{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"failover__chemistry_materials","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"failover__chemistry_materials__P1","proposal_index":1,"version":0,"title":"State-Synchronized Failover for a Fouling Continuous Precipitation Reactor","problem":"A continuous materials-precursor precipitation process depends on one stirred reactor whose wall fouling, outlet restriction, or mixing degradation can shift pressure, residence time, supersaturation, and particle formation. Stopping the reactor for cleaning interrupts synthesis, while continuing to run can mix off-spec material into otherwise acceptable product.","actors":["Materials process scientist","Pilot-line operator","Process-control engineer","Quality-control analyst","Process safety supervisor"],"observable_state":"The primary reactor is considered degraded when a predeclared combination of measurements—such as sustained differential-pressure increase, agitator torque deviation, temperature or pH departure, and inline turbidity or particle-size drift—crosses its switching rule. The standby reactor's temperature, pH, liquid level, agitation, seed-solids concentration, valve state, and outlet destination are simultaneously visible in a readiness record.","consequence":"Without a prepared transfer path, operators must either stop and restart the synthesis or continue through an unhealthy reactor. The former interrupts precursor production and creates restart inventory; the latter can commingle material formed under uncontrolled residence-time or supersaturation conditions with the accepted product stream.","affected_objective":"Maintain a continuous, traceable stream of precursor formed within the declared process-state window while preserving mass balance, lot identity, containment, and unambiguous control of the active reactor.","intervention":"Install a separately isolatable secondary precipitation reactor and condition it before need to the same declared temperature, pH, agitation, liquid level, and seed-state window as the primary. A two-signal health rule authorizes switchover: incoming reagents are stopped briefly or diverted, the primary outlet and feed path are isolated, material already in transit is sent to a labeled quarantine vessel, and feeds are then admitted to the confirmed-ready secondary. A valve interlock permits only one reactor to discharge to the accepted-product header. The failed reactor remains isolated for inspection; return occurs only through a separate controlled-reentry procedure after reconciliation of inventory and quality records.","structural_mapping":[{"archetype_element":"Protected function","domain_realization":"Continuous precipitation of a materials precursor within a declared chemical and particle-state window."},{"archetype_element":"Vulnerable primary path","domain_realization":"The normally active stirred precipitation reactor, including its feed, mixing, residence-time, and product-discharge path."},{"archetype_element":"Observable primary failure or degradation","domain_realization":"Persistent pressure, torque, temperature, pH, turbidity, or particle-size evidence consistent with fouling, restriction, or loss of mixing control."},{"archetype_element":"Prepared alternate path","domain_realization":"A separately isolatable secondary reactor with adequate capacity, verified instruments, and preconditioned chemical state."},{"archetype_element":"State synchronization","domain_realization":"Alignment of temperature, pH, liquid level, agitation, seed-solids concentration, and outlet disposition before the secondary receives production feed."},{"archetype_element":"Switching rule and authority transfer","domain_realization":"A predeclared two-signal trigger followed by an interlocked valve sequence that assigns the feed and accepted-product path to exactly one reactor."},{"archetype_element":"Safe handling of in-flight work","domain_realization":"Material present during valve transition is collected in a uniquely identified quarantine vessel rather than accepted, duplicated, or silently discarded."},{"archetype_element":"Recovery policy and controlled reentry","domain_realization":"The primary is cleaned and tested offline; inventory and quality records are reconciled before any supervised return, with no automatic failback."}],"mechanism_mapping":[{"mechanism_slug":"primary_secondary_switchover","role":"Defines an active precipitation reactor and a prepared secondary that assumes the complete synthesis path only after primary degradation is confirmed.","counterfactual_removal":"With two reactors but no defined takeover sequence, the secondary is merely redundant equipment and continuity still depends on improvised operator actions."},{"mechanism_slug":"health_check","role":"Combines process and product-state signals to distinguish a reactor-path failure from a transient sensor excursion.","counterfactual_removal":"Without an explicit health check, switching may occur too late, from a viable primary, or for an upstream disturbance that the secondary cannot correct."},{"mechanism_slug":"state_synchronization","role":"Brings the standby reactor's thermal, compositional, hydrodynamic, and seed state into its readiness window before feed transfer.","counterfactual_removal":"A cold, chemically stale, or unseeded standby could accept flow yet produce an uncontrolled transition, defeating preservation of the protected function."},{"mechanism_slug":"standby_activation","role":"Transfers reagent feeds and the accepted-product outlet to the verified secondary while isolating the primary.","counterfactual_removal":"The alternate remains idle and cannot preserve synthesis continuity when the primary is isolated."},{"mechanism_slug":"controlled_reentry","role":"Keeps the repaired primary from automatically reclaiming the process until its condition and the intervening material history have been reconciled.","counterfactual_removal":"Immediate failback could create oscillation, dual ownership, cross-contamination, or conflicting lot histories."}],"causal_chain":["Reactor-local fouling, restriction, or mixing degradation makes the primary synthesis path unhealthy.","Independent process signals persist beyond the declared confirmation interval, making the degradation observable and auditable.","The control sequence verifies that the secondary reactor is within its synchronized readiness window.","Feeds and in-flight material are temporarily diverted so the transfer boundary has an explicit material disposition.","Interlocks isolate the primary before assigning feed and accepted-product authority to the secondary.","The secondary resumes the same protected precipitation function from a prepared chemical state rather than from a cold restart.","Transition material remains quarantined until quality review, preserving accepted-lot integrity.","The primary can be inspected and recovered offline, with any return governed by controlled reentry."],"baseline":"Stop reagent feeds when the primary becomes unhealthy, quarantine or drain its contents, clean and recondition that same reactor, restart it from an initial state, and hold restart material pending quality checks. A spare vessel may exist, but there is no synchronized readiness state, trigger, ownership-transfer sequence, or rehearsed handling of in-flight material.","nearest_rivals":["A spare reactor that is installed but cold, chemically unconditioned, and activated through an improvised restart rather than a defined takeover.","Ordinary parallel operation or load balancing, which continuously divides feed between reactors instead of transferring the protected function after degradation.","Graceful degradation by reducing feed rate, which retains the impaired primary path at lower throughput rather than replacing it.","A fail-safe shutdown that isolates feeds and leaves the process stopped until the primary is repaired.","Preventive antifouling coatings, cleaning schedules, or guard stages that reduce the chance of primary degradation but do not provide continuity after it occurs."],"remaining_contrastive_claim":"The candidate's distinguishing claim is structural: it couples a multi-signal reactor health decision to transfer of the entire stateful precipitation path into a chemically preconditioned secondary, with single-owner valve interlocks and explicit quarantine of transition inventory. Merely adding a spare vessel, splitting normal load, slowing the unhealthy reactor, or shutting down does not instantiate that combination.","authority_safety":{"decision_authority":"A trained process safety supervisor, acting with the pilot-line operator and under the approved experimental procedure, has authority to arm or authorize the test switchover; quality control alone decides whether quarantined material may be accepted.","authorized_first_step":"Conduct a bench-scale, non-production trial using an approved aqueous surrogate precipitation system in two jacketed reactors, with manually supervised switching, conservative pressure and temperature limits, and all output collected as experimental material.","excluded_actions":["Automatic failback to the recovered primary","Simultaneous connection of both reactors to the accepted-product header","Bypassing pressure, temperature, level, or valve-position interlocks","Releasing transition material without lot-specific quality review","Testing with production-scale quantities or unapproved reactive, toxic, pressurized, or pyrophoric chemistry","Using a secondary reactor whose readiness checks or containment inspection are incomplete"],"halt_rollback":"On conflicting valve indication, loss of containment, pressure or temperature limit breach, unexplained mass-balance error, failure of the secondary readiness check, or evidence that both reactors have feed authority, stop both feeds, route all outlets to quarantine, isolate the reactors, place them in the procedure-defined safe condition, and do not resume until the supervisor documents the fault."},"negative_tests":{"strongest_counterevidence":"The strongest counterevidence would be repeatable observation that matching the listed standby variables does not reproduce the primary's operative particle-forming state, so every switchover creates a transition as long or chemically uncontrolled as a stop-clean-restart.","problem_falsifier":"The problem framing is falsified if induced primary reactor degradation does not measurably interrupt output or move any declared process or product-state indicator outside its window, or if the observed drift originates in a shared upstream feed disturbance and persists unchanged in the secondary.","intervention_falsifier":"The intervention is falsified if, despite a correctly detected primary fault and a secondary that passed readiness checks, takeover cannot establish the declared process-state window within the predeclared quarantine interval, violates mass balance or single-reactor ownership, or produces no cleaner transition than the stop-and-restart baseline.","risks":["False failover caused by noisy or correlated sensors","A stale seed population or mismatched surface condition in the standby reactor","Split-path flow or cross-contamination from an incorrect valve state","Pressure accumulation during diversion or isolation","Loss, duplication, or mislabeling of in-flight material","A shared feed, utility, or control failure disabling both reactors","Secondary capacity exhaustion or fouling after takeover","Repeated switching caused by thresholds without hysteresis","Exposure during cleaning or sampling of the isolated primary","Failback that merges incompatible inventories or lot histories"]},"next_evidence_step":"Run a bounded six-trial bench study with an approved aqueous surrogate precipitation: three supervised failover trials and three stop-and-restart baseline trials. Precondition the secondary to declared temperature, pH, agitation, liquid level, and seed-state ranges; induce a reversible primary-path fault through an approved outlet restriction or controlled mixing degradation; and record trigger signals, valve ownership, pressure, temperature, pH, turbidity or particle-size proxy, mass balance, quarantine volume, and time until the declared state window is re-established. End the study after six trials without optimizing thresholds or escalating scale. The first decision is only whether synchronized switchover is operationally distinguishable from restart and safe enough to justify a separately reviewed follow-up.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed because runtime isolation prohibits inspection of other proposals; this candidate was generated solely from the supplied failover archetype and chemistry-and-materials domain card.","revision_record":{"parent_version":null,"progress_targets_addressed":[],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}