ML20205E257

Requests Info from Gibbs & Hill in Order to Close Out Open Issues Re Pipe Stress Analyses Reviews.Encl Communications Rept Documents Initial Questions Asked on 851018

ML20205E257
Person / Time
Site:	Comanche Peak
Issue date:	10/09/1985
From:	Williams N CYGNA ENERGY SERVICES
To:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
84056.086, NUDOCS 8510170250
Download: ML20205E257 (3)

Text

l 6

V tm ca<wn a st.ee sa tre sa- 5 rmm c e -w sw F 5NK October 9,1985 84056.086 Mr. W. G. Council Executive Vice President Texas Utilities Generating Company Skyway Tower 400 North Olive Street, L.B. 81 Dollas, TX 75201

Subject:

Information Requests - Pipe Stress Analyses Texas Utilities Generating Company Comanche Peak Steam Electric Station Independent Assessment Program - All Phases

Dear Mr. Council:

Pursuant to our conversation on October 1,1985, Cygno is requesting information from Gibbs & Hill in order to close out open issues related to the pipe stress analyses reviews.

The enclosed communications report documents the initial questions which were asked on October 8. These questions are o result of Cygno's internal review of our issues database.

This datobose is comprised of open items and findings documented in observations, checklists, letters, memos and communication reports from all phases of the LAP. We anticipate that all other pipe stress questions for Gibbs & Hill's Applied Mechanics Group will be issued by October 18,1985.

Very truly yours, N. H. Williams Project Manager NHW:jst Attachment cc: Mc. V. Noonan (USNRC) w/ottochment 4 R Mr. S. Burwell (USNRC) w/ottochment Mr. S. Treby (USNRC) w/ottochment Mr. W. Horin (Bishop, Liberman, et ol) w/ottochment Mr. J. Redding (TUGCO) w/ottochment

$[ Il

.g

,q Q

c$

Ms. J. von Amerongen (TUGCO/EBASCO) w/ottochment o Mrs. J. Ellis (CASE) w/ottochment pf pu 3885! Bis $p ctf A

San Francisco Boston Chicago Richland

" ^

Communications it t Mi Report ,

lllllllll11llllllllllllll11lll

'\  !

l(

Company: Texas Utilities y Teiecon Conterence neport J N 84042 Coman:he Peak Steam Electric Station Independent Assessment Program - Phase 3 Date 10/8/85

! subiect T me a.m. ,

Pipe Stress Questions p:.,c,. '

SFR0 Participants-Of H. Mentel ,, Gibbs & Hill l L. J. Weingart CES Of t

item Comments Reg'd Action By

1. Review of the main steam inside containment analyses noted the following items:

a. Two LOCA load cases were run: unbroken and broken loop.

1

b. Unbroken loop loads and stresses were included in the emergency combination while broken loop was used

! in the faulted combination.

i

c. Broken loop loads and stresses were always higher than unbroken loop loads (as would be expected). ,

~

j \

d. The CPSES FSAR does not specifically require LOCA loads to be considered for emergency condition. 3, i

Why was the unbroken loop case run?

2. Review of G&H Project Guide PG-25, dated 3/1/83, " Procedure for Preparation and Design Review of Line Lists, Modes of Operation and Valve Lists," indicates that line lists are to

) be generated on the form included as Exhibit 1 of that procedt re.

Cygna did not find evidence of this during the reviews conducted at the CPSES site. Instead, computer listings apparently were used which did not have all of the informatior indicated on Exhibit 1 of PG-25.

Please explain the reason for this discrepancy and the manner in which the computer listing was maintained and controlled.

3. Cygna could not determine what tolerance, if any, was used for support orientation (i.e., angle) when performing the as-built stress analysis. Please provide this value and the reference document for it.

Segned-

]f[]} Page of Distribution: N. Williams, d.

n m,_

Ke001Dg, L. heingart, .) . 6Feo,y, d. Lills, b. tiu rwe l l ,

-1 n iu__ 3 __ n__ _ . _ _ _ . . _

vw wm

• s y -- --

gy

I

• s l l

l l

l

< Is l

A t

4 l

t ,

j m - t

^

4 O - C ( ( fl\ s 04Tisc L  !

1 i

. -  % .O b 'd

"'~"

(Y I

.' M - _ b b a<-W c [ f y -

i i

\ i Ca .e A S /,

j \ h t N , *c. C t

. .t c~ Kty;e W ( m,se C- J ( c r % % ( e t~ ee p, )

i

! l l

A u=mcece r i z ue f,ejfes nj ( =

c. c at ot e n t ,

dyyw ldu T A St.o n &(c/ Ochler 7 ' I s-G d i//< a - o -( e W. G macif ) En6ur & ~

f e p c s.1 s __ /?,p e Tlem A() y, ,,

I l

f /

,D[e c-=e c >=: e, c - c 4.

a- elec :

L