ML19319D965

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Forwards Addl Info Request Re QA Program & Design Change in Tendon Sys
ML19319D965
Person / Time
Site: Rancho Seco
Issue date: 09/10/1969
From: Morris P
US ATOMIC ENERGY COMMISSION (AEC)
To: Davis E
SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8003270660
Download: ML19319D965 (9)
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qp 1 C EU Docket No. 50-312 CPPR - 56 Sacramento Municipal Utilities THIS DOCUMENT CONTAINS District F. O. Box 15830 POOR QUALITY PAGES Sacramento. California 95813' Attentions Mr. E. K. Davis eeneral Counsel Gentlemen:

on July 14, 1969, you filed supplement No. 2 to the Preliminary Safety Analysis Report for the Rameho seco Nuclear Generating Station Unit No. 1.

This supplement described a change in the type of tendon system used for the reactor containment building, change in containment liner material'~ and in the type of cooling

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towers used for power conversion system.

We and our consultants on structural design have reviewed Supple-cient No. 2.

We fhd that additional technical 1:. formation is required on the proposed design change of the tenden system. The specific information required was discussed with your staff in a telephone conveniation of August 26,31969 and is transmitted as a c..' M '

Inclosure No.1;te this letter.

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You may also recall the request made in our June 17, 1949 letter

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far a written description of your eurrentl quality assuranee program.

..You may wish to include that description iwith your respeese to 1,,..

.Bneleeure Noi '1.

We have discussed.the Ranske Seco'qualitynassurance <

"N program with"your staff at_ thei June ~ 18,'1967 meetingf at' Bethesda',

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- soments bee' d 'on surf uederstanding of your-l,Q$ progr'a

f Marylandand'~insubslequenttelephome' conversations.' W m'aindf tiansmit ':j[h'p e

them herewith as Inclee.ure No. 2 for your consideratiion.

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ENCL 0gURE NO, 1 l

l Recuest for Additional Information on the VSL Tendon System

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Provide a detailed review of the extent to which the proposed VgL anchorage system meets ACI-ASCE Committee 423 " Tentative Recommendations for Con-crete Members Prestressed with Unbonded Ten 4cas." Where tests supporting "the suitability of the system'are described, provide ~the' detailed test ' N. [

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-data as attaehments to the review.

2 We understand that the Swiss Government has developed a set of requirements for tendon systees, and that 'the' VgL design has been evaluated with resp'ect to these requirements. Please provide a detailed review of the extent to, l

which the proposed VSL system meets the swiss requirements.

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Provide a detailed description of the V3L system to includer material f

composition, manufacturing process, heat treatment and dimensions (including tolerances) for bearing plate, anchor heed, wedge grips, trumpet and tendon (

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Indicate the IET requirements that will be imposed, the basis for these f

requirements, and the techniques, compling procedures, and standards that

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  • used to qualify the material to these requiressets. Indicate, 7'

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sir. the attention that will be given to avoidance of stress concentra'tions an..setch effects' such as misy be dwe to flame eutting and welding.

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.fr Mn g.@.}p4' c. ', Qp?:; ; 4.;g ;;g@dO.Q$%?M4Td g Provide additional discussica on the performance capability of the.~VgL

.f # l system with regard to ductility,. ultimate' strength. eye 11e loading', and$

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.the capability of the system to maintain less term load without delayed <

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Be'eribe all applicable test,datafsupporting i

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l: failure er emeessive relamation.

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c.the 'elaimed' system'perforesase capability, imeluding sufficient inforestieel.

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"on'the materials and geometry of theitested assembly EE. verify'that"the3;;fl.9 %

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, J.msterials used and the feature,e of,thelessembly areienede&peselstegteg.)y$g

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specifications' for'the propeeed syst_en to, permit their aseeptance,as,velid yyp w:ij%7M.; &m%y.&g;qu&v
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Evaluate tiie potential deleterema effects that manuf.netrains and field-'

~d' induced' variables may have.s_e.the;performenee of the system as determined M-l s

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Discuss the attention that will be given to strand arrangement and twist in curved tendons. Evaluate the potential deleterous effects that the selected arrangement (twist and curvature) may have on the performance of i

the system.

8.

With regard to the propeeed corrcaion protection system, document The experience available for the corrosion inhibitor proposed, s.

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The eapebility of tN eorrosion inhibitor to penetrate between, and **"

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provide' protection for, the wedge grip-strand interface, and The provksions that will be made to accommodate corrosion inhibitor '~

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Clarify the reported "Fercent of Guaranteed Ultimate Strength." Also, tabulate anchorage efficiency performance data on the basis of actual '

ultimate strength of strand for any data reparted.

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10. Provide a detailed description of the quality assurance program for.the VSL system. Include a description of the quality assurance organizacion and the measures to be taken to assure an independent design evaluation.

Describe the quality control measures to be followed to include specifically the measures to be applied to quality control of wedge threads, taper angle,,

anchor head, tendom easing placement, tendoms tensioning, and wedge to neekor-head interface surface condition.

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11. Indicate the provimiens to be"taken to ensure' proper eentering 'of the"st'ress,

head on the bearing plate to avoid high local stresses.

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Provide evidence te_show that wedge.amehors (with mezimen wedseptiset),.

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remain stable and' ae strand slippage oseurs wii:h sudden reducti~en~ef,tendes ~.

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ENCLOSURE NO, 2 Ceements on the QA Proares for the Rancho Seco Plant 1.

Ormanisation (Frecedure No. 1)

Se 3931D organisation chart indicated that the Quality Assurance a.

Director (QAD) reports to the Assistant Chief Engineer (ACs) as does the Project Manager. His seems to satisfy the requirement for organisational independesse of, the QAD3 however, in discussion

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of procedures L(i.e., Procedure No. 20) the ACE sad the Project Manager were defined as one and the same. Is it stRID's intent to

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tiemal responsibilities associated with each of these positions.

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Sufficient detail was not provided regarding the techtel organisation.

In particular, in your submittal a chart should be included to show the relationship within Bechtel of the cometructica, engineerias, and W"

quality assurance functions, and the position of the Rechtel Project Manager.

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c. <It is necessary that, the Beid organisation be shown. ne relationship of 335D Bechtel, a,nd Bear should be clearly indicated.

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2-b.

Discuss the review and approval procedure for the cl.asificatica determinations made by Quality Engineering and the design engineer.

,c, c.

provide as complete a listing as possible of all Cless I items to be severed by the QAP. Indicate the organisation which is responsible

,for each activity for each item from design through final test.i_ng.

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Does BW procure its own NSSS components and therefore perform its supplier QA evaluations?

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Confiauration Centrol (Procedure No. 7)

- Q:2 m.,. -

'C,.,j The procedure should clarify stEJD's policy relative ' e the sequencing of s t

chasse issuanee and its implementation. Consider both field and office-initiated changes.

7. +.-

5.

Docuneetation Control Center (Procedure No.18)

.w Provide further description of the " master documentation systou plan" with particular reference to the. types of documents to be retained and the 7

duration of record retention.

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1 one for Cenerete Members Prect mmittee 423 '*festatwhich the pr t

e tailed test data asseppertieg the suitability osed vsL the ressed with tFn Recom of the system er '

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attachments to the rev ribed, provide L Where Provide 4

estailed roe,iew of the extent to whi a

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2 4 standards that will be weed y

techmi 1 be impeeed a.

meets.

, saepling pr,eceduresthe beeis for of streesIndicate, also, the

.g y e qu ify the material to thes, and 3,; u.

cutting and welding.-concentrations a

ion that will be 51 e require-j,@j, and effects seek as 9em.te

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m timate stremath, ayellefjthe, dp,;m, m ten te

' data empporting the ma e s taie'lems term le d withe leed'ing s W

'sefficient inferentism, the

.cla Describe system perfe e

all applisable teeteatl,d A assembly te v seeembly are~ erify that he memeterials,.

sapebility, imel.eding) e y f.

f proposed sys...

tesials;uesd' try of ths. tested.

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44 4

ENCLOSURE NO. 2 Comments on the OA Prograve for the Rancho Seco Plant 1.

Ormanization (Procedure No. 1)

a..The SMUD organization chart indicated that the Quality Assurance Director (QAD) reports to the Assistaot Chief agineer (ACE) as does the Project Manager. This seemse to sat fy the requirement M

h for ernanizational_'

-- the QAD

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di N scussion.of procedures (i.e., Proced e No. 20) the ACE and

, Ye tw Project Manager were defined as e and the same. Is it S%s intent to maintain this defi tion? Provide further descripti i the or i

i l

sponsibilities associated

%
  • gan zat ona with each pMq Vs1 **'lt%

b.

Sufficien detsil was no.t M ' ' '- gthe Bechtel organization.

w w

^

In particul

, in your subiait al a chart should be imeladed to show the rela ionship with chtel of the cons tructisa~,' engineering, and quality as rance funct ons, and the position of the Bechtel Project Manager.\\

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It is necessary tha therBW organization be shown.

e.

. Therelation-[j, ship of SIED, Bechte

.B W should be clearly indicated.

Qg d.

The qualification re si ts for the key QA personnel in each.

L--

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. major organisation s oul be presented.

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Desian Review (Procedure No. 2)

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Bow does the see of drawings specifications know that final' m.TY SIWD approval has been granted see it appears 'that the check 2 2' E -

^11st-is not a reement part of t ' document)?

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ign review activities,asg: q

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jspecified by heir internal operating rocedure' will be nec.essary;.'ggy

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What is the '

tomt' of Bechtel's review

...the BW design documsats?

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'Esw will ts to the PSAR be reviewed t assere their accuracy'

'med completeness?

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Will any specific procedures be ' established for handling the design e.

interfaces between systems, components and structurcs?

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3. ' Osality Assurance Class'ifications' (Procedure No. ' 3)

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_onuet' ciato a Class I_ or II,_ category will be required.

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- - ' - - - ~ " ' """'

_.. _. -,. - ~ - -

b.

Discuss tae review and approval procedure tor the classification determinations made by Quality Engineering and the design engineer.

c.

Provide as complete a listing as possible of all Class I items to be covered by the QAP. Indicate the organization which is responsible for each activity for each item from design through final testing.

N d.

Does BW procure its own NSSS components and therefore perform its\\ supplier QA evaluations?

4.

Csefiaura on Control (Procedure No. 7)

,g

+.

The procedure should clarify SED's policy lative to the sequencing of a change issuance and its implementati Consider both field and W',

J '" @!?

office-initiated ' changes.

s.

" ~

5.

Docamentation control Center (Procedure No. 18)

Provide further descrip\\tica of the master documentation system plan" with particular refersaceN o the pas of documents to be-retained and' t

the duration of record rete'atti My

x -

6.

General Comment wt.ichrequiresestablishmembof That portion of AEC QA Cri rion X an overall test program fd the pr(oJhet

.,f addressed...

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