05000331/LER-2012-006, Regarding Unplanned Inoperability of 2 Average Power Range Monitors

Regarding Unplanned Inoperability of 2 Average Power Range Monitors

ML13031A021
Person / Time
Site:	Duane Arnold
Issue date:	01/30/2013
From:	Richard Anderson NextEra Energy Duane Arnold
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NG-13-0039 LER 12-006-00
Download: ML13031A021 (4)

LER-2012-006, Regarding Unplanned Inoperability of 2 Average Power Range Monitors

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
3312012006R00 - NRC Website

text

January 30, 2013 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 #2012-006-00 NG-13-0039 10 CFR 50.73 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

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ki'(;hard L. And~n Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA 52324

NRC FORM 366 (10-2010)

PRINTED ON RECYCLED PAPER 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 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 Records and FOIA/Privacy Service Branch (T-5 F52), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to infocollects@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202 (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.

1. FACILITY NAME Duane Arnold Energy Center

2. DOCKET NUMBER 05000331

3. PAGE 1 OF 3

4. TITLE Unplanned Inoperability of 2 Average Power Range Monitors

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 N/A DOCKET NUMBER 05000 12 01 12 2012 006 0

01 30 13 FACILITY NAME N/A DOCKET NUMBER 05000

9. OPERATING MODE

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) 1 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)

10. POWER LEVEL 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)

X 50.73(a)(2)(v)(A) 73.71(a)(4) 71%

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)

X 50.73(a)(2)(i)(B) 50.73(a)(2)(v)(D)

VOLUNTARY LER

12. LICENSEE CONTACT FOR THIS LER NAME TELEPHONE NUMBER (Include Area Code)

Robert J. Murrell, Engineering Analyst (319) 851-7900 CAUSE SYSTEM COMPONENT MANU-FACTURER REPORTABLE TO EPIX

CAUSE

SYSTEM COMPONENT MANU-FACTURER REPORTABLE TO EPIX

14. SUPPLEMENTAL REPORT EXPECTED

15. EXPECTED MONTH DAY YEAR X

YES (If yes, complete 15. EXPECTED SUBMISSION DATE)

NO SUBMISSION DATE 3

29 13 ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)

On November 27, 2012 during start up from a recent refueling outage, Local Power Range Monitor (LPRM)32-25A was identified as providing a zero input signal to its associated Average Power Range Monitors (APRMs) C and D. At that time it was believed that there was a blown fuse in LPRM 32-25As circuit card and therefore, the LPRM was considered operable. On December 1, 2012, while operating at 71% power, a different operating crew reviewed the condition and bypassed LPRM 32-25A. After bypassing LPRM 32-25A, indicated reactor power on APRMs C and D increased approximately 4%. At this time, the LPRM was determined to be inoperable. Since the inoperable LPRM was providing inputs to APRMs C and D, Technical Specification (TS) Surveillance Requirement (SR) 3.3.1.1.2 which requires verification of the difference between the APRM channels and calculated power to be within 2% of rated thermal power every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, was not met. Therefore, this event resulted in a condition prohibited by TS. A root cause evaluation is being performed to determine the cause and corrective actions for this event and a supplemental report is expected to be issued by March 29, 2013.

The safety significance of this event was minimized by the fact that the ARPMs C and D remained capable of performing their required safety functions.

(If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)

PRINTED ON RECYCLED PAPER V.

Additional Information

Previous Similar Occurrences:

A review of License Event Reports from the past 5 years did not identify any similar occurrence.

EIIS System and Component Codes:

IG - Incore Monitoring System.

Reporting Requirements

This event is being reported as an Operation or Condition Prohibited by TS, 10CFR50.73(a)(2)(i)(B) and an Event or Condition That Could Have Prevented Fulfillment of a Safety Function, 10CFR50.73(a)(2)(v).