05000331/LER-2015-001, Both Doors in Secondary Containment Airlock Opened Concurrently
| ML15139A270 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 05/15/2015 |
| From: | Vehec T NextEra Energy Duane Arnold |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-15-0132 LER 15-001-00 | |
| Download: ML15139A270 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 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 |
| 3312015001R00 - NRC Website | |
text
NEx~era EN ERGYý04 ARNOLD May 15, 2015 NG-1 5-0132 10 CFR 50.73 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 Duane Arnold Energy Center Docket 50-331 Renewed Op. License No. DPR-49 Licensee Event Report #2015-001 Please find attached the subject report submitted in accordance with 10 CFR 50.73. This letter makes no new commitments or changes to any existing
commitments
T. A. Vehec Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC cc:
Administrator, Region III, USNRC Project Manager, DAEC, USNRC Resident Inspector, DAEC, USNRC NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA 52324
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 01131/2017 (02-2014)
Estimated 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 lessons learned are incorporated into the licensing process and fed back to industry.
Send comments regarding burden estimate to the FOIA, Privacy and Information Collections LC S E V N R PBranch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to lnfocollects.Resource@nrc.gov, and to the Desk Officer, Office of Information and (See Page 2 for required number of Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC e for each b'ock 20503. If a means used to impose an information collection does not display a currently valid OMB digits/characters fcontrol number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Duane Arnold Energy Center 05000-331 1 OF 3
- 4. TITLE Both Doors in Secondary Containment Airlock Opened Concurrently
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED I
FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR NUMBER NO.
[/
N/A FACILITY NAME DOCKET NUMBER 03 21 2015 2015 -
001 00 05 15 2015 N/A N/A
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
E] 20.2201(b)
E] 20.2203(a)(3)(i)
[E 50.73(a)(2)(i)(C)
E] 50.73(a)(2)(vii)
LI 20.2201(d)
El 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A)
El 50.73(a)(2)(viii)(A)
LI 20.2203(a)(1)
[I 20.2203(a)(4)
[E 50.73(a)(2)(ii)(B)
EL 50.73(a)(2)(viii)(B)
LI 20.2203(a)(2)(i)
LI 50.36(c)(1)(i)(A)
LI 50.73(a)(2)(iii)
LI 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL LI 20.2203(a)(2)(ii)
[1 50.36(c)(1)(ii)(A)
LI 50.73(a)(2)(iv)(A)
L] 50.73(a)(2)(x)
[j 20.2203(a)(2)(iii)
LI 50.36(c)(2)
LI 50.73(a)(2)(v)(A)
LI 73.71(a)(4)
%] 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
LI 50.73(a)(2)(v)(B)
LI 73.71(a)(5) 100%
L] 20.2203(a)(2)(v)
LI 50.73(a)(2)(i)(A)
[
50.73(a)(2)(v)(C)
LI OTHER L 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(v)(g)
Specify in Abstract below or in This event did not result in a safety system functional failure. There were no automatically or manually initiated safety system responses.
III.
Cause of Event
A Root Cause Evaluation is currently being conducted and when completed, a Supplemental Report will be submitted detailing the cause(s) and corrective action(s) for this event.
IV.
Corrective Actions
An operational check of the Secondary Containment door interlocks is performed monthly via STP 3.6.4.1-02, Secondary Containment Airlock Verification. A Root Cause Evaluation is currently being conducted and when completed, a Supplemental Report will be submitted detailing the cause(s) and corrective Action(s) for this event.
V.
Additional Information
Previous Similar Occurrences:
A review of DAEC Licensee Event Reports from the past 5 years identified three similar occurrences, reference LER 2013-006, LER 2014-002 and LER 2014-003.
A review of the corrective action program identified additional occurrences of airlock conditions causing momentary secondary containment inoperability - seven additional occurrences in the past two years, with two of those occurring in the last year.
EIIS System and Component Codes:
IEL Interlock Reportinq Requirements:
This event is being reported as an event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material, 10CFR50.73(a)(2)(v)(C).