Reactor fuels

Each reactor reads its fuel values from a data map keyed by the fresh fuel item. A value only takes effect on an item of the reactor’s own fuel class: changing the numbers of HBM’s fuels works from a datapack, while a new fuel item needs an addon mod that registers it. The overview explains the file format.

Item ids inside values (pellet, hot, depleted, …) are plain id strings, resolved when the reactor needs them. Colours are "#RRGGBB" strings.

Reaction curves

PWR and Watz values use a curve object:

{ "type": "sqrt", "level": 25.0, "div": 1.0, "off": 0.0 }

Field	Type	Default	Meaning
`type`	string	required	`linear`, `sqrt`, `quadratic`, `log` or `passive`.
`level`	double	`0`	The curve’s strength.
`v_off`	double	`0`	`quadratic` only: vertical offset.
`div`	double	`1`	Divides the input.
`off`	double	`0`	Offsets the input.

rbmk_fuel

data/hbm/value_maps/item/rbmk_fuel.json. Registry: item. HBM ships 33 entries.

An RBMK fuel rod, from 1.7’s ItemRBMKRod setters.

Field	Type	Default	Meaning
`yield`	double	required	Total flux the rod can take in over its lifetime.
`reactivity`	double	required	The end point of the burn function.
`self_rate`	double	`0`	Flux the rod gives itself (self-igniting fuels).
`function`	string	`LOG_TEN`	Flux-to-reactivity curve: `PASSIVE`, `LOG_TEN`, `PLATEU`, `ARCH`, `SIGMOID`, `SQUARE_ROOT`, `LINEAR`, `QUADRATIC`, `EXPERIMENTAL`, or an addon mod’s.
`depletion`	string	`GENTLE_SLOPE`	How reactivity changes with depletion: `LINEAR`, `RAISING_SLOPE`, `BOOSTED_SLOPE`, `GENTLE_SLOPE`, `STATIC`, or an addon mod’s.
`xenon_gen`	double	`0.5`	Multiplier for xenon production.
`xenon_burn`	double	`50`	Divider for xenon burn-up.
`heat`	double	`1`	Heat produced per unit of outgoing flux.
`diffusion`	double	`0.02`	How fast the core heats the hull.
`melting_point`	double	`1000`	The highest hull temperature before the rod melts.
`heat_coeff_start`	double	`0`	Heat at which the heat coefficient starts acting.
`heat_coeff_length`	double	`0`	How far above that the coefficient brings the reaction to 0.
`neutron_in`	string	`SLOW`	The neutron type the rod fissions best with: `SLOW`, `FAST`, `ANY`.
`neutron_out`	string	`FAST`	The neutron type the rod releases.
`tint`	colour	`#304825`	The rod’s colour in the fuel channel.
`pellet`	item id	none	The pellet the rod is recycled into.

{
  "values": {
    "hbm:rbmk_fuel_ueu": {
      "yield": 100000000.0,
      "reactivity": 15.0,
      "depletion": "RAISING_SLOPE",
      "heat": 0.65,
      "melting_point": 2865.0,
      "tint": "#868D82",
      "pellet": "hbm:rbmk_pellet_ueu"
    }
  }
}

pwr_fuel

data/hbm/value_maps/item/pwr_fuel.json. Registry: item. HBM ships 15 entries.

A PWR fuel rod, keyed by the fresh rod.

Field	Type	Default	Meaning
`heat`	double	required	Heat per unit of flux.
`function`	curve	required	The reaction curve.
`yield`	double	`1000000000`	Flux one rod yields before it is spent.
`hot`	item id	required	The hot depleted rod it becomes.
`depleted`	item id	required	The cooled depleted rod.

{
  "values": {
    "hbm:pwr_fuel_meu": {
      "heat": 5.0,
      "function": { "type": "log", "level": 600.0, "div": 2500.0, "off": 1.0 },
      "hot": "hbm:pwr_fuel_hot_meu",
      "depleted": "hbm:pwr_fuel_depleted_meu"
    }
  }
}

zirnox_fuel

data/hbm/value_maps/item/zirnox_fuel.json. Registry: item. HBM ships 11 entries.

A ZIRNOX rod, keyed by the active rod.

Field	Type	Default	Meaning
`max_life`	integer	required	Life in operations.
`heat`	integer	required	Heat per operation.
`breeding`	boolean	`false`	A breeding rod only breeds: it adds no operations to its neighbours.
`base_radiation`	float	required	Radiation of the fresh rod.
`depleted_radiation`	float	required	Radiation of the spent rod.
`depletes_into`	item id	required	The item the rod becomes when used up.
`waste`	item id	none	The waste one used-up rod reprocesses into.

{
  "values": {
    "hbm:rod_zirnox_uranium_fuel": {
      "max_life": 200000,
      "heat": 50,
      "base_radiation": 0.5,
      "depleted_radiation": 150.0,
      "depletes_into": "hbm:rod_zirnox_depleted_uranium_fuel",
      "waste": "hbm:waste_uranium"
    },
    "hbm:rod_zirnox_th232_fuel": {
      "max_life": 20000,
      "heat": 0,
      "breeding": true,
      "base_radiation": 0.1,
      "depleted_radiation": 1.75,
      "depletes_into": "hbm:rod_zirnox_thorium_fuel"
    }
  }
}

watz_pellet

data/hbm/value_maps/item/watz_pellet.json. Registry: item. HBM ships 12 entries.

A Watz pellet, keyed by the fresh pellet.

Field	Type	Default	Meaning
`color`	colour	required	Bar colour.
`color_dark`	colour	required	The depleted pellet’s darker colour.
`passive`	double	`0`	Passive flux.
`heat`	double	`0`	Heat per unit of flux.
`mud`	double	required	Mud per unit of flux.
`burn`	curve	none	The reaction curve.
`heat_div`	curve	none	The heat divisor curve.
`absorb`	curve	none	The absorber curve.
`yield`	double	`500000000`	Flux before the pellet is depleted.
`depleted`	item id	required	The depleted pellet.

{
  "values": {
    "hbm:watz_pellet_schrabidium": {
      "color": "#32FFFF",
      "color_dark": "#005C5C",
      "passive": 2000.0,
      "heat": 20.0,
      "mud": 0.005,
      "burn": { "type": "linear", "level": 1.5 },
      "heat_div": { "type": "sqrt", "level": 0.1, "off": 100.0 },
      "depleted": "hbm:watz_pellet_depleted_schrabidium"
    }
  }
}

pile_rod

data/hbm/value_maps/item/pile_rod.json. Registry: item. HBM ships 9 entries.

A Chicago Pile rod. Every field is optional.

Field	Type	Default	Meaning
`reaction`	double	`0`	Fission multiplier.
`life`	double	`0`	Lifetime in absorbed neutrons.
`heat`	double	`0`	Heat per neutron.
`source`	double	`0`	Constant neutron source.
`turns_into`	item id	none	The item a spent rod becomes. Source rods have none.

{
  "values": {
    "hbm:pile_rod_mk2_ra226be": { "source": 1.0 },
    "hbm:pile_rod_mk2_nu": { "reaction": 1.0, "life": 25000.0, "heat": 0.25, "turns_into": "hbm:pile_rod_mk2_pu239" }
  }
}

rtg_pellet

data/hbm/value_maps/item/rtg_pellet.json. Registry: item. HBM ships 11 entries.

An RTG pellet. Output and radiation fall linearly with the life left, as in 1.7.

Field	Type	Default	Meaning
`heat`	integer	required	Heat output.
`heat_decaying`	integer	none	Heat when RTG decay is on in `hbm.cfg` (`9.01_doRTGsDecay`). Absent: `heat`.
`lifespan`	long	required	The pellet’s whole life in ticks.
`decays_to`	item id	required	The depleted pellet it becomes.

{
  "values": {
    "hbm:pellet_rtg_gold": {
      "heat": 100,
      "heat_decaying": 200,
      "lifespan": 194400,
      "decays_to": "hbm:pellet_rtg_depleted_mercury"
    }
  }
}

betavoltaic

data/hbm/value_maps/item/betavoltaic.json. Registry: item. HBM ships 10 entries.

Value: a long. A betavoltaic cell’s constant output in HE per tick.

{
  "values": {
    "hbm:battery_sc_waste": 150,
    "hbm:battery_sc_ra226": 200,
    "hbm:battery_sc_tc99": 500
  }
}

plate_fuel

data/hbm/value_maps/item/plate_fuel.json. Registry: item. HBM ships 7 entries.

A research reactor fuel plate.

Field	Type	Meaning
`life_time`	integer	Lifetime in reaction events.
`function`	string	The reaction curve: `LOGARITHM`, `SQUARE_ROOT`, `NEGATIVE_QUADRATIC`, `LINEAR`, `PASSIVE`.
`reactivity`	integer	Reactivity.

All three are required.

{
  "values": {
    "hbm:plate_fuel_u233": { "life_time": 2200000, "function": "SQUARE_ROOT", "reactivity": 50 }
  }
}

research_reactor_fuel

data/hbm/value_maps/item/research_reactor_fuel.json. Registry: item. HBM ships 7 entries.

What a spent research reactor plate becomes.

Field	Type	Default	Meaning
`output`	item id	required	The waste plate.
`hot`	boolean	`false`	Whether it comes out hot.

{
  "values": {
    "hbm:plate_fuel_u233": { "output": "hbm:waste_plate_u233", "hot": true }
  }
}

radgen_fuel

data/hbm/value_maps/item/radgen_fuel.json. Registry: item. HBM ships 2 entries.

A fuel for the radiation-powered generator.

Field	Type	Default	Meaning
`production`	integer	required	HE per tick.
`duration`	integer	required	Ticks it lasts.
`output`	item id	none	What is left over. Absent: nothing.
`count`	integer	`1`	How many of `output`.

The nuclear waste drums are handled by a rule in the machine (each waste becomes its depleted counterpart), not by this map.

{
  "values": {
    "hbm:scrap_nuclear": { "production": 50, "duration": 6000 },
    "hbm:gem_rad": { "production": 25000, "duration": 36000, "output": "minecraft:diamond" }
  }
}

icf_fuel

Two maps give the ICF pellet press its fuels. The value is an ICF fuel name: hydrogen, deuterium, tritium, helium3, helium4, lithium, beryllium, boron, carbon, oxygen, sodium, chlorine, calcium, or an addon mod’s.

By fluid

data/hbm/value_maps/fluid/icf_fuel.json. Registry: fluid. HBM ships 7 entries. The fuel a fluid presses into (1,000 mB per pellet half).

{
  "values": {
    "hbm:deuterium": "deuterium",
    "hbm:tritium": "tritium",
    "hbm:helium3": "helium3"
  }
}

By material

data/hbm/value_maps/material/icf_fuel.json. HBM ships 6 entries. Keyed by HBM material name, not by a registry entry, so tags do not apply. An item made of exactly one ingot of the material presses into the fuel.

{
  "values": {
    "beryllium": "beryllium",
    "boron": "boron",
    "calcium": "calcium",
    "graphite": "carbon",
    "lithium": "lithium",
    "sodium": "sodium"
  }
}