05000285/LER-2013-009, Regarding Tornado Missile Vulnerabilities

Regarding Tornado Missile Vulnerabilities

ML13168A376
Person / Time
Site:	Fort Calhoun
Issue date:	06/14/2013
From:	Cortopassi L Omaha Public Power District
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
LIC-13-0084 LER 13-009-00
Download: ML13168A376 (4)

LER-2013-009, Regarding Tornado Missile Vulnerabilities

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(8) 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 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
2852013009R00 - NRC Website

text

LlC-13-0084 June 14, 2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Reference: Docket No. 50-285

Subject:

Licensee Event Report 2013-009, Revision 0, for the Fort Calhoun Station Please find attached Licensee Event Report 2013-009, Revision O. This report is being submitted pursuant to 10 CFR 50.73{a)(2)(v) and 10 CFR 50.73(a)(2)(i)(8). There are no 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.

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

A. T. Howell, NRC Regional Administrator, Region IV J. M. Sebrosky, NRC Sr. Project Manager L. E. Wilkins, NRC Project Manager J. C. Kirkland, NRC Sr. 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 sponsor, and a person is not required to respond to, the information collection.

1. FACILITY NAME Fort Calhoun Station

2. DOCKET NUMBER 05000285

3. PAGE 1 OF 3

4. TITLE Tornado Missile Vulnerabilities

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

16 2013 2013 009 -

0 06 14 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

2. 10 CFR 50.73(a)(2)(i)(B): any operation or condition which was prohibited by the plant's Technical Specifications.

CONCLUSION As discussed above, these additional interactions do not appear to be a result of plant modifications as was the case with the control room air handlers. These additional interactions appear to have existed since initial licensing. Some of the interactions had inappropriately been considered acceptable using probabilistic analysis.

CORRECTIVE ACTIONS

The station is performing extent of condition reviews associated with LER 2013-005-0. The station will determine the scope and resolutions to mitigate the currently identified interactions as well as any additional interactions prior to plant restart.

SAFETY SIGNIFICANCE

During a tornado strike, it is expected that one or more pieces of equipment identified during the extent of condition required for safe shutdown, mitigation of the consequences of an accident, control the release of radioactive material, or remove residual heat may become unavailable. The duration of the event (tornado strike) would be of a short duration.

However, the duration of the resulting conditions would be expected to persist from a few hours to several days. Redundancy of equipment, such as a third diesel engine driven auxiliary feedwater pump, broadens the mitigation responses available.

SAFETY SYSTEM FUNCTIONAL FAILURE This event does result in a safety system functional failure in accordance with Nuclear Energy institute, NEI-99-02, Regulatory Assessment Performance Indicator Guideline, Revision 6.

PREVIOUS EVENTS One previous event, LER 2013-005, was identified. It was the extent of condition from the event identified in LER 2013-005 that lead to the current LER. The conditions identified in the current LER are legacy issues that could not have been prevented or corrected by the actions taken or planned in LER 2013-005.