5 décembre 2018
Le réacteur était à pleine puissance quand la dégradation de vide au condenseur s’est produite. L’alimentation en eau auxiliaire et les fonctions d’arrêt se seraient effectuées correctement. La chaleur résiduelle du cœur est éliminée par les vannes de décharge à l’atmosphère.
Type : PWR - Puissance : 1 800 MWth - Première divergence : 11 / 1970 -
Available in english only
Event Number : 53779
Facility : POINT BEACH - State : WI
Unit : [1] - RX Type : [1] W-2-LP
Event Date : 12/05/2018 - Event Time : 00:00 [CST]
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 Person (Organization) :
Initial PWR : 100 % Current PWR : 0 %
Event Text MANUAL REACTOR TRIP ON LOSS OF MAIN CONDENSER VACUUM
"At 1539 [CST] December 5, 2018, with Unit 1 at 100 percent power, the reactor was manually tripped due to degrading condenser vacuum. The trip was uncomplicated with all systems responding normally, post-trip. An actuation of the auxiliary feedwater system occurred during the manual trip. The auxiliary feedwater system automatically started as designed when the valid actuation signal was received. Operations stabilized the plant in mode 3 [hot standby]. Decay heat is being removed by atmospheric dump valves.
"Unit 2 is not affected.
"This event is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A)."
The loss of condenser vacuum resulted because one of two circulating water pumps was running and its discharge valve shut. The cause for the valve shutting is under investigation. There is no primary to secondary leakage.
The licensee notified the NRC Resident Inspector
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20181206en.html
La boutique
Informez vous