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Rod cluster control assemblies

Recently, the inspection methodology for controlling the nuclear power plant s RCCA s (Rod Cluster Control Assemblies) has been modified to improve speed and ergonomy. [Pg.1006]

Figure 12. Pressurized water reactor rod-cluster control assembly. (After Ref. 11.)... Figure 12. Pressurized water reactor rod-cluster control assembly. (After Ref. 11.)...
ABCDEFGHJ KLMMPRST 241 FUEL ASSEMBLIES 89 ROD CLUSTER CONTROL ASSEMBLIES 12SPND FINGERS... [Pg.173]

Diverse reactivity control stem X 37 rod cluster control assemblies... [Pg.118]

Regular inspections of rod cluster control assemblies (RCCAs) are performed during refueling periods by visual examination, eddy current testing and diameter profilometry. Generally, all RCCAs will be inspected within four years period. [Pg.34]

Rod cluster control assembly (RCCA) insertion characteristics. [Pg.120]

Uncontrolled rod cluster control assembly (RCCA) bank withdrawal from a subcritical or low-power startup condition. This is fault 4.6.1 in the fault schedule. [Pg.134]

The reactor system (the reactor vessel and integrated head package, reactor internals, fuel assemblies, rod cluster control assemblies, control rod drive mechanisms and in-core instrumentation). [Pg.169]

Rod cluster control assemblies (53-off) and grey rod cluster assemblies (16-off). [Pg.172]

A single rod cluster control assembly occupying all 24 guide thimble tubes within a fuel... [Pg.178]

Rod Cluster Control Assemblies and Grey Rod Cluster Assemblies... [Pg.180]

Each rod cluster control assembly consists of 24 absorber rods fastened at the top end to a common hub (or spider) assembly. The rod cluster control assemblies are used to make relatively rapid changes in reactivity and to control the axial power distribution. Figure 4.2-9 of Reference 6.1 shows a rod cluster control assembly, with Figure 4.2-10 giving detail of an individual absorber rod. [Pg.180]

The rod cluster control assemblies must be able to quickly shut down the reactor and then hold it sub-critical. [Pg.181]

The rod cluster control assemblies and the grey rod cluster assemblies together must be able to offset fast reactivity changes associated with load changes, power raising, fluctuations in the boron concentration, fluctuations in coolant temperature and fluctuations in xenon concentration. [Pg.181]

The maximum reactivity insertion rate due to withdrawal of rod cluster control assemblies or grey rod cluster assemblies must be limited by design, so that the rate of change of reactivity for the accidental withdrawal of a control bank can cause neither fuel melting nor departure from nucleate boiling. [Pg.181]

The rod cluster control assembly banks provide sufficient reactivity to overcome the power defect in going from full power to zero power, and then to provide the specified shutdown margin. The ability to accomplish shutdown from hot conditions, at end of life when the moderator temperature coefficient is at its most negative value, is demonstrated in Sections 4.S.2.4 and 4.3.2.5 of Reference 6.1. [Pg.181]

The maximum reactivity change rate for accidental withdrawal of two control banks is set such that peak linear heat rate and the departure from nucleate boiling ratio limitations are not challenged (Section 4.3.1.4.1 of Reference 6.1). Reactivity addition associated willi an accidental withdrawal of a control bank or banks is limited by the maximum rod speed (set at 1.14 m (45 inches) per minute for both rod cluster control assemblies and grey rod cluster assemblies) and by the worth of each bank (Section 4.3.1.4.2 of Reference 6.1). [Pg.181]

The reactivity worth of a rod cluster control assembly is limited to preclude rupture of file coolant pressure boundary or disruption of the core internals to a degree that would impair core cooling capability due to a rod withdrawal or an ejection accident (Section 4.3.1.4.1 of Reference 6.1). [Pg.181]

Rod Cluster Control Assembly (RCCA) out of bank measurements ... [Pg.413]

Cutaway of typical PWR rod cluster control assembly (Westinghouse). 3.1-15... [Pg.279]

See other pages where Rod cluster control assemblies is mentioned: [Pg.74]    [Pg.476]    [Pg.346]    [Pg.21]    [Pg.172]    [Pg.180]    [Pg.180]    [Pg.181]    [Pg.183]    [Pg.184]    [Pg.185]    [Pg.265]    [Pg.720]    [Pg.286]   
See also in sourсe #XX -- [ Pg.16 ]



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