286 Pages of Candor, and Still No Assembled u_D — SHIIVER, the Best-Documented Cryogenic Tank Test I Have Read, and What a Modeler Still Cannot Reconstruct From It

Technical Note 002 in the ElarionX CPMS series. Between August 2019 and January 2020 NASA tested SHIIVER - the Structural Heat Intercept, Insulation, and Vibration Evaluation Rig - a 4-metre stainless steel cryogenic tank, at Glenn Research Center's Plum Brook Station. Its final report, NASA/TP-20205008233, runs 286 pages. This note reads it against the six referent-quality criteria of the series and finds it the counter-case to Technical Note 001: a test whose documentation posture is close to exemplary. Six practices are named. Required measurement uncertainties were fixed in a separately published 53-page test plan before the test ran, sensor by sensor, with the reason for each. The analysis property basis is explicit: parahydrogen and nitrogen properties are tabulated with references, so a modeler does not have to guess which hydrogen the analysis assumed (the spin composition of the fluid actually loaded remains a separate, unstated matter). Measurements were redundant, by dissimilar principles where available, and the report plots the methods against each other and narrates where they disagree. Assumptions are marked as assumptions - the boiloff analysis anchors on the seven words "(it is assumed that FM3 is accurate)". A roughly 50 percent uncertainty on the heat flux sensors at liquid hydrogen temperature is published rather than hidden, with the argument that values and trends still match well with other calculation methods. And yet the title stands: what SHIIVER does not publish is an assembled result-level experimental uncertainty. Uncertainty appears as requirements, per-instrument accuracies and candid asides - the report even quantifies method-to-method root-sum-square dispersion of 7 to 60 percent on heat fluxes and loads - but no instrument-propagated budget is attached to a headline result. The negative was re-verified over the corrected universe of all 74 numbered tables and the full report text. Criterion six is measured here for the first time: the first full-length downstream validation paper (Kartuzova, Kassemi and Hauser, AIAA SciTech 2023, NTRS 20220017916) was obtained, hashed and audited against SHIIVER's own published qualifications. None of them travelled into it, and its headline - tank pressures within 4 percent of experiment - carries no experimental uncertainty against which 4 percent could be judged. One referent later, this is the same shape Note 001 measured across the K-Site lineage. Scope and limitations. Exploratory (A0) work by one auditor with AI assistance and no independent human review; one downstream paper is one paper, and the wider SHIIVER literature remains unsurveyed. Defects found after writing, including by externally commissioned review, are recorded in the errata table of Technical Note 000 (Errata 14-17). Full audit records are published as a separate dataset; the series index is Technical Note 000.