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| Entered date | Event description | |
|---|---|---|
| ENS 52905 | 15 August 2017 14:07:00 | On August 15, 2017, during evaluation of protection for Technical Specification (TS) equipment from the damaging effects of tornados, Callaway Plant identified a non-conforming condition in the plant design such that specific Technical Specification equipment is considered not to be adequately protected from tornado missiles. The recirculation lines for all three independent trains of Auxiliary Feedwater (AFW) connect to the Condensate Storage Tank (CST) inside the CST Valve House, which is not a tornado missile-resistant structure. The direct impact by a design basis missile could result in crimping of the recirculation lines, thereby creating the potential to cause damage to the Train A and B Motor-Driven Auxiliary Feedwater Pumps (MDAFPs) and the Turbine-Driven Auxiliary Feedwater Pump (TDAFP) by restricting recirculation flow to less than the design requirements. This condition is reportable per 10 CFR 50.72(b)(3)(ii)(B) for any event or condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety, and per 10 CFR 50.72(b)(3)(v) for any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to (A) shut down the reactor and maintain it in a safe shutdown condition, (B) remove residual heat, or (D) mitigate the consequences of an accident. These conditions are being addressed in accordance with NRC's Enforcement Guidance Memorandum EGM 15-002 and Interim Staff Guidance DSS-ISG-2016-01 (enforcement discretion and interim guidance documents). The NRC Resident Inspector has been notified. |