3 septembre 2014
Cet évènement, déclaré le 22 juillet 2014, a été retiré car, contrairement à la déclaration précédente, selon la NRC, le système d’injection aurait été rendu disponible dans des délais légaux.
Type : BWR Mark 2 - Puissance : 3 988 MWth - Première divergence : 05/1987
Available in english only.
Event Number : 50296
Facility : NINE MILE POINT - State : NY -
Unit : [2] RX Type : [1] GE-2,[2] GE-5 NRC Notified By : CARL JONES
Event Date : 07/22/2014 - Event Time : 13:43
Last Update Date : 09/02/2014 Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR Current PWR 2 N Y 100 % Power 100 % Power Operation
Event Text
DIESEL GENERATOR FOR HIGH PRESSURE CORE SPRAY DECLARED INOPERABLE DURING SURVEILLANCE TESTING
"This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident. During the conduct of the Unit 2 Division 3 High Pressure Core Spray (HPCS) Diesel Generator (DG) surveillance test, one of 2 Cooling Water Outlet Valves failed to automatically open. The Division 3 Diesel is supplied by two redundant trains of cooling water one from each Service Water Divisional Header. Although the redundant cooling water supply was fully available and supplied adequate cooling to the diesel generator, the DG was at reduced margin to have adequate cooling water supply, if required during a loss of offsite power. Due to this loss of margin and inoperable condition, it has been determined that this failure could potentially affect the safety function of this system, and is being reported as an 8 hour ENS notification."
The licensee has attributed the failure to high resistance in a relay which is currently being replaced. This places Unit 2 in the Technical Specification Action Statement 3.8.1, which requires restoration of Diesel Generator within 72 hours or commence a Reactor Shutdown. All other ECCS Systems have been verified operable.
The licensee informed the NRC Resident Inspector and will inform the State of New York.
* * * RETRACTION AT 1940 EDT ON 9/2/2014 FROM ANTHONY PETRELLI TO MARK ABRAMOVITZ * * *
"This update retracts Event Notification #50296, which reported an event or condition that could have potentially prevented fulfillment of a Safety Function needed to mitigate the consequences of an accident. Upon further review, it was determined that the ability of the HPCS system (single supported train) remained operable and capable of performing its safety function as evaluated by the NMP Unit 2 Safety Function Determination Process (TS 5.5.11).
"The NRC Resident Inspector has been notified."
Notified the R1DO (Ferdas).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140903en.html#en50296
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