TXX-6452, Forwards Wg Counsil to Nh Williams Re A-563 Grade a Nuts & S&W 870325 Memo 141 Re Unequal Shear Loading Effect on Richmond Inserts & Threaded Rods Used in Conjunction W/ Tube Steel

Forwards Wg Counsil to Nh Williams Re A-563 Grade a Nuts & S&W 870325 Memo 141 Re Unequal Shear Loading Effect on Richmond Inserts & Threaded Rods Used in Conjunction W/ Tube Steel

ML20214E104
Person / Time
Site:	Comanche Peak
Issue date:	05/14/1987
From:	Counsil W, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
TXX-6452, NUDOCS 8705210649
Download: ML20214E104 (3)

Text

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.-e M Log # TXX-6452 FE File # 10068 10010 clo r =

1UELECTRIC

""'""'ff""L,, May 14, 1987 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 COMANCHE PEAK CORRECTIVE ACTION PROGRAM RESOLUTION OF CONCERNS Gentlemen:

Enclosed are 15 copies of the following:

1. Letter from W. G. Counsil to N. H. Williams dated April 21, 1987 concerning A-563 Grade A Nuts.

2. Stone & Webster Engineering Corporation's Project Memorandum No. 141 dated March 25, 1987, to all Comanche Peak Froject Procedure Manual Holders concerning Unequal Shear Ioading Effect on Richmond Inserts and Threaded Rods Used in Conjunction with Tube Steel.

Item 1 above provides information regarding the use of A-563 Grade A Nuts for I resolution of a CYGNA issue. Item 2 provides.the criteria by which a review of Richmond Inserts to Tube Connection Designs confirms that Unequal Shear Load Sharing is not a concern.

The Atomic Safety and Licensing Board will be notified of this transmittal per separate letter from our attorneys.

Very truly yours,

0. 0 W. G. C unsil 8705210649 870514 C PDR ADOCK 0500 5

~

gy h D. R. Woodlan Supervisor, Docket Licensing JDS/mlh Enclosures c - Mr. R. D. Martin, Region IV I O Mr. D. L. Kelley, RI - Region IV 0 Mr. H. S. Phillips, RI - Region IV t 400 North Othe Street Lit. Mi Dallas. Texas 75201

' Enclosure 1.to TXX-6452

.May.-14, 1987 Page 1 of 1

= Log # TXX-6409 P7 File # 02260 1UELECTRIC April 21,1987 CYGNA Energy Services ATTN: Ms. N. H. Williams, Project Manager Comanche Peak Project 101 California Street, Suite 1000 San Francisco, CA 94111

SUBJECT:

RESOLUTION OF CYGNA A-563 GRADE A NUTS ISSUE

Dear Ms. Williams:

)

In the public. meeting between TV Electric and CYGNA held in Glen Rose, Texas on March 25, 1987, TU Electric committed to inspect for A-563 Grade A galvanized nuts in'our Hardware Validation Program (HVP) to assure that these nuts are not used on safety related pipe supports. On the basis of this commitment, CYGNA closed their pipe support issue No. 28.

Subsequent to that meeting, SWEC . conducted a review of purchase orders issued for pipe support specifications (2323-MS-46A and 46B) and found that galvanized A-563 Grade A or A-307 nuts had not been purchased for pipe supports. Therefore we have concluded that A-563 Grade A or A-307 galvanized nuts were not called for i

in the design of pipe supports and would not have been installed. In addition, all pipe support material is stored in a separate warehouse which eliminates the possibility that galvanized nuts may have been inadvertently issued for pipe support applications. To assure that A-563 or A-307 galvanized nuts are not used for future design modifications, SWEC has issued PM 146 to preclude their use.

We consider our actions to have addressed CYGNA's concern on the use of A-563 Grade A galvanized nuts. Therefore, inspection for these nuts in our HVP is no longer required.

Very truly yours, ,

/

$$ d2 /.

W. G. Counsil BSO/amb-400 N. Olne Dallas. Texas 75201

P Enclosura 2 to TXX-6452 flay 14, 1987-Pag 21 of 1 STONE & WEBSTER ENGINEERING CORPORATION - CHERRY HILL OPERATIONS CENTER PM-141 INTEROFFICE MEMORANDUM yCSj o 15454/15616

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FROJECT MEMORANDUM NO. 141 SUBJECT DATE March 25, 1987 CPSES - UNITS 1 AND 2 UNEQUAL SHEAR LOADING EFFECT ON RICHMOND INSERTS AND THREADED RODS FROM RPKlause USED IN CONJUNCTION WITH TUBE STEEL 0978-1545405-C4WPC All CPPP Manual Holders Job Book M3.1 Job Book M3.2.7 The purpose of this memorandum is to provide additional criteria for the evaluation of Richmond inserts and threaded rods used in conjunction with tube steel. These conservative criteria address any potential unequal shear loading on the inserts and threaded rods.

Effective immediately, the following additional criteria shall be adopted for Richmond insert connections used in conjunction with tube steel.

These criteria are not applicable for baseplate designs used in conjunc-tion with Richmond inserts and threaded rods or other anchorage, such as Hilti bolts.

1. Review the ratios of actual shear force to the allowable shear force, V/V,, for the insert and the threaded rod.

2. If both V/V ratios are less than or equal to 0.25, no further action is ne,cessary.

3. If a V/V ratio is greater than 0.25, double the shear ratio and perform lhe interaction equation check in accordance with Sec-tion 3.2 of Attachment 4-5 of CPPP-7, Revision 3, using this new shear ratio.

4. Project Service Group (PSG) shall be notified of any support for which V/V, > 0.25.

5. PSG shall maintain a log of these supports.

All other requirements of Attachment 4-5 remain in effect. .

This memorandum will be incorporated into the next revision of CPPP-7.

/ EL R. P. Klause Project Manager i

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