Qualified Post Test Transient Analysis for Station Blackout in PSB VVER Integral Test Facility

ABSTRACT

This paper deals with qualified post test transient analysis of station blackout test in PSB VVER. The transient analysis of the test is a part of Co-ordinated Research Project (CRP) of International Atomic Energy Agency (IAEA). Transient analysis of any test should be qualified. Qualification process includes ‘steady state level’ qualification and ‘on transient level’ qualification of the nodalization adopted. For steady state level qualification, the following parameters from the nodalization are compared with test specifications and errors are generated: (a) Geometrical parameters (b) Boundary conditions for assigned transient (c) Initial conditions obtained from system code output. These errors should be within the acceptable limits. The following steps are performed for qualitative evaluation of on transient level qualification: (a) Comparison between experimental and code calculation resulting time sequence of significant events (b) Identification/verification of CSNI phenomena validation matrix applicable to this test (c) Phenomenological Windows (PhW) (d) Key phenomena and Relevant Thermal-hydraulic Aspects (RTA) (e) Visual comparisons between experimental and code calculated relevant parameters time trends. All the above steps are demonstrated for the considered test and qualified transient analysis is carried out.

Keywords: Accident Analysis, CSNI, ITF, NPPs Phenomena Validation Matrix, RTA, SBO.

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