05000387/FIN-2011003-04: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 15: | Line 15: | ||
| CCA = N/A for ROP | | CCA = N/A for ROP | ||
| INPO aspect = | | INPO aspect = | ||
| description = On January 3,2011, PPL identified that a single point vulnerability existed in the RB heating, ventilation and air conditioning (HVAC) system in which the failure of a single nonsafety-related temperature controller coincident with outside ambient air temperatures below 10 degrees-Fahrenheit could result in a spurious SLD isolation causing simultaneous isolation of MSlVs, HPCI, and RCIC. The Updated Final Safety Analysis Report (UFSAR) 3.12.2.2.a states that failure of any nonsafetyrelated SSC shall not result in failure of any safety-related SSC. Additionally, UFSAR 3.12.2.1.1 states that redundant systems are separated from each other so that single failure of a component will not interfere with the proper operation of its redundanVdiverse component. This issue was determined to be a violation of 10 CFR 50 Appendix B, Criterion lll, Design Control, because PPL failed to ensure that the design requirements specified above were correctly translated into specifications, drawings, procedures and instructions. The performance deficiency was determined to be more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of Design Control, and affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding using IMC 0609, Attachment 4, lnitial Screening and Characterization of Findings, and determined the finding was Green because it was design or qualification deficiency confirmed not to result in a loss of operability or functionality because the two required conditions had not occurred simultaneously. The issue was entered into PPL's CAP as CR 1337940. | | description = On January 3,2011, PPL identified that a single point vulnerability existed in the RB heating, ventilation and air conditioning (HVAC) system in which the failure of a single nonsafety-related temperature controller coincident with outside ambient air temperatures below 10 degrees-Fahrenheit could result in a spurious SLD isolation causing simultaneous isolation of MSlVs, HPCI, and RCIC. The Updated Final Safety Analysis Report (UFSAR) 3.12.2.2.a states that failure of any nonsafetyrelated SSC shall not result in failure of any safety-related SSC. Additionally, UFSAR 3.12.2.1.1 states that redundant systems are separated from each other so that single failure of a component will not interfere with the proper operation of its redundanVdiverse component. This issue was determined to be a violation of 10 CFR 50 Appendix B, Criterion lll, Design Control, because PPL failed to ensure that the design requirements specified above were correctly translated into specifications, drawings, procedures and instructions. The performance deficiency was determined to be more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of Design Control, and affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding using IMC 0609, Attachment 4, lnitial Screening and Characterization of Findings, and determined the finding was Green because it was design or qualification deficiency confirmed not to result in a loss of operability or functionality because the two required conditions had not occurred simultaneously. The issue was entered into PPL\'s CAP as CR 1337940. | ||
}} | }} | ||
Revision as of 20:42, 20 February 2018
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2011003 Section 4OA7 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | P Kaufman J Furia A Rosebrook P Finney J Brand P Krohn E Torres J Greives |
| INPO aspect | |
| ' | |