15 septembre 2013
Alarme suite à l’inondation du local d’évacuation de chaleur résiduelle du réacteur (RHR). Fermeture d’une vanne pour arrêter la fuite sur une soupape de décharge. Le circuit a été déclaré inutilisable et l’urgence déclarée par l’Autorité de sûreté américaine. Le réacteur est en cours d’arrêt à froid.
Type : BWR Mark 2 - Première divergence : 05 1984 - Puissance thermique : 3952 MWth
Available in english only.
Event Number : 49344 Facility : SUSQUEHANNA - 1 State : PA - Unit : [2] RX Type : [2] GE-4
Event Date : 09/15/2013 - Event Time : 11:23
Emergency Class : UNUSUAL EVENT 10 CFR Section : 50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Initial PWR : 0 % - Current PWR : 0 %
Event Text
UNUSUAL EVENT DECLARED AT SUSQUEHANNA UNIT 2 DUE TO FLOODING IN A RHR PUMP ROOM
"At 1123 EDT, [on 9/15/13], Susquehanna Unit 2 received a Division 2 RHR [Residual Heat Removal] room Flooded alarm. Plant operators reported 3 inches of water in the room with water coming from the 2B RHR pump suction relief valve. The Suppression Pool Isolation valve was closed to isolate the leaking relief valve from the Suppression Pool. This action stopped Suppression Pool level from lowering. The Leak is isolated at this time. Further water is being added to the room as the system piping is being drained. The cause of the relief valve lifting is unknown at this time and is under investigation. At the time of the event, Division 2 RHR system had been declared inoperable for unrelated equipment issues."
At 1222 EDT, the licensee confirmed that leakage from the 2B RHR pump suction relief valve had stopped. Susquehanna Unit 2 remains stable and there was no impact on Susquehanna Unit 1.
The licensee notified the NRC Resident Inspector, State, and Local authorities.
Notified DHS SWO, FEMA, DHS NICC, and Nuclear SSA (email only).
* * * UPDATE FROM MARTIN LICHTNER TO JOHN SHOEMAKER AT 1641 EDT ON 9/15/13 * * *
"U2 SSES [Susquehanna Steam Electric Station] has exited the Unusual Event for Division 2 RHR room flooded as of 1552 EDT. The leak has been isolated, water removed from the room and Division 1 RHR is operating in shutdown cooling proceeding to Mode 4 (Cold Shutdown)."
"A press release for this event was authorized at 1613 and issued at 1628 [on 9/15/13]."
The licensee has notified the NRC Resident Inspector.
Notified R1DO (Cahill), NRR (Dorman), IRD (Gott), DHS SWO, FEMA, DHS NICC, and Nuclear SSA (email only).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130916en.html
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