Method and apparatus for protecting a PWR from departure from nu

Details Method and apparatus for protecting a PWR from departure from nu Method and apparatus for protecting a PWR from departure from nu

1995-11-15

1997-05-20

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By electronic signal processing circuitry

376247, G21C 736

Patent

active

056319371

ABSTRACT:
A pressurized water reactor (PWR) is protected from departure from nucleate boiling and from hot leg boiling by generating a segmented delta temperature trip function having a first line segment which closely follows the departure from nucleate boiling core limit line and a second segment closely following the hot leg boiling core limit line. Each line segment is a function of the average core temperature and coolant pressure with the departure from nucleate boiling segment further adjusted for axial power distribution. The two set points are continuously compared to actual delta temperature in four independent channels. If either set point is exceeded in at least two channels, the reactor is tripped.

REFERENCES:
patent: 3791922 (1974-02-01), Musick
patent: 4318778 (1982-03-01), Musick
patent: 4427620 (1984-01-01), Cook
patent: 4783307 (1988-11-01), Galligan et al.
patent: 5379328 (1995-01-01), Perez et al.

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