With D.C. Cook Unit 1 in Mode 1 and 100 percent power and Unit 2 in Mode 4 during a refueling outage, the following
emergency diesel generators (
EDGs) were declared
inoperable due to a discovered design and manufacturing issue involving some of the diesel fuel pumps/injectors in each of the following
EDGs:
Unit 1 CD (Train A) EDG, Unit 2 AB (Train B) EDG, and Unit 2 CD (Train A) EDG
Due to both Unit 2 EDGs being inoperable, Unit 2 is required to be in Mode 5 by 1300 [EST] on 12/23/16. Unit 1 is required to restore its emergency diesel generator within 14 days (by 2300 [EST] on 1/04/17).
In connection with both trains of Unit 2 EDGs being inoperable, this is being reported as an 8-hour report pursuant to 10CFR50.72(b)(3)(v)(D) as loss of safety function in connection with mitigating the consequences of an accident.
The NRC Resident Inspector has been informed.
Unit 1 maintenance will be prioritized over Unit 2 and Unit 2 will most likely proceed to Mode 5.
- * * RETRACTION AT 1406 EDT ON 5/22/17 FROM RODNEY PICKARD TO JEFF HERRERA * * *
The condition reported in ENS 52456 pursuant to 10 CFR 50.72(b)(3)(v)(D) has been evaluated, and determined not to be a loss of safety function in connection with mitigating the consequences of an accident, and is being retracted.
With D.C. Cook Unit 1 in Mode 1 and 100% power and Unit 2 in Mode 4 during a refueling outage, the following Emergency Diesel Generators (EDGs) were declared inoperable due to a discovered design and manufacturing issue involving some of the diesel fuel pumps/injectors in each of the following EDGs: Unit 1 CD (Train A) EDG, Unit 2 AB (Train B) EDG, and Unit 2 CD (Train A) EDG.
Subsequent endurance testing was performed on selected Delivery Valve Holders (DVH), which were the affected components of the diesel fuel pumps/injectors, to evaluate the expected degradation of the DVHs during the EDG mission. This testing determined that the identified design and manufacturing issue would not have prevented the EDGs from performing their intended safety functions. Therefore, all EDGs were OPERABLE and did not result in a loss of safety function in connection with mitigating the consequences of an accident.
The NRC Resident Inspector was notified of this retraction.
Notified the R3DO (Kunowski).
