ULNRC-06441, SR 2018-02-00 for Callaway Plant, Unit 1, Non-Functionality of an Accident Monitoring Instrument for Greater than 30 Days

SR 2018-02-00 for Callaway Plant, Unit 1, Non-Functionality of an Accident Monitoring Instrument for Greater than 30 Days

ML18156A186
Person / Time
Site:	Callaway
Issue date:	06/05/2018
From:	Wink R Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06441 SR 2018-02-00
Download: ML18156A186 (4)

Text

Am MISSOURI eren Callaav Plant June 5.2018 U LNRC-0644 1 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Ladies and Gentlemen:

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

RENEWED FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 2018-02:

NON-FUNCTIONALITY OF AN ACCIDENT MONITORING INSTRUMENT FOR GREATER THAN 30 DAYS Enclosed is a special report addressing the non-fttnctionality of an accident monitoring instrument at the Caflaway plant.

No new commitments are identified in this correspondence. and none of the material in the 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 314-225-1905.

Sincerely, Wink Manager, Regulatory Affairs Enclosure P.O. Box 620 fulton, MO 6525 AmerenMissouri.com

ULNRC-0 6441 June 05, 201$

Page 2 of3 cc: Mr. Kriss M. Kennedy 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

$201 NRC Road Steedman, MO 65077 Mr. L. John Kios Project Manager, Call away Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O9E3 Washington, DC 20555-0001

ULNRC-0644 I June 05. 2018 Page3 of3 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 6100 Western Place, Suite 1050 Fort Worth, 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. Henmann B. L. Cox S. P. Banker R. C. Wink T. B. Elwood Corporate Communications NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbciry Winthrop Shaw Pittman LLP)

Missouri Public Service Commission

Enclosure to ULNRC-06441 Page lof 1 Special Report 2018-02 Requirement Callaway Plants Final Safety Analysis Report (FSAR) Section 16.3.3.4 contains requirements for accident monitoring instrumentation. Specifically, the accident monitoring instrumentation channels shown in Table 16.3-7 are required to be FUNCTIONAL in MODES 1, 2, and 3. Action A of FSAR section 16.3.3.4 states, With the number of FUNCTIONAL accident monitoring instrumentation channels less than the Total Number of Channels shown in Table 16.3-7, restore the nonfunctional channel(s) to FUNCTIONAL status within 30 days or prepare and submit a Special Report to the Commission within the following 14 days, outlining the preplanned alternate method of monitoring, the cause of the non-functionality, and the plans and schedule for restoring the channels to FUNCTIONAL status.

Background

During the performance of routine calibration testing on 04/23/18 to perform a zero and span check on GSAIOO1O, Containment Hydrogen Concentration Train B Analysis Indicator, the analyzer response was not as expected. The output of the unit was slow to respond following the application of span gas, and subsequent investigations determined that the unit continued to experience operational concerns.

Alternate Monitoring Plans Alternate train indicator GSAIOO19, Containment Hydrogen Concentration Train A Analysis Indicator, is being monitored, and it is currently providing (or capable of providing) reliable indication of containment hydrogen concentration.

Cause of the NON-FUNCTIONALITY of the B hydrogen analyzer Troubleshooting is currently ongoing per job 18001773, Investigate GSAIOO1O not Responding Properly During Zero and Span Check. At this time, however, the cause of the NON-FUNCTIONALITY of the B hydrogen analyzer has not been determined.

Plans and Schedule for Restoring the Instrument to FUNCTIONAL status Plans for restoring the Instrument to FUNCTIONAL status are to continue troubleshooting activities and then repair the instrument after the cause of failure is known. Investigation is continuing, and repair is planned under sub-tasks to job 18001773. At this time, Callaway Plant expects the Containment Hydrogen Concentration Train B Analysis Indicator to be returned to FUNCTIONAL status by July 31, 2018 contingent on determination of the cause of failure.