05000354/LER-2023-003-01, Inadvertent Main Turbine Control Valve Closure Caused Reactor Scram
| ML24079A283 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 03/19/2024 |
| From: | Mclaughlin R Public Service Enterprise Group |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| LR-N24-0027 LER 2023-003-01 | |
| Download: ML24079A283 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
| 3542023003R01 - NRC Website | |
text
Robert D. McLaughlin Plant Manager, Hope Creek Generating Station, PSEG Nuclear LLC PO Box 236 Hancocks Bridge, New Jersey 08038-0221 10 CFR 50.73 LR-N24-0027 March 19, 2024 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-001
Subject:
Hope Creek Generating Station Renewed Facility Operating License No. NPF-57 Docket No. 50-354 Licensee Event Report 2023-003-01, Inadvertent Main Turbine Control Valve Closure Caused Reactor Scram PSEG Nuclear LLC submits the attached licensee event report supplement per 10 CFR 50.73(a)(2)(iv)(A).
There are no regulatory commitments contained in this submittal.
Please contact Ms. Bernadette Humphrey at (856) 339 - 1308 if you have questions.
Sincerely, Robert D. McLaughlin Plant Manager, Hope Creek Generating Station Attachment: Licensee Event Report cc:
USNRC Regional Administrator Region 1 USNRC NRR Project Manager - Hope Creek USNRC Senior Resident Inspector - Hope Creek NJ Department of Environmental Protection, Bureau of Nuclear Engineering o PSEG I NUCLEAR
Abstract
Hope Creek Generating Station 00354 3
12 14 2023 2023 003 01 03 2024 1
88 (856) 339 - 1308 On December 14, 2023, at 1939 EST, while attempting to manually close a failed open #4 turbine control valve (TCV), the #4 TCV closed rapidly. This caused a scram on average power range monitor (APRM) high neutron flux due to a rise in reactor pressure.
Hope Creek Generating Station (HCGS) repaired the #4 TCV by replacing the servo valve. In addition, the fast-acting solenoid (FAS) valve and the shutoff valve were replaced. HCGS synchronized the Main Generator to the grid on December 17, 2023, at 1537 EST.
19
~./;(,-,>" ~£<111,.,,.0._
~
~
~
~+-?,..,.11**._o' 00 Inadvertent Main Turbine Control Valve Closure Caused Reactor Scram I
[{]
Bernadette Humphrey
[{] Page of
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
052 050
CAUSE OF EVENT
Rapid closure of the #4 TCV caused a scram on APRM high neutron flux.
The direct cause of the full open #4 TCV was foreign material exclusion (FME) practices were not implemented correctly by the work groups. Decision makers believed manually operating the FAS could be done in a controlled manner; however, the subsequent fast closure of the #4 TCV resulted in the reactor scram.
The human performance related cause of this event was inadequate adherence to applicable administrative tools and processes. Vendor information was acted upon without employing a formal decision-making process.
SAFETY CONSEQUENCES AND IMPLICATIONS
There were no safety consequences because of this event. There was no radiological release. All safety equipment functioned as designed.
PREVIOUS EVENTS There have been no previous events at HCGS in the last three years where the #4 TCV caused a reactor scram.
CORRECTIVE ACTIONS
- 1. Hope Creek Generating Station (HCGS) repaired the #4 TCV by replacing the servo valve, the fast-acting solenoid valve, and shutoff valve. HCGS synchronized the Main Generator to the grid on December 17, 2023, at 1537 EST.
- 2. Revise applicable EHC procedures which involve manual FAS valve manipulations while on-line.
- 3. Conduct training to review roles and responsibilities of the station duty team during the response to emergent issues.
Additional actions are being tracked in the licensees Corrective Action Program.
COMMITMENTS
There are no regulatory commitments in this LER.
3 3
Hope Creek Generating Station 00354 2023 003 01
~c,J>P. REGt,(,.>O f~t?
~
~
,i
..;.+-,
+O'
- 11t**
I
~
I I D I