05000440/LER-2003-004, Regarding Emergency Service Water Pump Upper Shaft Coupling Sleeve Failure
| ML033210155 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 11/04/2003 |
| From: | Kanda W FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| PY-CEI/NRR-2743L LER 03-004-00 | |
| Download: ML033210155 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4402003004R00 - NRC Website | |
text
FENOC FirstEnergy Nuclear Operating Company Perry Nuclear Power Plant 10 Center Road Perry Ohio 44081 Mlliarn R. Kanda 440-280-5579 Vce President - Nuclear Fax: 440-280-8029 November 4, 2003 PY-CEI/NRR-2743L United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Perry Nuclear Power Plant Docket Number 50-440 LER 2003-004-00 Ladies and Gentlemen:
Enclosed is Licensee Event Report (LER) 2003-004, Emergency Service Water Pump Upper Shaft Coupling Sleeve Failure. This event report is submitted in accordance with IOCFR50.73(a)(2)(i)(B), as an operation or condition prohibited by Technical Specifications.
There are no regulatory commitments contained in this submittal. Any actions discussed in this document that represent intended or planned actions, are described for the NRC's information, and are not regulatory commitments.
If you have questions or require additional information, please contact Mr. Vernon Higaki, Manager-Regulatory Affairs, at (440) 280-5294.
Very truly yours, e"__
Enclosure
/
cc:
NRC Region III Administrator NRC Senior Resident Inspector - PNPP NRR Project Manager - PNPP
1
Abstract
On September 1, 2003, at 1717 hours0.0199 days <br />0.477 hours <br />0.00284 weeks <br />6.533185e-4 months <br /> with the plant operating in Mode 1 at 100 percent power, emergency service water (ESW) pump A was declared inoperable due to indications that the pump Kadi failed.
was later detrmtin&dfthat -
pshaft-boupling had-failed and that it would take-longer than the Technical Specification (TS) Limiting Condition for Operation (LCO) completion time to complete repairs. A Notice of Enforcement Discretion (NOED) was requested of the NRC in order to obtain replacement parts, complete repairs and perform testing of the pump. The NOED for a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> duration was verbally approved on September 4, 2003. At 0517 hours0.00598 days <br />0.144 hours <br />8.54828e-4 weeks <br />1.967185e-4 months <br /> on September 5, 2003 the LCO for TS 3.7.1 and 3.8.1 expired and the plant entered the NOED. After completion of repairs, ESW A pump was declared operable at 1855 hours0.0215 days <br />0.515 hours <br />0.00307 weeks <br />7.058275e-4 months <br /> on September 5, 2003. The root cause of the coupling sleeve failure is stress corrosion cracking. This event is considered to have a low to moderate safety significance. Since the Actions of the TSs were not satisfied when the NOED was entered, this is a reportable event in accordance with IOCFR50.73(a)(2)(i)(B), any operation or condition that was prohibited by the plant's TSs.
NRC FORM 366 (7-2001)
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V) scheduled date for the pump rebuild would be Refuel Outage (RFO) 11, approximately 4 years from RFO9.
Procedure GMI-039, "Disassembly of Emergency Service Water Pumps," has been revised (revision 6) to provide more explicit instructions on pump disassembly and re-assembly, paying particular attention to shaft coupling sleeve installation on the ESW pumps A & B.
Procedure GMI-040, "Disassembly of Div 3 Emergency Service Water Pump," is being revised to provide more explicit instructions on pump disassembly and reassembly, paying particular attention to the shaft coupling for both threaded and sleeve style installation on the ESW pump C.
Procedure GMI-041, "Disassembly of Emergency Service Water Screen Wash Pump," is being revised to provide more explicit instructions on pump disassembly and reassembly, paying particular attention to shaft coupling sleeve installation, on the ESW Screen Wash Pumps A & B.
The ESW C pump coupling sleeves (8) in the warehouse have been quarantined/placed on hold until proper material properties are verified. Review of the CMTR's showed these coupling sleeves have a hardness of Rockwell C30.
An industry search on emergency core cooling system (ECCS) pump failures is planned to look at the frequency of complete pump tear-downs, determine the parameters used to evaluate if pump rebuilds are required and to determine the periodicity for replacing shafts, couplings and bearings.
After the next disassembly and rebuild of the ESW C pump, the documented condition of the removed pump couplings and an analysis of the couplings at the FirstEnergy Corporation Beta Laboratory should provide input as to when the next ESW C pump rebuild should be scheduled.
The condition of the ESW C pump should also provide input to an evaluation of when the ESW traveling screen pump A and B should be scheduled for future rebuilds.
VI) PREVIOUS SIMILAR EVENTS A review of LERs over the past 6 years did not identify any reportable condition that resulted from the failure of a pump coupling.
A word search was performed to identify Condition Reports at the PNPP relating to pumps or coupling sleeves. This review did not identify any Martensitic or type 416 stainless steel couplings that failed due to stress corrosion cracking in raw water service. No evidence of a previous ESW pump coupling sleeve failure was found.
VII) COMMITMENTS No regulatory commitments were identified in this report.
Energy Industry Identification System Codes are identified in the text by square brackets [XX].