05000483/LER-2020-007, Re B Pressurizer PORV Inoperable Due to Nonconformance with EQ Requirements

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Re B Pressurizer PORV Inoperable Due to Nonconformance with EQ Requirements
ML20366A103
Person / Time
Site: Callaway Ameren icon.png
Issue date: 12/31/2020
From: Bianco F
Ameren Missouri
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06627 LER 2020-007-00
Download: ML20366A103 (7)
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LER-2020-007, Re B Pressurizer PORV Inoperable Due to Nonconformance with EQ Requirements
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4832020007R00 - NRC Website
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text

Ameren MISSOURI December 3 1, 2020 Callaway Plant U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Ladies and Gentlemen:

ULNRC-06627 10 CFR 50.73 DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC COMPANY RENEWED FACILITY OPERATING LICENSE NPF-30 LICENSEE EVENT REPORT 2020-07-00 B PRESSURIZER PORV INOPERABLE DUE TO NONCONFORMANCE WITH EQ REQUIREMENTS The enclosed license event report is submitted in accordance with 10 CFR 50.73(a)(2)(i)(B) to report a condition or operation prohibited by Technical Specifications.

This letter does not contain any new commitments Enclosure LER 2020-007-00 5:

kD co Senior Director, Nuclear Operations

$315 County Road 459 Steedman, MO 65077 t

AmerenMissouri.com Frederick Bianco

ULNRC-06627 December 3 1, 2020 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 ofNuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O8B1A Washington, DC 20555-0001 p_ w--:.-

T1 w

ULNRC-06627 December 31, 2020 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 Tech Spec ULNRC Distribution:

F. M. Diya B. L. Cox F. 3. Bianco S. P. Banker R. C. Wink T. B. Elwood Corporate Oversight NSRB Secretary Performance Improvement Coordinator STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittman LLP)

Missouri Public Service Commission 1

I.

I U W II V

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

1. FacilityName
2. Docket Number
3. Page Callawav Plant Unit No. I 05000-483 1 OF 4
4. Title B Pressurizer PORV Inoperable Due to Nonconformance with EQ Requirements
5. Event Date
6. LER Number
7. ReportDate
8. Other Facilities Involved S

I Facility Name Docket Number Month Day Year Year Revision Month Day Year oiooo Facility Name Docket Number 11 02 2020 2020

- 007-00 12 31 2020

. OperatlngMode

10. Power Level 6

0%

)

I 6. Abstract (Limitto 1560 spaces, i.e., approximately 1 5 single-spaced typewrftten lines)

Yhile performing maintenanCe activities on November 2, 2020 during Refueling Outage 24, the as-found Condition of the B power operated relief valve (PORV) was found to be nonconforming with respect to the requirements of the nvironmental qualification (EQ) program. Specifically for the valve operator power cabling, the CONAX midlock ferrule was iot crimped to the feedthru sheath. The CONAX body, midlock ferrule and feedthru sheath provide the EQ seal when the errule is crimped to the sheath. The pressurizer PORVs are credited to mitigate accident sequences that could result in adverse containment environments.

Engineering evaluation of the as-found condition of the B PORV found that past operability could not be supported and hat the as-found condition had likely existed for a long period of time, possibly since initial plant startup. Evaluation of the as-found condition found that the condition was not safety significant, due in part to the fact that the A PORV was confirmed to not have the same condition.

The cause for the improper connection seal was that the midlock was not torqued correctly. The CONAX connector for the B PORV was reterminated and torqued to the manufacturers specified value to ensure a proper seal for the valve operator.

This LER is being submitted to report a condition or operation prohibited by Technical Specification 3.4.1 1, Pressurizer Power Operated Relief Valves (PORVs).

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