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matt222
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I have Q regarding station blackout, the causes of it complete loss of Onsite and offsite power. However if there is no make up what is happening exactly before core damage by steps
That would largely depend on what event precipitated the SBO.matt222 said:I have Q regarding station blackout, the causes of it complete loss of Onsite and offsite power. However if there is no make up what is happening exactly before core damage by steps
Ref: 10 CFR 50.2 - http://www.nrc.gov/reading-rm/doc-collections/cfr/part050/part050-0002.htmlStation blackout means the complete loss of alternating current (ac) electric power to the essential and nonessential switchgear buses in a nuclear power plant (i.e., loss of offsite electric power system concurrent with turbine trip and unavailability of the onsite emergency ac power system). Station blackout does not include the loss of available ac power to buses fed by station batteries through inverters or by alternate ac sources as defined in this section, nor does it assume a concurrent single failure or design basis accident. At single unit sites, any emergency ac power source(s) in excess of the number required to meet minimum redundancy requirements (i.e., single failure) for safe shutdown (non-DBA) is assumed to be available and may be designated as an alternate power source(s) provided the applicable requirements are met. At multi-unit sites, where the combination of emergency ac power sources exceeds the minimum redundancy requirements for safe shutdown (non-DBA) of all units, the remaining emergency ac power sources may be used as alternate ac power sources provided they meet the applicable requirements. If these criteria are not met, station blackout must be assumed on all the units.
A Station Blackout is an event in which the entire electrical power supply to a nuclear power plant is lost. This results in the loss of power to essential systems and can lead to a loss of cooling capability and potential release of radioactive material.
The most common causes of a Station Blackout include natural disasters such as earthquakes, hurricanes, or severe weather conditions. Other causes can include equipment failures, human error, or cybersecurity attacks.
The potential effects of a Station Blackout can include a loss of control of the nuclear reactor, a release of radioactive material into the environment, and damage to equipment and infrastructure. It can also lead to long-term power outages and disruption of essential services.
Nuclear power plants have various safety systems in place to prevent a Station Blackout, such as backup power sources, redundant cooling systems, and emergency procedures. Regular maintenance and training also help to prevent equipment failures and human error.
In the event of a Station Blackout, emergency protocols include activating backup power sources, implementing cooling measures, and monitoring for any potential release of radioactive material. Communication and coordination with local authorities and the public are also crucial in these situations.