Three Mile Island and Fukushima have both demonstrated accident situations where the pressure and temperature inside the reactor were unknown to operators. Conventional pressure sensors and conventional temperature sensors fail when exposed to those harsh conditions, which include high pressure, temperature, and radiation. That lack of information regarding internal state can negatively affect how an accident is handled. In order to prevent any future accidents from ever reaching a similar severity, a new self-powered wireless dual-mode sensor with a composite tungsten-boron-carbide material had been produced.

Temperature and pressure sensors are vital pieces of monitoring equipment in a nuclear reactor, especially during accident conditions where temperatures and pressures can reach 1400 degrees Celsius and 10,000 PSI respectively. Unfortunately, conventional sensors cannot operate under the high temperatures, pressures and radiation conditions that occur during an accident. By choosing to work with a composite tungsten-boron-carbide material, harmful neutron and gamma ray radiation would be effectively attenuated for the langasite sensor to operate under normal operating conditions as well as extreme accident conditions. The maximum neutron fluence was determined using a TRIM simulation which was the basis for the decision of optimal material composition and thickness of the shielding, which was determined using MCNP simulations.

The shielding material for the system were chosen as composite of tungsten-boron-carbide to effectively shield neutron and gamma radiation. The design of the radiation shield is cylindrical as shown in the figure. Appropriate thickness and the material composition of the shielding material are determined through MCNP simulation. This radiation shield enables the sensor to be functional for five years inside the core.

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  sales@chinatungsten.com
  Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
  Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
  Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Fujian Provincial Department recently issued a province's fiscal 2015 total rare earth and tungsten ore mining control targets, requires localities to strengthen management control indicators, thorough investigation of ultra indicators of production, the exploitation of the quota assigned to another person and other illegal acts.

According to Land and Resources reported news, according to Ministry of Land Resources 2015 annual allocation ionic rare earth oxides Fujian Province, the total tungsten concentrate production control indicators, Fujian Provincial Department clearly this year the province's total ionic rare earth oxide production control indicators 2000 tons; tungsten concentrate (65%) of the total production control target of 2900 tons, of which the main mining 2500 tons, comprehensive utilization of 400 tons.

Fujian Office stressed that the state of rare earth minerals protective mining, illegal mining of rare earth mine for undocumented behavior, once discovered, land and resources should be severely punished, to be submitted to the county government shut down; for to all types of construction projects on the grounds, without approval recycling of rare earth resources, all to be dealt with by unlicensed mining and closed down.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:  sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten market: Festival tungsten City needs no improvement, but tight end funds, some traders Paohuo will increase, but hold stocks strongly down the inquiry, love it or leave, tungsten spot market continued stalemate, raw material prices have been low consolidation for some time, buyers and sellers are not high enthusiasm. Product oversupply, weak demand for raw materials procurement, product prices were relatively stable, however turnover in the doldrums. Short-term stability of the tungsten market vulnerable disc, the risk is still slipped.

Molybdenum market: International Molybdenum market is still down, and molybdenum oxide record lows. The molybdenum raw materials market is still sluggish weak, poor procurement will lower molybdenum short-term market bottom is still hard to say.

Tungsten City needs no improvement, but tight end funds, some businesses Paohuo willingness increased slightly, but hold stocks down inquiry, spot transactions continued stalemate, the short-term stability of the tungsten market vulnerable disc, the risk is still slipped.

Macro, central locking 26 second round patrol units, the first time touched the rail system; five hundred billion financial guidance funds steady growth, distribution up to the vote; HSBC in June PMI initial three-month record high.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:  sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn