# HX-02B blind investigator handoff

**Study ID:** `HX02B-ZHANG-2022`  
**Status:** `BLOCKED_PENDING_INDEPENDENT_PROPERTY_RUNTIME`  
**Investigator:** `gpt-5.6-luna`  
**Fidelity selected by investigator:** `ANALYTICAL_ONLY`

The required Luna response was captured verbatim under the private execution record and hash-locked before any downstream work. Luna preserved unresolved quantities as `UNKNOWN/NOT_ESTABLISHED`, selected an analytical-only path, and excluded CFD, CHT, FEA, CFD-to-FEA coupling, and pressure-drop scoring under the current packet.

The operating point, idealized channel-bundle measurement planes, and parametric active-area convention are now explicit in a new pre-result continuation stage. The run remains stopped because this environment does not expose NIST REFPROP or an equivalent supercritical-CO₂ property runtime with a recorded version/hash and validity check. Substituting guessed constant properties would violate the blind handoff. No solver was dispatched, no experimental result was revealed, and no validation claim was made.

This is a property-runtime stop, not a solver failure. The next continuation requires an independently sourced, versioned property runtime; the Luna response and prior blind record remain immutable.

## What is retained

- Verbatim Luna response and SHA-256 manifest in the private execution record.
- Visible pre-run packet and reduced scored-observable contract.
- Access-control boundary check confirming the sealed reference was not opened before capture.
- Explicit plan mapping and stop report.

## Scope

The scored observables remain hot sodium outlet temperature, supercritical-CO₂ outlet temperature, two-side duty, energy closure, and overall U. Pressure-drop validation, predictive wall temperature, CHT material truth, FEA, CFD-to-FEA coupling, and structural validation remain excluded.

This page publishes the stop state only. It does not publish the sealed publication results or the private verbatim investigator artifact.