05000483/LER-2021-001, Manual Actuation of Essential Service Water System

Manual Actuation of Essential Service Water System

ML21098A254
Person / Time
Site:	Callaway
Issue date:	04/08/2021
From:	Bianco F Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06640 LER 2021-001-00
Download: ML21098A254 (7)

LER-2021-001, Manual Actuation of Essential Service Water System

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)
4832021001R00 - NRC Website

text

Callaway Plant MISSOURI April 08, 2021 ULNRC-06640 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.73 Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC COMPANY RENEWED FACILITY OPERATING LICENSE NPF-30 LICENSEE EVENT REPORT 2021-001-00 MANUAL ACTUATION OF ESSENTIAL SERVICE WATER SYSTEM The enclosed licensee event report is submitted in accordance with 10 CFR 50.73(a)(2)(iv)(A) to report an event or condition that resulted in a manual actuation ofthe essential service water system.

This letter does not contain any new commitments.

Frederick Bianco Senior Director, Nuclear Operations

Enclosure:

LER 202 1-001-00 8315 County Road 459 Steedman, MO 65077 AmerenMissouri.com

ULNRC-06640 April 08, 2021 Page 2 of 3 cc:

Mr. Scoff 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 ofNuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O8B1A Washington, DC 20555-0001

ULNRC-06640 April 08, 2021 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 (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 Tech Spec ULNRC Distribution:

F. M. Diya B. L. Cox F. J. Bianco S. P. Banker S. J. Meyer T. B. Elwood Corporate Oversight N$RB Secretary Performance Improvement Coordinator STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittman LLP)

Missouri Public Service Commission

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 0813112023 (08-2020)

Esmated burden per response to comply with this mandatory collection request 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />. Reported LIC E N S E E EVE NT REP0RT LE R learned are incorporated into the licensing process and fed back to industry. Send comments I

t I

regarding burden esbmate to the FOPA, Library, and Information Collections Branch (T-6 A1OM), U.S.

(See Page 3 for required number of digitslchamcters for each block)

Nuclear Regulatori Commission, Washington, DC 20555-0001, or by e-mail to lntscollects.Resourcenrc.gov, and the 0MB reviewer at 0MB Office of Informabon and Regulatory (See NUREG-1022, R.3 for instruction and guidance for completing this form

Affairs, (3150-0104),

AUn:

Desk au: oira_submission(ffiomb.eon.gov.

The NRC may not conduct or hftps:llwww.nrc.qovlreading-rrnldoc-collections/nureqslstafflsrl022/r3/)

alorn unless the document

3. Page Callawav Plant. Unit No. I 05000483 1 OF 4

4. Title Manual Actuation of Essential Service Water System

5. Event Date

6. LER Number

7. Report Date

8. Other Facilities Involved Facility Name Docket Number Month Day Year Year SIUfltI5I Revision Month Day Year 5000

Facility Name Docket Number 02 09 2021 2021

- 001 00 04 08 2021 osooo L Operafing Mode

10. Power Level MODE3 000

11. This RepOrtiS Submitted Pursuanttothe Requiremenis oflO CFR:

(Check all that apply)

I 0 CFR Part 20 D

20.2203(a)(2)(vi)

E 50.36(c)(2) 50.73(a)(2)(iv)(A) 50.73(a)(2)(x)

LI 20.2201 (b) 20.2203(a)(3)(i)

U 50.46(a)(3)(ii) 50.73(a)(2)(v)(A)

I 0 CFR Part 73 El 20.2201(d)

E 20.2203(a)(3)(ii)

El 50.69(g) fl 50.73(a)(2)(v)(B)

El 73.71(a)(4)

D 20.2203(a)(1)

LI 20.2203(a)(4) 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(C) 73.71(a)(5)

El 20.2203(a)(2)(i) 10 CFR Part 21 El 50.73(a)(2)(i)(B)

El 50.73(a)(2)(v)(D)

E 73.77(a)(1)Q)

El 20.2203(a)(2)(H) fl 21.2(c)

E 50.73(a)(2)(i)(C) fl 50.73(a)(2)(vii)

El 73.77(a)(2)(i) 20.2203(a)(2)(iii) 10 CFR Part 50 E

50.73(a)(2)(ii)(A)

E 50.73(a)(2)(viii)(A)

E1 73.77(a)(2)(ii)

LI 20.2203(a)(2)(iv) 50.36(c)(1)(i)(A)

El 50.73(a)(2)(ii)(B)

El 50.73(a)(2)(viii)(B)

El 20.2203(a)(2)(v) 50.36(c)(1)(ii)(A) 50.73(a)(2)(iii)

E 50.73(a)(2)Qx)(A)

LI Other (Specify here, in Abstract, or in NRC 366A).

12. Licensee Contactforthis LER icensee Contact hone Number (Indude Area Code) r. B. Elwood, Supervising Engineer, Regulatory Affairs and LiCensing 314-225-1 905

13. Complete One lineforeach ComionentFaiIure Descdbed inthis Repoit

Cause

System Component Manufacturer Reportable To IRIS

Cause

System Component Manufacturer Reportable To IRIS

14. Supplemental Report Expected Month Day Year

15. Expected Submission Date No D Yes (lfyes, complete 15. Expected Submission Date)

16. Absfract(Umftto 1560 spaces, i.e., approximately 15 single-spaced typewritten lines)

On February 9, 2021

, at 0838 operators commenced placing both trains of Essential ServiCe Water (ESW) in manual alignments in accordance with annunciator response procedure OTA-RK-00014, Addendum 12A, ServiCe Water Pump Lockout. The manual actuation of ESW was in response to a condition where two non-safety Service Water (SW) pumps ripped and locked out due to low lubrication (lube) water pressure.

the cause of the trips and subsequent lockouts of the A and B SW pumps was attributed to low lube water pressure caused by fouling of the lube water Y-strainers. The fouling occurred since the normal weekly backflush of the Y-strainers could not be performed while a temporary alteration in support of maintenance (TASM) was installed in order to repair a leak in the permanent lube water piping. Preventive Maintenance (PM) tasks had not been initiated prior to the event to periodically clean the Y-strainers in order to compensate for the inability to backflush.

rhe initial corrective action taken in response to the event was cleaning of the Y-strainers in the lube water piping.

In addition, PM tasks were created to clean the Y-strainers on a weekly basis for the remaining time that the TASM was installed.

The permanent corrective action was to complete a modification to replace the section of the common lube vater piping where the leak occurred.

Both trains of ESW were returned to standby alignments on February 9, 2021 at I 140.

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