TXX-6544, Final Deficiency Rept CP-86-60 Re Polar Crane Girder & Support Shim Gaps.Initially Reported on 860904.Unit 1 Brackets Evaluated as Adequate Support.Design Change Issued for Unit 2.Issue Not Reportable Under 10CFR50.55(e)

Final Deficiency Rept CP-86-60 Re Polar Crane Girder & Support Shim Gaps.Initially Reported on 860904.Unit 1 Brackets Evaluated as Adequate Support.Design Change Issued for Unit 2.Issue Not Reportable Under 10CFR50.55(e)

ML20234B300
Person / Time
Site:	Comanche Peak
Issue date:	06/29/1987
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-86-60, TXX-6544, NUDOCS 8707020327
Download: ML20234B300 (2)

Text

\

M Log # TXX-6544 FM File # 10110

. __. = . 903.8

= = Ref # 10CFR50.55(e)

RIELECTRIC WWiam G. Counsil Executive Vice President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 POLAR CRANE GIRDER AND GIRDER SUPPORT SHIM GAPS SDAR: CP-86-60 (FINAL REPORT) i

. Gentl emen:

On September 4,1986 we verbally notified your Mr. I. Barnes of a deficiency involving gaps between the polar crane girder and girder support brackets.

This is a final report of a potentially reportable item under the provisions of 10CFR50.55(e). Our last interim report logged was TXX-6434a,. dated June 17, 1987.

As a result of an observation that gaps between the polar crane g1rder and i girder support brackets for Unit I appeared excessive, an investigation was initiated-to assure the design adequacy of girder supports. This evaluation indicated the allowable gap tolerance in the girder seat connection was not addressed in project specifications. Guidance originally documented by Gibbs

& Hill-letter GHF-2207, dated November 28, 1977, indicated that the seated connection will not require shimming since the load bearing area is at least the width of the bottom flange of the crane girder. Nine girders'were observed with gaps extending under the bottom flange which reduced the load bearing surface to less than the 20 inch flange. width.

To assess this issue, engineering performed field verifications of all Unit I runway girder seismic support brackets (28 brackets with 56 runway girder beam ends). Field measurements of gap heights and gap depth were acquired. This resulted in the identification of four worst case beam end seat installations.

A map of the actual load bearing area (including amount and location) was ,

prepared from the field measurements and compared to the calculated load i bearing area requirements. All four of the worst case installations were within the calculated requirements and do not exceed code allowables.

We have concluded that the polar crane girders for Unit I are adequately supported without additional shimming. Field verification results and the adequacy of the load bearing surface are documented by analysis and calculations.

WSBBR S

68SNP ,

400 North Olive Street LB Si Dallas, Texas 720)

1 i

TXX-6544 June 29, 1987 Page 2 of 2 The design review performed for Unit I need not be applied to Unit 2. A design change had been issued for Unit 2 which required shimming, thereby eliminating any excessive gaps between the girders and the girder support brackets.

This issue is not reportable under the provisions of 10CFR50.55(e). Records supporting our position are available for your inspectors to review at the CPSES site.

Very truly yours, W. G. Counsil By: ,

G. S. Keeley Manager, Nuclear icensing RWH/gj c - R. D. Martin, Region IV Resident Inspectors, CPSES (3)

I