05000251/LER-2025-003, B Component Cooling Pump and Its Associated Breaker Inoperable
| ML25216A111 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 08/04/2025 |
| From: | Mack K Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2025-138 LER 2025-03-00 | |
| Download: ML25216A111 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 2512025003R00 - NRC Website | |
text
l=PL U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re:
Turkey Point Unit 4 Docket No. 50-251 Renewed Facility Operating License No. DPR-41 Reportable Event: 2025-03-00 Date of Event: June 4, 2025 4B Component Cooling Pump and its Associated Breaker Inoperable August4,2025 L-2025-138 10 CFR 50.73 The attached Licensee Event Report (LER), Turkey Point Unit 4 LER 2025-03-00, 4B Component Cooling Pump and its Associated Breaker Inoperable, is being submitted pursuant to the requirements of 10 CFR 50. 73(a)(2)(i)(B), Condition Prohibited by Technical Specifications.
This event did not have an adverse effect on the health and safety of the public.
Should you have any questions regarding this submission, please contact Maribel Valdez, Fleet Licensing Manager, at 561-904-5164.
This letter contains no new or modified regulatory commitments.
Sincerely, K~~~
Director, Licensing and Regulatory Compliance Florida Power & Light Company Attachment cc:
USNRC Regional Administrator, Region II USNRC Project Manager, Turkey Point Nuclear Plant USNRC Senior Resident Inspector, Turkey Point Nuclear Plant Mr. Clark Eldredge, Florida Department of Health Florida Power & Light Company 9760 SW 344th Street, Homestead, FL 33035
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 04/30/2027 (04-02-2024)
Estimale<I bLrden pe, response to comply v.lh this mandatory collection request 80 ho!Ks. Reported lessons
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LICENSEE EVENT REPORT (LER) learned ae inCOfporated into the kensing process and fed back to industry. Send comments regarding burden estimate lo lhe FOIA, Lib<")', and Information Collections Branch (T <i A toM), U. S. Nuclear Regulatory
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(See Page 2 for required number of digits/characters for each block)
Commission, Washington, DC 20555-000 1, or by email lo lnfocollecls.Resource@rrc.gov, and lhe 0MB revie~<r
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at 0MB Office of Information and Regulatory Affai"s, (3150-<l104), Attn: Desk Officer for the Nuclear Regulatory (See NUREG-1022, R.3 for instruction and guidance for completing this form Commission, 725 17th Street NW, Washington, DC 20503, The NRC may not conduct or sponsor, and a person Is btlr:r /twww ars; gQvireadiag-an/!!Ql;*i;Qlli:s;!iQOSIDY!ll9S~!il~Cl Q22/c;J/l not required to respond to, a collection of information unless the document requesting or requiring the collection displays a currenlly vald 0MB control number.
- 1. Facility Name
~ 050 2, Docket Number 3, Page Turkey Point Unit 4 D
052 251 1 OF 2
- 4. Title 48 CCW Pump and its Associated Breaker Inoperable
- 5. Event Date
- 6. LER Number
- 7. Report Date 8, other Facilities Involved Month Day Year Year Sequential Revision Month Day Year Facility Name D
Docket Number Number No.
050 06 04 2025 2025 -
03 -
00 08 04 2025 Facility Name D
Docket Number 052 9, Operating Mode 110. Power Level 1
100%
)
16, Abstract (Limit to 1326 spaces, i.e., approximately 13 single-spaced typewritten lines)
On June 4, 2025, Breaker 4AB13[EIIS: EK] became wedged in a mid-racked position in the cubicle [EIIS: SB] during the rack-in process as part of restoration from 48 Component Cooling Water (CCW) Pump [EIIS: CC] motor inspection. On June 9, 2025, at 1445 EST, it was determined that Train B Switch 152/HH [EIIS: EK] was inoperable in addition to the 48 CCW pump. This prevented the Engineered Safety Features Actuation System (ESFAS) [EIIS:
JC] from providing the auto-start signal to the 4C CCW Pump during a Loss of Off-Site Power (LOOP) and/or Safety Injection (SI) condition. A jumper was installed to restore 4C CCW pump ESFAS operability. The remaining Train B ESFAS was fully capable of performing its safety function. This event is being reported pursuant to 10 CFR 50.73(a)
(2)(i)(B), Condition Prohibited by Technical Specifications.
Description of Event
- 2. DOCKET NUMBER
- 3. LER NUMBER I
251 D
NUMBER NO.
I YEAR SEQUENTIAL REV
~-I 03 1-0 On June 4, 2025 Breaker 4AB13 [EIIS: EK] became wedged in a mid-racked position within the cubicle [EIIS: SB]. On June 9, 2025, at 1445 EST, while in Mode 1 at 100% power, this was determined during post-maintenance testing following the 48 CCW Pump [EIIS: CC] Motor Inspection. The misaligned breaker rendered the 48 CCW Pump inoperable and prevented Train B Switch 152/HH [EIIS: EK] from providing the ESFAS [EIIS: JC] auto-start signal to the 4C CCW Pump during LOOP and/or SI conditions. The condition was immediately corrected through the installation of a jumper to restore the auto-start function. Additional equipment inspections were performed to verify the operability of related systems. A Past Operability Review (POR) concluded that the 4C CCW auto-start function was inoperable from the time of the initial breaker misalignment, on June 4, 2025, until corrective actions were completed. However, the remaining Train B ESFAS was fully capable of performing its safety function. This event is being reported pursuant to 10 CFR 50.73(a)(2)(i)
(8), Condition Prohibited by Technical Specifications.
Cause of Event
The cause of the loss of 4C CCW ESFAS Auto-start Function was a failure of Breaker 4AB13 locking open the 152/HH Breaker Position Switch. Normally, when the 48 CCW pump is unavailable Breaker 4AB 13 is open and in the racked down position which closes the 152/HH 5-5T contact and arms the auto start circuit path for the 4C CCWPump.
Safety Significance
The ESFAS was unable to provide the auto start signal to the 4C CCW Pump during a LOOP and/or SI condition, this was corrected by the installation of a jumper. The remaining Train B ESFAS was fully capable of performing its safety function.
Additionally, the 4C CCW pump was available for manual start from either the Control room or locally at the 40 Switchgear Room and the auto-start circuit path from a low CCW discharge pressure was also available during this time.
This event is being reported pursuant to 10 CFR 50.73(a)(2)(i)(B), Condition Prohibited by Technical Specifications.
Corrective Actions
A jumper was installed in the field across the locked open breaker position switch contact, 152/HH 5-5T. The jumper restored the 48 ESFAS auto-start function to the 4C CCW pump.
Similar Events
A review of events over the past 5 years did not identify any similar events with the same cause as this event. Page 2
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