ENS 50198: Difference between revisions
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| event date = 06/12/2014 14:44 EDT | | event date = 06/12/2014 14:44 EDT | ||
| last update date = 06/12/2014 | | last update date = 06/12/2014 | ||
| title = System Restoration Error Causes Both Trains | | title = System Restoration Error Causes Both Trains of Control Structure Chilled Water System to Be Inoperable | ||
| event text = On 6/12/2014, [multiple Limiting Condition of Operations] LCOs were entered on SSES Units 1 and 2 for an inoperable Division 2 train of Control Structure Chilled Water starting at 1344 EDT for the planned performance of a flow surveillance. During restoration steps at 1444 EDT on 6/12/2014, a Division 1 Control Structure Chilled Water control switch was mistakenly manipulated which caused the redundant operable train to be declared inoperable. During this time both divisions of Control Structure Chillers were inoperable and were not available to perform the required safety function. This is a condition that, at the time of discovery, could have prevented fulfillment of a Safety Function and is reportable under [10 CFR] 50.72(b)(3)(v)(D) as an 8 hour notification. | | event text = On 6/12/2014, [multiple Limiting Condition of Operations] LCOs were entered on SSES Units 1 and 2 for an inoperable Division 2 train of Control Structure Chilled Water starting at 1344 EDT for the planned performance of a flow surveillance. During restoration steps at 1444 EDT on 6/12/2014, a Division 1 Control Structure Chilled Water control switch was mistakenly manipulated which caused the redundant operable train to be declared inoperable. During this time both divisions of Control Structure Chillers were inoperable and were not available to perform the required safety function. This is a condition that, at the time of discovery, could have prevented fulfillment of a Safety Function and is reportable under [10 CFR] 50.72(b)(3)(v)(D) as an 8 hour notification. | ||
The loss of safety function is based on 1) the SSC is inoperable in a required mode of operation, 2) the inoperability is due to personnel error, and 3) there was no redundant equipment in the same system that was operable. | The loss of safety function is based on 1) the SSC is inoperable in a required mode of operation, 2) the inoperability is due to personnel error, and 3) there was no redundant equipment in the same system that was operable. | ||
Latest revision as of 21:50, 1 March 2018
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.25 h-0.0104 days <br />-0.00149 weeks <br />-3.4245e-4 months <br />) | |
| Opened: | Ron Fry 18:29 Jun 12, 2014 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Jun 12, 2014 |
| 50198 - NRC Website
| |
Susquehanna with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |