RA17-031, Post Accident Monitoring Report

Post Accident Monitoring Report

ML17090A463
Person / Time
Site:	LaSalle
Issue date:	03/31/2017
From:	Trafton W Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RA17-031
Download: ML17090A463 (2)

Text

LaSalle County Station Exelon Generation,. 2601 North 21st Road Marseilles, IL 61341 815-415-2000 Telephone www.exeloncorp.com RA17-031 March 31, 2017 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Unit 1 Renewed Facility Operating License No. NPF-11 NRC Docket No. 50-373

Subject:

Post Accident Monitoring Report The attached report is submitted in accordance with LaSalle County Station, Unit 1 Technical Specifications (TS) 3.3.3.1, "Post Accident Monitoring (PAM) Instrumentation,"

and TS 5.6.6, "Post Accident Monitoring (PAM) Instrumentation Report." The report is required due to the inoperability of one testable check valve position indication for a period greater than the 30 day restoration time. Accordingly, this report is due on April 3, 2017.

There are no regulatory commitments contained in this letter. Should you have any questions concerning this letter, please contact Mr. Guy V. Ford, Jr., Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, W1"--f;CfL William J. Trafton Site Vice President LaSalle County Station

Attachment:

LaSalle Unit 1 Post Accident Monitoring Report cc: Regional Administrator- NRC Region Ill NRC Senior Resident Inspector- LaSalle County Station

LaSalle Unit 1 Post Accident Monitoring Report This report is submitted for LaSalle County Station, Unit 1 in accordance with Technical Specifications (TS) 5.6.6, "Post Accident Monitoring (PAM) Instrumentation Report."

Additionally, TS 3.3.3.1, "Post Accident Monitoring (PAM) Instrumentation," requires two channels of Penetration Flow Path Primary Containment Isolation Valve (PCIV) position indication to be operable during plant operations in Modes 1 and 2.

On February 17, 2017, the position indication for one feedwater line outboard testable check valve was declared inoperable and TS 3.3.3.1, Condition A was entered, which requires restoration of the channel to operable status in 30 days. If TS 3.3.3.1, Condition A is not satisfied within 30 days, then TS 3.3.3.1, Condition B is entered.

Exelon Generation Company, LLC has determined that the position indication cannot be restored with 30 days; therefore, TS 3.3.3.1, Condition B requires immediate initiation of action in accordance with TS 5.6.6 to submit a written report within 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability and the plans/schedule for restoring the instrument channel of the function to operable status.

Description of Issue On February 17, 2017, the light indication for the Unit 1 'A' feedwater line outboard testable check valve 1B21-F032A at Main Control Room (MGR) panel 1H13-P601 indicated that the valve was full open, based on the open light on and closed light off.

The white light that indicates the valve was less than 85 percent open was also lit, which was consistent with plant operations at the time with 10 percent reactor power with low feed flow. However, at these plant conditions the closed light would be expected to also be lit, but it was not.

The closed indication light bulb was replaced, and the resistor and socket were verified functional as part of troubleshooting. Shift operations verified the feed flow by trending the plant process computer (PPG) points for feedwater 'A' and 'B' header flow, with no discrepancies noted. Both loops trended together within tolerance. Without the positive closed indication in the MCA, the valve position indication was declared inoperable.

Preplanned Alternate Method of Monitoring PPG Primary Containment Isolation System (PCIS) screen and PPG points 0779 and 0780 are the preplanned alternate method for monitoring the post-accident position of valve 1821-F032A.

Cause of the Inoperable Condition The cause of valve 1B21-F032A position indication malfunction is the limit switches, which require adjustment. Based on the flow indications observed, the valve remains fully functional. However, in order to perform the required surveillances for the closed indication of valve 1B21-F032A, the system is required to have no system flow. Further troubleshooting and repair of the limit switches were precluded while the plant is operating in Mode 1 with the feedwater system in service.

Plans and Schedule for Restoration The repair of the limit switches are scheduled for the first opportunity, in accordance with the station work control process, no later than the upcoming Unit 1 refueling outage L 1R17 scheduled for February 2018.

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