ML20098D994

Supplemental Deficiency & Part 21 Rept U-70 Re Failures of Crane-Deming Model 1549 Positive Displacement Gear Pumps Used as Keepwarm Lube Oil Pumps on Emergency Diesel Generators.Design Change to Keepwarm Pumps Initiated

ML20098D994
Person / Time
Site:	Callaway
Issue date:	09/12/1984
From:	Schnell D UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-84-463-000 PT21-84-463, PT21-84-463-000, U-70, ULNRC-925, NUDOCS 8409280085
Download: ML20098D994 (2)

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1 9- UNION ELECTRIC COM PANY -

1908 GRATIOT STREET ST. Louis, Missount '

oo o r .c au. -- ~ September 12, 1984 g ,o ,=;=ggy, ,,,,,

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.- Mr'. James G. Keppler-

_ Regional: Administrator iU.S. Nuclear Regulatory Commission 799 Roosevelt Road-Glen Ellyn,_IL~-60137' ULNRC- 925

Dear Mr. Keppler:

SUPPLEMENTLTO 10CFR50.55(e)/PART 21 REPORT U-70 i EMERGENCY' DIESEL' GENERATOR-KEEPWARM LUBE OIL PUMP CALLAWAY PLANT'

Ref: 1) ULNRC-780, 3/28/84 2)~ULNRC-831, 5/26/84 The referenced letters reported failures of Crane-Duing Model'1549 positive displacement gear pumps used as keepwarm lube oil pumps on the Callaway Plant emergency; diesel generators.

Additional failures of the Crane-Deming keepwarm pump 3 have occurred subsequent to the referenc'ed reports as follows:

o The "A" engine pump idler gear bushing failed during operation on August 4. A' spare Crane-Deming pump was installed.

o The "B" engine pump seized during operation on

-August 9. Inspection revealed.7 broken teeth on the drive gear and scoring of the idler gear bushing. The pump was replaced with the Viking pump originally furnished with the engine as discussed below, o The "A" engine pump installed after the August 4 y failure failed during operation on August 16.

Inspection revealed' broken teeth on the drive gear. The pump was replaced with the Viking pump originally. furnished with the engine as dis-cussed below.

The cause of these recent failures, which are of the same nature as the previously reported' failures, has not been conclusively ,

determined. Since Crane-Deming has discontinued their "N" stamped j i

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Ar. Jam i G. Keppler l Page Two l gear pump product line and replacements are not available, no further expenditure of resources will be made regarding continued use of these pumps.

To eliminate suspected causes of failure, other than a possible inherent problem with the Crane-Deming pump, a design change has been initiated to relocate the keepwarm pumps to provide imp; roved accessibility for performing pump to motor alignment and to provide flexible pipe connections to eliminate any possibility of pipe strain on the pump. The replacement pumps will be Viking Model AL193, specified and procured with appropriate controls to assure equivalency to ASME Section III, Class 3, Seismic Category I, Quality Group C requirements.

In the interim, until the design change can be implemented, the manufacturers standard Viking pump.' originally furnished with the engines (because of unavailability or "N" stamped pumps at the tina of shipment) are being utilized under the temporary modifica-tion program. . Critical evaluation of operation with these pumps by our A/E (Bechtel) and Union Electric indicates that the safe shutdown capability of the plant is not adversely affected and that an unreviewed safety question does not exist.

We expect that the design change documents and the ASME Section III equivalent replacement Viking pumps will be available by January 1985. However, since we consider replacement of the presently installed pumps to be an enhancement, it is our intent to defer-installation unt'l the first plant outage of sufficient duration, but no later than the first refueling.

Very truly yours, Donald F. Schnell RPW/jds l