초록 ▼

There are provided a light water reactor core which has the same levels in cost efficiency and degree of safety as those of an existing BWR under operation now, that is, which is oriented to plutonium multi-recycle having a breeding ratio near 1.0 or slightly larger and having a negative void coeffi

There are provided a light water reactor core which has the same levels in cost efficiency and degree of safety as those of an existing BWR under operation now, that is, which is oriented to plutonium multi-recycle having a breeding ratio near 1.0 or slightly larger and having a negative void coefficient with minimizing modification of the reactor core structure of the existing BWR under operation now, and to fuel assemblies used for the boiling water reactor. The light water reactor core having an effective water-to-fuel volume ratio of 0.1 to 0.6 is formed by combining closed compact lattice fuel assemblies each composed of fuel rods having fuel which is enriched by adding plutonium or plutonium and an actinide to a uranium containing at least one of a depleted uranium, natural uranium, a degraded uranium and a low enriched uranium; high void fraction coolant of 45% to 70%; and large-diameter control rods to be inserted into the fuel assemblies, the large-diameter control rod comprising at least one absorption rod having a transverse cross-sectional area larger than a cross-sectional area of a unit lattice cell of the fuel rod.

대표청구항 ▼

There are provided a light water reactor core which has the same levels in cost efficiency and degree of safety as those of an existing BWR under operation now, that is, which is oriented to plutonium multi-recycle having a breeding ratio near 1.0 or slightly larger and having a negative void coeffi

There are provided a light water reactor core which has the same levels in cost efficiency and degree of safety as those of an existing BWR under operation now, that is, which is oriented to plutonium multi-recycle having a breeding ratio near 1.0 or slightly larger and having a negative void coefficient with minimizing modification of the reactor core structure of the existing BWR under operation now, and to fuel assemblies used for the boiling water reactor. The light water reactor core having an effective water-to-fuel volume ratio of 0.1 to 0.6 is formed by combining closed compact lattice fuel assemblies each composed of fuel rods having fuel which is enriched by adding plutonium or plutonium and an actinide to a uranium containing at least one of a depleted uranium, natural uranium, a degraded uranium and a low enriched uranium; high void fraction coolant of 45% to 70%; and large-diameter control rods to be inserted into the fuel assemblies, the large-diameter control rod comprising at least one absorption rod having a transverse cross-sectional area larger than a cross-sectional area of a unit lattice cell of the fuel rod. 3. A digital telecommunication station according to claim 1, adapted to receive a signal classification message denoting the type of digital signals received at said digital telecommunication station. 4. A digital telecommunication station according to claim 3, wherein said signal classification message is transmitted to denote transmission of digital signals of a type which differs from the type of their preceding digital signals transmitted by the digital telecommunication station during a communication session. 5. A digital telecommunication station according to claim 4, wherein said signal classification message precedes the compressed digital signals contained in the same frame. 6. A digital telecommunication station according to claim 3, wherein said signal classification message further comprises compressed information signals and stuffing bits. 7. A digital telecommunication station according to claim 6, wherein said stuffing bits represent the non-compressed form if said compressed information signals or any part thereof. 8. A digital telecommunication station according to claim 1, wherein communication sessions are initialized with a pre-selected type of signals. 9. A digital telecommunication station according to claim 8, wherein said pre-selected type of signals is voice. 10. A digital telecommunication station according to claim 3, wherein said signal classification message is transmitted only prior to the transmission of digital signals of a type which differs from the type of the signals preceding said signal classification message. 11. A digital telecommunication station according to claim 3, wherein said signal classification message is included in any message transmitted during a communication session, following at least one change in the type of the digital signals transmitted. 12. A digital communication system for interconnecting a plurality of telecommunication trunks, carrying at least two different types of signals, via a transmission path, comprising: first transmitter at at least a first end of the transmission network for transmitting digital signals; at least one pair of digital telecommunication stations each station adapted to receive at least two different types of signals and comprising: at least one detector operative to receive signals carried along a transmission path and determine their type; at least one switch controlled by said at least one detector, which channels said signals in accordance with the determination of their type; first identifier for determining whether said signals received are of a digital compressed form; second identifier for determining whether the transmission path includes at least one further operative decompressor adapted for decompressing signals when being transmitted in their compressed form; at least two pairs of compressing/decompressing devices, each adapted to compress/decompress a different type of signals; second transmitter operative in response to a determination made by said second identifier that said transmission path does not include at least one further operative decompressor adapted for decompressing the signals being transmitted in their compressed form; and third transmitter operative in response to a determination made by said second identifier that said transmission path does include at least one further operative means adapted for decompressing the signals being transmitted in their compressed form into the decompressed digital output signals; at least one further decompressor adapted for decompressing signals being transmitted in their compressed form; receiver at at least a second end of the transmission network. 13. A digital communication system according to claim 12, wherein said at least two different types of signals are selected from the group consisting of voice signals, fax signals, data signals, voiceband data signals and video signals. 14. A digital communication system according to claim 12, wherein at least one o f said digital telecommunication stations is provided with the option of establishing a communication connection with more than two other digital telecommunication stations. 15. A digital communication system according to claim 12, wherein at least one of the digital telecommunication stations is adapted to establish a communication link with a plurality of digital telecommunication stations, each located at a different end of a telecommunication network. 16. A digital communication system according to claim 14, wherein a transmission sent by at least one of said telecommunication stations, is received in parallel by at least two other digital communication stations. 17. A digital communication system according to claim 12, wherein said at least one pair of telecommunication stations is adapted to receive a signal classification message denoting the type of digital signals received at each one of the pair of digital telecommunication stations. 18. A digital communication system according to claim 17, wherein said signal classification message further comprises information for synchronizing the operation of said at least one pair of telecommunication stations operating along a transmission path. 19. A digital communication system according to claim 12, further comprising means for determining mode of operation of facsimile signals. 20. A digital communication system according to claim 12, wherein said first transmitter further comprises means for transmitting an indication of the mode of operation of facsimile signals over the transmission network and to the receiver. 21. A digital communication system according to claim 12, wherein at least one pair of telecommunication stations is selectively operated along the transmission path. 22. A digital communication system according to claim 12, further comprising message generator and message detector operative at the second end of the transmission network to detect messages transmitted by the first transmitter. 23. A method for use in a digital communication system that comprises at least a first and a second telecommunication stations and adapted to transmit at least two different types of signals, which method comprises: (i) transmitting a message comprising a sequence of characters identifying a first transmitting means, the type of signals to be transmitted and their destination; (ii) establishing a communication link between a first transmitting means and a receiving means at the transmission destination; (iii) exchanging signals between a first pair of telecommunication stations, identifying for each one of them the existence of the other and the rate for transmitting signals therebetween; (iv) transmitting a message comprising a characterization of the signals to follow; (v) transmitting information signals at the rate defined; (vi) transmitting a message denoting the end of transmission; and (vii) disconnecting the communication link between the first transmitting means and the receiving means. 24. A method according to claim 23, wherein said at least two different types of signals are selected from a group consisting of voice signals, fax signals, data signals, voiceband data signals and video signals. 25. A method according to claim 23, for interconnecting a plurality of telecommunication trunks. 26. A method according to claim 23, further comprising conducting a periodic check at the second digital communication station to confirm that at least one further digital telecommunication station is operative along the transmission path. 27. A method according to claim 23, further comprising keeping track of pre-defined compression parameters of the messages being transmitted by the first digital telecommunication station of at least one pair of digital telecommunication stations along the transmission path. 28. A digital telecommunication station adapted to receive at least voice and fax type of signals, operative in a digital communication system, and comprising: