ML20092C181

Interim Deficiency Rept 84-02 Re Containment Spray Impellers Incorrectly Installed in Unit 1 Pumps.Initially Reported on 840504.Requirements Established to Preclude Exchange of Noninterchangeable Part.Final Rept by 840731

ML20092C181
Person / Time
Site:	Byron
Issue date:	06/14/1984
From:	Tramm T COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
84-02, 84-2, 8762N, NUDOCS 8406210042
Download: ML20092C181 (2)

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t C 7 Address Reply to: Post Offica Box 767

\ / Ciucago, minois 60690 June 14, 1984 Mr. James G. Keppler Regional Administrator U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Byron Generating Station Units 1 and 2 Containment Spray Pump Impe11ers NRC Docket Nos. 50-454 and 50-455

Dear Mr. Keppler:

This is to provide an interim report on a deficiency in the Byron 1 containment spray pump impe11ers. This deficiency was reported pursuant to 10 CFR 50.55(e) on May 4, 1984. A final report will be provided by July 31, 1984. For NRC tracking purposes this deficiecy is numbered 84-02.

Description Of Deficiency Containment spray system pump impellers were incorrectly placed in Unit 1 pumps (ICS0lPA and ICS0lPB) during construction when Unit 2 pump parts were transfered as replacements for the original furnished Cquipment. The Unit 2 "A" pump impeller (low flow) was placed in the Unit 1 "B" pump and the "B" pump impeller (high flow) in the "A" pump.

The above condition was identified during the engineering analysis of pump data which questioned the disparity between the test and vendor pump curves.

Analysis Of The Safety Implications Utilizing data gathered during preoperational testing of the Unit 1 containment spray pumps, pump curves plotted for the "A" pump (with "B" impeller installed) met pump curve acceptance criteria whereas the "B" pump (with "A" impeller installed) did not meet its designed flow rate curve.

Subsequent engineering analysis of the containment spray system test data determined that at the pump operating point, the pumps carginally met the required total developed head flow requirements.

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1 J. G. Keppler June 14, 1984 Corrective Action Taken and Results Achieved l The pump impellers were removed and measured to verify size. i The serial numbers were also correlated with vendor documentation. After proper identification of pump impellers was established the "A" pump i impeller was installed in the "A" pump and the "B" pump impeller in the

1. B" pump. A preoperational retest has been performed to gather data necessary to verify pump performance satisfactorily meets acceptance ,

criteria. Commonwealth Edison Project Engineering Department will review safety related pump data and establish requirements to preclude exchange of component parts that are not interchangeable.

l Please address any questions regarding this matter to this office.

Very truly yours, f/ k, f4W=

T. R. Tramm Nuclear Licensing Administrator im I

cc: Director of Inspection & Enforcement l

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8762N l

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