ENS 52072

v t e ENS Event
16:10 Jul 7, 2016
Title	Accident Mitigation - Main Steam Safety Valves Not Adequately Protected from Tornado Missiles
Event Description	During an evaluation of protection for Technical Specification (TS) equipment from the damaging effects of tornados, Harris Nuclear Plant personnel identified conditions in the plant design such that specific TS equipment is considered not adequately protected from tornado missiles. A tornado could generate multiple missiles capable of striking exhaust piping on multiple main steam safety valves (MSSVs), resulting in crimping of the piping that could impact flow capacity and render the MSSVs inoperable. If the tornado caused a loss of offsite power, the MSSVs are credited to remove decay heat to achieve cold shutdown. Compensatory measures have been implemented to ensure safety in the event of a tornado. Enforcement discretion per Enforcement Guidance Memorandum EGM 15-002 and Interim Staff Guidance DSS-ISG-2016-01 has been implemented and required actions taken. Corrective actions will be documented in a follow-on licensee event report. The licensee has notified the NRC Resident Inspector.

ENS 52072 +/-
Where
Harris North Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-1.52 h-0.0633 days <br />-0.00905 weeks <br />-0.00208 months <br />)
Opened:	Chuck Yarley 14:39 Jul 7, 2016
NRC Officer:	Bethany Cecere
Last Updated:	Jul 7, 2016
52072 - NRC Website
v • d • e

v t e Emergency Notification System
Harris with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
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