ULNRC-06708, Special Report 2022-01, Non-Functionality of Loose Parts Monitoring Channel for Greater than 30 Days

Special Report 2022-01, Non-Functionality of Loose Parts Monitoring Channel for Greater than 30 Days

ML22011A137
Person / Time
Site:	Callaway
Issue date:	01/11/2022
From:	Meyer S Ameren Missouri
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06708 SR-2022-01
Download: ML22011A137 (4)

Text

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Callaway Plant MISSOURI January 11, 2022 ULNRC-06708 u.s Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-000 1 10 CFR 50.4 Ladies and Gentlemen:

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

RENEWED FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 2022-0 1 NON-FUNCTIONALITY OF LOOSE PARTS MONITORING CHANNEL FOR GREATER THAN 30 DAYS Enclosed is a special report addressing the non-functionality of a loose parts monitoring channel at Callaway Plant.

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

If there are any questions, please contact Tom Elwood, Supervising Engineer, Regulatory Affairs and Licensing at 314-225-1905.

Sincerely, Steve J. Meyer Manager, Regulatory Affairs Enclosure 83 15 County Road 459 Steedman, MO 65077 AmerenMissouri.com

ULNRC-06708 January 1 1 2022 Page 2 of 3 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. M. Chawla Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O8B1A Washington, DC 20555-0001

ULNRC-06708 January 11, 2022 Page 3 of 3 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 6500 West Freeway, Suite 400 Fort Worth, TX 76116 t 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 Responses and Reports ULNRC Distribution:

F. M. Diya B. L. Cox F. J. Bianco S. P. Banker B. L. Jungrnann M. A. McLachlan K. A. Mills S. J. Meyer R. C. Wink T. B. Elwood M. W. Dancer NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittrnan LLP)

Enclosure ULNRC-06708 Special Report 2022-01 Requirement Callaway Plants Final Safety Analysis Report (FSAR), Section 1 6.3 .3 .5, specifies functionality requirements for the reactor coolant system (RCS) loose parts detection instrumentation. The Limiting Condition for Operation (LCO) specified per FSAR 1 6.3 .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 Monitoring Instrument Non-Functionality Channel 3, one oftwo redundant loose-parts monitoring channels for the reactor vessel head, was declared non-functional and removed from service on December 6, 202 1 due to excessive nuisance alarms from conservative setpoints for alanri thresholds.

Plans for Restoring the Channel to Functional Status Restoration of Channel 3 of the loose-parts monitoring system will require plant data to be collected and transmitted to the equipment vendor for analysis. The vendor will provide new threshold values required to restore the channel to functionality. Channel 4 of the loose-parts monitoring system, which also monitors the reactor vessel head, is currently functional.