05000483/LER-2002-001, Re Manual Auxiliary Feedwater Actuation and Subsequent Gas Binding of the a Motor Driven Auxiliary Feedwater Pump
| ML020510494 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 02/01/2002 |
| From: | Witt W AmerenUE |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| ULNRC-4605 LER 02-001-00 | |
| Download: ML020510494 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iii) 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)(v), Loss of Safety Function |
| 4832002001R00 - NRC Website | |
text
Union Electric Callaway Plant P0 Box 620 Fulton, MO 65251 February 1, 2002 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-4605 WA meren UE Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.
FACILITY OPERATING LICENSE NPF-30 LICENSEE EVENT REPORT 2002-001-00 Manual Auxiliary Feedwater Actuation and subsequent gas binding of the "A" Motor Driven Auxiliary Feedwater pump The enclosed licensee event report is submitted in accordance with 10CFR50.73(a)(2)(iv)(A) to report an event that resulted in the manual actuation of the Motor Driven Auxiliary Feedwater pumps and the subsequent gas binding of the "A" Motor Driven Auxiliary Feedwater pump.
Warren A. Witt Manager, Callaway Plant WAW/ewh Enclosure 1Wl a subsidiary of Ameren Corporation
ULNRC-4605 February 1, 2002 Page 2 cc: Mr. Ellis W. Merschoff Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)
Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 7E 1 Washington, DC 20555-2738 Manager, Electric Department Missouri Public Service Commission PO Box 360 Jefferson City, MO 65102 Mr. John O'Neill Shaw, Pittman, Potts & Trowbridge 2300 N. Street N.W.
Washington, DC 20037 Mr. Scott Bauer Regulatory Affairs Palo Verde Nuclear Generating Station P.O. Box 52034, Mail Station 7636 Phoenix, AZ 85072-2034 Mr. Scott Head Supervisor, Licensing South Texas Project NOC Mail Code N5014 P.O. Box 289 Wadsworth, TX 77483 Records Center Institute of Nuclear Power Operations 700 Galleria Parkway Atlanta, GA 30339 Mr. Dennis Buschbaum Comanche Peak SES P.O. Box 1002 Glen Rose, TX 76043 Mr. Pat Nugent Supervisor, Licensing Pacific Gas & Electric Mail Stop 104/5/536 P.O. Box 56 Avila Beach, CA 93424
NRC FORM 366 U.S. NUCLEAR REGULATORY APPROVED BY OMB NO. 3150-0104 EXPIRES 6-30-2001 (1-2001)
COMMISSION the NRC may not conduct or sponsor.
and a person is not required to respond to, the information collection.
FACILITY NAME (1)
DOCKET NUMBER (2)
PAGE (3)
Callaway Plant Unit 1 05000483 1 OF 4
TITLE (4)
Manual Auxiliary FeedwaterActuationandsubsequentgasbindin of he"A"MotorDrivenAuxiliaryFeedwaterpump EVENT DATE (S)
LER NUMBER (6)
REPORT DATE (7)
OTHER FACILITIES INVOLVED (8) f FACILITY NAME [DOCKET NUMBER MO DAY YEAR YEAR NUMBER NO MO DAY YEAR 05000 FACILITY NAME l DOCKET NUMBER 12 3
2001 2002 - 001 00 2
1 2002 l
05000 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR
- (Check all that apply) (11 )
MODE (9) 20.2201 (b) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(B)
_ 50.73(a)(2)(ix)(A)
POWER 20.2201 (d) 20.2203(a)(4) 50.73(a)(2)(iii) 50.73(a)(2)(x)
LEVEL (10) 20.2203(a)(1) 50.36(c)(1)(i)(A)
X 50.73(a)(2)(iv)(A) 73.71 (a)(4) 20.2203(a)(2)(i) 50.36(c)(1 )(ii)(A) 50.73(a)(2)(v)(A) 73.71 (a)(5) 20.2203(a)(2)(ii)
__50.36(c)(2)
__50.73(a)(2)(v)(B)OTE
.X_____
Secify in Abstract below or in 20.2203(a)(2)(iii) 50.46(a)(3)(ii) 50.73(a)(2)(v)(C)
(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) has been completed, this value will be included in a Supplement to this LER.
HI.
CAUSE OF THE EVENT
The initiating precursor was a main turbine high vibration condition. Analysis of available plant data indicated that an excessive cooldown rate of the main turbine occurred. This in turn negatively affected component tolerances with a resulting high vibration condition. Plant shutdown procedures did not provide adequate warnings or precautions against this cooldown rate.
The failure of the "A" MDAFW pump was due to gas binding of the pump caused by foreign material momentarily blocking the pump suction. This foreign material was determined to be from a foam ring attached to a floating cover contained within the CST. The foam ring had deteriorated causing a piece of the foam to tear loose and be drawn into the suction piping of the "A" MDAFW pump.
IV.
CORRECTIVE ACTIONS
To prevent similar turbine vibration issues in the future, several procedures have been revised. Additional operator training is being conducted on these procedure changes.
Concerning the gas binding problem, the foam ring was repaired. Future internal inspections of the CST are being planned. Visual inspections of the suction supply piping from the CST to the AFW pumps are being conducted to verify no additional foreign material. Removal of the floating cover is being evaluated.
V.
PREVIOUS SIMILAR EVENTS
A review of the Callaway Action Request System (CARS) and Callaway LERs is continuing.
VI.
ADDITIONAL INFORMATION
The system and component codes listed below are from the IEEE Standard 805-1984 and IEEE Standard 803 A-1984 respectively.
System:
BA Component: P