//NRDP
Cross sections, materials, and reactor data for MCNP, OpenMC, Serpent, and SCONE.
Tools
ALLEN
Cross-Section Explorer
Interactive log-log σ(E) plots from ENDF/B-VIII.0 and JEFF-3.3. Doppler Studio, library comparison, deep-linkable teaching views.
OpenMaterials
Curated + PNNL Compendium
Pre-built reactor materials with copy-paste MCNP, OpenMC, Serpent, and SCONE cards. Full PNNL-15870 compendium (411 materials).
OpenReactor Analysis
Parameter Similarity Finder
Filter 50+ documented reactors by class, power, and coolant. Rank designs against your target parameters with weighted similarity.
OpenPeriodic Table
Elements & ZAIDs
Interactive periodic table — click any element for isotopes, cross-section library suffixes, and ZAID identifiers.
OpenLibrary Reference
Suffix Guide
Comprehensive table of .80c, .71c, .20t suffixes with library names, temperatures, and when to use each data type.
OpenCalculators
Engineering Tools
Atom ↔ weight fractions, number density, MCNP density sign helper, k_eff ↔ reactivity, and macroscopic Σ with mean free path.
Open