05000529/LER-2023-001, Regarding Unit 2 Automatic Reactor Trip on Low Steam Generator Water Level Due to Degraded Feedwater Flow
| ML23213A189 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/01/2023 |
| From: | Harbor C Arizona Public Service Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 102-08642-CDH/TR LER 2023-001-00 | |
| Download: ML23213A189 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| 5292023001R00 - NRC Website | |
text
10 CFR 50.73 A member of the STARS Alliance, LLC Callaway
- Diablo Canyon
- Palo Verde
- Wolf Creek Cary D. Harbor Vice President Regulatory & Oversight Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel: 623.393.7953 102-08642-CDH/TR
$XJXVW1, 2023 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
Palo Verde Nuclear Generating Station Unit 2 Docket No. STN 50-529 /Renewed License No. NPF-51 Licensee Event Report 2023-001-00 Enclosed, please find the Licensee Event Report (LER) 50-529/2023-001-00 that has been prepared and submitted pursuant to 10 CFR 50.73. This LER reports an event in which Unit 2 had an unplanned automatic reactor trip on low steam generator water level on June 2, 2023.
In accordance with 10 CFR 50.4, copies of this LER are being forwarded to the Nuclear Regulatory Commission (NRC) Regional Office, NRC Region IV, and the Senior Resident Inspector.
No new commitments are being made to the NRC by this letter. Should you need further information regarding this submittal, please contact Michael DiLorenzo, Department Leader, Nuclear Regulatory Affairs, at (623) 393-3495.
Sincerely, CDH/TR/cr Enclosure: Unit 2 Licensee Event Report 2023-001-00 cc:
J. Monninger NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS L. N. Merker NRC Senior Resident Inspector for PVNGS Harbor, Cary (Z16762)
Digitally signed by Harbor, Cary (Z16762)
Date: 2023.08.01 09:08:23 -07'00'
ENCLOSURE Unit 2 Licensee Event Report 2023-001-00
Abstract
Palo Verde Nuclear Generating Station (PVNGS) Unit 2
00529 5
Unit 2 Automatic Reactor Trip On Low Steam Generator Water Level Due To Degraded Feedwater Flow 06 02 2023 2023 001 00 08 01 2023 1
100
Michael DiLorenzo, Department Leader, Nuclear Regulatory Affairs 623-393-3495 B
SJ FCV G080 Y
09 15 2023 Unit 2 experienced an automatic reactor trip from 100 percent power on June 2, 2023 at 0405 Mountain Standard Time due to a drifting down of the "A" feedwater (FW) pump speed. Feedwater control system (FWCS) speed demand increased, as expected, to counter the reduction in feedwater flow; however, the "A" FW pump speed was unresponsive to demand. The "B" FW pump speed increased in response to the increased demand signal with no abnormalities. Steam Generator (SG) 1 and SG 2 wide-range level indications lowered to 44 percent, which resulted in a reactor trip and turbine trip.
The cause investigation is in progress. The results of the completed cause investigation will be reported in a supplement to this Licensee Event Report. Page of
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
052 050 The corrective actions from the previous LER event would not have prevented the event which is the subject of this Licensee Event Report.
5 5
Palo Verde Nuclear Generating Station Unit 2 00529 2023 001 00