5 août 2014
Arrêt d’urgence du réacteur au cœur critique à pleine puissance avec enclenchement du système de protection du réacteur. La cause du problème est en cours de recherche.
Type : BWR Mark 2 - Puissance : 3 546 MWth - Première divergence : 03/1984
Available in english only.
Event Number : 50346
Facility : LASALLE
State : IL : Unit : [2] - [2] GE-5
Event Date : 08/05/2014 - Event Time : 17:34 -
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 100 % Current Power : 0 %
Event Text
AUTOMATIC REACTOR SCRAM
"This notification is being provided pursuant with SAF 1.6 10CFR50.72(b)(2)(iv)(B) and SAF 1.7 10CFR50.72(b)(3)(iv)(A).
"At 1734 CDT on August 5, 2014, LaSalle Unit 2 automatically scrammed due to an RPS actuation. The MSIVs isolated on a Group 1 signal, the cause is under investigation. The reactor water cleanup system isolated during the transient. The plant is stable with Reactor Pressure Control being maintained by the Reactor Core Isolation Cooling System and SRVs and level being controlled by the Low Pressure Core Spray System. The plant is planned to remain in hot shutdown pending investigation of the trip."
The Unit 2 electric plant is in a normal shutdown lineup. All control rods inserted fully on the scram. Unit 1 was not affected by the Unit 2 transient.
The licensee notified the NRC Resident Inspector.
* * * UPDATE [...] AT 1650 EDT ON 8/6/2014 * * *
The initial notification to the NRC stated that the reactor water cleanup system had isolated during the transient. The actual status is being corrected to state that the reactor water cleanup pump tripped during the transient.
The licensee has notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140807en.html
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