ULNRC-06542, SR-2019-003 for Callaway Plant, Unit 1, Inoperability of Loose Parts Detection System Channel 3 for Greater than 30 Days

SR-2019-003 for Callaway Plant, Unit 1, Inoperability of Loose Parts Detection System Channel 3 for Greater than 30 Days

ML19322A085
Person / Time
Site:	Callaway
Issue date:	11/18/2019
From:	Wink R Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06542 SR-2019-003
Download: ML19322A085 (4)

Text

7Aiiieien MISSOURI Callaway Plant

November 18, 2019 ULNRC-06542 U.S. Nuclear Regulatory Commission AUn: Document Control Desk Washington, DC 20555-000 1 10 CFR 50.36 Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

RENEWED FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 2019-03:

INOPERABILITY OF LOOSE PARTS DETECTION SYSTEM CHANNEL 3 FOR GREATER THAN 30 DAYS Enclosed is a special report addressing the inoperability of Channel 3 of the Loose Parts Detection system at Callaway Energy Center.

No new commitments are identified in this correspondence, and none of the material in this report is considered proprietary by Union Electric Company (Ameren Missouri).

If you have any questions or require additional information, please contact Mr. Thomas Elwood, Supervising Engineer, Regulatory Affairs and Licensing at 3 14-225-1905.

Sincerely, Roger C. Wink Manager, Regulatory Affairs JWK/mls 8315 County Road 459 : Steedman, MO 65077 : AmerenMissouri.com

ULNRC-06548 November 18, 2019 Page2of3 Enclosure cc: Mr. Scott A. Morris Regional Administrator U. S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman,MO 65077 Mr. L. John Klos Project Manager, Callaway Plant Office ofNuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 09E3 Washington, DC 20555-000 1

ULNRC-06548 November 18, 2019 Page 3 of 3 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 6100 Western Place, Suite 1050 FortWorth,TX 76107 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Electronic distribution for the following can be made via Other Situations ULNRC Distribution:

F. M. Diya T. E. Herrmann B. L. Cox F. J. Bianco S. P. Banker R. C. Wink T. B. Elwood NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Piftman LLP)

Missouri Public Service Commission Ms. Katie Jo Wheeler (DNR)

Enclosure to U LN RC-06548 Special Report 2019-03 Requirement Callaway Plant s Final Safety Analysis Report (FSAR) Section 16.3 .3 .5 specifies functionality requirements for the reactor coolant system (RCS) loose parts detection instrumentation. The limiting condition for operation (LCO) specified per FSAR 16.3.3.5 requires loose parts detection system channels to be functional in MODES 1 and 2. Specifically, with a required channel inoperable for more than 30 days, action A applies, which states, With one or more Loose-Part Detection System channels non-functional for more than 30 days, prepare and submit a Special Report to the Commission within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel(s) to FUNCTIONAL status.

Cause of the Loose-Parts Detection Instrument Non-Functionality Channel 3 of the loose-parts detection system, which monitors the reactor vessel head, was declared non-functional and removed from service on October 10, 2019. Leading up to channel 3 being declared non-functional, several alarms were generated from channel 3 When the logs were reviewed, it was discovered that channel 3 had been recording multiple events on a daily basis. Each event was recorded as an impact on the system, even if it did not cross the alarm threshold. The vendor reviewed the data and determined that the issue was external to the reactor vessel head and that these events were not internal impacts. Due to recording of events that did not reach the alarm threshold, channel 3 was declared non-functional.

Plans for Restoring the Channel to Functional Status Returning the system to functionality is planned for the next refuel outage (October 2020). The vendor will be on-site to help troubleshoot, recalibrate, and if necessary replace instrumentation to resolve the issues with channel 3 This will bring channel 3 into alignment and restore it to functional status, which is expected to occur by December 1 2020. Channel 4 of the loose-parts detection system, which also monitors the reactor vessel head, is currently functional.