In countries with developed nuclear energy, there are problems associated with non-uniformity of the daily electricity load, due to the economically justified need to load nuclear power plants with a maximum installed capacity utilization factor. This is due to the cheapness of nuclear fuel compared to organic and, at the same time, high investment compared to thermal power plants, as well as the presence of technological limitations on maneuverability. Most organic fuel thermal power plants are switched to half-peak mode, which negatively affects their efficiency and reliability.

In addition, the ever-increasing requires on the level of safety negatively affect the economic competitiveness of nuclear power plants. Improving safety through the introduction of passive heat removal systems of the reactor core is provided for in new NPP projects. These systems have several disadvantages: maintenance costs; a significant increase in capital investment; emergency cooling mode.

To solve these problems, the authors developed a system of hydrogen-thermal accumulation, which, when combined with a nuclear power plant, allows one to accumulate cheap energy during the hours of a decrease in load in the power system due to electrolysis of water to produce hydrogen and oxygen, and thermal accumulation of hot water in heat-insulating tanks. Thanks to the use of hot water tanks, investment in the accumulation system is significantly reduced. Thanks to the use of a hydrogen-oxygen steam generator, the opportunity to generate an additional main steam and to use it in the additional steam turbine unit appears, which will allow to avoid costly modernization of the main equipment of the nuclear power plant and reducing its lifetime. The presence of a low-power steam turbine unit as part of the accumulation system ensures uninterrupted autonomous power supply to consumers of the NPP own needs due to the possibility of using the energy of the reactor residual heat, when the station is completely blackout. The method of combining the hydrogen complex with thermal accumulators is completely new and has no analogues.

The economic efficiency of the developed energy complex has been investigated. The accumulated net present value was determined depending on the off-peak electricity tariff for the three options of the half-peak electricity tariff, taking into account possibility to refuse expensive heat exchangers of the passive heat removal systems. It is shown that the use of the proposed scheme is advisable in regions with off-peak electricity tariffs in the range 0–0.32 cents/kW·h, 0–0.8 cents/kW·h and 0–1.25 cents/kW·h, respectively, depending on the forecast dynamics of the half-peak electricity tariff. The average payback period of the accumulation system for given conditions is equal to 3–15 years.

在核能发达的国家，存在与日常电力负荷不均匀相关的问题，这是由于经济上合理的需要以最大装机容量利用系数加载核电站。这是由于核燃料与有机燃料相比便宜，同时与火力发电厂相比投资高，以及在机动性方面存在技术限制。大多数有机燃料热电厂都切换到半峰模式，这对其效率和可靠性产生了负面影响。

此外，对安全水平不断提高的要求对核电站的经济竞争力产生负面影响。在新的核电厂项目中规定通过引入反应堆堆芯的被动排热系统来提高安全性。这些系统有几个缺点：维护成本；资本投资显着增加；紧急冷却模式。

为了解决这些问题，作者开发了一种氢热积累系统，当与核电站结合使用时，可以在电力系统因水电解而降低负荷的时间段内积累廉价能源产生氢气和氧气，并在隔热罐中积聚热水。由于使用了热水箱，蓄水系统的投资显着减少。由于使用氢氧蒸汽发生器，出现了产生额外主蒸汽并将其用于额外蒸汽涡轮机组的机会，这将允许避免核电厂主要设备的昂贵现代化并减少它的生命周期。由于在电站完全停电时可以使用反应堆余热的能量，作为蓄能系统一部分的低功率汽轮机机组的存在确保了向核电厂自身需求的消费者不间断的自主供电。将氢配合物与蓄热器结合的方法是全新的，没有类似物。

已开发能源综合体的经济效率已被调查。累计净现值是根据半峰电价三个选项的非高峰电价确定的，同时考虑到拒绝昂贵的被动排热系统热交换器的可能性。结果表明，在非高峰电价范围为 0-0.32 美分/kW·h、0-0.8 美分/kW·h 和 0-1.25 美分/kW·h 的地区，建议使用该方案。分别取决于半峰电费的预测动态。在给定条件下，积累系统的平均投资回收期等于 3-15 年。