Original engineering requirements and supplied inputs
Process demonstration — unvalidated engineering estimates. Assumptions, transferred estimates and unresolved requirements remain explicit. This readable view does not change the source evidence.
Source: User-provided Thomas Rambach posts in chat; original tweet URLs not supplied. These are supplied requirements, not measurements made during the study. Spring alloy and irradiation history were not specified in the original brief.
The original register records stiffness interpretation as unresolved. The later checkpoint A basis defines the supplied 50/20 N/mm values as effective single-spring stiffness for the demonstration. See the analysis basis for the adopted interpretation.
Supplied requirements
| Quantity | Value | Units | Origin |
|---|
| Bundle rows | 5 | count | Supplied |
| Bundle columns | 5 | count | Supplied |
| Parent assembly rows | 17 | count | Supplied |
| Parent assembly columns | 17 | count | Supplied |
| Midspan grid count | 1 | count | Supplied |
| Rod outside diameter | 9.5 | mm | Supplied |
| Rod pitch | 12.6 | mm | Supplied |
| Nominal wall-to-wall gap | 3.1 | mm | Supplied |
| Coolant pressure | 15.5 | MPa | Supplied |
| Coolant inlet temperature | 290 | degC | Supplied |
| Coolant mass flux | 3000 | kg/(m2 s) | Supplied |
| Bowed-rod linear heat rate | 25 | kW/m | Supplied |
| As fabricated support stiffness | 50 | N/mm | Supplied |
| Irradiated support stiffness | 20 | N/mm | Supplied |
| Maximum DNBR penalty | 5 | percent | Supplied |
Case definition and material
| Item | Definition or value |
|---|
| Material | Zircaloy-4 cladding; spring material unspecified |
| Gap closure percent | 50; 80; 100 |
| Added reference percent | 0 |
| Reference status | requested in accepted project goal |
| Stiffness interpretation | unresolved |
Source record and traceability
Download original machine-readable record
SHA-256: df196807b4b66afe59c35006cdd0671f54bb4506d6fdcf633dc8751da477468c
Presentation generated from this retained record. Historical status fields describe the source revision; later review decisions are explained on the engineering review page.