ENS 40791: Difference between revisions

From kanterella

Latest revision as of 21:23, 1 March 2018

v t e ENS Event
11:45 Jun 4, 2004
Title	Manual Reactor Trip Due to Intake Structure Seaweed Fouling
Event Description	San Onofre Nuclear Generating Station (SONGS) experienced a large influx of seaweed that required securing one of the four running Circulating Water (CW) pumps. When conditions continued to degrade, the Operations Department decided to manually trip the unit. During the trip, all control rods inserted into the core. No manual or power-operated relief valves lifted during the transient. Decay heat is being removed via the atmospheric dump valves. There is no known primary-to-secondary leakage. The Operations staff is maintaining the unit at normal operating pressure and temperature. The electrical grid is stable. Currently, only one CW pump is running. Unit 2 is unaffected and is not experiencing a seaweed influx at this time. The licensee has informed the NRC Resident Inspector

ENS 40791 +/-
Where
San Onofre California (NRC Region 4)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-3.4 h-0.142 days <br />-0.0202 weeks <br />-0.00466 months <br />)
Opened:	Lee Boerneke 08:21 Jun 4, 2004
NRC Officer:	Howie Crouch
Last Updated:	Jun 4, 2004
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v • d • e

v t e Emergency Notification System
San Onofre with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2012-02-01T01:30:00 [Table view]
[ENS list for San Onofre]

@@ Line 16: / Line 16: @@
 | event date = 06/04/2004 04:45 PDT
 | last update date = 06/04/2004
-| title = Manual Reactor Trip Due To  Intake Structure Seaweed Fouling
+| title = Manual Reactor Trip Due to  Intake Structure Seaweed Fouling
 | event text = San Onofre Nuclear Generating Station (SONGS) experienced a large influx of seaweed that required securing one of the four running Circulating Water (CW) pumps.  When conditions continued to degrade, the Operations Department decided to manually trip the unit.
 During the trip, all control rods inserted into the core.  No manual or power-operated relief valves lifted during the transient.  Decay heat is being removed via the atmospheric dump valves.  There is no known primary-to-secondary leakage.  The Operations staff is maintaining the unit at normal operating pressure and temperature.  The electrical grid is stable.  Currently, only one CW pump is running.  Unit 2 is unaffected and is not experiencing a seaweed influx at this time.