09, at 18:50 Unit 3 was manually scrammed due to loss of 2 of the 3 Condensate Booster Pumps due to low pump suction pressure.  The cause for the Condensate Booster Pump low suction pressures is unknown at this time, but is under investigation.  After the reactor was scrammed manually, reactor water level lowered below the automatic scram set point (+2 inches) and below the automatic start for HPCI and RCIC (-45 inches).  All expected Primary and Secondary Containment isolation valves operated as required, isolation groups 2,3,6 and 8 were actuated.  Both reactor recirculation pumps tripped due to the low reactor water level.  HPCI and RCIC actuated as expected to restore reactor water level.  Reactor pressure control was maintained on the turbine bypass valves, and no Main Steam Relief Valves (MSRVs) were opened as a result of the transient.
| event text = On 8/24/09, at 18:50 Unit 3 was manually scrammed due to loss of 2 of the 3 Condensate Booster Pumps due to low pump suction pressure.  The cause for the Condensate Booster Pump low suction pressures is unknown at this time, but is under investigation.  After the reactor was scrammed manually, reactor water level lowered below the automatic scram set point (+2 inches) and below the automatic start for HPCI and RCIC (-45 inches).  All expected Primary and Secondary Containment isolation valves operated as required, isolation groups 2,3,6 and 8 were actuated.  Both reactor recirculation pumps tripped due to the low reactor water level.  HPCI and RCIC actuated as expected to restore reactor water level.  Reactor pressure control was maintained on the turbine bypass valves, and no Main Steam Relief Valves (MSRVs) were opened as a result of the transient.
At this time the unit is stable in mode 3.  Reactor water level is being controlled using one Reactor Feedwater pump, HPCI and RCIC have been returned to standby readiness.  The 3B Reactor Recirculation Pump has been returned to service.  Reactor pressure is being automatically maintained by the main turbine bypass valves.
At this time the unit is stable in mode 3.  Reactor water level is being controlled using one Reactor Feedwater pump, HPCI and RCIC have been returned to standby readiness.  The 3B Reactor Recirculation Pump has been returned to service.  Reactor pressure is being automatically maintained by the main turbine bypass valves.

Latest revision as of 21:11, 1 March 2018

ENS 45290 +/-
Where
Browns Ferry Tennessee Valley Authority icon.png
Alabama (NRC Region 2)
Reporting
10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-0.2 h-0.00833 days <br />-0.00119 weeks <br />-2.7396e-4 months <br />)
Opened: Joe Bennett
23:38 Aug 24, 2009
NRC Officer: Mark Abramovitz
Last Updated: Aug 24, 2009
45290 - NRC Website
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