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The inspectors reviewed a self-revealed GrThe inspectors reviewed a self-revealed Green finding and associated non-cited violation of Arkansas Nuclear One, Unit 1, Technical Specifications 5.4.1.a, for the licensees failure to properly preplan maintenance that can affect the performance of safety-related equipment. Specifically, the licensee failed to properly pre-plan maintenance for the replacement of air supply tubing for turbine bypass valve CV-6687, which resulted in the failure of the air tubing, causing valve CV-6687 to fail open, which led to a manual reactor trip and a subsequent loss of the main condenser.d a subsequent loss of the main condenser.  +
23:59:59, 30 September 2018  +
05000313  +
23:59:59, 30 September 2018  +
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05:29:49, 4 December 2018  +
23:59:59, 30 September 2018  +
Reactor Power Transient Caused by the Turbine Bypass Valve Failing Open  +