Transient analysis of the control/safety rods injection in MYRRHA after a power excursion incident

Lieven Vervecken; Hamid Aït Abderrahim

Transient analysis of the control/safety rods injection in MYRRHA after a power excursion incident

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Abstract

MYRRHA is a fast-spectrum irradiation facility to be constructed at SCK-CEN in Mol, Belgium. It is being designed to be operated in both sub-critical mode (coupled to a proton accelerator) as well as critical mode. In the latter mode, control rods and safety rods ensure the reactivity control and safety of the reactor. In order to support the safety file of MYRRA, one needs to prove that the insertion of a certain amount of anti-reactivity indeed stops the excursion but also limits damage to fuel pellets and fuel cladding. This means that a transient analysis of this power excursion incident followed by the insertion (with a certain time delay and fall time) of the control/safety rods needs to be performed with as a result the temperature evolution in time for the fuel pellet and fuel cladding. This will allow to judge whether the currently foreseen control/safety rod system has indeed a sufficient amount of anti-reactivity and if this anti-reactivity can be inserted fast enough. The analysis can be done by both SITHER, a single channel time-dependent code, and/or RELAP, a well-known systems code

Original language	English
Awarding Institution	BNEN - Belgian Nuclear Higher Education Network
Supervisors/Advisors	D'Haeseleer, William , Supervisor, External person Arien, Baudouin, Supervisor
Place of Publication	Mol, Belgium
Publisher	BNEN - Belgian Nuclear Higher Education Network
State	Published - Aug 2011

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Transient analysis of the control_safety rods injection in MYRRHA after a power excursion incidentFinal published version, 1.9 MBLicense: Unspecified

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title = "Transient analysis of the control/safety rods injection in MYRRHA after a power excursion incident",

abstract = "MYRRHA is a fast-spectrum irradiation facility to be constructed at SCK-CEN in Mol, Belgium. It is being designed to be operated in both sub-critical mode (coupled to a proton accelerator) as well as critical mode. In the latter mode, control rods and safety rods ensure the reactivity control and safety of the reactor. In order to support the safety file of MYRRA, one needs to prove that the insertion of a certain amount of anti-reactivity indeed stops the excursion but also limits damage to fuel pellets and fuel cladding. This means that a transient analysis of this power excursion incident followed by the insertion (with a certain time delay and fall time) of the control/safety rods needs to be performed with as a result the temperature evolution in time for the fuel pellet and fuel cladding. This will allow to judge whether the currently foreseen control/safety rod system has indeed a sufficient amount of anti-reactivity and if this anti-reactivity can be inserted fast enough. The analysis can be done by both SITHER, a single channel time-dependent code, and/or RELAP, a well-known systems code",

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N2 - MYRRHA is a fast-spectrum irradiation facility to be constructed at SCK-CEN in Mol, Belgium. It is being designed to be operated in both sub-critical mode (coupled to a proton accelerator) as well as critical mode. In the latter mode, control rods and safety rods ensure the reactivity control and safety of the reactor. In order to support the safety file of MYRRA, one needs to prove that the insertion of a certain amount of anti-reactivity indeed stops the excursion but also limits damage to fuel pellets and fuel cladding. This means that a transient analysis of this power excursion incident followed by the insertion (with a certain time delay and fall time) of the control/safety rods needs to be performed with as a result the temperature evolution in time for the fuel pellet and fuel cladding. This will allow to judge whether the currently foreseen control/safety rod system has indeed a sufficient amount of anti-reactivity and if this anti-reactivity can be inserted fast enough. The analysis can be done by both SITHER, a single channel time-dependent code, and/or RELAP, a well-known systems code

AB - MYRRHA is a fast-spectrum irradiation facility to be constructed at SCK-CEN in Mol, Belgium. It is being designed to be operated in both sub-critical mode (coupled to a proton accelerator) as well as critical mode. In the latter mode, control rods and safety rods ensure the reactivity control and safety of the reactor. In order to support the safety file of MYRRA, one needs to prove that the insertion of a certain amount of anti-reactivity indeed stops the excursion but also limits damage to fuel pellets and fuel cladding. This means that a transient analysis of this power excursion incident followed by the insertion (with a certain time delay and fall time) of the control/safety rods needs to be performed with as a result the temperature evolution in time for the fuel pellet and fuel cladding. This will allow to judge whether the currently foreseen control/safety rod system has indeed a sufficient amount of anti-reactivity and if this anti-reactivity can be inserted fast enough. The analysis can be done by both SITHER, a single channel time-dependent code, and/or RELAP, a well-known systems code

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KW - RELAP

KW - safety rod

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_123806

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