Nuclear Reactor ANS 5.1 Decay Heat Calculator

Reactor Safety & Thermal Hydraulics: Compute post-shutdown radioactive decay heat power ($P_d$), Way-Wigner approximations, ANS 5.1 multi-group models, and emergency cooling flow rates.

Reactor Operating History & Scram State

Nominal Thermal Power $P_0$ (MWth):

Full Power Burn Time $t_0$ (days):

Time Elapsed Post-Shutdown:

Time Unit:

ECCS $\Delta T_{\text{coolant}}$ Rise (°C):

Actinide / Capture Factor:

Post-Scram Decay Power & Cooling Demand

Decay Heat Power ($P_d$)

-- MWth

-- kW

Fraction of Full Power

-- %

Way-Wigner: -- %

Required ECCS Flow Rate

-- kg/s

-- GPM (US Gal/min)

Cumulative Heat Released (24h)

-- GJ

-- MWh thermal

Standard Decay Milestones ($P_0 = 3400\text{ MWth}$):

• At $t = 1\text{ s}$: ~6.5% – 7.0% (~230 MW)

• At $t = 1\text{ hour}$: ~1.4% (~47 MW)

• At $t = 1\text{ day}$: ~0.55% (~19 MW)

• At $t = 1\text{ month}$: ~0.15% (~5 MW)

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Nuclear Reactor ANS 5.1 Decay Heat Calculator

Reactor Operating History & Scram State

Post-Scram Decay Power & Cooling Demand

Frequently Asked Questions