05000316/LER-2012-001, For Donald C. Cook, Unit 2, Regarding Containment Divider Barrier Seal Inoperable During Plant Operation
| ML12152A155 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 05/18/2012 |
| From: | Gebbie J Indiana Michigan Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| AEP-NRC-2012-31 LER 12-001-00 | |
| Download: ML12152A155 (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 |
| 3162012001R00 - NRC Website | |
text
INDIANA MICHIGAN Indiana Michigan Power POWER" One Cook Place Bridgman, MI 49106 A unit ofAmerican Electric Power IndianaMichiganPower.com May 18, 2012 AEP-NRC-2012-31 10 CFR 50.73 Docket No. 50-316 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Donald C. Cook Nuclear Plant Unit 2 LICENSEE EVENT REPORT 316/2012-001-00 CONTAINMENT DIVIDER BARRIER SEAL INOPERABLE DURING PLANT OPERATION In accordance with the criteria established by 10 CFR 50.73, Licensee Event Report System, the following report is being submitted:
LER 316/2012-001-00: "Containment Divider Barrier Seal Inoperable During Plant Operation" There are no commitments contained in this submittal.
Should you have any questions, please contact Mr. Michael K. Scarpello, Regulatory Affairs Manager, at (269) 466-2649.
Sincerely, Joel P. Gebbie Site Vice President RAW/kmh Enclosure c:
J. T. King - MPSC, w/o enclosure S. M. Krawec - AEP Ft. Wayne, w/o enclosure MDEQ - WHMD/RPS, w/o enclosure NRC Resident Inspector C. D. Pederson - NRC Region III P. S. Tam - NRC Washington DC INPO Records Center
NRC Form 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES 10/31/2013 (10-2010)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Donald C. Cook Nuclear Plant Unit 2 05000316 1of 3
- 4. TITLE Containment Divider Barrier Seal Inoperable During Plant Operation
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED SSEUENTIAL REV FACILITY NAME DOCKET NUMBER MONTHEDAY YEAR YEARMONTH DAY YEAR NUMBER NO.
05000 FACILITY NAME DOCKET NUMBER 03 22 2012 2012 001 00 05 18 2012 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
El 20.2201(b)
El 20.2203(a)(3)(i)
[l 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii) 5 El 20.2201(d)
El 20.2203(a)(3)(ii)
[] 50.73(a)(2)(ii)(A)
[l 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
El 20.2203(a)(4)
El 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
El 20.2203(a)(2)(i)
El 50.36(c)(1)(i)(A)
El 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii)
El 50.36(c)(1)(ii)(A)
El 50.73(a)(2)(iv)(A)
[I 50.73(a)(2)(x)
[E 20.2203(a)(2)(iii)
El 50.36(c)(2)
El 50.73(a)(2)(v)(A)
El 73.71(a)(4) 000 El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
H 73.71 (a)(5)
El 20.2203(a)(2)(v)
E]
50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)S OTHER El 202203a)(2(vi)Specify in Abstract below
_ED 20.2203(a)(2)(vi)
[
50.73(a)(2)(i)(B)
El 50.73(a)(2)(v)(D) or in Since the divider barrier seal was fully capable of performing its function with the identified conditions, the degradation of the divider barrier seal had no effect on the PRA results and was not risk significant from a PRA perspective.
Because the divider barrier seal was capable of performing its safety function with the identified deficiencies, the event does not constitute a significant degradation of safety barriers or an unanalyzed condition, and does not involve a safety system functional failure.
Corrective Actions
Completed Corrective Actions A mode constraint was established to ensure that the divider barrier seal deficiencies were corrected prior to the unit entering Mode 4. The damage to the seal material was repaired, and the loose nut was tightened.
The work was inspected and determined to be satisfactory. The mode constraint was lifted.
Planned Corrective Actions
No additional corrective actions are planned.
Previous Similar Events
A search of Licensee Event Reports (LER) for Donald C. Cook Nuclear Plant Units 1 and 2 for the past 3 years identified two LERs documenting conditions prohibited by Technical Specifications due to inoperability of the divider barrier seal:
LER 05000-316/2010-002-00 On October 15, 2010, during performance of the surveillance of the divider barrier seal, personnel identified two divider barrier seal retaining bolts missing, one retaining bolt with a loose nut and one retaining bolt missing its nut. Investigation of the condition concluded that the nut has been missing for the duration of the recently completed operating cycle, the bolts have been presumed missing since replacement of the divider barrier seal in 1990 and the loose nut was not properly tightened following removal of a seal sample coupon during a previous outage. Although the evaluation of the condition concluded the safety function of the divider barrier would still be met, the condition described above constitutes a non-compliance with the Technical Specification (TS) surveillance requirement and therefore is reportable as a condition prohibited by TS. The cause of the event was determined to be a lack of clear and detailed guidance in the containment divider barrier seal surveillance procedure. The failure to comply with TS 3.6.13 was reported in accordance with 10 CFR 50.73(a)(2)(i)(B), Operation or Condition Prohibited by Technical Specifications.
LER 05000-316/2010-003-00 On November 30, 2010, Operators determined that the containment divider barrier was inoperable. This occurred shortly after Unit 2 ascended from Mode 5 to Mode 4. A modification of the containment divider barrier seal had been completed prior to entering Mode 4, but the seal was not recognized as having been reassembled incorrectly at that time. As a result, the entry into Mode 4 was made with the Technical Specification (TS) required containment divider barrier inoperable. The cause was personnel exceeding written work scope by disassembling and not properly restoring a portion of the divider barrier seal adjacent to the area being modified. Ascension to Mode 4 with the containment divider barrier inoperable without meeting LCO 3.0.4 conditions was reported in accordance with 10 CFR 50.73(a)(2)(i)(B), Operation or Condition Prohibited by Technical Specifications.