05000461/FIN-2011002-06
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Apparent Interaction Between Non-Safety Related and Safety-Related Portions of the NSPS Causing Spurious Component Actuations |
| Description | CPS UFSAR Section 7.2.1.1.4.8 states, in part, that the STS was designed to meet the separation requirements of Regulatory Guide 1.75 and interfaces are by means of high impedance isolation devices to ensure that failures in the STS will not propagate to the safety equipment. The UFSAR specifically noted that any STS failure would not degrade the NSPS function since STS was isolated from NSPS, eliminating failure propagation. From initial licensing in 1987 and prior to August 26, 2010, the licensee failed to ensure that the safety-related portion of the NSPS was isolated from the non-safety related STS as specified in its design basis. As a result, safety-related components (i.e., primary containment isolation valves) repositioned independent of operator action or a valid signal on March 15, 2010, and during August 24 through 26, 2010. The failure to ensure that the design basis was correctly translated into the design specifications for the STS is a Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control. The NRC determined that this violation resulted from matters not reasonably within the licensees control; that is, the failure to meet the requirements could not be readily identified and, therefore, addressed. Therefore, in accordance with the Enforcement Policy, and after consultation with the Director of the Office of Enforcement and the Region III Regional Administrator, the NRC has decided to exercise enforcement discretion in accordance with Section 3.5 of the NRC Enforcement Policy and to refrain from issuing enforcement action for the violation. In accordance with the NRCs Reactor Oversight Process, this condition will not be considered in the assessment process or the NRCs Action Matrix. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2011002 Section 4OA5 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | Violation: Severity level Enforcement Discretion |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Orlikowski J Cassidy B Kemker C Brown S Mischke D Lords S West |
| INPO aspect | |
| ' | |
Finding - Clinton - IR 05000461/2011002 | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Clinton) @ 2011Q1
Self-Identified List (Clinton)
| |||||||||||||||||||||||||||||||||||||||||||