ML20205C315

Forwards Communications Rept Transmittal 18 of Repts Associated W/Phase 4 of Independent Assessment Program

ML20205C315
Person / Time
Site:	Comanche Peak
Issue date:	02/09/1987
From:	Richards J CYGNA ENERGY SERVICES
To:	Ellis J Citizens Association for Sound Energy
References
84056.109, NUDOCS 8703300155
Download: ML20205C315 (10)

Text

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s rbes 415/934-5733 2121 N. Califomia Blvd., Suite 390. Walnut Creek, CA 94596 February 9,1987 84056.109 Mrs. Juanita Ellis President, CASE 1426 5. Polk Dallas, TX 75224

Subject:

Communications Report Transmittal #18 Independent Assessment Program - Phase 4 Comanche Peak Steam Electric Station TU Electric Job. No. 84056

Dear Mrs. Ellis:

Enclosed please find some communications reports associated with the Phase 4 Independent Assessment Program.

If you have any questions or desire to discuss any of these documents, please do not hesitate to call.

Very truly yours, Jessamyn Richards Administrative Assistant JWR/jwr Attachments cc: Mr. 3. Redding (TU Electric) w/ attachments Mr. D. Pigott (Orrick, Herrington & Sutcliffe) w/o attachments Mrs. Vietti-Cook (USNRC) w/ attachments /

Mr. L. Nace (TU Electric) w/ attachments Mr. V. Noonan (USNRC) w/ attachments Mr. E. Siskin (SWEC) w/ attachments Mr. W. Counsit (TU Electric) w/ attachments q, Y h G703300155k (DH ADOCK 5 San Francisco Boston Chicago Parsippany

. Communications 4 t i Report 111111181ll1111111lll11111l181 Company: CES at Telecon O Conference Report

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Comanche Peak SES J b No. 8 4 056 Date: 12/11/86 suNect: Ti**

Meeting for Cygna to review S & W 3:50 documentation concerning local stresses Place: Boston

Participants:

of D. Van Duyne ,,

Stone & Webster +

R. Hankinson o, Stone & Webster

4. "nmminolli Cvqna item Comments Reg'd Action By Messrs. Van Duyne and Hankinson called to say that in discussing the Cygna review with A. Chan in their Cherry Hill office, it was agreed that rather than discuss the local stress data at the December 15 meeting, it would be better for me to review it at the S & W Boston office.

I will arrange a date with them next week.

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DEC 101986 warr, i

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Signed.

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/Vietti-Cook, of f

Distnbution: Williams, S. Tumminelli, L. Shipley, A.

,oro co V. Noonan, J. Ellis, J. Redding, deudb F.t.

Communications 4L 6 i Report 181111lll111111111111111111111 l

i company: CES E Telecon D Conference Report  !

Comanche Peak SES D*

12/10/86 suNect Meeting for CYGNA to review S & W Time:

3:45 documentation concerning local stresses pi,c :

Boston

Participants:

D. Van Duyne og Stone & Webster R. Ha nk i n cinn og Stone & Webster S. Tumminelli o, Cygna item Comments Reg'd Action By I called to establish a time when I could review S & W data relating to the application of PILUG, PITRUST & PITRIFE to local stress calculations per Attachment 4-6A of CPPP-7, Rev. 2. See also transcript of November 14 meeting, pages 88 to 95.

Messrs. Van Duyne and Hankinson told me that S & W was preparing a written explanation of this issue which will be ready for presentation at the December 15 in Texas. We agreed that it would be best to wait until that document is available before scheduling a meeting since it may address this concern.

k0iED DEC1.1986 man i

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' s ') i Signed.

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/ off Distnbution: N. Wil'liams, S. Tumminelli, L. Shipley, A. Vietti-Cook, j

toto co V. Noonan, J. Ellis, J. Redding, 84056 P.F.

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Communications 4L t i Report 111111lllll1lll1llll1111111lll l

l Company: cgg Ot Telecon D Conference Report Project: J b No.

Comanche Peak SES 84056  !

Date: 12/18/86 seject Meeting for CYGNA to review S & W Time: 4:00 p.m.

documentation concerning local stresses Place: Boston

Participants:

of Ron Klause o, Stone & Webster S. C. Ttmminelli og Cvqna item Comments Reg'd Action By We arranged a time for me to review the data. It will be on December 30, 1986, at 9:00 a.m. at Stone and Webster's Boston office.

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l 9 9 DEC

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' Signed; gk, j[ Page 1 of 1 Distnbution: N. Gilliams, S. Ttuminelli, L. Shipley, A. Vietti-Cook, ioro co V. Noonan, J. Ellis, J. Fedding, 84056 P.F.

Communications Repod 4L t i 11111111111llll11ll18111tlllll D Conference Report Company: CES $ Telecon Jcb No. 84056 Project: CPSES IAP - Phase 4 Date: 12/8/86 Time: AM Subject. Flued Head Analysis Observation p,,,, . WC PI-03-01 (Phase 2)

Participants:

R. Ballard, G. Weiss, A. Rakausky ,,

G&H P. Ward SWEC of L.J. Weingart Cygna Req'o Action By Comments item Bob called with respect to Phase 2 observation PI-03-01 which dealt with a modeling error in the I explaine d finite element model of the flued head.

that Cygna had closed this issue based on a review of 15 other flued head analysis and the determination that the error was isolated.

Cygna's main concern regarding flued heads was that review of the SWEC procedures did not provide any evidence that the new loads associated with the piping reanalysis would be reconciled with the existing flued head analyses.

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Page y of 1 s,gneo L.J. Weingart M /ta Distnbution. N. Williams, L$d Weingart, J. Redding, V. Noonan, S. Tummine:

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J. Ellis, A. Vietti-Cook, Project File -- .-- ._

Communications AL 6 i Report lilillllillHilllllilllllllill Company: CES O Telecon E Conference Report Project Job No.

84056 U

12/30/86

Subject:

Time Audit to Review Stone & Webster Procedures 9:00 a.m.

Place:

for Incal Pipe Stress Evaluation Boston - S & W Offices

Participants:

R. P. Klause, D. C. Foster, D. A. Van Duyne, og R. F. Hankinson, L. A. Budlong o, Stone & Webster S. C. TunYninelli o, Cygna item Comments Reg'd Action By See attached -

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/ /-  ? s2 Signed: '

[/ Page 1 of 4 Distnbution: N. Williams, S. Tunminelli, L. Shipley, A. Vietti-Cook, V. Noonan, so2 coo J. Ellis, J. Redding, 84056 P.F.

'*' SE 'haunineLli Ditk - 84056-CR - jd Page'1 of 3 he audit was conducted to obtain an understanding of the design / analysis procedures specified in Attachment 4-6 to CPPP-7, Revision 2.

An integral pad is one where the trunnion is welded directly to the pipe and the pad. S e pad may be installed in 1, 2, 4 or 8 pieces.

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A non-integral pad is one where the trunnion is welded to the pad'and not to the pipe. %e pad has no hole and is installed in one piece; two pieces if the pad is all around.

All integral pads are sent to the I M coordinator for disposition. All non-integral pads which fall outside permissible limits for analysis specified in Attachment 4-6A are sent to the I E ocordinator for disposition. h e I E coor-

'dinator is L. A. Budlong. All of these special cases may be addressed using

-detailed finite element models or using special techniques with the existing software tools, i.e. PILUG, PITRUST or PITRIFE. % ese decisions are made by the IM coordinator. PM-051 defines the procedures to track these spe-

'cial cases.

All programs, PILUG, PITRUST and PITRIFE are designed to analyze local stresses in the~ pipe without pads. Analysis procedures are designed to allow usage for cases with pads.

PIIDG and PITRUST use peak stresses for evaluation not primary.

All programs sta stresses per Table 4.8.1-1 in CPPP-7.

2 e M E values used are by analogy to the Class 1 branch rules.

Se procedure always requires an evaluation of the pad stress at the intersection to the trunnion or lug (referred to as point 1). Een the pad is not all around and the ratio of trunnion diameter to pipe diameter is greater than 0.8, the pipe stress at the edge of the pad is also evaluated (referred to as point 2). In other cases where the ratio is less than .8, studies have shown that if an evaluation of point 1 stress is satisfactory, point 2 stress will also be satisfactory.

In cases where the pad is not all around, requirements on pad size are imposed to insure that the conputed stress at point 1 is not influenced by edge effects, see IN-060.

Stress evaluation of pad, i.e., point 1.

Diameter is to outside surfact of pad.

- Rickness is that of the pad only.

Pressure is taken as zero. Finite element studies which explicitly model the pad and the pipe have shown that the pad takes very little pressure stress, since the pipe deficetions are too small to-load the pad.

All trunnion loads are input.

Pad sees sane ME stress. Reduction factor based on ratio of sect, ion moduli.

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Page 2 cf 3

'Ihe attachment weld, pad to pipe, is designed per CPPP-7, Attachment 4-2. . Only loads from the trunnion are considered. SEC took an action to quantify weld stresses due to pressure, pipe thermal and pipe mecha-nical loads.

Stress evaluation of pipe, i.e., point 2. Not required in every case.

Analysis is performed as though the pad edge is a trunnion, i.e. size on size configuration.

Diameter of pipe used for pipe

- -Diameter of. pipe used for trunnion

'Ihickness of pipe used for pipe

'Ihickness of pipe used for trunnion Full pressure stress used Only FY, FZ and MX forces used.

Other forces have been shown (FE studies) to produce negligible stress.

Full MI6 value used.

Procedure for attachments in fittings, Attach. 4-6A, Section 5.1.3.2, will be substantiated with a finite element study.

Procedure for use of an equivalent t equal to t plus t pad, Attachment 4-6B,- Section 3.2.4. is a practical judgement based upon SWBC experience.

• All User's Manuals,_ ME-095U for PILUG, ME-094 for PITRJSP and MFe211 for -

PITRIFE Were reviewed.

- - All manuals were emplete and provided clear direction to the user.

All manuals contained additional geometric restrictions on applica-bility in addition to those in CPPP-7. They are not in CPPP-7 because they are corporate requirements applicable to all SWBC projects.

- All programs consider all possible combinations of signed seismic components resulting in 64 separate load cases'for each seismic evaluation.

hhen beta is greater than 0.5, PILUG automatically increases the pipe diameter until beta equals 0.5. Analysis proceeds using the new diameter.

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8. 'hasninelli Ifidk - 86056-CR2 Phge 3 of 3 L- h n 0.5 is less than beta less than 0.6, PIT M fr increases the pipe diameter until beta equals 0.5. Analysis proceeds using the now-

' diameter. Finite element studies have shown this procedure to be conservative for all stress components except those due to torsion.

. 'Hence, the applied torsion is factored by three to correct. 'Ihis f value was derived fra the finite element studies. h n beta is greater than 0.6, PITRIFE is used.

PITRIFE uses a data base of stress coefficients derived from finite element analyses. 'Ihey are interpolated using the input gar =atry relative to the geometries used to compute the data base. Stresses are calculated at 24 points (every 15 degrees) around the trunnion at trunnion / pipe intersection. 'Ib correct for the possibility that -

stresses between the points used could be higher, all stresses are factored by 1.15.