☢️ WIA-ENE-008 Nuclear Energy Standard
Phase 2 Specification
2. Phase 2: Advanced Safety and Performance
Phase 2 builds upon Phase 1 foundations with advanced safety features, enhanced performance requirements, and comprehensive accident management capabilities.
2.1 Advanced Safety Systems
2.1.1 Severe Accident Management
Phase 2 requires capabilities to prevent and mitigate severe accidents:
- Severe Accident Management Guidelines (SAMGs) for beyond-design-basis events
- Core damage prevention strategies (e.g., feed-and-bleed cooling)
- Containment protection systems (hydrogen recombiners, filtered venting)
- Instrumentation functional during severe accidents
- Emergency equipment (portable generators, pumps) stored onsite and at regional centers
2.1.2 Spent Fuel Pool Safety Enhancements
- Diverse methods for adding water to pools
- Reliable level indication during all conditions including station blackout
- Seismic analysis demonstrating pool integrity
- Time-to-boil analysis showing adequate response time
2.2 Performance Requirements
2.2.1 Core Damage Frequency (CDF)
Probabilistic risk assessment targets:
| Event Type | Target CDF |
|---|
| Internal events | <1×10⁻⁵ per reactor-year |
| Internal + external events | <1×10⁻⁴ per reactor-year |
| Large early release frequency (LERF) | <1×10⁻⁶ per reactor-year |
2.2.2 Operational Performance
- Capacity factor target: >90%
- Unplanned scrams: <1 per 7000 hours critical
- Safety system unavailability: <0.001 per demand
- Fuel reliability: <0.001% failed fuel
2.3 Enhanced Radiation Protection
2.3.1 ALARA Program Enhancements
- Collective dose targets and tracking
- Job-specific ALARA reviews for doses >100 person-mSv
- Design modifications to reduce doses in high-exposure areas
- Benchmarking against industry performance
2.3.2 Environmental Monitoring
- Continuous air monitoring at site boundary
- Surface and groundwater sampling (quarterly minimum)
- Food chain monitoring (milk, vegetation, fish)
- Thermoluminescent dosimeters (TLDs) at 40+ locations
- Annual radiological environmental operating report
2.4 Advanced Fuel Management
2.4.1 Extended Fuel Cycles
Requirements for cycles >18 months:
- Higher enrichment fuel (up to 5% U-235)
- Enhanced fuel assembly designs (debris filters, protective grids)
- Advanced core monitoring (in-core detectors, core exit thermocouples)
- Fuel performance analysis and burnup limits
2.4.2 Mixed Oxide (MOX) Fuel
If using MOX fuel:
- Plutonium content limits and isotopic specifications
- Core loading limits (typically <30% MOX assemblies)
- Enhanced neutron monitoring
- Specialized handling and storage procedures
2.5 Digital Instrumentation and Control
2.5.1 Digital I&C Requirements
- Software quality assurance per IEEE/IEC standards
- Independence between redundant divisions
- Diversity for safety-critical functions
- Cybersecurity protection (defense-in-depth, monitoring, incident response)
- Testing and validation including software verification
2.6 Emergency Preparedness Enhancements
2.6.1 Expanded EPZ Capabilities
- Dose projection capabilities using real-time meteorology
- Enhanced public notification systems
- Potassium iodide (KI) distribution programs
- Multi-unit coordination for sites with multiple reactors
- Beyond-design-basis event response capabilities
2.6.2 Exercise and Drill Requirements
- Biennial full-scale exercise with offsite agencies
- Annual medical emergency drill
- Quarterly control room emergency procedure drills
- Monthly fire drill
- Critiques and corrective actions for all exercises
2.7 Advanced Quality Programs
2.7.1 Corrective Action Program
- Condition reporting with low threshold
- Significance determination and prioritization
- Root cause analysis for significant issues
- Effectiveness review of corrective actions
- Trend analysis and proactive issue identification
2.7.2 Configuration Management
- Design basis document control
- Change control processes
- As-built configuration verification
- Design basis reconstitution if necessary
Phase 2 Achievements: Implementation of Phase 2 requirements significantly reduces risk beyond Phase 1 baseline, achieving world-class safety and operational performance.