05000285/LER-2012-018-01, Regarding Containment Air Cooling Units Not Properly Tested During Cycle 26

Regarding Containment Air Cooling Units Not Properly Tested During Cycle 26

ML13129A258
Person / Time
Site:	Fort Calhoun
Issue date:	05/08/2013
From:	Cortopassi L Omaha Public Power District
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
LIC-13-0012 LER 12-018-01
Download: ML13129A258 (5)

LER-2012-018, Regarding Containment Air Cooling Units Not Properly Tested During Cycle 26

Event date:
Report date:
Reporting criterion:	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)(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)(v), Loss of Safety Function
2852012018R01 - NRC Website

text

--

-~

--.PP.

om.PublicPowerDlBlltcl 444 South 16h Street Mall Chnaha, lVE 68102-2247 LlC-13-0012 May 08,2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Reference: Docket No. 50-285

Subject:

Licensee Event Report 2012-018, Revision 1, for the Fort Calhoun Station Please find attached Licensee Event Report 2012-018, Revision 1, dated May 08, 2013.

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

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.

Louis P. Cortopassi Site Vice President and CNO LPC/epm/rjr Attachment c:

A. T. Howell, NRC Regional Administrator, Region IV J. M. Sebrosky, NRC Project Manager L. E. Wilkins, 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 4

4. TITLE Containment Air Cooling Units Not Properly Tested during Cycle 26

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 07 27 2012 2012 018 -

1 05 08 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

SAFETY SIGNIFICANCE

For the limiting loss of coolant accident, one of the two CACFS trains, comprised of one containment air cooling and filtering unit and one containment air cooling unit, would limit the containment pressure to below the design value without taking credit for the cooling capacity of the containment spray system. For the limiting main steam line break accident, a heat removal contribution is credited from the air coolers and the containment spray system in the mitigation of containment peak pressure.

License Amendment No. 255 did not result in any physical changes to, or accident response of, the system. The testing performed in 2009 demonstrated that more than the minimum air flow would be developed and that adequate cooling flow would have resulted. Excessive air flow could result in increased diesel generator loading and increased fuel consumption affecting the mission time due to increased motor amps. Several performances of OP-ST-VA-008, Containment Ventilation System Containment Fans Exercise Test, performed during cycle 26 were reviewed to verify acceptable motor amps. As stated in the corrective actions, an acceptable test performance is a Mode restraint for the next start-up.

SAFETY SYSTEM FUNCTIONAL FAILURE This event does not result in a safety system functional failure in accordance with NEI-99-02.

PREVIOUS EVENTS Eight LERs with event dates since January 1, 2010, were identified with the same reporting criteria; 10 CFR 50.73(a)(2)(i)(B), Any operation or condition which was prohibited by the plant's Technical Specifications, None of the LERs reviewed contained the same underlying concern or reason of this event, such as the same root cause, failure, or sequence of events.