Blackout accident management strategies at nuclear power plants

Skalozubov, V.; Grib, V. Yu.; Korolev, A. V.; Gablaya, T. V.; Kochneva, V. Yu.

doi:10.31717/2311-8253.19.2.2

Cited by 1 publication

(2 citation statements)

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“…However, the general shortcomings of probabilistic methods due to the uncertainty of the calculated estimates [5] and the use of leakage cost data obtained by the regulatory indirect method [2] determine the need for further improvement of the methods for justifying the frequency of CI HPT outages.…”

Section: Analysis Of Literature Sourcesmentioning

confidence: 99%

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Qualification of Compensatory Test Methods Involving Pressure Increase in the VVER Containment System

Komarov,

Dorozh,

Filatov

2023

Nucl. and Rad. Safe.

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In general, containment leakage testing of nuclear power plants with VVER reactors by elevated pressures using the compensatory leakage detection method (CLDM) can be performed at pressures and pressure increase rates higher than those stipulated by the regulations using the absolute pressure method (AP method). Elevated pressures and pressure increase rates under certain conditions can violate safety limits of the containment systems and/or decrease the reliability/life of containment structures and equipment. These factors determine the need to qualify the CLDM to promote conditions for reliability and safety. A non-stationary thermodynamic model of the qualification conditions for CLDM testing of the containment was developed. The criteria for CLDM qualification conditions are the maximum allowable pressure and pressure increase rate during testing. The CLDM condition for recording leakage in the containment is pressure stabilization in the containment systems. Based on the developed CLDM thermodynamic model, it was established that the containment leakage rate is determined by the flow rate of air entering the containment systems and by the thermodynamic state of the air inside and outside the containment systems. The established qualification conditions were used to determine conditions for the minimum recorded leakage sizes within CLDM and the maximum allowable ambient air flow rates and test duration. A prerequisite for justifying the qualification and implementation of the CLDM is to revise/amend regulatory and technical requirements for the maximum allowable pressure and pressure change rate in the containment systems and for the conditions for disconnecting containment systems passive heat removal systems (if any) during testing.

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Section: Analysis Of Literature Sourcesmentioning

confidence: 99%

“…The equation of the mass and heat balance of the volume V o in the unsteady-state mode of air supply from the environment [5] is as follows:…”

Section: Qualification Conditions Of the Cldmmentioning

confidence: 99%