05000285/LER-2013-008, The Fort Calhoun Station, Previously Installed GE Iav Relays Failed Seismic Testing

The Fort Calhoun Station, Previously Installed GE Iav Relays Failed Seismic Testing

ML13158A138
Person / Time
Site:	Fort Calhoun
Issue date:	06/07/2013
From:	Cortopassi L Omaha Public Power District
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
LIC-13-0075 LER 13-008-00
Download: ML13158A138 (4)

LER-2013-008, The Fort Calhoun Station, Previously Installed GE Iav Relays Failed Seismic Testing

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function 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)(ix)(A) 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)(i)(B), Prohibited by Technical Specifications
2852013008R00 - NRC Website

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Omaha Public Power District 444 South 16th Street Mall Omaha, NE 68102-2247 LlC-13-0075 June 7,2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Reference: Docket No. 50-285

Subject:

Licensee Event Report 2013-008, Revision 0, for the Fort Calhoun Station Please find attached Licensee Event Report 2013-008, Revision 0, dated June 7,2013.

This report is being submitted pursuant to 10 CFR 50.73(a)(2)(v).

There are no new commitments being made in this letter.

If you should have any questions, please contact Terrence W. Simpkin, Manager, Site Regulatory Assurance, at (402) 533-6263.

I::: uis P. Cortopassi Site Vice President and CNO LC/epm/rjr Attachment c:

A. T. Howell, NRC Regional Administrator, Region IV L. E. Wilkins, NRC Project Manager J. M. Sebrosky, NRC Project Manager J. C. Kirkland, NRC Senior Resident Inspector Employment with Equal Opportunity

NRC FORM 366 (10-2010)

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (10-2010)

LICENSEE EVENT REPORT (LER)

(See reverse for required number of digits/characters for each block)

APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013

, the NRC may not conduct or sp onsor, and a person is not required to respond to, th e

information collection.

1. FACILITY NAME Fort Calhoun Station

2. DOCKET NUMBER 05000285

3. PAGE 1 OF 3

4. TITLE Previously Installed GE IAV Relays Failed Seismic Testing

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.

MONTH DAY YEAR FACILITY NAME DOCKET NUMBER 05000 4

11 2013 2013 008 -

0 06 07 2013 FACILITY NAME DOCKET NUMBER 05000

9. OPERATING MODE 5

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 20.2201(b) 20.2203(a)(3)(i) 50.73(a)(2)(i)(C) 50.73(a)(2)(vii) 20.2201(d) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A) 50.73(a)(2)(viii)(A) 20.2203(a)(1) 20.2203(a)(4) 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B) 20.2203(a)(2)(i) 50.36(c)(1)(i)(A) 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A) 20.2203(a)(2)(ii) 50.36(c)(1)(ii)(A) 50.73(a)(2)(iv)(A) 50.73(a)(2)(x) 20.2203(a)(2)(iii) 50.36(c)(2) 50.73(a)(2)(v)(A) 73.71(a)(4) 20.2203(a)(2)(iv) 50.46(a)(3)(ii) 50.73(a)(2)(v)(B) 73.71(a)(5) 20.2203(a)(2)(v) 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(C)

OTHER 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(v)(D)

Specify in Abstract below or in LICENSEE EVENT REPORT (LER)

CONTINUATION SHEET In the case of relay 27-1/1A3, a ground alarm would be received and the under voltage circuit would be inoperable. This would have prevented the load shedding of safeguard loads and non-safeguards loads. Diesel generator DG-1 would not have started.

In the case of relay 27-1/1A3-13, a ground alarm would be received and under voltage circuit would be inoperable. This would cause relays 27T1X/1A3-13 and 27T2X/1A3-13 not to energize to perform their tripping functions.

In the case of relay 27-1/1B4B, an internal short in the relay causes a ground condition.

The 125VDC circuit is an ungrounded system, the ground will cause an alarm but the fuse should not open. A ground alarm would be received on the 125VDC system. This impacts vacuum deaerator circulating pump, DW-46B and indication. The 1B4B circuit would be inoperable and breaker 1B4B-8 for DW-46B would be prevented from tripping on a low voltage condition.

Cumulatively, the seismic event would have impacted relays on both the 1A3 and 1A4 buses preventing load shedding functions as well as the starting of diesel generators DG-1 and DG-

2.

SAFETY SYSTEM FUNCTIONAL FAILURE This event does result in a safety system functional failure in accordance with NEI-99-02.

PREVIOUS EVENTS None