ENS 42783

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v t e ENS Event
23:00 Aug 17, 2006
Title	Emergency Diesel Generators Inoperable Due to Undersized Breaker Control Transformers
Event Description	At 1900 hrs on 8/17/06, all four Emergency Diesel Generators (EDGs) were declared INOPERABLE. The inoperability is a result of undersized control transformers for each of the Emergency Diesel Generator Service Water (DGSW) Pumps. The concern is that the DGSW pump contactors will not receive adequate voltage at the starters to ensure the starters pickup under degraded voltage conditions. A 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Limiting Condition for Operability (LCO) was entered per LCO 3.8.1 to restore both EDGs in one division to OPERABLE status. At 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br /> on 8/17/06 the two hour time requirement expired and a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> LCO to place the plant in Mode 3 (Hot Shutdown) was entered. At 0042 hrs on 8/18/06, compensatory measures have been put in place to restore operability to both division 2 EDGs. The compensatory measures include placing the local control switch for both division 2 DGSW Pumps in run. Placing the local control switches in run ensures sufficient voltage will be available at the starters to ensure the starters pickup following a loss of offsite power, load shed, and restoration of power to the applicable busses. With operability restored to division 2 EDGs, the new expiration time for the LCO has been revised to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> based on discovery of one or both EDGs in one division inoperable concurrent with CTG 11-1 [station blackout Combustion Turbine Generator 11-1] not available. After 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, if operability is not restored to either CTG 11-1 or both division 1 EDGs, the plant will be required to enter Mode 3 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This report is being made pursuant to 10CFR50.72.(b)(3)(v) as an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to (A) Shut down the reactor and maintain it in a safe shutdown condition; (B) Remove Residual Heat; (C) Control the release of radioactive material; or (D) Mitigate the consequences of an accident. The NRC resident inspector has been notified. The licensee stated that the current 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> LCO will expire at 1900 EDT 08/20/06.

ENS 42783 +/-
Where
Fermi Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
LER:	05000341/LER-2006-004
Time - Person (Reporting Time:+2 h0.0833 days <br />0.0119 weeks <br />0.00274 months <br />)
Opened:	Jeff Yeager 01:00 Aug 18, 2006
NRC Officer:	Mike Ripley
Last Updated:	Aug 18, 2006
42783 - NRC Website
v • d • e

v t e Emergency Notification System
Fermi with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2023-06-13T03:33:00 [Table view]
[ENS list for Fermi]

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