Effective Xenon Poisoning After Shut-Down of a Thermal Reactor

Journal Article · Fri Dec 01 04:00:00 EST 1961 · Kernenergie (Berlin)

OSTI ID:4792222

Wenzel, P. ^[1]

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1. VEB EPkA, Berlin (Germany)

The effect of the position dependence of the thermal neutron flux and of the lattice parameter on the transient behavior of the xenon poisoning after shut- down of the reactor was investigated for thermal reactors with solid fuel elements with the help of the perturbation theory. A factor for the stationary xenon concentration, calculated in the first approximation from the mean flux and power, was given. This factor was clearly dependent on the time after shut-down, on the mean flux or the power before shut-down, and on the position dependence of the flux and of the lattice parameter. For the xenon concentration thus calculated, which represents correctly the effect on the reactivity of the system, the maximum value and the time when it is attained were determined; furthermore, the time which must elapse up to the decay of the so-called xenon peak was given. In estimation of the critical behavior of a reactor or for the design of the control system it is safer to calculate with the effective values of the xenon concertration as estimated above as there is sharp deviation from the values obtained without consideration of the position dependence.

• Research Organization: VEB EPkA, Berlin (Germany)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
• NSA Number: NSA-16-015803
• OSTI ID: 4792222
• Journal Information: Kernenergie (Berlin), Journal Name: Kernenergie (Berlin) Vol. 4; ISSN 0023-0642
• Country of Publication: Germany
• Language: German

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
CONTROL SYSTEMS
CRITICALITY
DECAY
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ERRORS
FUEL ELEMENTS
NEUTRON FLUX
Nuclear Criticality Safety Program (NCSP)
PERTURBATION THEORY
POISONING
POWER
REACTIVITY
REACTORS
SHUTDOWN
THERMAL NEUTRONS
TRANSIENTS
VARIATIONS
XENON