ENS 53290
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ENS Event | |
|---|---|
18:38 Mar 26, 2018 | |
| Title | Technical Specifications Required Shutdown Due to Inoperable Main Steam Isolation Valve |
| Event Description | On March 25, 2018 at 1833 CDT, while at 100 percent power, Farley Unit 1 (FNP-1) conservatively declared a single Main Steam Isolation Valve (MSIV) inoperable on the 1C Steam Generator line due to indication of Steam Generator pressure rise with a corresponding reduction in flow of that loop. FNP-1 began a reactor shutdown at 0400 CDT on March 26, 2018 to establish plant conditions to support testing the affected main steam line MSIVs while in the required action time of Technical Specification 3.7.2. At 1338 CDT on March 26, 2018, testing confirmed that the single MSIV was inoperable and that valve disassembly will be required. The duration of the valve repair would exceed the required action time of Technical Specification 3.7.2. This report is being made in accordance with 10 CFR 50.72(b)(2)(i), as a plant shutdown required by technical specifications.
The licensee has notified the NRC Resident Inspector.
This EN [event notification] is being updated to clarify the reporting criteria as 'Voluntary'. Farley Technical Specification 3.7.2 allows continuous operation in MODE 2 with an INOPERABLE MSIV as long as the other MSIV in the affected Main Steam Line is closed. The initiation of the shutdown was performed as a prudent action to repair and restore OPERABILITY of the affected MSIV and was not a requirement of the Farley Technical Specifications. The licensee notified the NRC Resident Inspector. The R2DO (Masters) was notified. |
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-0.32 h-0.0133 days <br />-0.0019 weeks <br />-4.38336e-4 months <br />) | |
| Opened: | Douglas Hobson 18:19 Mar 26, 2018 |
| NRC Officer: | Donald Norwood |
| Last Updated: | May 16, 2018 |
| 53290 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 532902018-03-26T18:38:00026 March 2018 18:38:00
[Table view]Other Unspec Reqmnt Technical Specifications Required Shutdown Due to Inoperable Main Steam Isolation Valve ENS 435932007-08-24T14:47:00024 August 2007 14:47:00 Other Unspec Reqmnt Reactor Trip Breaker Undervoltage Trip Failure During Surveillance Testing 2018-03-26T18:38:00 | |
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