05000335/LER-2022-002, Condition Prohibited by Technical Specifications
| ML22301A124 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 10/28/2022 |
| From: | Strand D Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| LER 2022-002-00 | |
| Download: ML22301A124 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) |
| 3352022002R00 - NRC Website | |
text
U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re:
St. Lucie Unit 1 Docket No. 50-335 Reportable Event: 2022-002-00 Date of Event: August 31, 2022 Condition Prohibited by Technical Specifications October 28, 2022 L-2022-178 10 CFR 50.73 The attached Licensee Event Report 2022-002 is being submitted pursuant to the requirements of 10 CFR 50.73 to provide notification of the subject event.
Respectfully, Dianne Strand General Manager, Regulatory Affairs Florida Power & Light Company Attachment cc:
St. Lucie NRC Senior Resident Inspector St. Lucie NRC Program Manager Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 0813112023 (08-2020) 3.Page St. Lucie Unit 1 05000335 1 of 2
- 4. Title Condition Prohibited by Technical Specifications
- 5. Event Date
- 6. LER Number
- 7. Report Date
- 8. Other Facilities Involved Year I Sequential I Revision Facility Name Docket Numbe Month Day Year Number Number Month Day Year n/a 05000 Facility Name Docket Numbe 8
31 2022 2022 -
002 -
00 10 28 2022 n/a 05000
- 9. Operating Mode 110. Power Level 1
100%
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 10 CFR Part 20 D
20.2203(a)(2)(vi) 50.36(c)(2)
D 50.73(a)(2)(iv)(A) 50.73(a)(2)(x) 0 20.2201(b)
D 20.2203(a)(3)(i) 50.46(a)(3)(ii)
D 50.73(a)(2)(v)(A) 10 CFR Part 73 0 20.2201 (d)
D 20.2203(a)(3)(ii) 50.69(g)
D 50.73(a)(2)(v)(B) 73.71 (a)(4)
D 20.2203(a)(1)
D 20.2203(a)(4) 0 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(C) 73.71 (a)(5) 20.2203(a)(2)(i) 10 CFR Part 21 IZl 50.73(a)(2)(i)(B)
IZl 50. 73(a)(2)(v)(D)
D 73.77(a)(1) 20.2203(a)(2)(ii) 21.2(c) 50.73(a)(2)(i)(C)
D 50.73(a)(2)(vii) 73.77(a)(2)(i)
D 20.2203(a)(2)(iii) 10 CFR Part 50 0 50.73(a)(2)(ii)(A)
D 50.73(a)(2)(viii)(A) 73.77(a)(2)(ii)
D 20.2203(a)(2)(iv) 50.36(c)(1 )(i)(A) 0 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B) 20.2203(a)(2)(v) 0 50.36(c)(1)(ii)(A)
D 50.73(a)(2)(iii)
- 50. 73(a)(2)(ix)(A)
OTHER {Specify here, in abstract or in NRG 366A)
- 12. Licensee Contact for this LER Licensee Contact I Telephone Number (Include area code)
Bob Murrell, Licensing Engineer 319-851-7900 Cause System Component Manufacturer Reportable
Cause
System Component Manufacturer Reportable To IRIS To IRIS X
BH FLT y
- 14. Supplemental Report Expected
- 15. Expected Month Day Year DYES (ff yes, complete 15. Expected Submission Date)
IZl NO Submission Date Abstract (Limit to 1560 spaces, i.e., approximately 15 single-spaced typewritten lines)
On August 31, 2022 with Unit 1 in Mode 1 at 100% power, charcoal samples were taken for the Emergency Core Cooling System (ECCS) Ventilation System, HVE-9A and HVE-9B, in accordance with the Ventilation Filter Testing Program (VFTP) and Technical Specification (TS) 4.7.8.1.b.
Laboratory results were received on September 3, 2022. The laboratory test results failed to meet the required performance efficiency of greater or equal to 97.5 percent Methyl. Specifically, HVE-9A was at 93.95 percent and HVE-9B was at 96.74 percent. Therefore, both trains of ECCS Ventilation System were inoperable from August 31, 2022, which placed the unit in TS Limiting Condition for Operation (LCO) 3.0.3. TS LCO 3.0.3 requires the unit to be in cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> starting from August 31, 2022. Unit 1 failed to meet this LCO resulting in a Condition Prohibited by TS. New filter beds were subsequently installed during a planned refueling outage. This event is being reported pursuant 10 CFR 50. 73(a)(2)(i)(B), and 50. 73(a)(2)(v)(D). This event resulted in a Safety System Functional Failure.
Description
05000335 Year 2022 I
Sequential Number 002 I
Rev No.
00 On August 31, 2022 with Unit 1 in Mode 1 at 100% power, charcoal samples were taken for the Emergency Core Cooling System (ECCS) Ventilation System, HVE-9A and HVE-98, in accordance with the Ventilation Filter Testing Program (VFTP) and Technical Specification (TS) 4.7.8.1.b.
Laboratory results were received on September 3, 2022.The laboratory test results failed to meet the required performance efficiency of greater or equal to 97.5 percent Methyl. Specifically, HVE-9A was at 93.95 percent and HVE-98 was at 96.74 percent. Therefore, both trains of ECCS Ventilation System were inoperable from August 31, 2022, which placed the unit in TS Limiting Condition for Operation (LCO) 3.0.3. TS LCO 3.0.3 requires the unit to be in cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> starting from August 31, 2022. Unit 1 failed to meet this LCO resulting in a Condition Prohibited by TS.
Cause of the Event
Charcoal efficiency is measured in-place and via laboratory testing to ensure that the charcoal is not degrading below the minimum levels defined in ANSI N-510-1975. The testing is performed on an 18-month frequency per VFTP. Charcoal life cannot be predicted and is therefore replaced when it no longer meets the minimum efficiency required. Due to exposure to moisture laden air the life of the charcoal is decreased and requires replacement.
Analysis of the Event
This licensee event report is being submitted in accordance with 10 CFR 50. 73(a)(2)(i)(B), and as a Condition Prohibited by TS, and 50.73(a)(2)(v)(D), as an Event or Condition that Could Have Prevented Fulfillment of a Safety Function. This event resulted in a Safety System Functional Failure.
Safety Significance
During the time between taking the charcoal bed samples on August 31, 2022, and the start of refueling outage SL 1-31 on September 3, 2022, both trains of the ECCS Ventilation System were below their VFTP efficiency requirements.
Corrective Actions
Refurbished charcoal trays were procured and installed in HVE-9A and HVE-98 during scheduled refueling outage SL 1-31.
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