Safety Analysis Dashboard

Comprehensive nuclear safety assessment and monitoring

SAFE

All safety parameters within acceptable limits

Last Analysis

Jan 27, 2025 14:55

SIM-2025-001246

k-effective

NOMINAL
1.00024 ±0.00005
Target 1.000 ± 0.005
Deviation +24 pcm

Doppler Coefficient

NEGATIVE

-0.92

pcm/K

-2.0 Required: < 0 0

Void Coefficient

NEGATIVE

-450

pcm

-800 Required: < 0 0

β-effective

NOMINAL

345

pcm

200 Typical: 300-400 pcm 500

Safety Limits Assessment

Peak Power Factor
PASS
1.42 / 2.0 limit

29% margin to operational limit

Max Fuel Temperature
PASS
1650 °C / 2800°C limit

41% margin to fuel melting point

Max Clad Temperature
PASS
550 °C / 650°C limit

15% margin to clad integrity limit

Coolant Velocity
PASS
1.8 m/s / 3.0 m/s limit

40% margin to erosion limit

Reactivity Balance

Total Reactivity

+24 pcm

Control Rod Worth

-2,450 pcm

Shutdown Margin

-1,850 pcm

Required Margin

-500 pcm

Design Basis Accident Analysis

ULOF

Unprotected Loss of Flow

SAFE
Max Fuel T 2150°C
Max Clad T 720°C
Peak Power 1.15
Time to Safety 45s

UTOP

Unprotected Transient Overpower

MARGINAL
Max Fuel T 2650°C
Max Clad T 640°C
Peak Power 1.82
Time to Safety 120s

ULOHS

Unprotected Loss of Heat Sink

SAFE
Max Fuel T 1950°C
Max Clad T 610°C
Peak Power 1.05
Time to Safety 180s

Complete Reactivity Coefficients

Coefficient Value Unit Limit Status Uncertainty Notes
Doppler (fuel) -0.92 pcm/K < 0 PASS ±5% Inherently negative
Coolant void -450 pcm < 0 PASS ±10% Lead coolant benefits
Axial expansion -0.35 pcm/K < 0 PASS ±8% Negative feedback
Radial expansion -0.28 pcm/K < 0 PASS ±12% Core diagrid expansion
Coolant density -0.18 pcm/K < 0 PASS ±6% Lead thermal expansion
β-effective 345 pcm 300-400 PASS ±3% Delayed neutron fraction
Prompt lifetime 4.2e-7 s - INFO ±5% Fast spectrum

AI Safety Recommendations

GPT-4 Analysis

Inherently Safe Design

All reactivity coefficients are negative, ensuring passive safety. The Doppler coefficient of -0.92 pcm/K provides strong negative feedback during temperature excursions.

UTOP Analysis Attention

The UTOP scenario shows marginal fuel temperature (2650°C). Consider additional control rod worth or reducing reactivity insertion rate to improve margin.

Optimization Suggestion

Adjust control rod position by 2-3 cm to reduce k-eff margin from +24 pcm to target +15 pcm, maintaining comfortable operating margin.

Validation Reference

Results align with ALFRED reference design within 2.1% for k-eff and 5% for reactivity coefficients. Consistent with EXP-042 experimental validation.