Possibility of substantial reliability growth of high intensity linear ion accelerators, for solving of a number of nuclear power engineering problems is considered. A way of uninterrupted maintenance accelerating RF field in a main part of such accelerators-MPA, where particles receive the main part of energy is suggested. If each section of MPA contains 1-3 accelerating gaps and is excited from separate RF channel, the failure of one or even several channels will not destroy the resonant acceleration. Besides that it is easy to compensate the acceleration shortage (on time of channel repair) by a small automatic increase of accelerating field strength in the rest of the operating sections. The great quantity of sections from a disadvantage is transformed into advantage because failure-free MPA operation can be maintained. In the report quantitative estimations for the method suggested and its comparison with variants of the RF channel reserve are presented.

On the base of existing linear proton accelerator and shut down heavy water ITEP reactor now is creating an electronuclear installation. Wide number of investigations is supposed to be carried out at the accelerator. One direction of the works covers functioning of the linac as driver, others concern the problems of the accelerator as a high intensity middle energy ion machine for applied purposes.

Two new mutually supporting ideas to overcome problems resulting from inevitable particles loses in ADTT linac and significantly improve reliability of its operation are discussed. To decrease induced radioactivity it is proposed to insert into linac channel material with extremely low activation cross-section and to use in main part of the linac single - gap cavities (room-temperature or SC) supplied by individual force phased low power generators. Realization of these proposals allows to overcome strong physical limitations on beam losses and to reach non-stop operation of the linac in spite of failures in one or several channels of the high-beta linac part.

The lifetime of the zein mRNA in a developing corn (Zea mays L.) kernel under genome transcription blockade with actinomycin D (in vivo) and in a cell-free system (in vitro) was studied. After a 10 h blockade of gene transcription with actinomycin D, only 55% of 19 kDa zein mRNA and 40% of 22 kDa mRNA were detected in a developing kernel of normal corn. In that of the opaque-2 mutant 80% of 19 kDa zein mRNA remained. To examine the relative stability of poly(A)-containing mRNA, cell-free systems from rabbit reticulocyte lysate and wheat-germ extract were used. In both cases only 40% of 19 kDa zein mRNA and 60% of 22 kDa zein mRNA decayed during a 30 min incubation. Differential mRNA degradation of poly(A)-containing zein mRNA was observed on affinity chromatography; poly(A)-containing 19 kDa zein mRNA from normal corn partially decayed by elution from poly(U)-Sepharose whereas that from opaque-2 remained stable. These data suggest that differential mRNA stability is an important factor in the regulation of the zein gene expression in a developing corn kernel.

The first in Russia strong-focusing 25 MeV proton linac-injector I-2, computations, design and construction of which have been carried out under the guidance of Prof. I.M.Kapchinsky, will celebrate this autumn its 30-th anniversary. Output current of the beam at energy of 25 MeV year after year is 200-230 mA, down time is less than 0.5% of schedule time of about 5000 hour/year. Launched a decade before RFQ epoch coming the linac I-2 is the ''living witness'' of its physical project adequation to requirements of beam dynamics and adhere to assigned stringent tolerances that determines so long machine life.

The basic problems for construction of high intensity linear accelerator are providing of high efficiency, reliability and reduction of induced radioactivity in its parts. In the framework of ITEP feasibility stum of linac for nuclear transmutation on energy about 1 GeV with a current up to 100 mA some new version of the accelerator is considered. It is shown that the rigidity of the focusing has to be increased to prevent large particle losses. For the given value of beam current it can be achieved by the using as short lengths of focusing periods as possible. Main part of the linac consists of a large number of single-gap independent accelerating cavities. It is supposed, that the basic constructional material for these resonators will be graphite. It is shown, that such approach to design of main part of the linac allows to increase reliability of the accelerator, to reduce the requirements for mechanical tolerances of resonators and to improve parameters of a longitudinal movement of particles. It is also shown, that the replacement in large extent such conventional for linac design materials as steel, aluminium and copper on materials with small residual activation and low neutron production rate allows to increase the upper limit of permissible level of particle losses in linac. Graphite as main material of resonators will allow to build the linac with relatively low induced activization. It will provide handle maintainability at an achieved up to that time particle losses level.

The conclusion of an agreement between Russia and the USA for significantly reducing the number of nuclear warheads has made the effective peaceful use of the stockpiles of weapons-grade plutonium, a very urgent problem. Another relevant problem for all advanced countries is the transmutation of long-lived high level NPP wastes. One of the most promising ecologically pure and safe methods of plutonium conversion is to use it in subcritical accelerator-driven power reactors simultaneously for two aims - energy production and waste burning. Preliminary estimates show that in any scenario the energy is in the range 0.8-1.6 GeV and the beam current is 100-300 mA. Estimates in projects of transmutation plants show values in the same ranges, although from common considerations in the last case the current must be closer to the upper limit. The very high average beam power (hundreds of megawatts) involved requires construction of an accelerator with high efficiency (near 50%). This fact and the necessity of having extremely low beam losses make it possible to suppose that both tasks may be solved by the use of a CW linac

The gear-type vacuum press of the design developed, in which the feeder and the pressing device are made in the form of gears in contact engagement, is suitable for operation with mixtures of reduced moisture content and for production of thin walled parts of complex profile.