05000336/FIN-2016002-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Secondary Containment Inoperability Due to Inadequate Procedures |
| Description | The inspectors documented a self-revealing Green NCV of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, because Dominion did not develop a Unit 3 supplementary leak collection and release system (SLCRS) damper procedure that was adequate to prevent the inoperability of the system. Specifically, deficiencies in procedure SP 3614I.3A, Supplementary Leak Collection and Release System Boundary Isolation Damper Test, as well as the SLCRS damper monitoring program and preventative maintenance strategy, led to both trains of the Unit 3 SLCRS failing their respective surveillance tests resulting in the inoperability of secondary containment. After the issue was identified, Dominion entered the condition into their corrective action program (CAP) as condition report (CR)1033408, declared the secondary containment inoperable until the plant entered a mode of technical specifications non-applicability, and conducted walkdowns and repairs to the system to restore it to compliance. This performance deficiency was considered to be more than minor because it adversely affected the system, structure, and component (SSC) and barrier performance attribute of the Barrier Integrity cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. Specifically, inadequate maintenance of the SLCRS system led to a system differential pressure during operation that was not adequate to meet its design basis surveillance requirement and thus rendered the system inoperable. Additionally, the performance deficiency was similar to IMC 0612, Appendix E, minor example 2.a. The finding was evaluated in accordance with IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, and determined to be of very low safety significance (Green) since it only represented a degradation of the radiological barrier function provided for the auxiliary building. The finding is related to the cross-cutting aspect of Human Performance, Design Margins, because Dominion did not operate and maintain equipment within design margins. Specifically, Dominion did not appropriately monitor and maintain the SLCRS system in such a way that declining damper performance trends were identified and prevented prior to the inoperability of the system. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2016002 Section 1R15 |
| Date counted | Jun 30, 2016 (2016Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | C Highley C Newport G Dentel H. Anagnostopoulus J Ambrosini K Reid L Mckown P Kaufman P Presby |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion V |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
| ' | |
Finding - Millstone - IR 05000336/2016002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Millstone) @ 2016Q2
Self-Identified List (Millstone)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||