ENS 40494
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ENS Event | |
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10:00 Feb 1, 2004 | |
Title | High Pressure Coolent Injection Declared Inoperable But Remains Available. |
Event Description | During the Unit 3 scram on 01/30/04 the response of the feedwater level control system caused the RPV (Reactor Pressure Vessel) level to increase higher than expected. RPV level rose above the HPCI steam line. Calculations showed approximately 60 gallons of water entered the steam line.
This response could adversely affect the HPCI system should the same type of event occur and FWLC (Feedwater Level Control) respond the same way on Unit 2. Based on this information and no reasonable assurance that the same response will not occur, the Unit 2 HPCI system is conservatively being declared inoperable. HPCI remains available. Entering Tech Spec 3.5.1 Required Action F.1 (Isolation Condenser is OPERABLE) and F.2 (Restore HPCI to Operable status within 14 days). A modification is being prepared to change the response of FWLC to preclude this adverse response during a transient. The NRC Resident Inspector will be notified. |
Where | |
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Dresden ![]() 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:+-0.1 h-0.00417 days <br />-5.952381e-4 weeks <br />-1.3698e-4 months <br />) | |
Opened: | Bill Higgins 09:54 Feb 1, 2004 |
NRC Officer: | John Mackinnon |
Last Updated: | Feb 1, 2004 |
40494 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (96 %) |
After | Power Operation (96 %) |
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