Abstract： IEC 61502:1999 pdf free download.Nuclear power plants - Pressurized water reactors - Vibration monitoring of internal structures. 2.2 core barrel clamping system hold-down spring (see figure 1) or any oilier structure (e.g. springs) compres...

IEC 61502:1999 pdf free download.Nuclear power plants - Pressurized water reactors - Vibration monitoring of internal

structures.

2.2

core barrel clamping system

hold-down spring (see figure 1) or any oilier structure (e.g. springs) compressed between upper and lower internals

2.3

thermal shield

metallic structure mounted around the core barrel, attached to it by clamps, intended to limit embrittlement of the pressure vessel steel under radiation (see figure 1). Not all reactors are fitted with this type of structure

2.4

ex-core neutron detector

ionization sensor situated outside me vessel (on a level with the core), measuring the neutron flux in order to monitor reactor

power (see figures 1 and 2)

2.5

neutron noise

fluctuations in the neutron flux caused by variations in emission at the neutron source, or by variations in the transport of

neutrons towards the outside of the vessel. Ex-core neutron noise corresponds to the fluctuations in the signal emitted by an

ex-core neutron detector and is proportional to the signal of fluctuations in the flux reaching the detector.

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