Relationship of core exit-temperature noise to thermal-hydraulic conditions in PWRs

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6636104

Sweeney, F J; Upadhyaya, B R

Core exit thermocouple temperature noise and neutron detector noise measurements were performed at the Loss of Fluid Test Facility (LOFT) reactor and a Westinghouse, 1148 MW(e) PWR to relate temperature noise to core thermal-hydraulic conditions. The noise analysis results show that the RMS of the temperature noise increases linearly with increasing core ..delta..T at LOFT and the commercial PWR. Out-of-core test loop temperature noise has shown similar behavior. The phase angle between core exit temperature noise and in-core or ex-core neutron noise is directly related to the core coolant flow velocity. However, if the thermocouple response time is slow, compared to the coolant transit time between the sensors, velocities inferred from the phase angle are lower than measured coolant flow velocities.

• Research Organization: Oak Ridge National Lab., TN (USA); Tennessee Univ., Knoxville (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6636104
• Report Number(s): CONF-830103-39; ON: DE83006144
• Country of Publication: United States
• Language: English

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