The output of a nuclear reactor is increased by a predetermined magnitude, and the neutron beam is measured as time-series data. The temperature of the moderator in the reactor is acquired as time-series data. Time-series data on the reactivity is acquired from the time-series data on the neutron beam by the reverse dynamic characteristic method …

Legal parties

Inventors (applicants): Yasushi Hanayama, Yasunori Ohoka, Yoichiro Shimazu, Masatoshi Yamasaki, Masashi Tsuji
Assignees (initial): Nuclear Fuel Industries, Limited (Tokyo, JP)
Agents: Birch, Stewart, Kolasch & Birch, LLP (attorney)

The application was examined by Timothy A Brainard (USPTO dept. 3646)


  • 1. A method of measuring Doppler reactivity coefficient, comprising: …
  • 2. The method of measuring Doppler reactivity coefficient according to claim 1 , wherein …
  • 3. The method of measuring Doppler reactivity coefficient according to claim 2 , wherein, in said …

International priority data

JP: 2007-197130 / Jul. 30, 2007 (national)

Cited documents


  • JP 2006-105814 A, Apr. 1, 2006
  • JP 9-105796 A, Apr. 1, 1997
  • JP 2006-84181 A, Mar. 1, 2006
  • Alliston et al. US 3916444 A / 376/217, Oct. 1, 1975


Brief Description of the Drawings

FIG. 1 A schematic illustration of heat balance in the primary coolant loop of PWR. FIG. 2 A schematic illustration of the measuring system. FIG. …


Technical Field

The present invention relates to a Doppler reactivity coefficient measuring method and, more specifically, to a Doppler reactivity coefficient measuring method for directly measuring Doppler reactivity coefficient utilizing nuclear reactor …

Other Patent Relations

This application is a Continuation of copending PCT International Application No. PCT/JP2008/063557 filed on Jul. 29, 2008, which designated the United States, and on which priority is claimed under 35 U.S.C. …

Description of the Reference Signs

10 reactor core 11 ionization chamber 12 ionization chamber …

More details about Doppler Reactivity Coefficient Measuring Method

Miscellaneous patent data

Numbered 12/694,729 (application), the claim number 1 is selected as exemplary, 7 figures depict the invention details, the primary classification Testing, Sensing, Measuring, or Detecting a Fission Reactor Condition has been designated to the document, the grant number is 08462909 (publication number), the assignee is categorized as a foreign company or corporation, the patent was granted on Jun. 11, 2013, the published inventor's name is Yoichiro Shimazu, the invention is titled Doppler Reactivity Coefficient Measuring Method, developed by Yasunori Ohoka et al., the agent's company name is Birch, Stewart, Kolasch & Birch, LLP, the drawings include the following: schematic illustration of the measuring, graph showing actually measured time-series, schematic illustration of heat balance, Doppler Reactivity Coefficient Measuring Method, similar classification categories are Internal spacers or other non-active material within the casing, e.g. compensating for expansion of fuel rods or for compensating excess reactivity, Re-entrant type, cooled electrodes or target, Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain, liquids, Spectral shift control, Aqueous processes, boron, Particle beam irradiation (excluding photons), Hydrogen, chlorine, the published applicant's name is Yoichiro Shimazu, 8 claims comprise the protection scope, the examination was conducted by Timothy A Brainard (primary examiner, 3646 USPTO department), the assignee location is Tokyo (JP); its company is Nuclear Fuel Industries, Limited, the application was published on Jan. 27, 2010, the term of the patent grant was extended by 438 days, the patent is illustrated by 7 drawings, particularly claims a method of measuring Doppler reactivity coefficient, comprising…

Invention classification information

The invention is classified under Testing, Sensing, Measuring, or Detecting a Fission Reactor Condition, Monitoring, Testing, Flux monitoring. The designated search classifications include Testing, Sensing, Measuring, or Detecting a Fission Reactor Condition, Flux monitoring.

Patent details
Publication number 08462909
Publication date Jun. 11, 2013
Kind code B2
Application number 12/694,729
Application date Jan. 27, 2010
Application type U
Application series code 12
Extension term 438
National classification 376/245
Total number of claims 8
Exemplary claims 1
Number of drawings 7
Number of figures 7
Quick navigation
More similar inventions

Boiling Water Reactor (US08744034, June 3, 2014 / 12/748,979, March 29, 2010, Decay heat removal), Hiroshi Yamazaki et al. / Kabushiki Kaisha Toshiba (Tokyo, JP)

Method of Determining at Least One Technological Uncertainty Factor for Nuclear Fuel Elements, and Corresponding Methods of Designing, Fabricating, and Inspecting Nuclear Fuel Elements (US08687760, April 1, 2014 / 13/692,560, Dec. 3, 2012, Fuel Component Structure), Michel Pasquet et al. / Areva NP (Courbevoie, FR)

Digital Nuclear Control Rod Control System (US08670515, March 11, 2014 / 12/792,834, June 3, 2010, Wherein driver or motivating is electric), Charles J. Roslund et al. / Westinghouse Electric Company LLC (Cranberry Township, US)

Also viewed with this patent

Shipping Package Up-Ender (US08447006, May 21, 2013 / 11/379,082, April 18, 2006, Storage container systems for new and / or irradiated core elements), Matt W. Ales et al. / Westinghouse Electric Company LLC (Cranberry Township, US)

Power Monitoring System (US08837664, Sept. 16, 2014 / 14/062,376, Oct. 24, 2013, Flux monitoring), Naotaka Oda et al. / Kabushiki Kaisha Toshiba (Tokyo, JP)

Jet Pump and Method for Restraining Vibration of the Same (US08842799, Sept. 23, 2014 / 13/258,983, April 2, 2010, With jet pump), Tsuyoshi Hagiwara et al. / Kabushiki Kaisha Toshiba (Tokyo, JP)

New documents
  • Process for the Production of the Actinobacillus Pleuropneumoniae Toxins APXI or APXIII in a Liquid Culture Medium Under Supply of Air Enriched in Carbon Dioxide
  • Method for Manufacturing Nonvolatile Memory Device
  • Supply Chain Demand Satisfaction
  • Supply-Line Management Device
  • Storage Control Device and Method for Managing Snapshot