NL-17-1401, Post Accident Monitoring Report for 8 Train RVLIS

Post Accident Monitoring Report for 8 Train RVLIS

ML17222A385
Person / Time
Site:	Farley
Issue date:	08/10/2017
From:	Madison D Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-17-1401
Download: ML17222A385 (3)

Text

4- Southern Nuclear Dennis R. Madison Vice President- Farley Joseph M. Farley Nuclear Plant 7388 North State Hwy 95 Columbia, Alabama 36319334.814.4511 tel 334.814.4575 fax drmadlso@southemco.com AUG 1 0 2017 Docket No: 50-364 NL-17-1401 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant- Unit 2 Post Accident Monitoring Report for "8" Train RVLIS Ladies and Gentlemen:

In accordance with the requirements of Joseph M. Farley Nuclear Plant (FNP) Technical Specification (TS) 5.6.8, the enclosed Post Accident Monitoring Report is submitted for the inoperability of the Unit 2 "8" Train Reactor Vessel Level Indication System. On July 30, 2017, FNP exceeded the 30-day required completion time to return the channel to OPERABLE status per TS 3.3.3, "Post Accident Monitoring Instrumentation."

This letter contains no NRC commitments. If you have any questions, please contact Elizabeth Williford, Farley Regulatory Affairs Manager, at 334.814.4765.

Respectfully submitted,

.t:Jfor?~Y?~

D. A. Madison Vice President - Farley DRMIRGS/cbg

Enclosure:

Post Accident Monitoring Report cc: Regional Administrator, Region II NRR Project Manager- Farley Senior Resident Inspector - Farley RTYPE: CFA04.054

Joseph M. Farley Nuclear Plant - Unit 2 Post Accident Monitoring Report for 11 8 11 Train RVLIS Enclosure Post Accident Monitoring Report

Enclosure to NL-17-1401 Post Accident Monitoring Report This report is being submitted due to the Unit 2 "B" train Reactor Vessel Level Indicating System (RVLIS) instrumentation not being restored to OPERABLE status within the time required by Technical Specification (TS) 3.3.3, Post Accident Monitoring (PAM) Instrumentation. TS 3.3.3 requires two channels of RVLIS instrumentation to be OPERABLE while in MODES 1, 2, and 3, with inoperable instruments restored to OPERABLE status within 30 days. If not restored within the 30 day period, a PAM report is required to be submitted within the following 14 days per TS 5.6.8.

This report outlines the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the instrumentation channels to OPERABLE status.

Summary of the PAM Instrument lnoperabllity:

On June 30, 2017, the Unit 2 operating crew identified that Integrated Plant Computer (I PC) indication was erratic for "B" train RVLIS. All eight sensors of the "B" train channel had erratic indication and were flashing between green and red. The operating crew declared the "B" train channel inoperable and entered TS 3.3.3 Condition "A" for function 16, RVLIS. Unit 2 "A" Train was verified to be operating properly and fully OPERABLE during the same timeframe. A Condition Report (CR) was generated to document the observation of erratic IPC indication for "B" train RVLIS.

Preplanned Alternate Method of Monitoring:

There are two alternative means of monitoring to compensate for the out of service "B" train RVLIS channel. The first option is the use of the Unit 2 "A" train RVLIS channel which remains OPERABLE and can provide the necessary parameters required by the operating crew.

Alternatively, the operating crew could use diverse indication such as those listed in Table 3.3.3-1, which includes pressurizer water level and reactor coolant system subcooling margin monitor, both are currently fully OPERABLE.

Cause of the lnoperability The failure of the "B" train RVLIS channel has been investigated to the extent possible while at full power. During troubleshooting it was identified that all eight heaters associated with heated junction thermocouple system channel were shorted to ground. Further troubleshooting and repair cannot be performed online due the location of these connections.

Plans and Schedule for Restoring the Instrumentation Channel to OPERABLE status:

The plan for restoring the Unit 2 "B" train RVLIS channel to OPERABLE status is to replace deficient parts during the upcoming refueling outage (2R25). In addition to the parts required to rebuild the connections points, contingency parts are also being procured should probe and cable replacement be also necessary.

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