ML20039D934
| ML20039D934 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 12/18/1981 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8201060356 | |
| Download: ML20039D934 (3) | |
Text
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6 DEC 1 g199; 7g (412) 456-6000 435 Santh Avenue Pittsburgh. Pa.
15219 United States Nuclear' Regulatory Commission 2OLC gg Region I 631 Park Avenue
-King of Prussia, PA 19406 ATTENTION:
Mr. R. Haynes, Administrator 6)
SUBJECT:
BEAVER VALLEY POWER STATION - UNIT NO. 2 g/
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Docket No. 50-412 j
Auxiliary Feedwater Pump J4tl S Ru s.
i Impeller Wear Rings - Significant 2Q U(
Deficiency Report 81-04
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Gentlemen:
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This Letter is Interim Report Number 1 concerning signifNant Deficiency 81-04.
On November 20, 1981, a potentially significant deficiency concerning cracked impeller wear rings on the Turbine Driven Auxiliary Feed Pump (2FWE-P22) and possible cracked impeller wear rings on the Motor Driven Auxiliary Feed Pumps (2FWE-P23A,B), was reported to your Mr.
Bateman.
This has been determined to be reportable in that it is a significant deviation from performance specifications which has the po_tential to reduce the core residual heat removal capability.
The detailed evaluation of the wear rings involved is in
. progress. A more thorough statement concerning this matter is attached.
A final report will be submitted by February 26, 1982.
DUQUESNE LIGHT COMPANY By V E. J'. Moolever Vice President Attachment cc:
Mr. D. Young (15)
Director of Inspection and Enforcement Ms. J. Grant Project Manager Mr. G. Walton NRC Resident Inspector
-9 201060356 911218 g6 2.7 PDR ADOCK 05000412 ss PDR-j
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INTERIM REFORT OF AUXILIARY FEED, PUMP IMPELLER' RING CRACKING AT
' BEAVER' VALLEY POWER STATION - UNIT NO. 2 1.0-
SUMMARY
During a. post test inspection of the Turbine Driven Auxiliary Feed Pump. (2FWE-P22) (TDAFP) being performed at the Terry Turbine Cor-poration, on September 10, 1981, several cracked impeller: wear rings were discovered. Should this condition also exist on the Motor Driven Auxiliary Feed Pumps (2FWE-P23A&B) (MDAFP) there is a potential for complete wear - ring failure ~and loss of pump performance.
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IMMEDIATE ACTION TAKEN Upon discovery of the cracked impeller wear rings on the TDAFP, the-entire pump / turbine assembly.was returned to the Bingham Wi_llamette-Company (BWC) in Portland, Oregon,- for a complete engineering assessment.
The BWC engineering assessment ~ attributed the impeller wear. ring cracking to the use of previously used rings when the impeller was replaced prior to the_ delivery of the pump. The additional stresses imposed on ;the rings by removal and re-installation are the probable -
.cause of the_ cracking.
'Because the MDAFP impellers were also replaced, it is possible.,that similar problems exist ~ in these' pumps. They have been-inspected in the field and returned to'the BWC for assessment.
3.0 DESCRIPTION
OF DCFICIENCY Cracked impeller wear rings at the securing pin ' hole. juncture on various impeller stages of the TDAFP have been evaluated by the BWC.
Because of the similarity in constr20 tion of the TDAFP and the MDAFP's, it.has been. determined that - there is a potential for-impeller wear' ring failure and loss of pump performance on these pumps also.
4.0 ' ANALYSIS OF SAFETY IMPLICATION
- A r' eduction ~ in auxiliary ' feed pump performance could result in reduction of ' residual heat removal capability.
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7 5.0 CORRECTIVE ACTION TO REMEDY DEFICIENCY The final corrective action has not been determined pending technical evaluation of the MDAFP wear rings by Bingham Willamette.
6.0 FINAL REPORT.
A final report will be submitted by February 26, 1982 af ter completion of rework and analysis.
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