公开(公告)号：US20170206983A1

公开(公告)日：2017-07-20

申请号：US14997557

申请日：2016-01-17

申请人： YOUSEF M. FARAWILA

发明人： YOUSEF M. FARAWILA

IPC分类号： G21C3/04 ,  G21C3/32 ,  G21C3/60 ,  G21C3/07

CPC分类号： G21C3/04 ,  G21C3/07 ,  G21C3/32 ,  G21C3/328 ,  G21C3/60 ,  G21C7/32 ,  Y02E30/31 ,  Y02E30/38 ,  Y02E30/39

摘要： A method of stabilizing density wave oscillations in boiling water reactor cores is disclosed. The invention introduced a thin metallic fuel element made of fissile isotope baring metal encased and bonded with metallic cladding. The thin construction and the metallic material guarantee very short thermal time constant compared with the oscillation period. Although the feedback of the processes involved in density waves are negative, i.e. oppose any initial perturbation, sufficiently strong feedback may result in unstable behavior because of the time delay inherent in the propagation of the density wave and the heat conduction delay in the traditional fuel rods made of ceramic pellets encased in zircaloy tubes. The new fuel element of this invention introduces fast, not delayed, thermal energy to the coolant in response of any neutron flux perturbation, and thus introduces a stabilizing feedback. Boiling water reactor fuel bundles may benefit from this invention by including the new fuel element as part of its array of fuel rods, preferably filling in the space vacated by part-length fuel rods.

公开(公告)号：US20170040072A1

公开(公告)日：2017-02-09

申请号：US14817183

申请日：2015-08-03

申请人： YOUSEF M. FARAWILA

发明人： YOUSEF M. FARAWILA

IPC分类号： G21C17/00

CPC分类号： G21C7/36 ,  G21C17/108 ,  G21D3/001 ,  Y02E30/31 ,  Y02E30/39

摘要： This invention introduces a new method for detecting power oscillations that may occur in Boiling Water Reactor (BWR) cores. According to this invention, the Average Power Range Monitor (APRM) is enabled to detect power oscillations even when the signals from the Local Power Range Monitors (LPRMs) that make up the APRM signal are not in-phase and tend to cancel out. The asymmetric filtering algorithm that is the core of this invention is applied to the individual LPRM signals before they are summed up to make a new APRM signal. The new APRM signal will increase when oscillations occur, regardless of the instability type, and can thus be used for detecting reactor instability and enable the operator or automatic reactor protection systems to actuate and prevent reactor fuel damage.

摘要翻译： 本发明引入了一种用于检测沸腾反应堆（BWR）核心中可能发生的功率振荡的新方法。 根据本发明，即使来自构成APRM信号的本地功率范围监视器（LPRM）的信号不是同相并且倾向于抵消，平均功率范围监视器（APRM）也能够检测功率振荡。 作为本发明核心的非对称滤波算法在将它们相加之前被应用于各个LPRM信号以产生新的APRM信号。 无论不稳定类型如何，当发生振荡时，新的APRM信号将增加，因此可用于检测反应堆不稳定性，并使操作员或自动反应堆保护系统能够起动并防止反应堆燃料损坏。