ENS 40885

v t e ENS Event
23:18 Jul 20, 2004
Title	4-Hour Notification Required by Technical Specifications
Event Description	At 1818 the predicted post trip voltage on the 161 KV incoming line went into alarm on the PCM MINT program. The alarm was validated using OI-EG-3 and by conversation with the system operator. The predicted voltage was 160.4 KV. AOP-31 Section 1 'grid instability' was entered. Per the AOP, at less that 160.7 KV, the incoming line and T1A3 and T1A4 are considered inoperable. Technical Specification 2.7(2)c was entered. This is a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> LCO and requires a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> notification to the NRC. Both diesel generators are operable. The system operator took actions to raise the 161 KV system voltage. At 1831, the predicted post trip voltage was 160.9 KV and the LCO was exited. The line was inoperable for 13 minutes. At 1834 the voltage was 161.1 KV and AOP-31 was exited. The licensee attributes the dip in line voltage due to heavy demand. The licensee informed the NRC Resident Inspector.

ENS 40885 +/-
Where
Fort Calhoun Nebraska (NRC Region 4)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+-2.7 h-0.113 days <br />-0.0161 weeks <br />-0.0037 months <br />)
Opened:	Randy Hodgson 20:36 Jul 20, 2004
NRC Officer:	Steve Sandin
Last Updated:	Jul 20, 2004
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v • d • e

v t e Emergency Notification System
Fort Calhoun with Other Unspec Reqmnt
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