ML051530478
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| ML051530478 | |
| Person / Time | |
|---|---|
| Site: | Millstone  (NPF-049) |
| Issue date: | 05/18/2005 |
| From: | NRC Region 1 |
| To: | |
| Krohn P, RI/DRP/PB6/610-337-5120 | |
| Shared Package | |
| ML051240334 | List: |
| References | |
| Download: ML051530478 (15) | |
Text
Millstone Unit 3 Special Inspection April 17, 2005, Reactor Trip and Safety Injection Nuclear Regulatory Commission-Region I King of Prussia, PA NEAC Meeting May 18, 2005
2 NRC Presentation
- NRC Introductions
- Special Inspection Team and Charter
- Event Chronology
- Event Overview and Analysis
- Special Inspection Results
- Discussion
3 NRC Representatives
- Brian E. Holian, Acting Director, Division of Reactor Projects
- Marvin D. Sykes, Chief, Engineering Branch 1, Team Manager
- G. Scott Barber, Senior Project Engineer, Team Leader
- Don Jackson, Senior Project Engineer
- Ronald Nimitz, Senior Health Physicist
- Thomas Sicola, Reactor Inspector
- S. Max Schneider, Senior Resident Inspector
- Nicole Sieller, Reactor Engineer
- Peter Presby, Reactor Inspector
4 Special Inspection Team (SIT)
- Team Staffing 3/4Four full time members 3/4Four part time members 3/4Multidisciplined group with diverse backgrounds
5 Special Inspection Team (SIT)
- Charter / Objectives 3/4Chronology of event 3/4Apparent cause(s) 3/4System response(s) 3/4Equipment deficiencies including maintenance and surveillance history 3/4Evaluation of licensee follow-up actions 3/4Radiological Assessment
6 Event Chronology
- Low steam line pressure signal reactor trip
- Single train safety injection and main steam line isolation
- Main steam safety valve and atmospheric relief valve opening
- Turbine driven auxiliary feedwater pump trip and restart
- Primary power operated relief valve cycling
- Alert declared
- Operator actions to stabilize plant conditions
- Plant shutdown and cooldown
7 Event Overview
- Initial response prompt
- Emergency response organizations activated -
Dominion and NRC
- Some operational / equipment challenges occurred while stabilizing plant conditions
- Licensee successful in achieving cold shutdown
- No consequences to public health and safety
8 Event Analysis
- Dominion Actions 3/4Event Review Team activities initiated 3/4Apparent cause promptly identified by I&C -
Tin Whisker 3/4Timely assessment of radiological conditions 3/4Multiple corrective actions implemented (cause / equipment related) 3/4Additional evaluations initiated
9
10 Millimeters
11 NRC Special Inspection Team Results
- Preliminary Findings 3/4Turbine Driven Auxiliary Feedwater Pump 3/4Emergency Operating Procedure Implementation Issues 3/4Assessment of Plant Conditions 3/4Simulator Fidelity 3/4Indicator Design Issues 3/4Boric Acid Control Program 3/4Emergency Response Data System Activation 3/4Thoroughness of Event Review Effort
12 NRC Special Inspection Team Results
- Unresolved items 3/4Pressurizer snubber - potential inoperability 3/4Charging system issues 3/4Simulator issues 3/4Root Cause Evaluations
13 NRC Special Inspection Team Results
- Observations 3/4Thoroughness of Event Review Effort 3/4Emergency Operating Procedure Documentation and Usage 3/4Extent of Condition Review for Non-Solid State Protection System Cards
14 Radiological Assessment
- Radiological release - well below Regulatory Limits
- No consequence to health or safety of public
- Worker doses were appropriately controlled
15 Conclusions
- Event 3/4Unit was safely shutdown by operators and placed in a stable condition 3/4Radiological release well below regulatory limits 3/4No consequences to public health and safety