摘要:
A portion of the plastic container T where an opening 7 is provided has a flange portion 7a, and provided are a recess provided annularly along a peripheral edge of the opening 7 at an outside of the plastic container body 2, with an annular member being embedded integrally in the recess, a cover 1 resting against the flange portion to close the opening 7, a seal 14 provided between the flange portion 7a and the cover 1 to prevent a leak, and an annular retainer 9 fastened to the annular member 8 while resting against an external surface of the cover 1. This allows the opening 7 provided in the plastic container T and the cover 1 to be fastened together firmly with excellent and stable hermetical sealing performance.
摘要:
A grounding structure of a fuel tank equipped with a lid body closing an opening of the fuel tank made of resin is characterized by being equipped with a ring-shaped member made of metal fixed on the periphery of the opening, and a retainer made of metal fixing the lid body on the ring-shaped member, wherein an electrically grounded member in the vicinity of the lid body is electrically connected to at least one of the ring-shaped member and retainer, and grounding is performed through at least one of the ring-shaped member and retainer.
摘要:
A vaporized fuel processing device attached to a fuel tank, includes a casing for forming an outer shell of the vaporized fuel processing device, a diaphragm valve unit opened at the time of increasing the pressure in the fuel tank, and a vent passage communicating with atmospheric air. In the vaporized fuel processing device, the diaphragm valve unit is disposed in a space formed in the casing.
摘要:
[Solving Means] A resonance calculation program is configured to calculate an effective cross section including Step S4 of setting a calculation point in the gray range in the resonance region; Step S5 of calculating a neutron flux set at the calculation point and corresponding to a macroscopic cross section based on Method of Characteristics; Step S6 of fitting a fitting equation to the calculated macroscopic cross section and the calculated neutron flux, and calculating first and second rational coefficients; Step S7 of calculating a background cross section based on the first rational coefficient; Step S8 of interpolating the effective cross section, with the background cross section used as an argument; Step S9 of calculating the neutron flux based on the background cross section; and Step S10 of calculating the effective cross section based on the effective cross section, the neutron flux, and the second rational coefficient obtained at the coefficient calculation step.
摘要:
[Problem to be Solved] To provide a resonance calculation program capable of evaluating a physical quantity such as an effective cross section in a radial direction of a circular region of a fuel rod by making a resonance calculation based on the equivalence principle.[Solution] A resonance calculation program for calculating an effective cross section by performing a resonance calculation based on an equivalence principle includes a radial-distribution calculation step S8 of calculating a distribution of the effective cross section in a radial direction of a circular region by calculating the effective cross section defined by a predetermined calculation expression including a geographical coefficient for each of a plurality of annular regions while a neutron escape probability in a resonance region is expressed by a polynomial rational expression including the geographical coefficient serving as a factor representing geographical shapes of a plurality of annular regions that are circumferentially annular and that are obtained by radially dividing the circular region that is an axial cross section of a fuel rod at predetermined intervals.
摘要:
[Problem to be Solved] To provide a resonance calculation program capable of evaluating a physical quantity such as an effective cross section in a radial direction of a circular region of a fuel rod by making a resonance calculation based on the equivalence principle.[Solution] A resonance calculation program for calculating an effective cross section by performing a resonance calculation based on an equivalence principle includes a radial-distribution calculation step S8 of calculating a distribution of the effective cross section in a radial direction of a circular region by calculating the effective cross section defined by a predetermined calculation expression including a geographical coefficient for each of a plurality of annular regions while a neutron escape probability in a resonance region is expressed by a polynomial rational expression including the geographical coefficient serving as a factor representing geographical shapes of a plurality of annular regions that are circumferentially annular and that are obtained by radially dividing the circular region that is an axial cross section of a fuel rod at predetermined intervals.
摘要:
A thermoplastic polymer containing glutaric anhydride units of the following general formula (1) and having an absorbance at a wavelength of 280 nm of at most 0.5 (the absorbance is a value of the polymer film having a thickness of 100 μm, measured with a UV-visible spectrophotometer) and a glass transition temperature of not lower than 130° C. has high-level colorless transparency and good heat resistance, moldability and dwell stability. wherein R1 and R2 are the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 5 carbon atoms.
摘要:
[Problem to be Solved] To provide a nuclear-characteristic calculating program that can suppress an increase of calculation time without degrading calculation accuracy when calculating a nuclear characteristic of a fuel rod that contains burnable poison.[Solution] A nuclear-characteristic calculating program for calculating a nuclear characteristic of a fuel rod that contains nuclear fuel and burnable poison includes a first scattering model that can represent a simple scattering of the neutron and a second scattering model that can represent a complicated scattering of the neutron. The nuclear-characteristic calculating program includes Step S3 of calculating, when a burnup of the fuel rod is before a set burnup at which the burnable poison is considered to lose neutron absorption capability, the nuclear characteristic of the fuel rod by using the second scattering model, Step S11 of switching, when the burnup of the fuel rod is the set burnup, the scattering model from the second scattering model to the first scattering model, and Step S13 of calculating, after performing Step S11, the nuclear characteristic of the fuel rod by using the first scattering model.
摘要:
The present invention relates to a thermoplastic resin composition which contains a thermoplastic polymer (A) containing a glutaric anhydride-containing component shown in the following general formula (1), where R1 and R2 are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and a rubber-containing polymer compound (B), and satisfies the following conditions of (I) and/or (II), (I) a total light transmittance per 2 mm of the thickness of the thermoplastic resin composition is more than 90%, (II) a weight-average molecular weight of a thermoplastic polymer (A) is from 30,000 to 150,000 and a glass transition temperature is at least 130° C. According to the present invention, a thermoplastic composition having high heat resistance, superior mechanical properties, colorless transparency, optical isotropy and moldability, as well as solvent resistance, is provided.
摘要:
A moderator temperature coefficient measuring device include a control rod driving device; a reactivity measurement processing unit capable of measuring the reactivity of the reactor; an inflow temperature sensor for sensing the inflow temperature of a reactor coolant flowing into the reactor; an outflow temperature sensor for sensing the outflow temperature of the reactor coolant flowing out of the reactor; an average temperature measurement processing unit for measuring the average temperature from the sensed inflow and outflow temperatures; an power control unit for providing control so that the reactor delivers constant thermal power; and a temperature coefficient calculating unit for calculating the temperature coefficient of the reactor coolant based on the amount of change in reactivity between before and after the insertion of the control rod and the amount of change in average temperature between before and after the insertion of the control rod under the constant thermal power.