ML112000528
| ML112000528 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/19/2011 |
| From: | - No Known Affiliation |
| To: | NRC Region 1 |
| McLaughlin M | |
| Shared Package | |
| ML112000510 | List: |
| References | |
| EA-11-047 | |
| Download: ML112000528 (5) | |
Text
Millstone Regulatory Conference Summary of Appendix M Attributes Protecting People and the Environment 1
Finding Details Multiple Examples of Procedural Violations and Inadequate Procedures Relating to Control Room Crew Performance During a Plant Protecting People and the Environment 2
g Transient Poor reactivity management Failure to carry out assigned roles and responsibilities
Appendix M Significance Defense in Depth Inappropriate reactivity control / Lack of caution related to unexpected plant responses:
Repeated operation of turbine controls when response not as expected Protecting People and the Environment 3
p p
Manually re-opening a turbine bypass valve that automatically closed Manually pulling control rods to raise RCS temperature On-going RCS dilution
Appendix M Significance Safety Margin Resetting the variable high power trip during unplanned power increase No procedure to provide guidance for VHT reset during unexpected plant transient Protecting People and the Environment 4
g p
p Untimely corrective action to provide written procedural guidance.
Repeated VHT reset actions were not communicated to control room team.
VHT resets performed by Reactivity SRO, who was assigned to supervise board manipulations.
Appendix M Significance Extent of Condition Extent of condition included other Unit 2 operating crews Post-event observations documented a number of instances of improper control room performance by Protecting People and the Environment 5
p p
p y
other crews (RCS dilution error)
Inconsistent application of control room standards (alarm response, panel walkdowns)