Documentation Demonstrating Regulatory Compliance in the Radiological Consequence Analysis Schema

Table of Contents

1. Introduction
2. Schema Requirements Coverage
   1. Release Category to Radiological Consequence (RCRE)
   2. Atmospheric Transport and Dispersion (RCAD)
   3. Dosimetry (RCDO)
   4. Consequence Quantification (RCQ)
   5. Protective Action Parameters (RCPA)
   6. Meteorological Data (RCME)
3. Sample Implementation for EBR-II
4. Future Enhancements
5. Risk Integration
6. Configuration Control and Traceability

Introduction

This document provides evidence that the Radiological Consequence Analysis TypeScript schema satisfies the supporting requirements for documentation as specified in the standards. The schema has been designed to capture all necessary information for a comprehensive radiological consequence analysis, with specific consideration for the unique characteristics of different reactor types including sodium-cooled fast reactors like EBR-II.

The schema enables structured documentation of:

• Release category to radiological consequence transitions
• Atmospheric transport and dispersion modeling
• Dosimetry calculations
• Consequence quantification
• Protective action parameters
• Meteorological data

Schema Requirements Coverage

Release Category to Radiological Consequence (RCRE)

RCRE-C1 Coverage

Traceability Matrix for RCRE-C1

Schema Element	Notes
RadiologicalConsequenceDocumentation	Extends BaseProcessDocumentation with specific fields
RadiologicalConsequenceDocumentation.inputSources	Array of input sources
RadiologicalConsequenceDocumentation.appliedMethods	Array of methods used
RadiologicalConsequenceDocumentation.resultsSummary	Summary of analysis results
ReleaseCategoryInputs, ReleaseCharacteristics	Captures all required characteristics
ReleaseCategoryToConsequenceAnalysis.selectedConsequenceMeasures	Array of selected metrics
BoundingSite.boundingJustification	Justification for bounding site selection

Code Sample for RCRE Documentation

// Sample documentation for Release Category to Consequence Analysis
const releaseToConsequenceDoc = {
  inputSources: [
    "Source term data from Mechanistic Source Term Analysis for EBR-II",
    "EBR-II site meteorological data from 2020-2024",
    "Population distribution based on 2020 census data",
  ],
  appliedMethods: [
    "Sodium fire plume model for metallic fuel releases",
    "Gaussian plume dispersion modeling adapted for EBR-II site",
    "ICRP dosimetry methods with specific considerations for sodium activation products",
  ],
  resultsSummary:
    "Analysis indicates that all release categories for EBR-II meet the safety criteria with adequate margin.",
};

Atmospheric Transport and Dispersion (RCAD)

RCAD-F3 Coverage

Traceability Matrix for RCAD-F3

Schema Element	Notes
RadiologicalConsequenceDocumentation	General documentation structure
AtmosphericDispersionAnalysis.meteorologicalDataSpecification	Reference to meteorological data
AtmosphericDispersionAnalysis.dispersionModel	Model specification
AtmosphericDispersionAnalysis.plumeRiseConsideration	Plume rise considerations
AtmosphericDispersionAnalysis.buildingWakeEffectsConsideration	Building wake effects
AtmosphericDispersionAnalysis.terrainEffectsConsideration	Terrain effects
AtmosphericDispersionAnalysis.depositionModeling	Documentation of deposition modeling
AtmosphericDispersionAnalysis.modelLimitations	Model limitations and constraints
AtmosphericDispersionAnalysis.dispersionModelJustification	Justification for chosen model

Code Sample for RCAD Documentation

// Sample documentation for Atmospheric Transport and Dispersion
const atmosphericAnalysis: AtmosphericDispersionAnalysis = {
  dispersionModel: "Modified Gaussian Plume Model with sodium fire considerations",
  dispersionModelJustification:
    "Appropriate for modeling both gaseous radioactive releases and sodium fire aerosols relevant to EBR-II",
  plumeRiseConsideration:
    "Enhanced plume rise modeling for high-temperature sodium fires using modified Briggs' equations",
  buildingWakeEffectsConsideration:
    "Building wake effects modeled using the PRIME algorithm with adaptations for EBR-II facility geometry",
  terrainEffectsConsideration: "Terrain effects addressed using digital elevation model with 10m resolution",
  dispersionUncertainty: {
    sources: ["Wind direction variability", "Atmospheric stability classification", "Sodium fire plume behavior"],
    assumptions: ["Neutral stability conditions as baseline", "Complete combustion of sodium"],
    alternatives: ["Lagrangian particle dispersion model for complex terrain conditions"],
  },
  depositionModeling:
    "Dry and wet deposition modeled with special consideration for sodium aerosols and their hygroscopic properties",
  modelLimitations:
    "The modified Gaussian model assumes steady-state conditions which may not fully represent rapid changes during sodium fire events",
};

Dosimetry (RCDO)

RCDO-C1 and RCDO-C2 Coverage

Traceability Matrix for RCDO-C1 & RCDO-C2

Schema Element	Notes
RadiologicalConsequenceDocumentation	General documentation structure
DosimetryAnalysis.exposurePathways	Array of exposure pathways
DosimetryAnalysis.dcfSource	DCF source documentation
DosimetryAnalysis.shieldingConsiderations, DosimetryAnalysis.occupancyConsiderations	Shielding and occupancy factors
DosimetryAnalysis.dcfUncertainty	Uncertainty documentation
DosimetryAnalysis.dcfParameterUncertaintyCharacterisation	Detailed uncertainty characterization

Code Sample for RCDO Documentation

// Sample documentation for Dosimetry Analysis
const dosimetryAnalysis: DosimetryAnalysis = {
  exposurePathways: ["Inhalation", "Ground Shine", "Cloud Submersion", "Sodium activation product exposure"],
  dcfSource: "ICRP Publication 72 with specific considerations for sodium-22 and sodium-24",
  shieldingConsiderations:
    "Shielding factors account for EBR-II facility structures and typical residential buildings in the vicinity",
  occupancyConsiderations: "Time-dependent occupancy factors used for facility staff and nearby population",
  dcfUncertainty: {
    sources: [
      "Age-dependent variability",
      "Biokinetic model parameters",
      "Uncertainty in sodium activation product dosimetry",
    ],
    assumptions: [
      "Adult dose coefficients used as baseline",
      "Linear energy transfer effects for activated sodium isotopes",
    ],
    alternatives: ["Age-specific dose coefficients", "Site-specific biokinetic models"],
  },
  dcfParameterUncertaintyCharacterisation:
    "Log-normal distributions applied for DCF parameter uncertainties with increased geometric standard deviation for sodium activation products",
};

Consequence Quantification (RCQ)

RCQ-D1 Coverage

Traceability Matrix for RCQ-D1

Schema Element	Notes
RadiologicalConsequenceDocumentation	General documentation structure
ConsequenceQuantificationAnalysis.supportingDocumentationReferences	References to input documentation
ConsequenceQuantificationAnalysis.consequenceCodesUsed	Codes and models used
ConsequenceQuantificationAnalysis.eventSequenceConsequences	Results for each sequence
ConsequenceQuantificationAnalysis.consequenceCodesUsed	Documentation of codes
ConsequenceQuantificationAnalysis.selectedMetrics	Selected metrics
ConsequenceQuantificationAnalysis.uncertaintyCharacterization	Uncertainty characterization
ConsequenceQuantificationAnalysis.modelAndCodeLimitations	Limitations of models

Code Sample for RCQ Documentation

// Sample documentation for Consequence Quantification
const consequenceQuantification: ConsequenceQuantificationAnalysis = {
  selectedMetrics: ["Early Fatalities", "Latent Cancer Fatalities", "Thyroid Dose", "Sodium Exposure Effects"],
  consequenceCodesUsed: ["MACCS2 (modified for sodium coolant)", "NAFIRE (for sodium fire progression)"],
  modelAndCodeLimitations: [
    {
      code: "MACCS2",
      feature: "Atmospheric dispersion",
      limitation: "Standard implementation does not account for sodium fire thermal characteristics",
      justification: "Modified with custom plume rise and energy release models for sodium fires",
    },
    {
      feature: "Sodium aerosol deposition",
      limitation: "Simplified representation of complex chemical interactions",
      justification: "Conservative assumptions applied to bound potential consequences",
    },
  ],
  eventSequenceConsequences: [
    {
      eventSequenceFamily: "ESF-001", // LOSA scenario with primary boundary failure
      consequences: {
        "Early Fatalities": 0.02,
        "Latent Cancer Fatalities": 1.5,
        "Thyroid Dose": 0.15, // Sv
        "Sodium Exposure Effects": 0.01,
      },
      meanValue: 1.5e-7,
      uncertainty: "Log-normal distribution with GSD = 3.0",
    },
  ],
  uncertaintyCharacterization:
    "Monte Carlo analysis with 10,000 samples used to propagate uncertainties in source term, meteorology, and dosimetry parameters",
  supportingDocumentationReferences: [
    "Section 5: EBR-II Consequence Analysis Report",
    "Appendix B: Sodium Fire Model Validation",
  ],
  healthEffectsConsidered: {
    earlyEffects: ["Acute radiation syndrome", "Chemical burns from sodium exposure"],
    latentEffects: ["Cancer", "Hereditary effects"],
    doseResponseApproach: "Linear no-threshold model with additional considerations for sodium chemical toxicity",
  },
};

Protective Action Parameters (RCPA)

Traceability Matrix for RCPA Documentation

Schema Element	Notes
RadiologicalConsequenceDocumentation	General documentation structure
ProtectiveActionAnalysis.protectiveActionParameters	Parameters for protective actions
ProtectiveActionAnalysis.protectiveActionParameters	Detailed parameters
ProtectiveActionAnalysis.emergencyResponseTimingBases	Timing information
ProtectiveActionAnalysis.populationDistribution	Population data
ProtectiveActionAnalysis.landUseCharacteristics	Land use information
BoundingSite.characteristics	Plant physical information
ProtectiveActionAnalysis.protectiveActionUncertainty	Uncertainty documentation
RadiologicalConsequenceDocumentation.supportingDocumentationReferences	External references

Code Sample for RCPA Documentation

// Sample documentation for Protective Action Parameters
const protectiveActionAnalysis: ProtectiveActionAnalysis = {
  protectiveActionParameters: {
    evacuationDelay: "1.5 hours for general population",
    evacuationSpeed: "15 mph under normal conditions, 8 mph during adverse weather",
    shelteringEffectiveness: "60% reduction for gaseous releases, 80% for particulates",
    naOHProtection: "Distribution of NaOH solution for sodium decontamination at assembly points",
  },
  populationDistribution:
    "Population data from 2020 census with seasonal adjustments for recreational areas near EBR-II",
  landUseCharacteristics:
    "Mixed use with agricultural (70%), residential (15%), and industrial (15%) within 10-mile radius",
  emergencyResponseTimingBases:
    "EBR-II emergency response plan with specific provisions for sodium fire events and specialized response teams",
  protectiveActionUncertainty: {
    sources: [
      "Evacuation timing variability",
      "Shelter-in-place effectiveness for sodium aerosols",
      "Weather-dependent evacuation routes",
    ],
    assumptions: ["90% compliance with evacuation orders", "Availability of specialized sodium response equipment"],
    alternatives: ["Staged evacuation scenarios", "Enhanced sheltering with HEPA filtration"],
  },
  boundingWarningTimeAssumption:
    "Minimum warning time of 25 minutes based on automated detection systems for sodium leaks and fires",
};

Meteorological Data (RCME)

Traceability Matrix for RCME Documentation

Schema Element	Notes
RadiologicalConsequenceDocumentation	General documentation structure
MeteorologicalDataAnalysis.meteorologicalDataSetDescription	Description of data source
Should be included in documentation	Partially covered
Should be included in description	Partially covered
Should be included in description	Partially covered
Should be included in description	Partially covered
MeteorologicalDataAnalysis.meteorologicalDataSetDescription	Time period information
Should be included in description	Partially covered
MeteorologicalDataAnalysis.parameterUncertaintyCharacterisation	Uncertainty characterization

Code Sample for RCME Documentation

// Sample documentation for Meteorological Data
const meteorologicalData: MeteorologicalDataAnalysis = {
  parameterUncertaintyCharacterisation:
    "Wind direction uncertainty modeled with von Mises distribution; wind speed with Weibull distribution calibrated to site data",
  meteorologicalDataSetDescription:
    "Five years (2020-2024) of hourly meteorological data from the on-site 60m tower at EBR-II. Data includes wind speed and direction at 10m and 60m heights, temperature at 2m and 60m, precipitation, and stability class. Quality assessment performed quarterly with 98.7% data recovery.",
  meteorologicalFrequencyDistributionTreatment:
    "Stratified random sampling approach used to select 120 representative weather sequences based on seasonal and diurnal patterns",
  temporalChangesAccommodation:
    "Hourly meteorological data used to capture diurnal variations in wind patterns and stability conditions relevant to EBR-II site",
  timeResolution: "Hourly",
};

Sample Implementation for EBR-II

Below is a simplified sample implementation for the EBR-II reactor, focusing on its unique characteristics:

// Sample RadiologicalConsequenceAnalysis implementation for EBR-II
const ebrIIConsequenceAnalysis: RadiologicalConsequenceAnalysis = {
  "technical-element-type": TechnicalElementTypes.CONSEQUENCE_ANALYSIS,
  "technical-element-code": "RC",
  metadata: {
    version: "1.0",
    analysis_date: "2025-03-15",
    analyst: "Dr. Jane Smith",
    scopeDefinition: {
      isSpecificSite: true,
      siteReference: "SITE-EBR2",
      consequenceMetrics: ["Individual Early Fatality Risk", "Population Latent Cancer Risk", "Sodium Exposure Risk"],
      protectiveActionsModellingDegree: "Detailed modeling including specialized response for sodium fires",
      meteorologyModellingDegree: "Site-specific meteorological data with enhanced turbulence measurements",
      atmosphericDispersionModellingDegree: "Modified Gaussian plume model with sodium fire plume rise parameters",
      dosimetryModellingDegree: "Detailed dose calculations including activated sodium isotopes",
      healthEffectsModellingDegree: "Combined radiological and chemical effects modeling",
      economicFactorsModellingDegree: "Assessment including sodium cleanup costs",
    },
  },

  // Release Category Analysis specifically considering sodium coolant aspects
  releaseCategoryToConsequence: {
    siteInformation: {
      isBounding: false,
      siteReference: "SITE-EBR2",
    },
    releaseCategoryInputs: [
      {
        releaseCategory: "RCAT-001", // Loss of Sodium Accident (LOSA)
        releaseCharacteristics: {
          numberOfPlumes: 2, // Initial release and delayed sodium fire
          radionuclideGroupFractions: {
            NobleGases: 0.95,
            Iodines: 0.4,
            ActivatedSodium: 0.85,
          },
          importantRadionuclides: ["Na-22", "Na-24", "Cs-137", "I-131", "Kr-85"],
          importantRadionuclidesJustification:
            "Na-22 and Na-24 are significant due to sodium coolant activation; Cs-137 and I-131 from metallic fuel; Kr-85 from gap release",
          releaseTiming: "0 hour initial, 2 hour sodium fire",
          releaseDuration: "1 hour initial, 8 hours sodium fire",
          warningTime: 0.4,
          warningTimeDescription: "24 minutes based on leak detection system",
          releaseEnergy: 3.5e9, // Higher due to sodium fire
          releaseEnergyDescription: "High - exothermic sodium fire",
          releaseHeight: 45, // Elevated due to buoyant plume
          releaseHeightDescription: "Elevated due to sodium fire thermal buoyancy",
        },
      },
    ],
    releaseCategoryAndSourceTermReviewed: true,
    selectedConsequenceMeasures: [
      "Individual Early Fatality Risk",
      "Population Latent Cancer Risk",
      "Sodium Exposure Risk",
    ],
    releaseCategoryLinkageDocumentation: "See Section 4.2 of EBR-II PRA for event sequence mapping",
  },

  // Other required elements would follow, each with EBR-II specific considerations
  atmosphericTransportAndDispersion: {
    /* EBR-II specific details */
  },
  dosimetry: {
    /* EBR-II specific details */
  },
  consequenceQuantification: {
    /* EBR-II specific details */
  },
  protectiveActionParameters: {
    /* EBR-II specific details */
  },
  meteorologicalData: {
    /* EBR-II specific details */
  },
};

This implementation highlights several key EBR-II characteristics:

1. Sodium coolant activation products (Na-22, Na-24) as important radionuclides
2. Multiple plume phases including the initial release and subsequent sodium fire
3. Higher release energy due to exothermic sodium-air reactions
4. Specialized protective actions for sodium exposure
5. Modified dispersion modeling for sodium fire plumes
6. Combined radiological and chemical effects in the health impact assessment

Future Enhancements

While the current schema provides comprehensive coverage of the documentation requirements, several areas could be enhanced in future versions:

1. Meteorological Data Documentation - The schema could be extended to include more explicit fields for quality assessment, sensor levels, tower exposure, calibration records, and data recovery metrics to fully satisfy all RCME documentation requirements.

2. Specialized Reactor Type Extensions - Create dedicated extensions for sodium-cooled reactors like EBR-II, including specific fields for sodium fire modeling, activated coolant considerations, and metal fuel behavior.

3. Integration with Visualization Tools - Add schema elements to support direct integration with visualization and reporting tools for more effective communication of results.

4. Time-Dependent Protective Actions - Enhance the schema to better capture the evolution of protective actions through different phases of an incident, with more structured timing information.

5. Enhanced Uncertainty Representation - Develop more detailed structures for representing uncertainty distributions, correlation between parameters, and sensitivity analysis results.

6. Validation Record Integration - Add structures to document model validation studies, including comparisons with experimental data particularly for specialized phenomena like sodium fires.

7. Cross-References to Source Term Analysis - Strengthen the connections between radiological consequence analysis and upstream mechanistic source term analysis, particularly for non-LWR technologies.

Risk Integration

The schema includes comprehensive support for risk integration through several enhanced interfaces:

1. Enhanced ConsequenceQuantificationAnalysis:

export interface ConsequenceQuantificationAnalysis {
  // ... existing fields ...

  /**
   * Mapping between consequence metrics and risk metrics used in risk integration.
   */
  riskMetricMapping?: {
    consequenceMetric: string;
    riskMetric: RiskMetricType | string;
    mappingDescription: string;
    transformations?: string;
  }[];

  /**
   * Feedback received from risk integration.
   */
  riskIntegrationFeedback?: {
    analysisId: string;
    feedbackDate?: string;
    metricFeedback?: {
      metric: string;
      riskSignificance?: ImportanceLevel;
      insights?: string[];
      recommendations?: string[];
    }[];
    generalFeedback?: string;
    response?: {
      description: string;
      changes?: string[];
      status: "PENDING" | "IN_PROGRESS" | "COMPLETED";
    };
  };
}

2. Enhanced RadiologicalConsequenceDocumentation:

export interface RadiologicalConsequenceDocumentation extends BaseProcessDocumentation {
  // ... existing fields ...

  /**
   * Documentation of the integration with risk integration.
   */
  riskIntegrationDocumentation?: {
    integrationProcessDescription: string;
    consequenceMetricUsage: {
      metricName: string;
      correspondingRiskMetric?: RiskMetricType;
      usageDescription: string;
    }[];
    uncertaintyPropagation?: string;
    integrationChallenges?: string[];
    inconsistencyResolution?: string;
    feedbackReceived?: {
      source: string;
      date?: string;
      description: string;
      significance: ImportanceLevel;
    }[];
    feedbackIncorporation?: {
      feedbackReference: string;
      incorporationDescription: string;
      status: "PENDING" | "IN_PROGRESS" | "COMPLETED";
      date?: string;
    }[];
    keyInsights?: string[];
    riskIntegrationReferences?: {
      analysisId: string;
      version?: string;
      date?: string;
      usageDescription: string;
    }[];
  };
}

3. Enhanced ReleaseCategoryToConsequenceAnalysis:

export interface ReleaseCategoryToConsequenceAnalysis {
  // ... existing fields ...

  /**
   * Mapping between release categories and risk metrics used in risk integration.
   */
  riskMetricMapping?: {
    releaseCategory: ReleaseCategoryReference;
    riskMetrics: {
      riskMetric: RiskMetricType | string;
      contributionDescription: string;
      significance?: ImportanceLevel;
    }[];
  }[];

  /**
   * Risk significance criteria used to evaluate release categories.
   */
  riskSignificanceCriteria?: {
    criteriaType: RiskSignificanceCriteriaType | string;
    description: string;
    thresholds?: {
      level: ImportanceLevel;
      value: number;
      units?: string;
    }[];
  }[];
}

4. Enhanced ProtectiveActionAnalysis:

export interface ProtectiveActionAnalysis {
  // ... existing fields ...

  /**
   * Impact of protective actions on risk metrics.
   */
  riskMetricImpact?: {
    riskMetric: RiskMetricType | string;
    impactDescription: string;
    quantitativeAssessment?: string;
    uncertaintyDescription?: string;
  }[];

  /**
   * Sensitivity of risk metrics to protective action parameters.
   */
  riskMetricSensitivity?: {
    parameter: string;
    affectedRiskMetrics: (RiskMetricType | string)[];
    sensitivityDescription: string;
    importance?: ImportanceLevel;
  }[];
}

5. Enhanced MeteorologicalDataAnalysis:

export interface MeteorologicalDataAnalysis {
  // ... existing fields ...

  /**
   * Description of how temporal changes in meteorological conditions are accommodated.
   */
  temporalChangesAccommodation?: string;

  /**
   * Time resolution of meteorological data.
   */
  timeResolution?: string;
}

6. Enhanced AtmosphericDispersionAnalysis:

export interface AtmosphericDispersionAnalysis {
  // ... existing fields ...

  /**
   * Description of deposition modeling for radionuclide particles.
   */
  depositionModeling?: string;

  /**
   * Dry deposition parameters.
   */
  dryDepositionParameters?: {
    depositionVelocities?: Record<string, number>;
    particleSizeDistribution?: string;
  };

  /**
   * Wet deposition parameters.
   */
  wetDepositionParameters?: {
    washoutCoefficients?: Record<string, number>;
    precipitationData?: string;
  };
}

These enhancements provide comprehensive support for:

• Mapping between consequence metrics and risk metrics
• Documentation of risk integration feedback and responses
• Tracking of risk significance and criteria
• Assessment of protective action impacts on risk metrics
• Enhanced meteorological and atmospheric dispersion modeling
• Improved traceability between technical elements

Configuration Control and Traceability

The schema includes structures for documenting configuration control and traceability, including:

1. Version Control - RadiologicalConsequenceAnalysis.metadata.version
2. Analysis Date - RadiologicalConsequenceAnalysis.metadata.analysis_date
3. Analyst Information - RadiologicalConsequenceAnalysis.metadata.analyst
4. Scope Definition - RadiologicalConsequenceAnalysis.metadata.scopeDefinition
5. Documentation References - RadiologicalConsequenceDocumentation.supportingDocumentationReferences

These structures ensure that all documentation is traceable to the specific analysis context and the responsible analyst.