ENS 53235
ENS Event | |
|---|---|
18:10 Mar 1, 2018 | |
| Title | En Revision Imported Date 11/8/2019 |
| Event Description | EN Revision Text: UNANALYZED CONDITION FOR TORNADO GENERATED MISSILES
On March 1, 2018, during evaluation of protection for Technical Specifications (TS) equipment from the damaging effects of tornado generated missiles, Quad Cities Station identified a non-conforming condition in the plant design such that specific TS equipment is considered to not be adequately protected from tornado generated missiles. Tornado generated missiles could strike the Unit l, Unit 1/2, and Unit 2 Emergency Diesel Generator intake and exhaust stacks, day tank vents, and main fuel oil tank vents. This could result in crimping of the intake/exhaust stacks and vents, which would affect the ability of the Emergency Diesel Generators to perform their function if a tornado would occur. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B) as a condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety, and 10 CFR 50.72(b)(3)(v)(D) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. This condition is being addressed in accordance with NRC enforcement guidance provided in Enforcement Guidance Memorandum (EGM) 15-002, 'Enforcement Discretion for Tornado-Generated Missile Protection Noncompliance,' Revision 1, and DSS-ISG-2016-01, 'Clarification of Licensee Actions in Receipt of Enforcement Discretion per Enforcement Guidance Memorandum EGM 15-002, Enforcement Discretion for Tornado-Generated Missile Protection Noncompliance,' Revision 1. Compensatory measures have been implemented in accordance with these documents. The NRC Resident Inspector has been informed of this notification.
The purpose of this notification today (11/07/19) is to retract event notification#53235 made on March 1, 2018, for Quad Cities Station. Additional review determined that the current design of all three Emergency Diesel Generators and associated Day Tanks and Main Fuel Oil Storage Tanks Vents is consistent with the licensing basis for Quad Cities Station. There was no non-conformance of Quad Cities' tornado missile protection design, and the EDGs were operable at the time the event notification was made. Therefore, this event does not meet the criteria of 10 CFR 50.72(b)(3)(ii)(B) and 10 CFR 50.72(b)(3)(v)(D) and ENS#53235 is being retracted. The NRC Resident Inspector has been informed of this notification. Notified R3DO (Peterson). |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-4.45 h-0.185 days <br />-0.0265 weeks <br />-0.0061 months <br />) | |
| Opened: | Philip Fowler 13:43 Mar 1, 2018 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Nov 7, 2019 |
| 53235 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (85 %) |
| After | Power Operation (85 %) |