TXX-3430, Outlines Programs Which Will Be Implemented to Ensure long-term Operability of Deep Draft Pumps Identified in IE Bulletin 79-15 in Response to NRC .Installation Procedures Encl

Outlines Programs Which Will Be Implemented to Ensure long-term Operability of Deep Draft Pumps Identified in IE Bulletin 79-15 in Response to NRC .Installation Procedures Encl

ML20032A526
Person / Time
Site:	Comanche Peak
Issue date:	10/26/1981
From:	Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Harold Denton Office of Nuclear Reactor Regulation
References
IEB-79-15, TXX-3430, NUDOCS 8110300296
Download: ML20032A526 (4)

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TEXAS UTILITIES GENERATING COMPANI Log-#1TXX-3430 20m nava.nowen.nausrexas m6i c pile #:10115 '

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-- R. J; GARY '

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. October 26,'19d1 A

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6 Dr. Harold R..Denton.

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-O -0073 Director of. Nuclear ReactorLRegulation ISSyg Tg U. S. : Nuclear Regulatory Comission u,.,kgma; 4 g

-OfficeLof Nuclear Reactor Regulation

Washington,-D.C.. 20555

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.COMAN' HE PEAK STEAM ELECTRIC STATION '

SUBJECT:

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. DOCKET N05. 50-445 AND,50-446 -

LONG TERM OPERABILITY.0F DEEP DRAFT PUMPS REF:

IE BULLETIN-79-15

Dear Dr. Denton:

In response to NRC letter dated August 24, 1981 concerning l'ong term operability of deep' draft pumps, we offer the following.

'As identifin in our response to IE Bulletin 79-15 CPSES has four deep draft pumps used in the Service Water Systems for: Units -1 and 2.

Initial installation of these systems has been in-complete:

accordance with the manufacturers guidelines per the attached installation procedure.

s During the operation phase the following programs.will be implemented to ensure long term reliability of the pumps:

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1)

Installation Procedures-will be' developed to ensure proper.

alignment and concentricityf of all mating surfaces during U

c subsequent reinstallations. _These procedures will be-

. commensurate with original-construction specifications and manufacturers guidelines.

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2) Radial vibration readings will be taken on the top.three 1[

pumps bearings at. regular intervals ~ to detect ~ changes in operating parameters.' Complete signature trace analysis-

.will be conducted as necessary in order to' trend overall equipment performance.

3) The subject: pump's will be included in the CPSES In-Service.

Inspection _ Program as-Class 3 pumps. ' Periodic inspection

'and operability testing will'be conducted according to-L

applicable codes to provide-trend analysis of equipment

-degradation.

AMw*W4W%

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- Log # TXX-3430'

'.Should' you have additional questions,; please advise.

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Sincerely.-

R. J. Gary

_ RJG:tls Att..;. ment l

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1.0 INSTALLATION' PROCEDURE 1.1 PUMP INSTALLATION a.

Straightness of shaft segments:

Measurements were not taken to verify manufacturing tolerances of shaft straightness. The pumps came assembled and disassembly could not be justified upon initial installation.

One pump was disassembled to inspect for damage to bearing support " spiders" and impellers because of inadvertent dropping of a construction tool into the pump discharge flange. The disassembly, inspection and reassembly was done under the direction of a manufacturer's representative (Hayward Tyler Pump Company). No damage nor abnormalities were found on the shaft of the pump which was disassembled.

b.

High precision couplings:

Per a telephone conversation between Mr. Jim Green (Project Engineer for Haywcrd Tyler) and our Mark Smith, the couplings are what they consider to be of a high precision quality.

Pump to motor couplings are manufactured to yield coupling alignment readings of less than.002 inch face-to-face and total runout. Shaft segment couplings are manufactured to a maximum tolerance of.002 inch concentricity and.001 inch perpendicularity.

c.

Pump segment flance perpendicularity to the segment centerline:

This manufacturing tolerance was not verified by field measurement.

Straightness of pump segments:

This manufacturing tolerance was not verified by field measurement.

Concentricity of the mating surfaces to an established datum:

This manufacturing tolerance was not verified by field measurement. However the rabbet joint between the pump segments assures concentricity from one pump segment to the next.

Concentricity between journal bearing guides (" spiders") and their mating surfaces:

Concentricity between " spiders" and their mating surfaces was not verified by field measurement.

However, the " spiders" were welded in place prior to machining of the bearing journal sleeves, thus assuring concentricity between the two.

Note that as mentioned above, a construction tool was inadvertently dropped into the pump discharge flange.

The tool hit one of the " spiders", but due to the-size of the

._..p

" spider". only superficial damage was encountered. A small-dent was blended into adjacent metal and liquid penetrant

. tested. No other detrimental effects were found.

d.

Optical alignment of full pump ~ casing:

- The pump sole plates were leveled to within.003 inch.

Plumbness of the. pump casing is currently being verified by.

measuring to the pump casing flange 2 from two plumb lines, set 90 degrees apart. Any ou+ of plumbness greater than 3/32

%ch will be corrected by shimming the sole plate' of the b..p.

e.

Pump-to-motor flange perpendicularity:

Pump-to-motor flange perpendicularity is not measured per se.

However, in the process of aligning the coupling, face-to-face and runout readings of less than.002 inch are-achieved, thus assuring concentricity and parallelism of shaft centerlines. Couplings are installed per the manufacturer's instructions.

f.

Mating surfact: bolting & torquing sequence:

Bolt installation and torquing is done in accordance with the manufacturer's instructions.

1.2 SUMP INSTALLATION a.

Sump / pump mating flange perpendicular to sump line:

As noted above, the pump sole plates are leveled to within

.003 inch. Plumbness of the pump is being verified, thus checking perpendicularity of the flange to pump centerline, b.

Sump design:

The sump in an open intake structure. The pumps take suction from an open bay, fed by a channel from the lake, and a sparger from the circulating water system. There is no piping that could cause vortexing or turbulence near the pump bellmouth. Neither does the structure design encourage these anomalies.

c.

Inttiferences between the sump and pump appendages:

No interferences exists between the sump and any pump appendage.

GENERAL All initial installation work done and the disassembly, inspection, repair, and reassembly of one pump was all done under the direction of a vendor's representative and in accordance with the vendor's instruction manual.

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