Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor.

Ishida, Toshihisa; Imayoshi, S.; Yoritsune, Tsutomu; Nunokawa, Hiroshi; Ochiai, Masa-aki; Ishizaka, Yuichi

doi:10.3327/jnst.38.557

Cited by 8 publications

(14 citation statements)

References 3 publications

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“…A CRDM that is located within the reactor vessel has been developed and patented by JAERI and MHI for the MRX [13,14] a small, pressurized-water, integral type reactor for nuclear propulsion of surface ships (see Figure 28). The rationale for the internal drive mechanism was to provide a compact design and to remove the possibility of rod ejection accidents, goals which are obviously of great importance in naval applications.…”

Section: Electromagnetically Driven Internal Crdmsmentioning

confidence: 99%

IRIS Final Technical Progress Report

Carelli¹

2003

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Section: Electromagnetically Driven Internal Crdmsmentioning

confidence: 99%

IRIS Final Technical Progress Report

Carelli¹

2003

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“…The original design and some of R&D were described in the interim report. 4) On the base of the original design, the final design with several improvements has completed recently, and its function was verified by tests with the full sized test assembly under condition of the high temperature and pressure water the same as that of MRX.…”

Section: ) Circumstance For Inv-crdm Workingmentioning

confidence: 99%

“…The maximum allowable current for the coil was designed as 13.4 A from the limitation of heat removal of the coil. This synchronous motor is controlled by a sensor-less open-circuit control scheme, 4) which does not need any sensor to detect the position of magnetic field and enable the system being very simple, although sufficient currents for standing the maximum required torque should be supplied always to the stator coil even at the rest of rotor. Rotational speed of the rotor can be controlled by an inverter through change of a power angle frequency.…”

Section: Design Of Driving Motormentioning

confidence: 99%

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Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor

Ishida

Imayoshi²,

Yoritsune

et al. 2001

Journal of Nuclear Science and Technology

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A highly reliable control rod drive mechanism (CRDM) installed inside the reactor vessel has developed for use of an advanced marine reactor. This CRDM contributes to compactness and simplicity of the reactor system, and it can eliminate the possibility of a rod ejection accident. The CRDM works in the high temperature and high pressure water-310 • C and 12 MPa, the same atmosphere as the primary loop. Driving force is produced by a synchronous motor with the rotor of a permanent magnet, which has been developed. An innovative latch mechanism using separable ball nuts can latch the driving shaft connecting the control rod and de-latch it for scram. The rod position detector using a magnetostrictive wire type sensor on the principle of Wiedeman effect has been developed, accuracy of which is verified to have a detecting error within 1.2 mm. Ball bearings for thrust and radial supports in rotation have been developed to be capable of working under the high temperature water for a long period. Under condition of high temperature water, the performance tests on latching, de-latching, holding and vertical movement, and durability test were conducted to verify the design conditions. This CRDM can be applied to not only the marine reactor, but also to light water reactors, PWR and BWR.

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“…Magnetostriction means deformation of ferromagnetic material due to the magnetostrictive strain from the applied magnetic field [3], and this can read multi-position at the same time. There are several information using a magnetostrictive type RPIS [4,5]; however, they do not provide the electrical limit signals. An Upper electrical Limit (UEL) and a Low Electrical Limit (LEL) signal provide the upper and lower driving limits of an ESA to assure the operating safety of the CRDM and the reactor.…”

Section: Introductionmentioning

confidence: 99%

Study on Rod Position Indication System using Permanent Magnets with Shielding Plates for a Control Rod Drive Mechanism

Lee¹,

Cho²,

Kim³

2015

Journal of Magnetics

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A control rod drive mechanism (CRDM) is an electromechanical equipment that provides linear movement for the control rods to control the nuclear reactivity in a nuclear reactor. A rod position indication system (RPIS) detects the control rod's position. To enhance the measurement accuracy of the system, a magnetostrictive type sensor with capability of generating operation limiting signals would be adapted instead of a conventional RPIS for a CRDM. An RPIS was modelled for a numerical analysis with the permanent magnets at the stationary limit positions and magnetic shielding plates with a moving permanent magnet. The performance analysis of the RPIS were conducted, and the results were discussed here.

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Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor.

Cited by 8 publications

References 3 publications

IRIS Final Technical Progress Report

IRIS Final Technical Progress Report

Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor

Study on Rod Position Indication System using Permanent Magnets with Shielding Plates for a Control Rod Drive Mechanism

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