ENS 47328
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ENS Event | |
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15:40 Oct 6, 2011 | |
Title | |
Event Description | On 10/06/2011 the control room was notified of an oscillation occurring on the output of Unit 2 High Pressure Coolant Injection (HPCI) pump electronic governor. These oscillations are occurring while the system is in standby and is an early indication of potential governor failure. The governor oscillations were discovered on 10/06/2011 at 1140 EDT by the system engineer while performing system trending analysis via plant computer points.
HPCI was declared inoperable and LCO 3.5.1 was entered at 1140 EDT on 10/06/2011. An investigation is in progress. Unit 1 HPCI and both Unit 1 and Unit 2 RCIC (Reactor Core Isolation Cooling) systems are unaffected as the electronic governor outputs for this equipment is stable and trending as expected. This is being reported as a loss of an entire safety function condition in accordance with 10CFR50.72(b)(3)(V)(D). The licensee notified the NRC Resident Inspector. |
Where | |
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Susquehanna ![]() Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+1.12 h0.0467 days <br />0.00667 weeks <br />0.00153 months <br />) | |
Opened: | Dave Borger 16:47 Oct 6, 2011 |
NRC Officer: | Donald Norwood |
Last Updated: | Oct 6, 2011 |
47328 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (99 %) |
After | Power Operation (99 %) |
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