ENS 45412: Difference between revisions

v t e ENS Event
15:58 Oct 5, 2009
Title	Manual Scram and High Pressure Coolant Injection Following a Loss of Feedwater Level Control
Event Description	At 1158 on Monday, October 5, 2009, Nine Mile Point Unit One was manually scrammed from approximately 100% rated power due to failure of the Feedwater Level Control System, in anticipation of a reactor scram. Following the manual scram insertion at 11:58, High Pressure Coolant Injection (HPCI) System automatically initiated on low Reactor Vessel (RPV) level. At 11:59, RPV level was restored above the HPCI System low level actuation setpoint, and the HPCI System initiation signal was reset. At Nine Mile Point Unit One, a HPCI System actuation signal on low RPV level is normally received following a reactor scram, due to level shrink. Unit 1 has commenced cooldown, in preparation for the forced outage to commence repairs. Reactor water level is being controlled in the normal operating band; reactor temperature is 450?F and reactor pressure is approximately 500 psig. 10 CFR 50.72(b)(2)(iv)(B) requires reporting within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> when any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical. 10 CFR 50.72(b)(3)(iv)(A) requires reporting within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when a valid actuation of the High Pressure Coolant Injection System occurs. All control rods fully inserted. All systems functioned as required following the reactor scram. The reactor is currently stable in Mode 3. HPCI has been secured. Makeup water is being provided by the Reactor Feedwater System and decay heat removal is through the bypass valves to the condenser. There was no impact on Unit 2 and the plant is in a normal post-scram electrical lineup. The licensee notified the NRC Resident Inspector.

ENS 45412 +/-
Where
Nine Mile Point New York (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-1.28 h-0.0533 days <br />-0.00762 weeks <br />-0.00175 months <br />)
Opened:	John Driscoll 14:41 Oct 5, 2009
NRC Officer:	Donald Norwood
Last Updated:	Oct 5, 2009
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v • d • e

v t e Emergency Notification System
Nine Mile Point with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-09-23T11:20:00 [Table view]
[ENS list for Nine Mile Point]

@@ Line 16: / Line 16: @@
 | event date = 10/05/2009 11:58 EDT
 | last update date = 10/05/2009
-| title = Manual Scram And High Pressure Coolant Injection Following A Loss Of Feedwater Level Control
+| title = Manual Scram and High Pressure Coolant Injection Following a Loss of Feedwater Level Control
 | event text = At 1158 on Monday, October 5, 2009, Nine Mile Point Unit One was manually scrammed from approximately 100% rated power due to failure of the Feedwater Level Control System, in anticipation of a reactor scram.  Following the manual scram insertion at 11:58, High Pressure Coolant Injection (HPCI) System automatically initiated on low Reactor Vessel (RPV) level.  At 11:59, RPV level was restored above the HPCI System low level actuation setpoint, and the HPCI System initiation signal was reset.  At Nine Mile Point Unit One, a HPCI System actuation signal on low RPV level is normally received following a reactor scram, due to level shrink.
 Unit 1 has commenced cooldown, in preparation for the forced outage to commence repairs.  Reactor water level is being controlled in the normal operating band; reactor temperature is 450?F and reactor pressure is approximately 500 psig.

v t e Unit 1
GE-2
Reactor critical	Critical
Scram	Yes, Manual Scram
Before	Power Operation (100 %)
After	Hot Shutdown (0 %)

ENS 45412: Difference between revisions

Latest revision as of 21:11, 1 March 2018

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ENS 45412: Difference between revisions

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