ML20080N970

Part 21 Deficiency Rept Re Defective ITT-Grinnell Hydraulic Snubbers.Initially Reported in 830928 Telcon.Deficient Snubber Valve Blocks Will Be Remachined & Snubbers Rebuilt

ML20080N970
Person / Time
Site:	Palisades
Issue date:	09/30/1983
From:	Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-83-023-000 PT21-83-023-000, PT21-83-23, NUDOCS 8310060221
Download: ML20080N970 (4)

Text

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h Consumers .

Power Company General offices: 1946 West Parnell Road, Jackson, MI 49201 . (517) 788-0550 September 30, 1983 James G Keppler, Administrator Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - 10 CFR 21 REPORT - DEFECTIVE ITT-GRINNELL HYDRAULIC SNUBBERS The attached 10 CFR 21 Report provides information on the apparent manufactur-ing deficiency discovered in the ITT-Grinnell Hydraulic Snubbers used to provide seismic restraint to the Palisades Plant steam generators. As a result of an evaluation of the deviation, it was determined that this occur-rence is reportable in accordance with 10 CFR 21, " Reporting of Defects and Noncompliances."

Sixteen (16) ITT-Grinnell Snubbers are in service at the Palisades Nuclear Plant. The deficient valve blocks of the snubbers will be remachined, the snubbers will be rebuilt and functionally tested.

This correspondence confirms a telecon report made to Mr Duane Boyd of your Staff on September 28, 1983 and thus conforms with the notification criteria of 10 CFR 21.21(b)(2),

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Brian D Johnson Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades Attachment GCT OC0983-0020A-NLO2 8310060221 830930 d/g 6 \c}

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I 10 CFR 21 REPORT The following information is provided below as required by 10 CFR 20:

1) Name and address of individual informing the Commission:

Brian D Johnson Consumers Power Company 1945 W Parnall Rd Jackson, MI 49201

2) Facility identification, activity or basic component which fails to comply or contains defects is:

Hydraulic Snubbers; S/N 1957, 1962, (8" bore x 5" stroke)

3) The firm constructing facility or supplying the basic component which failed to comply or contained defect is:

ITT-Grinnell 260 W Exchange St Providence, R1 02901

4) a. Natura cf defect or failure to comply is:

Dimensioned stack-up of the valve block revealed that the end spring became " solid" before the necessary snuttle valve travel occurred. This resulted in the failure of the shuttle to close the appropriate ports needed to cause lock-up of the snubber. See attached figure.

b. The safety hazard which was or could be created is:

Reduced seismic restraint of steam Eenerators

5) The date when information of defect or failure to comply was obtained is:

September 27, 1983.

6) In the case of a basic component which contains a defect or fails to comply, the number and location of all such components in use at, supplied for or being supplied for one or more facilities or activities subject to Part 21 is:

16 ITT-Grinnell snubbers of this type are used at the Palisades Nuclear Plant for seismic restraint of both steam generators (8 snub-bers per steam generator). Snubber location numbers are 46 through 61, inclusive.

OC0983-0020B-NLO2

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.- 2 7).a. The corrective action planned or taken is:

1. Determine the appropriate as-found dimensions of the valve blocks for the remaining 14 snubbers.

2. Machine deficient valve blocks as necessary.

3. Rebuild snubbers.

4. Perform functional test of snubbers.

b. The name of the individual / organization responsible is:

Palisades Nuclear Plant

8) Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being or will be given to purchasers or licensees:

None Prepared By M // N ee d Date [If[# f Approved Yes No B d Mr d i

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i A. Spring position with respect to valve block surface when spring is solid = .865.

8. Dl stance from valve block surface to edge of port = 2.00.

1 C. Distance from spring contact surface or shuttle to sealing land = 1.187 1

A+C$B to create seal

.BBS+1.187[2.0 2.072[2.0

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