ENS 52724
ENS Event | |
|---|---|
21:00 May 2, 2017 | |
| Title | Unanalyzed Condition for Combustion Turbine Generator Configuration |
| Event Description | On May 2, 2017, while performing a past operability review associated with Combustion Turbine Generator (CTG) 11-1, it was determined that a past configuration of CTG 11-1 could not have assured all of the applicable Appendix R success criteria under all of the postulated scenarios described in the Updated Final Safety Analysis Report [UFSAR]. From November 21, 2016 until March 18, 2017 when Mode 4 was entered, CTG 11-1 was in a configuration where it could not be started from the dedicated shutdown panel, although it could be started locally. One of the specific scenarios for Appendix R in the UFSAR credits CTG 11-1 to support a safe shutdown based on an assumed time required to start CTG 11-1 and then provide flow to the reactor pressure vessel using the Standby Feedwater System. During the time period where CTG 11-1 could only be started locally, this assumed time would have been exceeded. Therefore, this event is being reported as an 'unanalyzed condition that significantly affects plant safety' under 50.72(b)(3)(ii)(B). At the time of discovery, CTG 11-1 was fully operable and the described condition had already been corrected.
The NRC Resident Inspector has been notified.
The purpose of this notification is to retract a previous report made on May 2, 2017 (EN 52724) under 10 CFR 50.72(b)(3)(ii)(B). The notification to the NRC involved an event where Combustion Turbine Generator (CTG) 11-1 could only be started locally such that required operator actions during an Appendix R safe shutdown scenario could be delayed. Subsequent to the initial notification, the event, additional site documentation, and the NRC guidance in NUREG-1022 pertaining to 10 CFR 50.72(b)(3)(ii)(B) were reviewed further. lt was verified that Fermi 2 procedures contained actions to ensure Appendix R safe shutdown capability under the plant conditions during the relevant time period. A time validation study was performed [May 9, 2017] which verified that the operator actions could have been completed within the time described in the Updated Final Safety Analysis Report (UFSAR) for initiating Standby Feedwater flow to the reactor pressure vessel. In addition, a review of the supporting design calculation identified margin in the required time described in the UFSAR. Based on this information, the condition of CTG 11-1 during the time period from November 21, 2016 until March 18, 2017 would not have prevented compliance with the Appendix R safe shutdown requirements. Under these circumstances, the event does not represent an 'unanalyzed condition that significantly affects plant safety' under 10 CFR 50.72(b)(3)(ii)(B) per the guidance in NUREG-1022. Therefore, EN 52724 can be retracted and no Licensee Event Report (LER) under 10 CFR 50.73(a)(2)(ii)(B) is required to be submitted. The licensee has notified the NRC Resident Inspector. Notified R3DO (Cameron). |
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.43 h-0.101 days <br />-0.0145 weeks <br />-0.00333 months <br />) | |
| Opened: | Kelley Belenky 18:34 May 2, 2017 |
| NRC Officer: | Bethany Cecere |
| Last Updated: | May 19, 2017 |
| 52724 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 552312021-05-03T13:30:0003 May 2021 13:30:00
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