ENS 40885
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ENS Event | |
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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. |
Where | |
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Ft 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 |
40885 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 521882016-08-17T23:26:00017 August 2016 23:26:00
[Table view]Other Unspec Reqmnt Offsite Power Source Below the Operability Limit ENS 458982010-05-04T20:12:0004 May 2010 20:12:00 Other Unspec Reqmnt Discovery of After-The- Fact Emergency Condition - Unusual Event Due to Rcs Lineup ENS 436782007-10-01T18:15:0001 October 2007 18:15:00 Other Unspec Reqmnt Replacing the Emergency Response Facility Computer System ENS 435822007-08-21T02:03:00021 August 2007 02:03:00 Other Unspec Reqmnt Inoperable House Service Transformers ENS 408852004-07-20T23:18:00020 July 2004 23:18:00 Other Unspec Reqmnt 4-Hour Notification Required by Technical Specifications 2016-08-17T23:26:00 | |
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