Beaver Vally Nuclear plant had primary and secondary power down at same time. Here is an example of how easily nuclear plants could cause catastrophic failure. The Primary power feeding BEAVER VALLEY reactor failed. Secondary EDG emergency diesel Generators are also down!
This is also what happened at Fukushima.
EN Revision Text: TECHNICAL SPECIFICATION REQUIRED SHUTDOWN – LOSS OF 480 VOLTAGE EMERGENCY BUS “On 8-12-18 at 0158 EDT, Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus.
This resulted in a Loss of Safety Function due to the 2-2 Emergency Diesel Generator [EDG] being Inoperable coincident with the Residual Heat Release Valve (2SVS-HCV104). A Technical Specification shutdown is required per LCO 3.0.3.”
The Licensee also stated they were in an unanalyzed condition due to the EDG and Residual Heat Release Valve being inoperable at the same time. The Licensee is shutting down to Mode 5 (Cold Shutdown).
* * * UPDATE ON 08/16/2018 AT 1424 EDT FROM BLASE BARTKO TO KEN MOTT * * * “On 8-12-18 at 0158 [EDT]
Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. Per operational guidance, this was determined to be a Loss of Safety Function due to the Unit 2 Emergency Diesel Generator (EDG) being INOPERABLE coincident with the Residual Heat Release Valve (2SVS-HCV104) 10 CFR 50.72(b)(3)(v)(B) and (D). This was also reported as an Unanalyzed Condition 10 CFR 50.72(b)(3)(ii)(b).