Generation What?

Below is a quick rundown of most of the reactors being marketed as of early 2011.  I'm using the term "marketed" somewhat loosely here, as not all reactors are being offered in all countries due to intellectual property rights, nationalism, or other considerations.  I have ignored a number of small reactor designs that I feel are just vaporware at this point.  The resulting list is dominated by large (2850 megawatts thermal) to very large (4590 MWt) pressurized water reactors.  The two small PWRs plus the nine others account for exactly half of the 22 models.

An oddity to note is that Westinghouse no longer markets a PWR derived from the ones it created in the 1960s due to a series of corporate mergers.  But the basic design lives on in the EPR, APWR, Amtea1 and CPR-1000 designs.  Westinghouse, which is 77% owned by Toshiba, now offers reactors derived from Combustion Engineering designs.  A minor point to note is that both GE-Hitachi and Toshiba are both marketing the ABWR.

By neutron speed, there are:

• 19 thermal reactors (150 to 4590 MWt)
• 3 fast reactors (30 to 2100 MWt)

By major type, there are:

• 13 pressurized water reactors (PWR; 150 to 4590 MWt)
• 4 boiling water reactors (BWR; 3370 to 4500 MWt)
• 2 sodium-cooled fast reactors (LMFR; 30 and 2100 MWt)
• 1 pressurized heavy water reactor (PHWR; 2080 MWt)
• 1 heavy water-moderated pressurized water reactor (HWPWR; 3200 MWt) *
• 1 lead-bismuth-cooled fast reactor (LMFR; 75 MWt)

By design family, there are:

• 4 Westinghouse (WH) pressurized water reactors
• 4 Combustion Engineering (CE) pressurized water reactors
• 4 GE boiling water reactors
• 3 VVER pressurized water reactors (Soviet/Russian PWRs evolved separately)
• 2 CANDU heavy water-moderated reactors
• 1 B&W pressurized water reactor (probably derived from US Navy designs, may be new)
• 1 KLT-series pressurized water reactor (evolution of Russian Navy designs)
• 1 BN-series sodium-cooled fast reactor (designed by a state-owned organization in Russia)
• 1 new lead-bismuth-cooled fast reactor (probably a clean sheet design, but may be derived)
• 1 new sodium-cooled fast reactor (probably a new design) 

By generation, there are:

• 12 "Generation III" designs (designs from the 1990s and 2000s with some passive safety features)
• 7 "Generation II+" designs (slight improvements over 1960s designs)
• 3 designs I haven't classified because I lack familiarity with them

The term "generation" was introduced by the DOE in order to simplify the presentation of its current strategy.  Right now it is pursing two goals: building evolved PWRs and BWRs (the Gen III models), and doing R&D on "Generation IV" reactors.  The marketing types have hijacked the nomenclature a bit, and have labeled some reactors "III+" as well as backfitted the "II+" designation on others.  I've ignored the III+ designation, but the II+ designation is not unreasonable because the designs have been worked on since they were first developed in the 1960s.

Reactor	Type	Gen.	MWt	MWe	Company	Family	Oper./ Const.
4S	sodium-cooled fast reactor	?	30	10	Toshiba Power Systems	new SFR	0/0
Power Module	lead-bismuth-cooled fast reactor	?	75	25	Hyperion Power Generation	new LFR	0/0
BN-800	sodium-cooled fast reactor	?	2100	800	Atomstroyexport	BN SFR	0/1
EC6	pressurized heavy water reactor	II+	2080	690	Atomic Energy Canada, LTD	CANDU	0/0
CPR-1000	pressurized water reactor	II+	3000	1000	China Guangdong Nuclear Power Group	ANP (WH) PWR	1/11
OPR-1000	pressurized water reactor	II+	2825	990	Doosan Heavy Industries & Construction	DHIC (CE) PWR	8/5
System 80+	pressurized water reactor	II+	3400	1120	Westinghouse (Toshiba)	CE PWR	0/0
VVER-1000	pressurized water reactor	II+	3000	950	Atomstroyexport	VVER PWR	2/5
VVER-1200	pressurized water reactor	II+	3200	1170	Atomstroyexport	VVER PWR	0/5
KLT-40S	pressurized water reactor	II+	150	35	OKBM/Atomstroyexport	SSSR PWR	0/2
ABWR	boiling water reactor	III	3900	1380	GE-Hitachi Nuclear Energy	GE BWR	3/2
ABWR	boiling water reactor	III	3900	1350	Toshiba Power Systems	GE BWR	2/0
ACR-1000	heavy water boiling water reactor	III	3200	1000	Atomic Energy Canada, LTD	CANDU	0/0
Atmea1	pressurized water reactor	III	3150	1150	Mitsubishi Heavy Industries-Areva NP	MHI/ANP (WH) PWR	0/0
AP1000	pressurized water reactor	III	3400	1120	Westinghouse (Toshiba)	CE PWR	0/5
APR1400	pressurized water reactor	III	4000	1350	Doosan Heavy Industries & Construction	DHIC (CE) PWR	0/4
APWR	pressurized water reactor	III	4450	1500	Mitsubishi Heavy Industries	MHI (WH) PWR	0/0
EPR	pressurized water reactor	III	4590	1630	Areva Nuclear Power	ANP (WH) PWR	0/4
ESBWR	boiling water reactor	III	4500	1600	GE-Hitachi Nuclear Energy	GE BWR	0/0
Kerena	boiling water reactor	III	3370	1250	Areva Nuclear Power	KWU (GE) BWR	0/0
MIR-1200	pressurized water reactor	III	3200	1170	Atomstroyexport/Skoda	VVER PWR	0/0
mPower	pressurized water reactor	III	400	125	Babcock & Wilcox	USN PWR?	0/0

* Added 2011/04/6: There's not a commonly accepted accepted acronym for the ACR-1000. Unlike the EC6 and older CANDU designs, the ACR-1000 uses heavy water only in the calandria, which is the vessel where the nuclear reactions take place. In the primary cooling loop it uses regular water, which generates steam in the secondary loop. To be consistent, older CANDU reactors would be HWPHWR and the ACR-1000 would be a HWPLWR. There have been similar heavy water reactors that boil light water in the primary cooling loop built.  They have been dubbed SGHWRs (steam generating heavy water reactors), which reverses the order of the coolant and moderator.