ENS 47787
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ENS Event | |
|---|---|
22:00 Mar 29, 2012 | |
| Title | Unanalyzed Condition Impacting Appendix R Separation Requirements |
| Event Description | At the Browns Ferry Nuclear Power Plant (BFN), exclusion 'Red Zones' are established for compliance with the 20-foot separation requirements of Appendix R section III.G.2.b as modified by the associated NRC approved exemption for BFN issued on March 29, 2007. On March 28, 2012, it was determined that intervening combustible materials, i.e., cables, found in exclusion 'Red Zones' were not in conformance with Appendix R Section III.G.2.b and the associated NRC approved exemption issued for BFN. As a result of the intervening combustible material found in the exclusion 'Red Zones,' the degree of separation for redundant Appendix R safe shutdown trains is lacking.
This condition is being reported pursuant to 10 CFR 50.72(b)(3)(ii)(B). Any event or condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. The NRC Resident Inspector has been informed. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.67 h-0.0279 days <br />-0.00399 weeks <br />-9.17766e-4 months <br />) | |
| Opened: | David Hal 21:20 Mar 29, 2012 |
| NRC Officer: | Charles Teal |
| Last Updated: | Mar 29, 2012 |
| 47787 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (95 %) |
| After | Power Operation (95 %) |
WEEKMONTHYEARENS 542662019-09-11T00:34:00011 September 2019 00:34:00
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