SVP-20-074, Technical Specifications Section 5.6.6 Post Accident Monitoring Instrumentation Report

Technical Specifications Section 5.6.6 Post Accident Monitoring Instrumentation Report

ML20282A591
Person / Time
Site:	Quad Cities
Issue date:	10/08/2020
From:	Ohr K Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
SVP-20-074
Download: ML20282A591 (3)

Text

Exelon Generation SVP-20-074 October 8, 2020 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

Subject:

Quad Cities Nuclear Power Station, Unit 2 Renewed Facility Operating License No. DPR-30 NRC Docket No. 50-265 Technical Specifications Section 5.6.6 Post Accident Monitoring Instrumentation Report The purpose of this letter is to submit the Post Accident Monitoring (PAM) Instrumentation Report as required by Quad Cities Nuclear Power Station (QCNPS) Technical Specifications (TS) Section 5.6.6, "Post Accident Monitoring (PAM) Instrumentation Report."

On September 18, 2020 at 1626 CDT, a lead was lifted in the 2-0203-28 (28) Outboard Main Steam Isolation Valve (MSIV) position indication circuit in order to isolate a hard level Ill 125VDC ground on the Unit 1 125VDC Safety Related Battery system. A temporary configuration control package (TCCP) is controlling the lifted lead until the 28 MSIV open-position limit switch can be repaired/replaced during the next refueling outage. As such, the 28 MSIV "open" position indication will remain de-energized during that time.

The loss of MSIV position indication required entry into TS Section 3.3.3.1, "Post Accident Monitoring (PAM) Instrumentation," Condition A, due to an inoperable indication channel for Function 6 in Table 3.3.3.1-1, "Penetration Flow Path PCIV Position." Condition A requires restoration of the required indication channel to an operable status within 30 days, or initiate reporting requirements in accordance with TS Section 5.6.6.

Resolution of this issue within the 30-day requirement was not feasible due to the significant power reduction required to isolate and de-energize the 28 MSIV in order to establish a safe working boundary for personnel to repair/replace the degraded limit switch. For this reason, QCNPS is submitting this report in accordance with TS Section 5.6.6. Accordingly, the attached report outlines the preplanned alternate method of monitoring and the cause of the inoperability, as well as the plan and schedule for restoring the instrument channel to an operable status.

SVP-20-074 U.S. Nuclear Regulatory Commission Page2 Should you have any questions concerning this letter, please contact Sherrie Grant, Regulatory Assurance Manager, at (309) 227-2800.

4 Kenneth S. Ohr Site Vice President Quad Cities Nuclear Power Station

Attachment:

Post Accident Monitoring Instrumentation Report Inoperable Channel for Penetration Flow Path PCIV Position cc:

Regional Administrator - NRC Region Ill NRC Senior Resident Inspector-Quad Cities Nuclear Power Station

ATTACHMENT Post Accident Monitoring Instrumentation Report Inoperable Channel for Penetration Flow Path PCIV Position Preplanned Alternate Method of Monitoring An alternate method of monitoring the isolation function for the Unit 2 28 Outboard Main Steam Isolation Valve (MSIV) has been implemented. The alternate method requires Operations personnel, following an isolation signal, to verify that the "8" Main Steam Line flow indication on Main Control Room (MCR) panel 902-5 indicates zero flow.

This guidance has been communicated to Operations personnel and is included in an Operations Department notification for all Licensed personnel (Shift Training Notebook entry) and the Operations Turnover log. This alternate method provides an acceptable means of indication to ensure the MSIV isolation function has been accomplished.

Further, the loss of the 28 MSIV Post Accident Monitoring (PAM) indication is tracked in the Corrective Action Program via Issue Report 4371181.

It should be noted that the position indication for the inboard MSIV on the Unit 2 "8" Main Steam Line is fully functional.

Apparent Cause of the lnoperability The 28 outboard MSIV "Open" indication limit switch has been identified as the cause of a hard Level Ill ground on the U1 125VDC Safety Related battery system. Grounds can be indicators or precursors to serious degradation of equipment. All hard Level Ill grounds require initiation of immediate corrective actions to locate and remove or isolate the ground within 14 days, per UFSAR Section 8.3.2.2 (the 14-day clock started at 08:32 on 09/13/2020). At 16:26 on 09/18/2020, a lead was lifted in the 28 Outboard MSIV position indication circuit to isolate the ground. Lifting the lead caused the loss of "Open" position indication in the MCR on the 902-3 panel. Temporary Configuration Control Change 632596 is controlling the lifted lead.

Plans and Schedule for Returning Function to Operable Status Repairs to the 28 outboard MSIV "Open" indication limit switch will be performed under WO 5082770 during the next U2 planned refueling outage, Q2R26 (Spring 2022). The lifted lead will be returned to normal per WO 5080922, which will restore PAM indication.

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