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SGLM 504

Steam Generator Leakage Monitor

Used for detecting the gamma radiation from activation or fission products in the secondary loop of pressurized water reactors (PWR), which is an indication of a leakage in the physical barrier between the primary and the secondary loop (e.g. N-16 or radioactive noble gases in the main steam line).

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Data Sheet

Tag Features

  • Measure gamma radiation e.g. from decaying N16 or noble gases in the main steam line of a PWR
  • Provide isolated analog outputs (0/4 to 20 mA) for the measured count rate (log. scale)
  • Provide isolated relay outputs for high alarm, system fault and test mode active
  • Adjustable pulse-height discrimination threshold (optionally with discrimination window)
  • Qualified to perform Cat. A safety functions acc. to the IEC 61226 and is qualifi ed acc. IEC 60780 and IEEE 323, and IEC 60880 for SW.
  • Seismic qualifi cation acc. IEEE 344 and IEC 60980
  • High level of safety due to continuous status monitoring (e.g. operating voltages or SW code integrity)
  • Built in test signal generators for periodic testing of signal processing (remote activation possible)

Description

The Steam Generator Leakage Monitor SGLM 504 is used for detecting the gamma radiation from activation or fission products in the secondary loop of pressurized water reactors (PWR), which is an indication of a leakage in the physical barrier between the primary and the secondary loop (e.g. N-16 or radioactive noble gases in the main steam line).

The gamma radiation is detected by the NaI(Tl) scintillation probe of type SG 66 R. Due to its robust design the detector can operate under difficult ambient conditions without requiring additional mechanical or thermal shielding. Integral part of the probe is a pre-amplifier for pulse pre-processing and stabilization.

The associated signal processing unit DAK 250-i of the SGLM 504 forms part of the proTK™ platform of digital measurement channels and has been designed and is qualified to meet the requirements of the German KTA 3505, the IEC 60780 and the IEEE 323 for class 1E systems. The software of the DAK 250-i is certified for Cat. A functions acc. to the IEC 61226 and IEC 60880.

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