Pilgrim Nuclear Plant Vital Power Supply Problems.

Hmm, why did the NRC mention this. More leaking Safety Relief Valves.

The first was the need to use safety relief valves to control the pressure...  

You get it, these guys are having a tough time staying up at power because of unreliable equipment?
Basically the power to the"annunciators and to the feedwater flow control and monitors are vital electrical power load. Sounds like these are related...

We don't have a write up yet on what caused the annunciators power problems...

UPDATED: Pilgrim nuclear reactor shut down

Problem appears to be with electrical system monitoring pumps that feed water to reactor

By Frank Mand 

Wicked Local Plymouth

Posted Aug 22, 2013 @ 04:01 PM

Initial troubleshooting indicated that there was no problem with the flow of water but, rather, a problem with the electrical power for the system that monitors the flow. The reactor operators followed plant procedure and took the plant offline, while back-up pumps automatically activated to maintain the water level in the reactor.

“We are continuing to gather details,” the NRC release stated, noting that the information-gathering process includes having the plant’s two resident inspectors report to the control room to independently verify that the shutdown was proceeding safely. The plant’s senior resident inspector is working with plant staff to diagnose the problem.

Early warning alarm shuts down at nuclear plant

clegere@capecodonline.com

July 16, 2013

Panels of alarms designed to quickly warn personnel of operational failures at the Pilgrim Nuclear Power Station mysteriously shut down at 12:30 a.m. Monday and just as mysteriously restarted at 2:05 a.m.

The system failure required Entergy, the Louisiana-based owner and operator of the Pilgrim plant, to report "an unusual event" to the Nuclear Regulatory Commission.

NRC experts are now trying to determine the cause of the failure. Meanwhile the plant is operating at full power, prompting an outcry from area nuclear watchdogs who say the operation should be shut down until the mystery of the alarm system failure is solved.

Mary Lampert, a Duxbury resident and director of Pilgrim Watch, said her anti-nuclear organization plans to send a statement to the Nuclear Regulatory Commission today.

"Until they go over it with a fine-tooth comb and until they can say 100 percent that it's fixed, they have no business staying operational," Lampert said.

The alarms, called "annunciators," are the first warning but not the only warning of a malfunction, said NRC spokesman Neil Sheehan. "They are there to call prompt attention to an issue, but plants also have gauges and other means for personnel to monitor, plus they have operators out in the field," he said.