# 📐 L2 Spec — Decay Heat — residual power after reactor shutdown Mismatch-Only Spec
**ID:** `L2-363-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-363`](/artifact/l1/L1-363)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554107
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 0 – 40 |
| Fy error | — | 0.0 – 0.1 |
| N samples | — | 10 – 100000 |
| N nuclides | — | 10 – 3600 |
| T cooling s | s | 1 – 1000000000.0 |
| Decay data error | — | 0.0 – 0.05 |
| Irradiation history error | — | 0.0 – 0.1 |
## 2. Tolerance (ε)
**Type:** `fn`
```
19.0 + 0.3*SNR_dB - 30.0*fy_error - 40.0*decay_data_error - 20.0*irradiation_history_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`fa18ea5dde4dd2a3cb23984e49df07c67de6b65acfa7c7cd1561b9e632eb2a8e`
## 5. On-chain Registration
- **Chain hash:** `0x3375c8e90152eb17d358ad1ab92726d3e20105e71243ea6cc72b1fb667294058`
- **Chain tx hash:** `0x1508d01c597e86f6ff7852582e0808cd99a6a094e22a1b6fe5fa45c1b55e9f3f`
- **Chain block:** `41554107`
---
## File Mapping
This bundle consists of: `L2-363-001.md`, `L2-363-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-363-001.md` | Source of truth — edit this | Human or LLM |
| `L2-363-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-363-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._