05000317/LER-2005-003-01, Regarding Overpower Condition Resulting from Non-conservative Flow Correction Factors
| ML053540215 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/14/2005 |
| From: | Joseph E Pollock Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| -RFPFR LER 05-003-01 | |
| Download: ML053540215 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2) 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 |
| 3172005003R01 - NRC Website | |
text
i Calvert Cliffs Nuclear Power Plant Constellation Generation Group, LLC 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 I
0Constellation Energy December 14, 2005 U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit Nos. I & 2; Docket Nos. 50-317 & 50-318; License Nos. DPR 53 & DPR 69 Licensee Event Report 2005-003-01 Overpower Condition Resulting from Non-conservative Flow Correction Factors The attached licensee event report supplement is being sent to you as required by 10 CFR 50.73. Should you have questions regarding this report, we will be pleased to discuss them with you.
Very truly yours, Joseph E. Pollock Plant General Manager JEP/MJY/bjd
Attachment:
As stated cc:
P. D. Milano, NRC S. J. Collins, NRC Resident Inspector, NRC R. I. McLean, DNR
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 (62004)
Estimated burden per response to comply with this mandatory collection request: 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-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 FOWPrlvacy Service Branch T-5 F52), U.S.
LICENSEE EVENT REPORT (LER)
Nuclear Regulatory Commission, Washington, DC 20555-0001 orby Internet e-mail to Infocollects@nrc.gov, and to the Desk Officer, Office of Information andReglatry ffarsNEO1 002,(350-0104), Office of Management and (SenBdgReltWashntoryfaXn. C 20o503. Iof a(meaons~uosed to impose an informnation (See reverse for required number of collecton does notdisplayacurrentiyvalid 0MBconto number, the NRCmay digits/characters for each bIock Inot conduct seconsor and a person is not required to respond to, the
- 3. PAGE Calvert Cliffs Nuclear Power Plant 05000 317 1 OF 004
- 4. TITLE Overpower Condition Resulting from Non-conservative Flow Correction Factors
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REOV MONTH DAY YEAR Calvert Cliffs 05000 318 FACiLITY NAME DOCKET NUMBER 09 12 2005 2005 - 003 -
01 12 14 2005 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply) 0 20.2201(b) 0 20.2203(a)(3)(i)
[I 50.73(a)(2)(i)(C)
E 50.73(a)(2)(v0i) 1 0 20.2201(d) 0 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
El 20.2203(a)(4)
El 50.73(a)(2)(ii)(B)
[I 50.73(a)(2)(viii)(B)
El 20.2203(a)(2)(i) a 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)(ii)(A) 0 50.73(a)(2)(iv)(A)
E 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
El 50.73(a)(2)(v)(A)
El 73.71 (a)(4)
El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii) 0 50.73(a)(2)(v)(B)
D 73.71 (a)(5) 100 la 20.2203(a)(2)(v) 3 50.73(a)(2)(i)(A)
- 3 50.73(a)(2)(v)(C)
I3 OTHER El 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B)
El 50.73(a)(2)(v)(D)
Specify In Abstract below I
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)
IV.
CORRECTIVE ACTIONS
A.
All main feedwater flow correction factor inputs to the plant computer were restored to a value of 1.000 to effectively remove the UFMs from service.
B.
The vendor has initiated measures to further evaluate and revise, as necessary, design basis documentation to further clarify flow stability requirements based on lessons learned at CCNPP.
C.
Calvert Cliffs Nuclear Power Plant will verify the UFM's are installed in an area of suitable flow and in-situ calibration correction factors are accurate prior to returning the UFM's to service.
D.
The vendor has initiated measures to ensure that oversight of future installations of their UFM system is sufficient to prevent recurrence of the conditions identified in this report.
V.
ADDITIONAL INFORMATION
A.
Component Identification Component Feedwater Flow Venturi Plant Computer IEEE 803 EIIS Function Fl CPU IEEE 805 System ID SJ ID B.
Previous Occurrences
No other previous similar events have occurred within the past three years at CCNPP.