I enjoy your threads and your deductive and critical reasoning Proto, but on these issues I have to agree with the few voices that are trying to give
you and others here in this thread a bit of understanding of not just basic Nuclear Power Plant design, and the basics of Fission within said
facilities. That encompassing the technical aspects, on the human aspects I am as always in total agreement.
But there are those who are also trying to give some insight on Industrial Power Distribution, Distributive Control System Philosophy, ESD, (Emergency
Shutdown) Systems, and other Automation and Control Systems that do work to reduce the impact and calamity instances of the incident and/or
catastrophe such as being interpreted by most of the people today.
When doing the HAZOP for a new installation, everything known to that point within lessons learned and past the past history of Engineering and Design
are incorporated into these HAZOP, (Hazard and Operability Study), naturally on an a specific Installation. These studies can range from a new Truck
Loading Terminal to a Nuclear Power Plant, and is not restricted to only hazardous installations but any and all Industrial installations that can
cause any type of impact to HSE, (Health, Safety, Environment).
Besides the fact that under our current system of, “Debt Based Currency Economies”, said studies aren’t even looked at until the financial
issues are determined. And just like buying different types and models of cars, an individual or corporation can buy the” Rolls Royce” type of and
installation, or a “Chevy”.
That being said there are certain guidelines and minimal specifications and procedures that EPC, (Engineering Procurement & Construction), companies
have to conform too. These Specifications and Procedures are set as Statutes at the International, National, and Local levels, and are at the most
part uniform. Individual companies also have of course their own set of Specifications & Procedures and generally are more stringent and/or strict
then those set at the Government level strictly due to the fact that HSE Standards & strict adherence to Company and/or Installation Specifications &
Procedures protect profitability in more ways than on the balance books.( That is another thread)
So now let’s get to the problem at hand.
Disclaimer: This is a discussion and at no time will I offer sources and/or references for my statements. Said statements are a matter of conjecture
and really should be researched and/or verified by independent analysis.
Basic Power Distribution
These sorts of systems have two or in this case, three power supply systems for the entire electrical infrastructure in said installation. But all
three of these are supplied from the main power grid which is the very same places your get your electrical power from at home.
Of course the HAZOP identified this dependency on said power grid to be a hazard and that is why they have distributed the main incoming feed to
different local incoming feeds maintaining an ability to be able to service and repair internal infrastructure without taking away the incoming feeds
needed to operate the installation. Also it is double or triple redundant for facility internal equipment failures.
Now we come the much alluded to “Redundant Systems”.
Redundant Systems as referred to by the MSM and others would be in this instance, according to my interpretation, the UPS, (Uninterrupted Power
Supplies). There will generally be two types of these systems used in industry currently.
1. High Voltage Backup Generators (traditionally diesel driven electrical generators)
2. UPS (Uninterrupted Power Supplies)
The HV Backup Generators are generally used to back up the feed electricity to the, (before in the thread mentioned), MCCs, (Motor Control Centers).
MCCs generally provide the power for mid-level voltage, (400/200 VAC in Europe 660/240/110 VAC in US...AC meaning Voltage Alternating Current),
consumers such as Infrastructure Utility pump motors, electrical outlets, flood lighting and applications and/or equipment requiring said sort of
The UPS System on the other hand is used to provide power to the Systems and devices that control the process and/or automation of equipment within
the installation that is producing, finishing, and/or transporting the product through the installation or to delivery terminals and/or warehouses.
These Systems generally require a Voltage of 24VDC, (Voltage Direct Current).
The UPS system takes its incoming electrical feed from one of the 2 or 3 main power suppliers and uses said feed to charge/discharge and hold the
battery packs at full capacity for when a disruption/interruption in the main power supply grid occurs.
Now without getting too technical for the laymen, the UPS Systems power the Controls Systems and the HV Backup Generator Systems power the pumps and
equipment up to 600VAC.
This means when the Tsunami killed the main power supply grid and HV Backup Generator Systems, the External Cooling system died and was not able to
fill the spent rod cooling basins and also were not able to pump in external water supplies for the closed contained cooling system of the reactor.
The statement made by MSM that the redundant systems could run for 24 to 36 hours was true. But as previously stated these Redundant Systems I have
interpreted to mean the UPS Systems that power the Control Systems and nothing more. (Ok technically they power the F&G Systems, Analytical Systems,
and Process Control Servers and such…)
So when Engineers and Technicians come on this thread to offer some insight, please don’t automatically reject it as disinformation agents
edit on 18-3-2011 by rougeskut because: spelling
edit on 18-3-2011 by rougeskut because: spelling
18-3-2011 by rougeskut because: spelling