ENS 52223: Difference between revisions

v t e ENS Event
12:27 Sep 6, 2016
Title	Manual Reactor Scram Due to High Reactor Water Level
Event Description	On Tuesday, September 6, 2016 at 0827 [EDT], with the reactor at 91% core thermal power (CTP), Pilgrim Nuclear Power Station (PNPS) operators initiated a manual reactor scram due to high reactor water level resulting from feedwater level control oscillation. Other than the feedwater level control oscillations, all other plant systems responded as designed. Plant cooldown is in progress using the High Pressure Coolant Injection System in the pressure control mode. The plant is in hot shutdown. The cause of the feed water level control oscillations is under investigation. This event has no impact on the health and safety of the public. Subsequent to the manual reactor scram the plant experienced the following isolation signals: Group 1 Isolation: Main Steam Isolation Valves Group 2 Isolation: Miscellaneous containment isolation valves Group 6 Isolation: Reactor Water Clean-up Reactor Building [Ventilation] Isolation Actuation The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), 'any event that results in actuation of the reactor protection system (RPS) when the reactor is critical...'. This notification is also being made in accordance with 10 CFR 50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section...' (B)(2) 'General containment isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs).' All rods were inserted. The plant is stable with normal off-site power line-up. The licensee will notify the Commonwealth of Massachusetts.

ENS 52223 +/-
Where
Pilgrim Massachusetts (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:+-1.05 h-0.0438 days <br />-0.00625 weeks <br />-0.00144 months <br />)
Opened:	Robert O'Neill 11:24 Sep 6, 2016
NRC Officer:	Bethany Cecere
Last Updated:	Sep 6, 2016
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v • d • e

v t e Emergency Notification System
Pilgrim with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2019-05-18T03:03:00 [Table view]
[ENS list for Pilgrim]

@@ Line 16: / Line 16: @@
 | event date = 09/06/2016 08:27 EDT
 | last update date = 09/06/2016
-| title = Manual Reactor Scram Due To High Reactor Water Level
+| title = Manual Reactor Scram Due to High Reactor Water Level
 | event text = On Tuesday, September 6, 2016 at 0827 [EDT], with the reactor at 91% core thermal power (CTP), Pilgrim Nuclear Power Station (PNPS) operators initiated a manual reactor scram due to high reactor water level resulting from feedwater level control oscillation.  Other than the feedwater level control oscillations, all other plant systems responded as designed.  Plant cooldown is in progress using the High Pressure Coolant Injection System in the pressure control mode.
 The plant is in hot shutdown.  The cause of the feed water level control oscillations is under investigation.  This event has no impact on the health and safety of the public.

v t e Unit 1
GE-3
Reactor critical	Critical
Scram	Yes, Manual Scram
Before	Power Operation (91 %)
After	Hot Shutdown (0 %)

ENS 52223: Difference between revisions

Latest revision as of 21:44, 1 March 2018

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ENS 52223: Difference between revisions

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