1. WO2026174400 - SMALL-SCALE NUCLEAR REACTOR

Publication Number WO/2026/174400

Publication Date 27.08.2026

International Application No. PCT/CA2026/050273

International Filing Date 20.02.2026

IPC

G21D 7/04 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
D	NUCLEAR POWER PLANT
7	Arrangements for direct production of electric energy from fusion or fission reactions
04	using thermoelectric elements

F28F 3/06 2006.1

F	MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
28	HEAT EXCHANGE IN GENERAL
F	DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
3	Plate-like or laminated elements; Assemblies of plate-like or laminated elements
02	Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
06	the means being attachable to the element

F28F 27/00 2006.1

F	MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
28	HEAT EXCHANGE IN GENERAL
F	DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
27	Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus

G21D 5/08 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
D	NUCLEAR POWER PLANT
5	Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
04	Reactor and engine not structurally combined
08	with engine working medium heated in a heat exchanger by the reactor coolant

G21C 7/06 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C	NUCLEAR REACTORS
7	Control of nuclear reaction
06	by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section

G21D 7/04 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
D	NUCLEAR POWER PLANT
7	Arrangements for direct production of electric energy from fusion or fission reactions
04	using thermoelectric elements

F28F 3/06 2006.1

F	MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
28	HEAT EXCHANGE IN GENERAL
F	DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
3	Plate-like or laminated elements; Assemblies of plate-like or laminated elements
02	Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
06	the means being attachable to the element

F28F 27/00 2006.1

F	MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
28	HEAT EXCHANGE IN GENERAL
F	DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
27	Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus

G21D 5/08 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
D	NUCLEAR POWER PLANT
5	Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
04	Reactor and engine not structurally combined
08	with engine working medium heated in a heat exchanger by the reactor coolant

G21C 7/06 2006.1

G	PHYSICS
21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
C	NUCLEAR REACTORS
7	Control of nuclear reaction
06	by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section

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Applicants

• CANADIAN STRATEGIC MISSIONS CORPORATION [CA]/[CA]

Inventors

• SAX, Daniel
• GRYFE, Adam
• ALAIN, Rebecca
• BOUDREAULT, Richard
• DONATO, Marc

Agents

• NORTON ROSE FULBRIGHT CANADA LLP

Priority Data

63/761,672

21.02.2025

US

Publication Language English (en)

Filing Language English (en)

Designated States

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AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CV, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IQ, IR, IS, IT, JM, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, MG, MK, MN, MU, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UY, UZ, VC, VN, WS, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, CV, GH, GM, KE, LR, LS, MU, MW, MZ, NA, RW, SC, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)

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Title

(EN) SMALL-SCALE NUCLEAR REACTOR

(FR) RÉACTEUR NUCLÉAIRE À PETITE ÉCHELLE

Abstract

(EN) A small-scale nuclear reactor includes a reactor core, a primary heat transport system, a thermoelectric conversion system, a heat sink disposed externally of the reactor core, and a control system. The primary heat transport system is configured to circulate a working fluid (e.g., water) in a primary loop through the reactor core. The thermoelectric conversion system and the heat sink are thermally coupled to the primary heat transport system through heat exchangers. The thermoelectric conversion system comprises an Organic Ranking Cycle generator and a secondary heat transport system. The secondary heat transport system is configured to circulate an organic refrigerant in a secondary loop through the Organic Ranking Cycle generator. The control system regulates power output of the Organic Ranking Cycle generator by synchronously adjusting flow rates of the working fluid in the primary loop and the organic refrigerant in the secondary loop.

(FR) La présente invention concerne un réacteur nucléaire à petite échelle qui comprend un cœur de réacteur, un système de transport de chaleur primaire, un système de conversion thermoélectrique, un dissipateur thermique disposé à l'extérieur du cœur de réacteur, et un système de commande. Le système de transport de chaleur primaire est configuré pour faire circuler un fluide de travail (par exemple, de l'eau) dans une boucle primaire à travers le cœur de réacteur. Le système de conversion thermoélectrique et le dissipateur thermique sont thermiquement couplés au système de transport de chaleur primaire par l'intermédiaire d'échangeurs de chaleur. Le système de conversion thermoélectrique comprend un générateur à cycle de Rankine organique et un système de transport de chaleur secondaire. Le système de transport de chaleur secondaire est configuré pour faire circuler un fluide frigorigène organique dans une boucle secondaire à travers le générateur à cycle de Rankine organique. Le système de commande régule la puissance de sortie du générateur à cycle de Rankine organique par l'ajustement synchrone des débits du fluide de travail dans la boucle primaire et du fluide frigorigène organique dans la boucle secondaire.

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