ENS 45181
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ENS Event | |
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19:15 Jul 2, 2009 | |
Title | Hpcs Inoperable Due to Logic Card Failure |
Event Description | On July 2, 2009, at 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> (CDT), the Main Control Room received an alarm associated with a failure of the Nuclear System Protection System (NSPS) Self Test System (STS). The indicated failure was on a High Pressure Core Spray (HPCS) system logic card. The card was removed and testing of the card, completed at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br />, determined that the failure was on a circuit that would have prevented the automatic initiation capability of HPCS. Since HPCS is an emergency core cooling system and is a single train safety system, this is reportable under 50.72 (b)(3)(v)(D). It is unknown at this time what caused the failure and plans are in progress to repair or replace the card.
The logic card is being sent out for repairs. The HPCS system will remain inoperable until the card is repaired and replaced. There is no estimate at this time as to when the card will be replaced. The licensee will notify the NRC Resident Inspector. |
Where | |
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Clinton Illinois (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:+-0.58 h-0.0242 days <br />-0.00345 weeks <br />-7.94484e-4 months <br />) | |
Opened: | Chris Dunn 18:40 Jul 2, 2009 |
NRC Officer: | Donald Norwood |
Last Updated: | Jul 2, 2009 |
45181 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (97 %) |
After | Power Operation (97 %) |
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