05000443/LER-2005-007, Re Noncompliance with the Technical Specifications Due to Circuit Card Failure
| ML052500412 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/31/2005 |
| From: | St.Pierre G Florida Power & Light Energy Seabrook |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| SBK-L-05171 LER 05-007-00 | |
| Download: ML052500412 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2) 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)(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 |
| 4432005007R00 - NRC Website | |
text
I FPL Energy Seabrook Station FPL Energy Seabrook Station P.O. Box 300 Seabrook, NH 03874 (603) 773-7000 AUG 3 1 MO5 Docket No. 50-443 SBK-L-05171 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Seabrook Station Licensee Event Report (LER) 2005-007-00 for Noncompliance with the Technical Specifications Due to Circuit Card Failure Enclosed is Licensee Event Report (LER) 2005-007-00. This LER reports an event that occurred at Seabrook Station on July 7, 2005. This event is being reported pursuant to the requirements of 10 CFR 50.73(a)(2)(i)(B) and 10 CFR 50.73(a)(2)(v)(D).
Should you require further information regarding this matter, please contact Mr. James M.
Peschel, Regulatory Programs Manager (603) 773-7194.
Very truly yours, FPL ENERGY SEABROOK, LLC A
Gene F. St. Pierre Site Vice President cc:
S. J. Collins, NRC Region I Administrator V. Nerses, NRC Project Manager, Project Directorate 1-2 G. T. Dentel, NRC Senior Resident Inspector an FPL Group company
ENCLOSURE TO SBK-L-05171
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06130/2007 6-2004)
, the NRC may digits/characters for each block) and a person is not required to respond to. the
- 3. PAGE Seabrook Station 05000 443 1 OF 4
- 4. TITLE Noncompliance with the Technical Specifications Due to Circuit Card Failure
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED S I FACILrTY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR N/A 05000 F ACILITY NAME DOCKET NUMBER 07 07 2005 2005 - 007 -
00 08 31 2005 N/A 05000
- 9. OPERATING MODE 11 THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check al that apply)
O 20.2201(b) 0 20.2203(a)(3)(i) 0 50.73(a)(2)(i)(C) 0 50.73(a)(2)(vii) 10 20.2201(d) 0 20.2203(a)(3)(ii) 0 50.73(a)(2)(0i)(A).
D 50.73(a)(2)(viii)(A) o 20.2203(a)(1)
El 20.2203(a)(4) 0 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
C_ 20.2203(a)(2)(i) a 50.36(c)(1)(l)(A) a 50.73(a)(2)(iil)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL 0
20.2203(a)(2)(ii) 0 50.36(c)(1)(ii)(A) 0 50.73(a)(2)(iv)(A) 0 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
E 50.73(a)(2)(v)(A),
El 73.71(a)(4) o 20.2203(a)(2)(iv) 0 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)'
E 73.71 (aX5) 100 0
20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C) 0 OTHER o 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B) 0 50.73(a)(2)(v)(D)
Specify in Abstract below 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) (17)
This event had no adverse impact on the plant or on the health and safety of the public. No plant transients, systems actuations, or consequences resulted from this event. This event did involve a Safety System Functional Failure because the onsite emergency power system (both EDGs), a safety function that is separate from offsite power, was unavailable for approximately 31 minutes on May 10, 2005. Also, both CBS spray pumps were inoperable for approximately four hours during the event. Nonetheless, a risk review determined that this event was of minimal risk significance, having no impact on core damage frequency or large early release frequency.
EDG-B remained capable of sequencing loads, other than CBS pump-B, on the emergency bus as designed. CBS pump-B remained functional for containment performance considerations since it would start at 52 seconds.
Further, the emergency operating procedures contain sufficient guidance that directs the operators to manually start the CBS pumps as required. This is not a time critical step since Seabrook Station containment pressure capacity is in excess of 165 psig. No other inoperable structures, systems, or components contributed to the event.
IV. Corrective Actions
The corrective actions taken for this event included replacing the failed circuit card in the train-B EPS and implementing a daily EPS monitoring plan. To allow prompt identification of an EPS failure, the EPS monitoring plan has the operators verify proper EPS light indications and alarm status on a daily frequency.
A review of the failure concluded that the extent of condition was limited to only the train-B EPS. An inspection of the train-A EPS found no abnormal indications. Further, no new circuit cards had recently been installed in the train-A EPS; therefore, it was not susceptible to experiencing a similar premature failure of a circuit card.
V. Additional Information
The Energy Industry Identification System (EHS) codes are included in this LER in the following format:
[EIIS system identifier, EUS component identifier].
Similar Events
Seabrook Station has experienced no other confirmed relay driver circuit board failures in the last five years.
Manufacturer Data The emergency power sequencers used at Seabrook Station were manufactured by Vitro Laboratories, a division of Automation Industries, Inc. The card that failed is Vitro part number 0423-2797-2.