Diesel generators, emergency

Class III power. Diesel generated emergency electric power. There are two independent and widely separated sets of Class III diesels Group 1 diesels and Group 2 diesels. The latter are seismically qualified. 

Many redundant safety features were provided at the SRP. These included a moderator dump tank, gadolinium nitrate solution as emergency absorber, continuously mnning diesel generators, and a 95 x 10 -L (25 x 10 -gal) elevated water tank for each reactor, for assurance of cooling. 

It is common practice to provide a standby emergency source of supply at all important installations such as large factories, railways, airports and other essential services. This is usually achieved with the use of a captive diesel generator (DG) set (Figure 16.1). Here we briefly discuss these machines, their characteristics and selection for a required application. We also consider schemes that are commonly used to start a DG set and run it individually or in parallel with an existing source of supply, which may be another DG set or an infinite bus. 

Captive (emergency) power generation covers the application of a diesel generating set, its starting, protection, synchronizing and load sharing. This forms an important part of power distribution at any installation to provide a standby source of supply,... 

Provision for cooling emergency equipment, e.g. diesel generators if cooling water is disrupted. 

Standby Hardware that is normally not running, but must be ready to run (e.g., an emergency diesel generator). 

Emergency Diesel Generator Operating Experience Nuclear 600 occurrences of failure from event reports and questionnaires Diesel generators 95. 

The Reliability of Emergency Diesel Gerterators at U.S. Nuclear Power Plants Nuclear Number of failures and demands lor 154 diesels Failure to start and failure to load and run data for Diesel Generators 106. 

Reliability of Emergency AC Power Systems Nuclear 900 oocurrenoes of diesel generator failures at U.S. nuclear power plants Diesel generator performance data for 18 different nuclear power plants 115. 

A Review of Emergency Diesel Generator Performance at Nuclear Power Plants... 

U.S. Commercial Nuclear Power Plants (Various Components). Reliability of Emergency Diesel Generators at 4.7-14... 

Both scrubbers will be supplied with three sources of electrical power - the main grid supply, a back-up grid supply from a different substation and an emergency diesel generator. In the emergency chlorine scrubber, critical equipment items will be backed-up by automatic start-up of stand-by equipment. A gravity head tank of caustic soda and a nitrogen ejector will also be provided to allow safe neutralisation of chlorine vents in the event of total power failure. 

Emergency diesel generators from each other and from adjacent areas... 

The electric back-up to this process is independent of that of the isolation system, the diesel generator is a different brand and capacity, therefore common cause failure will not be considered (Fullwood, 2000). The activation of the neutralisation process is carried out by the emergency system EAS-200, and leak detectors AI201 and AI202, as shown in Figure 4. 

It can be appreciated, from this analysis, that factors which contribute most to the end state are the main electricity supply (FRP), diesel generators (FGD2 and FGD1), valve V51 to close (V51AC), valve V13 to open and unavailability due to maintenance of the emergency tanks (T02MAN and TOIMAN), as shown in Figure 7. 

Emergency power - electric/diesel generators, inert gas. 

---