ENS 44859

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v t e ENS Event
17:00 Feb 17, 2009
Title	Both Emergency Diesel Generators Declared Inoperable After Review of Work Boundary Isolation
Event Description	At 1100 on 2/17/2009 with D5 Diesel Generator (A-Train EDG) out of service for planned maintenance, it was discovered that an isolation had been hung that inadvertently disabled the D5 Fuel Oil Storage Tanks Transfer Pumps. These transfer pumps provide the primary fuel oil supply to D5 EDG Day Tank and the secondary supply to D6 (B Train EDG) Day Tank. With D5 Fuel Oil Storage Tanks Transfer Pumps not functional, their ability to transfer fuel oil to the D6 Diesel Generator (B-Train EDG) Fuel Oil Storage Tanks was disabled. Although D6 had both of its primary fuel oil transfer pumps available with approximately 50,000 gallons of diesel fuel, this left PINGP Unit Two with less than the Tech Spec required 65,000 gallons available to maintain Unit Two EDG operability. Therefore, at 1100 on 2/17/2009 D6 EDG was declared inoperable. Thus, both trains of Unit 2 EDGs were inoperable (safety function was lost) for ~34 hours. 65,000 gallons fuel oil inventory is to ensure the EDGs have enough inventory to mitigate the probable maximum flood which would result in being unable to get new fuel oil on site for ~14 days. There is no flooding predicted per the National Weather Service Advanced Hydrologic Prediction Service. The observed level at Lock & Dam #3 is more than 12 feet below flood stage with river level decreasing the last four days. This isolation had been in place since 0129 on 2/16/2009. At 1145 on 2/17/2009 the 21 and 23 D5 Fuel Oil Transfer Pumps were returned to service and D6 Diesel Generator was declared Operable. This did not affect Unit 1. The licensee informed the NRC Resident Inspector.

ENS 44859 +/-
Where
Prairie Island Minnesota (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+1.47 h0.0613 days <br />0.00875 weeks <br />0.00201 months <br />)
Opened:	Steve Ingalls 18:28 Feb 17, 2009
NRC Officer:	Steve Sandin
Last Updated:	Feb 17, 2009
44859 - NRC Website
v • d • e

v t e Emergency Notification System
Prairie Island with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2021-10-18T00:30:00 [Table view]
[ENS list for Prairie Island]

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