Category Archives: Handbook Nuclear Terms

Reactivity

When a nuclear power-reactor plant is generating electrical energv at a steadv or constant rate, the reactor is in a steady state m which the neutron density is fixed, the temperatures at various positions in the reactor are con­stant, etc Equations 1 7 and 1 8 show that, since dn/dt = dC,/dt = 0 in this steady state, the effective […]

Read more

IN-CORE ENVIRONMENT

The environment in which an in core sensor operates is hostile to both the sensor materials and the means of transmitting signals to the readout instruments In most cases the environment includes high neutron flux (>lo’ 2 neutrons enrr2 sec1), intense gamma fields (>108 R/hr), elevated temperature (>500°F or 210°C), and high pressure (>1000 psi), along with other undesirable effects, […]

Read more

WATER PROPERTIES SENSING

4- 7.1 Steam-Generator Feedwater Specifications Feedwater conditioning is required to maintain opera­tional capability of the steam generator The steam­generating surfaces remain clean and heat-transfer capa­bilities are favorable if good water quality is maintained The minimum standards given in Table 4 19 should be maintained for satisfactory feedwater quality.

Read more

Use of Out-of-Core Sensors in Reactors

The application of nuclear instrumentation demands an understanding of the behavior of a reactor. Because power density varies with position in the reactor, an average power measurement is needed. Out-of-core detectors are con­sidered to be spatially averaging and are discussed here from this viewpoint. Detectors for measuring spatial variations in nuclear fluxes are discussed in Chap. 3. Out-of-core detectors are […]

Read more

Self-Powered Detectors

Self-powered detectors24 operate on the well — publicized principle of the nuclear battery. The incident — neutron flux activates a central electrode, which emits betas that are collected by a surrounding electrode. This type detector is usually designed for in-core neutron-flux sensing. It is discussed in Chap. 3, Sec. 3-3.3.

Read more
1 2 3 4 5 13