Patent application number | Description | Published |
20080317191 | OPERATING METHOD OF NUCLEAR REACTOR AND NUCLEAR POWER GENERATION PLANT - The present invention decreases the temperature of feed water supplied to the reactor of a set power when the flow rate of coolant supplied to the core of the reactor increases in the end of an operation cycle. This operating method can increase the thermal power of the nuclear power generation plant and increase the economical efficiency of fuel even when the operation cycle is prolonged. Particularly, even when the core flow rate increases in the end of the operation cycle, this method can suppress the rise of the cooling water temperature at the inlet of the core. Consequently, this invention can make the reactivity gain higher than that when the core flow rate is singly increased. | 12-25-2008 |
20090041174 | Reactor Core - A reactor core, comprising: | 02-12-2009 |
20090141847 | METHOD FOR OPERATING NUCLEAR POWER GENERATION PLANT AND NUCLEAR POWER GENERATION PLANT - An method for operating a nuclear power generation plant, comprising the steps of:
| 06-04-2009 |
20090252282 | Fuel Assembly - A fuel assembly, comprising:
| 10-08-2009 |
20100128833 | Reactor Core - A reactor core, comprising:
| 05-27-2010 |
20100170246 | OPERATION METHOD OF NUCLEAR POWER PLANT - In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle. | 07-08-2010 |
20110162363 | OPERATION METHOD OF NUCLEAR POWER PLANT - In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle. | 07-07-2011 |
20110162364 | OPERATION METHOD OF NUCLEAR POWER PLANT - In a nuclear power plant, thermal power in a second operation cycle of a nuclear reactor is uprated from thermal power in a first operation cycle preceding the second operation cycle by at least one operation cycle. A proportion of steam extracted from a steam system and introduced to a feedwater heater, which is in particular extracted from an intermediate point and an outlet of a high pressure turbine, with respect to a flow rate of main steam, is reduced in the second operation cycle from that in the first operation cycle such that the temperature of feedwater discharged from the feedwater heater is lowered by 1° C. to 40° C. in the second operation cycle. | 07-07-2011 |
20120063561 | FUEL ASSEMBLY - A fuel assembly has a constitution in which plural fuel rods are arranged in 10 rows by 10 columns in a channel box, and includes plural fuel rods G containing gadolinium and plural partial length fuel rods P. In the fuel assembly, average enrichment of lower portion cross section is approximately 4.6 wt %, and average enrichment of upper portion cross section is approximately 4.7 wt %. The average enrichments at the outermost layer are approximately 5.6 wt % both in the upper portion and the lower portion. Ratios e/x of the average enrichment of the outermost layer e (wt %) to the average enrichment of the fuel assembly cross section x (wt %) are 1.19 in the upper portion and 1.22 in the lower portion, and the ratios satisfy equation (1). | 03-15-2012 |
20130003908 | BOILING WATER REACTOR CORE AND FUEL ASSEMBLIES THEREFOR - A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment concentration of the fuel assembly, or mixed oxide containing not less than 2 wt %, but less than 6 wt % in the average enrichment concentration of fissile plutonium of. In the burner type BWR core on which the fuel assemblies are loaded, an average weight density of uranium, plutonium and minor actinides is 2.1 to 3.4 kg/L as a conversion at the value of unburned state. | 01-03-2013 |
20130051509 | Initial Core of Nuclear Reactor and Method of Loading Fuel Assemblies of Nuclear Reactor - In an initial core of a nuclear reactor, a plurality of water regions having a square cross section for occupying a cross sectional area capable of disposing four fuel assemblies are formed. No fuel assemblies are loaded in these water regions. In the initial core, each fuel assembly is supported by fuel supports. A pressure loss of a first orifice installed in a cooling water supply passage formed in first fuel supports disposed in a central portion of the initial core is larger than that of a second orifice installed in a cooling water supply passage formed in second fuel supports disposed in a peripheral portion surrounding the central portion. Each water region is formed right above a part of the first fuel supports disposed in the central portion. The control rod operation in the nuclear reactor can be simplified by action of cooling water in the water regions. | 02-28-2013 |
Patent application number | Description | Published |
20080205218 | Optical disc drive and method for processing recorded data - This invention provides a technique which ensures that if a recording error occurs in an optical disc, recorded data will be immediately erased from the disc without leaking to third parties. While recording data onto the optical disc, a controller judges whether the recording process has been executed to completion properly. If the recording process is judged to have failed, the controller will stop the recording process and activate an optical pickup to erase recorded data from the data-recording area on the optical disc by overwriting this area with required erasing data. | 08-28-2008 |
20090323947 | METHOD OF CONFIRMING DRIVE UNIQUE KEY AND OPTICAL DISC RECORDING/REPRODUCING APPARATUS - In an apparatus which encrypts and records, or decrypts and reproduces content necessitated copyright protection using a plurality of encryption keys, the encryption key unique to a drive apparatus is stored into a memory in the apparatus at the time of manufacturing the apparatus. | 12-31-2009 |
20090327359 | METHOD OF CHECKING VERSION NUMBER OF ENCRYPTION INFORMATION, AND OPTICAL DISC PLAYBACK DEVICE - In the case of a BD or the like, when encryption information used for copyright protection is updated, the version number of defective encryption information is stored into an area of a commercial medium other than the content recording area, and the user is prompted to update to a newer version number. | 12-31-2009 |
20100091628 | MULTILAYER-OPTICAL-DISC DATA-ERASURE METHOD AND OPTICAL DISC APPARATUS - In response to the trend toward the increase in the number of data layers of optical discs, the invention provides a data erasure method and its optical disc apparatus that enable faster data erasures with a simpler configuration. Test erasures are performed on the test areas T of data layers of an optical disc while the power level Pe of data erasure laser light and the defocus amount Δf of the data erasure laser light from a target data layer are changed. Based on the results of the test erasures, the optimal erasure condition that enables a simultaneous data erasure from the greatest number of data layers is determined. Based on the determined optimal erasure condition, then, the optimal erasure sequence that enables data erasure from all of the data layers with the fewest number of times is determined. | 04-15-2010 |
20100110851 | MULTILAYER-OPTICAL-DISC DATA-ERASURE METHOD AND OPTICAL DISC APPARATUS - An optical-disc testing apparatus performs test erasures on the test areas T of data layers of an optical disc while changing the power level Pe of data erasure laser light and the defocus amount if of the data erasure laser light from a target data layer. The optical-disc testing apparatus determines an optimal erasure condition that enables a simultaneous data erasure from the greatest number of data layers and an optimal erasure sequence that enables data erasure from all of the data layers with the fewest number of times. The determined optimal erasure condition and sequence are registered on the memory of an optical disc apparatus. The optical disc apparatus reads the registered optimal erasure condition and sequence of the optical disc from its memory and erases data from each of the data layers of the optical disc based on the read optimal erasure condition and sequence. | 05-06-2010 |