05000220/FIN-2012004-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | \\\"Inadequate Evaluation and Implementation of Design Modifications to the Turbine
Gland Seal Supply System |
| Description | A self-revealing Green finding (FIN) was identified for NMPNS failure to properly evaluate and implement plant design changes on the Unit 2 turbine gland seal steam supply system. Specifically, incorrect implementation of ECP-11-000977, Turbine Gland Seal and Exhaust System Instrument Changes, in May 2012 caused a reactor scram on July 13, 2012, following a return to full power operations from refueling outage N2RF13. NMPNS immediate corrective actions (CAs) included implementing ECP-12-000629 to revise the initiation setpoints for the emergency seal steam (ESS) system to accommodate higher gland seal operating pressures and properly gagging 2TME-RV135. NMPNS entered this issue into its corrective action program as CR 2012-006615. This finding is more than minor because it is similar to examples 5.a, 5.b and 5.c of IMC 0612 Appendix E, Examples of Minor Issues. In each example, plant modifications were installed and the system was returned to service without identifying and correcting a problem with the design change. This finding also adversely affects the design control attribute of the Initiating Events Cornerstone and affected the cornerstone objective of limiting the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The inspectors evaluated the finding using Attachment 0609.04, Initial Characterization of Findings, in Inspection Manual Chapter (IMC) 0609, Significance Determination Process. The finding was determined to be of low safety significance (Green) because while it did cause a reactor scram, it did not result in the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The finding has a cross-cutting aspect in the area of human performance in that NMPNS did not ensure that personnel and procedures were available and adequate to assure nuclear safety. Specifically, the procedures that were necessary to implement ECP-11-000977, by gagging relief valve 2TME-RV135, were not adequate to ensure proper installation of the gagging device. |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2012004 Section 1R18 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | L Scholl D Dempsey K Kolaczyk B Haagensen G Dentel J Krafty C Crisden B Dionne E Miller |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
| ' | |
Finding - Nine Mile Point - IR 05000220/2012004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Nine Mile Point) @ 2012Q3
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||