{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"controlled_reentry__chemistry_materials","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"controlled_reentry__chemistry_materials__P1","proposal_index":1,"version":0,"title":"Feedback-Governed Monomer-Feed Reentry After a Polymerization Heat Excursion","problem":"In a jacket-cooled fed-batch polymerization, an abnormal temperature rise triggers automatic isolation of the monomer feed. Although cooling subsequently lowers the bulk temperature, residual radicals, delayed mixing, and uncertain heat-removal capacity can leave the reactor fragile. Restoring the normal monomer feed immediately can regenerate heat faster than the reactor can remove it and reproduce the excursion.","actors":["Control-room reactor operator","Process chemist responsible for the batch recipe","Process safety engineer","Automated feed-isolation and cooling system"],"observable_state":"The reactor is in a protected post-excursion state: monomer feed is isolated, agitation and cooling remain active, bulk temperature has returned below the trip point, but temperature slope, jacket duty, spatial temperature agreement, and estimated heat-generation-to-removal margin have not yet demonstrated stable response under renewed feed.","consequence":"A premature restart can cause another accelerating temperature rise, pressure escalation, off-specification polymer formation, emergency quenching, or loss of containment.","affected_objective":"Recover usable batch production while preserving thermal and pressure safety margins during the transition out of feed isolation.","intervention":"Replace immediate restoration of the recipe feed rate with a controlled reentry sequence. After independent confirmation that agitation, cooling, pressure protection, and temperature instrumentation are functional, admit a small, predefined monomer-feed recovery probe. Observe temperature slope, pressure slope, jacket response, and agreement among temperature sensors for a fixed window. Advance through bounded feed stages only when all stability criteria remain satisfied with protected cooling headroom; hold the stage when signals are ambiguous; automatically re-isolate feed and invoke the approved safe-state procedure when any rollback threshold is crossed. Require sustained stability across a hysteresis band before each expansion so transient cooling does not trigger rapid ramp-up.","structural_mapping":[{"archetype_element":"Protected or interrupted system","domain_realization":"A fed-batch polymerization reactor whose monomer feed was isolated after a thermal-excursion trip."},{"archetype_element":"Flow whose abrupt restoration could recreate failure","domain_realization":"Monomer feed, which can increase reaction heat generation and radical propagation when restored."},{"archetype_element":"Recovery probe","domain_realization":"A small, time-bounded monomer-feed increment admitted below the normal recipe rate."},{"archetype_element":"Observable recovery signals","domain_realization":"Temperature and pressure slopes, jacket heat-removal response, sensor agreement, and estimated cooling reserve during and after the probe."},{"archetype_element":"Admission control","domain_realization":"Interlocked feed-pump limits that permit only the authorized rate for the current reentry stage."},{"archetype_element":"Threshold and hysteresis","domain_realization":"Separate advance and rollback criteria, with sustained stable readings required before increasing feed."},{"archetype_element":"Rollback policy","domain_realization":"Automatic feed re-isolation followed by the site's approved cooling, venting, quench, or batch-disposition procedure."},{"archetype_element":"Preserved recovery headroom","domain_realization":"A required reserve between demonstrated heat-removal demand and the approved cooling-system limit at every stage."}],"mechanism_mapping":[{"mechanism_slug":"recovery_probe","role":"Tests whether the recovering reactor can accept a small amount of renewed reactant flow without reinitiating accelerating heat or pressure generation.","counterfactual_removal":"Without the probe, the first post-trip test would expose the reactor to a much larger fraction of normal reaction load."},{"mechanism_slug":"admission_control","role":"Physically bounds monomer flow to the currently authorized stage and prevents operator demand from becoming immediate full feed.","counterfactual_removal":"Without admission control, staged criteria would be advisory and an erroneous command or pressure to resume production could bypass the intended exposure bound."},{"mechanism_slug":"hysteresis","role":"Requires stability to persist inside a stricter advance region while using a separate retreat boundary, reducing oscillation caused by noisy or lagging thermal signals.","counterfactual_removal":"Without hysteresis, brief temperature improvements could repeatedly advance feed before the reactor's delayed response is visible."},{"mechanism_slug":"rollback_policy","role":"Converts adverse probe signals into immediate feed isolation and a predefined safe-state response.","counterfactual_removal":"Without rollback, a failed probe would become continued reactant addition during renewed instability rather than a reversible test."}],"causal_chain":["The initial excursion and feed trip leave uncertainty about residual reaction activity and effective heat-removal capacity.","Immediate normal-rate feeding would impose a large reaction-load step before that uncertainty is resolved.","A bounded recovery probe limits the added reactant inventory and associated heat-generation challenge.","Thermal, pressure, and cooling-response signals reveal whether the reactor remains stable under that challenge.","Explicit thresholds and hysteresis translate sustained observations into advance, hold, or rollback decisions.","Admission control prevents the next feed increment from exceeding the tested stage.","Repeating bounded tests expands feed only after evidence at lower stages while retaining cooling headroom.","If instability recurs, feed isolation limits further reactant addition and returns the reactor to its approved protected state."],"baseline":"Current restart practice is assumed for testing purposes to be a fixed cooldown followed by restoration of the standard startup or recipe feed rate once bulk temperature falls below a single restart threshold. That baseline uses elapsed time and a quiet bulk-temperature reading but does not test renewed reaction load in reversible stages.","nearest_rivals":["Static cooldown followed by restart: waits for a prescribed interval but does not use a load-bearing probe to demonstrate recovery.","Permanent reduced-rate feeding: lowers ongoing production intensity but does not govern the post-trip transition through evidence-based stages and rollback.","Simple retry of the normal startup sequence: repeats feed admission after a trip without changing the scale of the first exposure.","Discarding or quenching every tripped batch: avoids reentry but sacrifices any attempt to recover the batch.","Feedforward restart based on a kinetic model alone: predicts a safe rate but does not make expansion contingent on observed response to staged reintroduction."],"remaining_contrastive_claim":"The candidate's distinctive claim is that post-excursion feed restoration should be treated as a reversible sequence of bounded reaction-load tests, not merely as waiting, retrying, or operating indefinitely at a lower rate. Its defining structure is advancement or retreat based on observed reactor response while each stage preserves cooling headroom and a viable safe-state path.","authority_safety":{"decision_authority":"The site's designated process-safety authority and responsible process chemist approve the chemistry-specific thresholds and whether any live-material test may occur; the trained operator may execute only an approved protocol, while safety interlocks retain independent shutdown authority.","authorized_first_step":"Perform a documented bench-scale reaction-calorimetry study under an existing laboratory hazard assessment, using the smallest approved scale and containment, to compare a normal-rate restart with one predefined recovery-probe sequence after a simulated feed trip.","excluded_actions":["No trial on a production reactor based solely on this proposal.","No bypass, suppression, or widening of existing temperature, pressure, feed, venting, or cooling interlocks.","No operator-selected threshold changes during a run.","No reentry when agitation, cooling, relief protection, or required sensors are unavailable or disagree beyond approved limits.","No attempt to salvage a batch whose approved hazard analysis requires quench or disposal."],"halt_rollback":"At the first approved rollback condition—including excessive temperature slope, pressure slope, jacket saturation, loss of agitation, sensor disagreement, or inadequate cooling reserve—the feed remains or becomes isolated and the existing laboratory or plant safe-state procedure governs cooling, quench, venting, containment, and disposition. The protocol is abandoned if a reversible rollback cannot be demonstrated at the test scale."},"negative_tests":{"strongest_counterevidence":"Controlled small-feed probes could be misleading because delayed exothermic response or spatial hot spots may appear only after several stages, making early stability an unreliable indicator and potentially adding hazardous reactant inventory before failure becomes visible.","problem_falsifier":"The proposed problem framing is falsified if bounded calorimetry and validated heat-balance analysis show that, after the specified trip and recovery conditions, restart intensity does not materially affect recurrence of the thermal excursion, or that no observable protected state exists between mandatory batch termination and ordinary restart.","intervention_falsifier":"The intervention is falsified for this use if probe stages cannot produce timely, discriminating signals before hazardous accumulation; if safe rollback is not physically achievable after renewed feed; or if the staged protocol reaches equal or worse peak temperature, pressure, cooling-margin depletion, or sensor divergence than the approved baseline under matched initial conditions.","risks":["A probe may be too large for the actual residual-reactivity state.","Bulk sensors may miss a localized hot spot or poor mixing.","Reaction and measurement delays may make the observation window falsely reassuring.","Repeated sub-threshold probes may accumulate monomer or reactive intermediates.","Overly narrow thresholds may cause oscillatory advance and rollback.","Overly conservative thresholds may leave the batch indefinitely half-open and increase degradation or fouling.","Operators may treat successful laboratory stages as permission to override plant-specific hazard analysis.","Restart testing may expose laboratory personnel to pressure, toxic material, or runaway hazards.","A model-derived cooling reserve may be wrong if fouling or utility performance changed during the excursion."]},"next_evidence_step":"Under the responsible laboratory's existing authorization, run a small, shielded reaction-calorimetry matrix with matched post-trip initial states: at minimum, the approved baseline restart and one fixed staged-reentry protocol. Predefine probe size, observation window, advance and rollback thresholds, and protected cooling reserve. Record temperature and pressure slopes, heat-removal demand, sensor agreement, residual heat after feed isolation, and whether rollback arrests further acceleration. Stop after this bounded comparison; do not infer production-scale permission from the result.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals because runtime isolation prohibits inspecting them; this candidate is independently grounded in post-trip restoration of reactant flow in an exothermic materials-production process.","revision_record":{"parent_version":null,"progress_targets_addressed":[],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}