ML20205N586

Forwards Corrected Page 1 to JW Cook to H Berkow Re Pipe Whip Restraint Design.Last Line Inadvertently Eliminated When Ltr Originally Issued

ML20205N586
Person / Time
Site:	Midland
Issue date:	04/29/1986
From:	Richards L CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Berkow H, James Keppler, Michaels T NRC
References
32648, NUDOCS 8605020200
Download: ML20205N586 (2)

Text

. _ .

I a .

w. . =

h/29/86 To: Ti km.

T S liichaels J G Keppler Attached is a corrected copy of page 1 of Mr J W Cook's letter to Mr Berkov dated April 23,1986 (Serial 326h8). The last line at the bottom of the page was inadvertently eliminated when the letter was issued.

Please replace the incorrect page in your copy of the letter with the corrected page.

I am sorry fer any inconvenience this may have caused you. ,

u wh Linda Richards, Secretary Midland Project Engineering & Licensing N' C bg. <-

b-Qett f,u i

8605020200 860429

{DR ADOCM 05000329 PDR

<~..,,

i O. . I Corrected Copy l POVver O CORSUIRBIS Company General offices: 1945 West Parnell Road, Jackson, MI 49201 e (514 788 0453 u

m,

e. w c

,,,,u,. , _ ,,# ,u.,, .,,. .,

a.J Co.st,metson April 23, 1986 Mr Herbert Berkov, Director Standardization and Special Projects Directorate Division of PWR Licensing-B US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND ENERGY CENTER DOCKETS NO 50-329 AND 50-330 PIPE WHIP RESTRAINT DESIGN FILE: 0.4.9.41, 0.4.9.44, 1300 SERIAL: 32648

Reference:

Letter, H Berkov to J W Cook, Pipe Whip Restraints Design for Midland Nuclear Plant, Units 1 and 2, dated March 12, 1986 i

The referenced letter informed us that an allegation had been made concerning the adequacy of pipe whip restraint design and requested our response to specific questions regarding the design of the primary loop whip restraints.

Since the Midland Project was shut down, the project staffs, at CPCo, Bechtel and B&W have been demobilized, the project records have been collected and pinced in storage, and the people who performed this work have dispersed. At this time personnel who are technically knowledgeable of the design of the Midland RCS whip restraints are not readily available. Consequently, an effort has been made to address this request, first by surveying the records avai1able within CPCo, which do not include restraint design calculations, and by discussions with B&W and a former CPCo employee who participated in development of design criteria for whip restraints. To confirm any specific design approach in individual restraints would require considerable resources to resurrect the specific records at Bechtel.

Design of Midland RCS pipe whip restraints required the efforts of both B&W and Bechtel. B&W performed all analysis on RCS piping. Bechtel designed and constructed all pipe whip restraints. Since the load applied to a restraint is dependent on the stiffness of the restraint, the process of establishing pipe whip loads, and of designing restraints, is an iterative one involving the exchange of design information between B&W and Bechtcl.

This information exchange process benefited from improvements described in 50.55(e) report 80-07, concerning Reactor Coolant Loop Analysis. A previous 50.55(e) report, 80-04, had been made concerning (non RCS) HELBA restraint OC0486-0019A-MP02