05000412/LER-2023-004, Condition Prohibited by Technical Specification and Loss of Safety Function Due to Emergency Diesel Generator Lube Oil Contamination by Fuel Oil

Condition Prohibited by Technical Specification and Loss of Safety Function Due to Emergency Diesel Generator Lube Oil Contamination by Fuel Oil

ML23251A141
Person / Time
Site:	Beaver Valley
Issue date:	09/08/2023
From:	Blair B Energy Harbor Nuclear Corp
To:	Document Control Desk
References
L-23-197 LER 2023-004-00
Download: ML23251A141 (1)

LER-2023-004, Condition Prohibited by Technical Specification and Loss of Safety Function Due to Emergency Diesel Generator Lube Oil Contamination by Fuel Oil

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor
4122023004R00 - NRC Website

text

energy harbor Barry N. Blair Site Vice President I

September 8, 2023 L-23-197 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 LER 2023-004-00 10 CFR 50.73 Beaver Valley Power Station P.O. Box4 Shippingport, PA 15077 724-682-5234 Fax: 724-643-8069 Enclosed is Licensee Event Report (LER) 2023-004-00, "Condition Prohibited by Technical Specifications and Loss of Safety Function due to Emergency Diesel Generator Lube Oil Contamination by Fuel Oil." This event is being reported in accordance with 10 CFR 50.73(a)(2)(i)(B), 10 CFR 50.73(a)(2)(v)(A) and 10 CFR 50. 73(a)(2)(v)(D).

There are no regulatory commitments contained in this submittal. If there are any questions or if additional information is required, please contact Ms. Julie Hartig, Manager (Acting), Regulatory Compliance and Emergency Response, at 724-682-4224.

Sincerely, W,r,..1;,kf\\.

CoT,tOJ Barry N. Blair fuf.._

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&.,A IL Enclosure: Beaver Valley Power Station, Unit No. 2 LER 2023-004-00 cc:

NRC Region I Administrator NRC Senior Resident Inspector NRC Project Manager INPO Records Center (via INPO Industry Reporting and Information System)

BRP/DEP

Enclosure L-23-197 Beaver Valley Power Station, Unit No. 2 LER 2023-004-00

Abstract

Beaver Valley Power Station, Unit No. 2

00412 4

Condition Prohibited by Technical Specification and Loss of Safety Function due to Emergency Diesel Generator Lube Oil Contamination by Fuel Oil 07 12 2023 2023 004 00 09 08 2023 1

100

Julie Hartig, Manager (Acting), Regulatory Compliance and Emergency Response 724-682-4224

At 1617 on July 12, 2023, with Beaver Valley Power Station, Unit No. 2 (BVPS-2) at 100 percent power in Mode 1, the 2-2 Emergency Diesel Generator (EDG) was declared Inoperable due to its Rocker Arm Lube Oil (LO) System viscosity degrading such that the required 30-day mission time would not be met. This was likely due to Fuel Oil System leakage into the Rocker Arm LO System from a loose fuel oil injection line packing nut. The effectiveness of torquing the packing nut was indeterminate during subsequent LO test results. Compensatory measures were implemented to monitor and maintain the LO viscosity within the required limit by a proceduralized drain and fill process that will be executed based on LO sample results and EDG run time. The 2-2 EDG was declared Operable at 0615 on July 15, 2023.

This event is reportable as a Condition Prohibited by Technical Specifications per 10 CFR 50.73(a)(2)(i)(B) and as a Loss of Safety Function per 10 CFR 50.73(a)(2)(v)(A) and (D). The additional planned corrective action is to implement a permanent repair if fuel oil leakage increases during continued monitoring. Enhancements include revising the maintenance procedures to check the tightness of fuel oil packing nuts and to replace the high-pressure fuel oil line O-rings and packing on both EDGs.

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3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.

052 050

Completed Corrective Actions

1) The packing nut associated with the fuel injection line to the No. 11 cylinder has been tightened.

2) Compensatory measures have been implemented to ensure the Rocker Arm LO System required viscosity is maintained.

Planned Corrective Actions

1) Perform a permanent repair if there is evidence of increased leakage that dilutes the LO greater than 0.11 percent/hour.

Planned Enhancements:

1) Revise maintenance procedures to check the tightness of the fuel oil packing nuts.

2) As these are likely original equipment, replace the high-pressure fuel oil line O-rings and packing on the 2-1 and 2-2 EDGs.

PREVIOUS SIMILAR EVENTS

A review for similar events was performed. The 2-2 EDG LO had degraded viscosity due to fuel oil intrusion because of an air bound gravity drain line from the fuel oil injection pumps to the underground storage tank. This prevented excess fuel oil from the fuel oil injection pumps from draining and allowed intrusion into the LO. The 2-2 EDG was declared Inoperable, and a Condition Prohibited by Technical Specifications and a Loss of Safety Function was reported in LER 2022-001-00 on September 8, 2022. Although the events were similar in nature, the cause was unrelated to this issue.

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Beaver Valley Power Station, Unit No. 2 00412 2023 004 00

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