摘要:
A duct for a nuclear fuel assembly includes a tubular body and an elongated member. The tubular body has a sidewall with an inner face and an outer face and is configured to contain nuclear fuel within a fuel region. The elongated member extends from the outer face along at least a portion of the fuel region and has a contact surface configured to stabilize the duct during operation of the nuclear fuel assembly.
摘要:
The support insert (22) is for a nuclear fuel assembly spacer grid comprising interlaced straps (18) defining a lattice of cells (20) for receiving fuel rods (4), the insert (22) being adapted to be secured to the straps (18) for extending in at least one cell (20). The insert (22) extends along an axis (B) intended to be parallel to that of a cell (20) and comprises two axially spaced end portions (26) for connecting the insert (22) to the straps (18) and at least one elongated blade-like spring (28) extending axially between the end portions (26) for supporting a fuel rod (4). The spring (28) has a non-rectilinear cross-section in each plane perpendicular to the insert axis (B).
摘要:
The invention relates to a nuclear fuel assembly for a boiling water reactor comprising a base (2), a head, and a bundle of full length fuel rods and partial length fuel rods (11), said bundle extending upwardly and longitudinally from the base (2) to the head, the nuclear fuel assembly (1) comprising at least one clamp (33) for longitudinally retaining a lower plug (13) of a partial length fuel rod (11) with respect to the base (2). The clamp (33) is an additional part fitted to the base (2), the clamp (33) is at least partially received in a housing (30) provided in the base (2), and the clamp (33) is assembled to the base (2) by mechanical engagement of complementary assembly means.
摘要:
A fuel inlet mechanism to introduce a coolant into a fuel assembly configured to be charged in a light water nuclear reactor, includes, a filter catching a foreign substance included in the coolant on an upstream side of the fuel assembly, the filter having a plurality of through holes to pass the coolant, and the through holes having an inlet portion, an outlet portion and at least one bent portion to a degree by which the outlet portion cannot be seen through from the inlet portion by a straight line.
摘要:
A two part lower tie plate assembly is disclosed for use with a fuel bundle of a boiling water nuclear reactor. The two parts include a rod supporting grid section (G) and nozzle section (N). Both the rod supporting grid section (G) and the nozzle section (N) are constructed asymmetrically. The rod supporting grid section (G) contains one half of the total offset required for a D lattice lower tie plate and the nozzle section (N) contains one half of the total offset required for a D lattice lower tie plate. When a D lattice lower tie plate is required, assembly occurs so that the offsets are additive. When a C lattice lower tie plate is required, assembly occurs so that the offsets are subtractive. Assembly of the lower tie plate is provided be either bolting or welding. There results one single rod supporting grid and one nozzle section capable of assembly to fit either a C or a D lattice.
摘要:
Stift und Werkzeug zur Verankerung in einer Bohrung einer Platte oder Wand An dem zu verankernden Ende des Stiftes (1), der z.B. als Zentrierstift für Brennelemente dient, ist ein quer zu seiner Längsachse verlaufender Ausschnitt (2) mit trapezförmigem Querschnitt vorgesehen, In dem Ausschnitt ist ein Keil (5) angeordnet, welcher über einen Faltsteg (6) mit dem Stift (1) verbunden ist. Dem Keil (5) ist ein Dorn (9) zugeordnet, der in eine koaxiale Bohrung (8) des Stiftes (1) von dessen freiem Ende her einführbar ist. Mittels eines Werkzeuges wird über den Dorn (9) eine Kraft auf den Keil (5) im Sinne eines Ausstellens und Verankerns von zwei durch den Ausschnitt (2) gebildeten Flanken (3, 4) übertragen.