ENS 40404
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ENS Event | |
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01:21 Dec 22, 2003 | |
Title | Potential Impact to Safe Shutdown Due to Control Complex Ventilation Inoperability |
Event Description | On 12/21/03 at 2021, it was discovered that the temperature control valve for the Division 1 Emergency Closed Cooling system had two blown fuses. This results in the Division 1 Control Complex chiller becoming inoperable. Concurrent with this the Division 2 Control Complex chiller was inoperable for planned maintenance. With this configuration both trains of safety related ventilation have been declared inoperable. This results in a loss of safety function for AC and DC distribution systems. Additionally this results in all Emergency Core Cooling systems being inoperable.
This is reportable under 10 CFR 50.72 (b) (3) (ii) (b) and (b) (3) (v) (a, b & d) for unanalyzed condition and loss of a single train safety system. The licensee notified the NRC Resident Inspector. |
Where | |
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Perry Ohio (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-0.83 h-0.0346 days <br />-0.00494 weeks <br />-0.00114 months <br />) | |
Opened: | Jeff Tufts 00:31 Dec 22, 2003 |
NRC Officer: | Jeff Rotton |
Last Updated: | Dec 22, 2003 |
40404 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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