05000346/LER-2005-003, Re Containment Electrical Penetration Not Equipped with Backup Electrical Fault Protection
| ML051950254 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/12/2005 |
| From: | Bezilla M FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NP-33-05-003-00 LER 05-003-00 | |
| Download: ML051950254 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii) 10 CFR 50.73(a)(2)(viii)(A) 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 |
| 3462005003R00 - NRC Website | |
text
FENOC FirstEnergy Nuclear Operating Cornpany 5501 North State Route 2 Oak Harbor. Ohio 43449 Mark B. Bezilla Vice President - Nuclear 419-321-7676 Fax: 419-321-7582 Docket Number 50-346 NP-33-05-003-00 l OCFR50.73 License Number NPF-3 July 12, 2005 United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Ladies and Gentlemen:
LER 2005-003-00 Davis-Besse Nuclear Power Station, Unit No. I Date of Occurrence - May 13, 2005 Enclosed is Licensee Event Report (LER) 2005-003-00, which is being submitted to provide written notification of the discovery of an electrical containment building penetration feeding a containment building lighting panel not equipped with adequate backup electrical fault protection. This event is being reported pursuant to IOCFR50.73(a)(2)(ii)(B) as an unanalyzed condition that significantly degraded plant safety due to the circuit not meeting the single failure criterion as required by the plant's design basis. Immediate notification of this event was made to the Nuclear Regulatory Commission on May 13, 2005, in accordance with IOCFR50.72(b)(3)(ii)(B) (Event Number 41698). Commitments associated with this LER are listed in the Attachment.
Very truly yours, Attachment Enclosure cc:
Regional Administrator, USNRC Region III DB-1 Project Manager, USNRC DB-I NRC Senior Resident Inspector Utility Radiological Safety Board
Docket Number 50-346 License Number NPF-3 NP-33-05-003-00 Attachment Page 1 of 1 COMMITMENT LIST The following list identifies those actions committed to by the Davis-Besse Nuclear Power Station in this document. Any other actions discussed in the submittal represent intended or planned actions by Davis-Besse. They are described only as information and are not regulatory
commitments
Please notify the Manager - Regulatory Compliance (419-321-8585) at Davis-Besse of any questions regarding this document or associated regulatory commitments.
COMMITMENTS
DUE DATE
- 1. Modifications will be made to install the required backup fault protection for the circuit supplying containment electrical penetration PBP5D, or the circuit will be procedurally de-energized during normal plant operations.
- 2. The database and associated design drawings will be revised to reflect the cables associated with the circuit powering lighting panel L49E1.
- 3. The database will also be changed to reflect that lighting circuits passing through containment electrical penetrations require unique numbering as appropriate.
- 1. December 15, 2005
- 2. September 15, 2005
- 3. September 15, 2005
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB NO. 3150-0104 EXPIRES 6/30/2007 (6-2004)
, the NRC may (See reverse for required number of not conduct or sponsor. and a person Is not required to respond to, the digits/characters for each block) kformation collection.
- 3. PAGE Davis-Besse Unit Number 1 05000346 1 OF4
- 4. TITLE Containment Electrical Penetration Not Equipped With Backup Electrical Fault Protection
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED SEQUENTIAJL REV FACILITY NAME DOCKET NUMBER MONTH DAY IYEAR YEAR NUMBER iNEO.
MONTH DAY IYEAR 05000 05 2005 -
003 00 07 12 2005 FACILITY NAME DOCKET NUMBER
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) al 20.2201(b)
D 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C) al 50.73(a)(2)(vii) 1 E 20.2201(d)
E 20.2203(a)(3)(ii)
Dl 50.73(a)(2)(ii)(a)
El 50.73(a)(2)(viii)(A) 0 20.2203(a)(1) 0 20.2203(a)(4)
C 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B) a 20.2203(a)(2)(i)
E 50.36(c)(1)(i)(A)
El 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL E 20.2203(a)(2)(ii)
El 50.36(c)(1)(li)(A) a 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
E 20.2203(a)(2)(iii)
Ea 50.36(c)(2) al 50.73(a)(2)(v)(A)
El 73.71 (a)(4) 100 El 20.2203(a)(2)(iv)
ED 50.46(a)(3)(ii) al 50.73(a)(2)(v)(B)
El 73.71(a)(5)
E 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
El OTHER Specify In Abstract below 0 20.2203(a)(2)(vi)
E 50.73(a)(2)(i)(B)
E 50.73(a)(2)(v)(D) or In (If more space Is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A)
ANALYSIS OF OCCURRENCE: (Continued)
'Event Reporting Guidelines 10CFR50.72 and 50.73 (Revision 2)," includes an example of an event reportable under this criterion as the discovery that a system required to meet the single failure criterion does not do so. Because it could not be shown that the containment electrical penetration remained capable of fulfilling its intended safety function in the event of a single failure, this condition is being reported under this criterion. Initial notification of this condition was made to the NRC 6n May 13, 2005, in accordance with the eight-hour reporting requirement of 10CFR50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety (Event Number 41698).
CORRECTIVE ACTIONS
The circuit for lighting panel L49E1 was de-energized on March 23, 2005, to remove the possibility of an electrical fault on this circuit that could damage containment electrical penetration PBP5D while further investigation into this issue was underway.
A review was conducted to ensure applicable containment electrical penetration circuits were evaluated for primary and backup fault protection. There were no additional electrical penetration circuits with fault protection deficiencies.
Modifications will be made to install the required backup fault protection for the circuit supplying containment electrical penetration PBP5D, or the circuit will be procedurally de-energized during normal plant operations.
The database and associated design drawings will be revised to reflect the cables associated with the circuit powering lighting panel L49E1. The database will also be changed to reflect that lighting circuits passing through containment electrical penetrations require unique numbering as appropriate.
The causal factors that led to the circuit to be omitted from the calculation occurred at least 20 years ago. Although similar isolated cases of misapplication of input data for engineering products may occur, no changes are warranted to the engineering programs currently in effect.
FAILURE DATA:
DBNPS LER 90-005 documents similar problems with circuit protection for containment electrical penetrations. This LER documented a total of 34 electrical circuits involving five penetrations that did not have backup fault protection, which represented a condition outside the design basis of the plant.
The corrective actions taken In response to the 1990 event would not have prevented this current event because the database and drawing previously used to identify the potentially affected circuits did not uniquely list the circuit for lighting panel L49E1.
Energy Industry Identification System (EIIS) codes are identified in the text as [XX].
NP-33-05-003-00 CRs 2005-01849, 2005-01872, 2005-02761