Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1995-03-28
1996-10-22
Chilcot, Richard
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
376258, G01F 2300, G21C 1700
Patent
active
055665713
ABSTRACT:
A differential pressure detection equipment typically represented by a water level measuring apparatus provided for a nuclear power plant includes a condenser having a steam flow-in port connected to a steam phase side pressure detector through a connection pipe, a reference water column side instrument pipe connected to a bottom portion of the condenser, a variable water column side instrument pipe connected to a liquid phase side pressure detector and a pressure difference detector connected to both the instrument pipes for detecting a pressure difference between a reference water head pressure of the reference water column side instrument pipe and a variable water head pressure of the variable water column side instrument pipe. The connection pipe has an upward inclination .theta. from the steam phase side pressure detector to the condenser so as to satisfy an equation of 0<tan .theta.<D/L, in which D is an inner diameter of the connection pipe and L is an axial length of the connection pipe. These characteristic features are applied to the differential pressure detecting apparatus in which high and low pressure side detectors are connected to the condensers, respectively, and the connection pipes have substantially the same structure as that mentioned above.
REFERENCES:
patent: 3371534 (1968-03-01), Areley
patent: 4394346 (1983-07-01), Movooka
patent: 4721071 (1988-01-01), Fujigaya et al.
Northeast Utilities, "Licensee Event Report 91-008-00", dated Apr. 17, 1991.
NRC Information Notice No. 92-54, "Level Instrumentation Inaccuracies Caused by Rapid Depressurization", dated Jul. 24, 1992.
NRC Generic Letter No. 92-04, "Resolution of the Issues Related & Reactor Vessel Water Level Instrumentation in BWRs Pursuant to 10CFR50.54(f)", dated Oct. 16, 1992.
NRC Bulletin 93-03, "Resolution of Issues Related to Reactor Vessel Water Level Instrumentation in BWRs", dated May 28, 1993.
Kasai Eijoe
Masuda Tomohiko
Amrozowicz Paul D.
Chilcot Richard
Kabushiki Kaisha Toshiba
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