05000250/LER-2020-004, Re Manual Reactor Trip in Response to Automatic Trip of the 3B Steam Generator Feedwater Pump
| ML20281A330 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/07/2020 |
| From: | Pearce M Florida Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-2020-143 LER 2020-004-00 | |
| Download: ML20281A330 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
| 2502020004R00 - NRC Website | |
text
U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 RE: Turkey Point Unit 3 Docket No. 50-250 Repotiable Event: 2020-004-00 Date of Event: August 20, 2020 10 CFR 50.73 L-2020-143 October 7, 2020 Title: Manual Reactor Trip in Response to Automatic Trip of the 3B Steam Generator Feedwater Pump The attached Licensee Event Repoti 05000250/2020-004-00 is submitted pursuant to 10 CPR 50.73 (a)(2)(iv)(A), due to actuation of the Unit 3 Reactor Protection System and Auxiliary Feedwater System.
If there are any questions, please call Mr. Robert Hess at 305-246-4112 or e-mail Robe1i.Hess@fpl.com.
Sincerely, Michael Pearce Site Vice President - Turkey Point Nuclear Plant Florida Power & Light Company Attachments: USNRC Forms 366 and 366A, current revision cc: USNRC Senior Resident Inspector, Turkey Point Plant USNRC Regional Administrator, Region II Morida Power & Light Company 9760 SW 344th St., Homestead, FL 33035
Abstract
Turkey Point Unit 3 250 3
Manual Reactor Trip in Response to Automatic Trip of the 3B Steam Generator Feedwater Pump 08 20 2020 2020 004 00 10 07 2020 1
34%
David Stoia - Licensing Engineer (305) 246-6538
On 8/20/2020 at 23:58 hours the Unit 3 reactor was manually tripped from 34% power following an automatic trip of the 3B Steam Generator Feed Pump (SGFP). The 3B SGFP had tripped as a result of a low suction pressure condition that occurred when the pump recirculation valve was manually closed, which is the normal position for the plant conditions. The valve was open due to inadvertent mispositioning of the SGFP Recirculation Master Controller. The Auxiliary Feedwater System automatically initiated in response to the trip of the 3B SGFP. This event is reportable pursuant to 10 CFR 50.73 (a)(2)(iv)(A) for actuation of the Reactor Protection System (RPS) and Auxiliary Feedwater System (AFW).
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I ID Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
SIMILAR EVENTS
A review of reactor trip events over the previous 10 years was performed to identify similar events or patterns. No reactor trips have occurred due to an automatic low suction pressure trip of a SGFP. In 2018, a Reactor Operator discovered the Unit 4 SGFP Recirculation Valve Master Controller in Manual during a control room board walkdown. Investigation revealed that the Master Controller had reverted to Manual from Automatic mode 7 days prior. This event is described in AR 2263299 and will be assessed for common factors in RCE 2366158.
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