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WIRoINIA Ex.ncruIc- Axn Powru CoxPm,

HIcstMo:tn,VInotxtA cGe61< w

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. March 19, 1980.,

Darrell.G..Eisenhut, Acting Director Serial Mo. 253/022580: Division of Operating Reactors . P0/CEN:sc. Office of Nuclear Reactor Regulation

p U.S.: Nuclear Regulatory CommissionWashington, D.C. 20555 Docket Nc. 50-338

Dear-Mr..Eisenhut:

NORTH" ANNA UNIT 1 TURBINE-DISC INTEGRITY

Your letter of February 25,-1980, requested informa-. tion about disc integrity in operating Westinghouse nuclearturb ines ~. .In particular, your letter included a list of"- Site Specific General Questions" and another of " Generic

. Questions."

This11etter will respond to the. Site Specific GeneralQu'estions'for Vepco's North Anna Power Station,. Unit 1. Re-.sponses.to the' Generic Questions, on'the other hand, have beencoordinated through a task force whose representation includesall ownersEof' Westinghouse-nuclear-low-pressure turbines and which

~

zis chaired by'Mr. Wayne Stiede'of-Commonwealth Edison. Theconsensus responses to the Generic-Questions are contained in.aJ1etter of' March 14', 1980, to you from Westinghouse's J. M.LSchmerling, a - copy of which' is attached to this letter (Attach-ment 4). If~Vepco has any comments:on those consensus answers,:

we will ' forward them to you by March . 24,1980. -~ '

Accompanying'this letter are the following documen'ts:

- Attachnent 1 Westinghouse's " Application for With-holding Proprietar~Public Disclosure"y Information from

'

: Attachment 2 - Affidavit cf. Robert Williamson in sup-. port of. Westinghouse's Application-for. '

Withholding.

; Attachment 3'- Vepco's Responses .t:o Site Specific-

'c -General Questions-;

'

-Appendix A!-iWestinghouse proprietary informa---

.

tion referenced inLAttachment 3n ,.. . ,.

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' . Wuosmar EttcTarc on Powen Cowr4nto .Darrell G.'Eisenhut~

20Lpages of Westinghouse-suppliedcomputer print-outs

2 tables of calculated crack sizes

Re"'. sed'Vepco Statement.on Second-ary Water Chemistry'for North

. Anna 1

-Affidavit of Jerome M. Schmerling

; Appendix B - Same as Appendix' A, .but with pro-prietary information deleted

Attachment 4 - Westinghouse consensus responses to Gen-cric Questions

The site specific responses contain proprietary infor-macion of thetWestinghouse Electric Corporation. In conformance.with.the requirements of 10.CFR S 2.790 of the Commission'sregulations,:we are enclosing Attachment 1, an application forwithholding from public disclosure, and Attachment 2, an af-fidavit. The affidavit sets forth the basis on which the in-formationLmay be withheld from'public disclosure by the' Com-mission. Correspondence concerning the affidavit or applica-. tion for withholding should reference AW-80-ll and be addressedto Mr. R. Williamson, Manager, Customer Order Engineering,Westinghouse. Electric-Corporation, Steam Turbine Divisions,-

-Lester Branch, Box 9175,' Philadelphia, PA 19113, with a copy,

to Vepco.

'Although most of our responses to the site specific.questions are undoubtedly similar to the responses you will re-ceive from:other -licensees (indeed, we have tried to be con-L

sistent with'the format recommended by Westinghouse to the taskJforce. mentioned.above), you.may find that the last two docu-ments Lin ' Appendix 'A to Attachment 3 are unique to Vepco. Theseare the1" Revised Vepco Statement on Secondary Water Chemistryfor North'-Anna 1" and the " Affidavit.of Jerome M. Schmerling."These'are. revised versions of documents presented to.the Atomic. Safety.and: Licensing ~ Appeal. Board for the North Anna 1 and-2. operating-licenso proceeding on February 18,.1980. The differ-ence between the. crack depths given in Mr.-Schmerling's affidavit

~~

-and.thoseEin!the first: 22 pages~of Appendix A1to Attachment 3v

'is' simply 1that, Westinghouse shas somewaat. revised its methods of: calculating: maximum expected crack depth wad critical crack size.- 'V

~ -The Schmerlin'g affidavit and'the Revised Vepco State-mentDcontainninformation proprietaryDto' Westinghouse and-should

:betwithheld from public disclosure 11n accordance with the AppealBoard's: Order of-February'7,:.1980, and.the procedure used here--

.tofode.inLehe operating, license' proceeding'.'

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s VinotwsA Ettera!C Ann Powsm Coxroy To: Darrell G. P v thut"

. . We shall be mailing yo'u'this letter today and deliv-~

ering 40 additional' copies-by hand. tomorrow morning. Please.let!us know if you require. additional;information. We shall-

do our.best.to' cooperate.,

Very truly.yours,

Cllgk2 $lygj gg _C, M. STALUNc3

C. M. StallingsVice President-Power Supplyand Production Operations

' Attachments:

As indicated

: COMMONWEALTH 0F VIRGINIA). . ) S.S.<

CITY OF RICHMOND - )-

Before-me, a Notary Public, in and for the City and-Commonwealth aforesaid, today personally; appeared C. M.Stallings, .who being duly' sworn, made oath and said (1) that.he.isia.Vice President of the Virginia Electric and Power,

; Company, -(2) that heLis duly. authorized. to execute and file:the accompanying..information in behalf of that Company,-

- .(3) that to ' the extent.. the. information'is within the. knowledge'of Vepco employees and officers it is true and cor-rect to. che best of his knowledge and belief, and (4) that thei

3

remain (e'r of the information has been supplied by the West-'inghouse. Electric: Corporation.

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Given under my_ hand and notarial' seal this 19th day--

|of' March,x1980..'

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.Myfcommissioniexpires- .

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- )Q _ q;;Darrell..G.tEisenhut" m" ;DivislonLof. Ope ra ting'. Reac tors'

, 1. 10ffice'of! Nuclear | Reactor | Regulation-

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(US" Nuclear Regulatory Commission'<

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7 ;WashingtonyDC 20555, _

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p y . # 4

'< >. APPLICATION FOR WITHHOLDING PROPRIETARY .~

,

% :INFORMATION FROM'PUBLIC DISCLOSURE.'

,

'

' Subject:f Nbrth'.' Anna' #1 Docket #50-338'*..

^ ' _'' Information in ResponseLto'NRC Request for Information of-'m

cFebruaryJ 25,1980, : Relative' to 1.ow Prsseure Turbine Disc .'*,,. , ,

.

-Integrity.: ., _ g

Refe rence: . Appendix) A letter:from' C. M. Stallings to Eisenhut,' datedV- 3/19/80'

.

. -

Dear Mr. Eisenhut:.. ~

'

,

This | application- for withhol; ding is . submitted: by Westinghouse Electric, ,,

~ ; Corporatio'n! (" Westinghouse'') pursuant to' the provisions' of paragraph (b)(1)> r

|of Section~ 2.790 of the Commission's regulations'. . Withholding from public,

: disclosure .is requested with respect ' to the subject information which is'

Lfurther: identified .in the af fidavit accompanying this ' application.'

. -The undersigned -has' reviewed [the. informati'on sought' to be withbeld and is*

" authorized to apply for. its' withhol' ing 'on- behalf of Westinghouse, STG-TOD."

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Thelaf fidavit accompanyi~ng this ' application sets. forth the basis on which the~

- informattori maysbe ' withheld .from public disclosure by ;the Commission andTaddresses with specificity the considerations listed in paragraph :(b)(4) of .- c

;Sectionf 2 ~ 790 of- the Commission's regulations. .-.

. ..

., _ t Accordingly, fit Eis res~pectfully requestedL that the subject information which .' ' *"

. fis. proprietary to Westinghouse: and which 'is .further identified. in the af fi--,C. '

, davit be' withheld ' from public ' disclosure in accordance. with 10CFR Seetion_ ,13 p; 2.7901ofLthelCommission's regulations.

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3'

; Correspondence withl respect. coi this ' application < for withholding or 'the accom-~

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, -:panying-affidavit should beJaddressed sto the undersigned.'

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AFFIDAVIT.,,

'.CCMMONWEALTH.0F PENNSYLVANIA'

-| COUNTY !OF: DELAWARE:

Be' fore'me,.the: undersigned: authority, personally' appeared. Robert-EWilliamsonk who,;being.b'y me duly. sworn according to law, deposes and<

.says. that he is: authorized t'o execute this ' Affidavit. on behalf of

. 'Westir)shouse.ElectricCorporation(" Westinghouse")andthatthe'

s -averments of fact set forth in- this Afridavit are true and correct .to'

' the best of. his : knowledge,_ information, .a'nd belief:

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Robert'Williamson, Manager*

Customer Order Engineering'

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$(1) IIDamIMana'ger,"Cust'omerOrder.-Engineeringin.the-SteamTurbine

.Generatorf Technical Operations. Division of. Westinghouse Electric' Corporation and as such, I~h' ave been specifically delegated the

' function:of reviewing |the proprietary.information sought to be*

1 withheld.from'public disclosure in connection with nuclear power

plant licensing. and am authorized to apply for its withholding on~ behalf of the Westinghouse Power Generation Divisions.

.

4

.(2) .I 'am. making this Affidavit 'in conformance with the provisions of~

210 CFR Section 2 790 of the Commission's' regulations and in~

conjunction with'the-Westinghouse application for withholdingaccompanying this' Affidavit.

(3). I have: personal knowledge'of1the criteria and procedures utilized~

by Westinghouse Power Generation Divisions'in designating informa-~

tion as a trade secret, privileged or as confidential commerci.1 or

' financial information' .

. (4 )' Pursuant to the provisions of paragraph (b)(4) of Section 2.790 of~the Commission's regulations, the following is furnished for con-

'

' sideration byithe' Commission in determining whether'the information. sought to .tHe withheld _from public disclosure should be withheld.

((i) The :information sought' to .be withheld from public disclosure.is= owned and has been held-in confidence by: Westinghouse.

,

(ii) :The_information is of a type customarily' held in confidence~

-- 'by Westingh'ouse and not customarily disclosed'to the pub-

lic. 'WestinghouseLhas'a rational basis for~ determining the.

types of information customarily held in confidence by it'-'

and,Lin that connection, utilizes a system to ' etermine when -d. ,. ,

L and whether 'to; hold certain: types of information in confi-, .

,

f g' 5 dence.: The application |of;tha't system and the substance of-p ,

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nthatisystemfconstitutes Westinghouse pclicy and provides *.he'

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rational Lba' sis r.eqEired'.'# " >.

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- Under'that system, fin' forma' tion is' held'in confidence if itEfalls in one or more S several types- the release of whichf-

might result:in the loss of an existing or potential com-

:petitive! advantage, as followst.

(a) The' information reveals the distinguishing aspects of a~

process (or component, structure, tool, method, etc.)where prevention of its.use by any of Westinghouse's

competitors without license from Westinghouse consti-

tutes a. competitive economic advantage over other

companies.

. (b) It consists of: supporting data, including test data,. relative to a process (or component, structure, tocl,

method, etc.), the application'of which data secures acompetitive economic advantage, e.g., by optimization

or improved. marketability.

(c) Its use by a competitor woul'd reduce his expenditure ofresources or improve his competitive positicn in the

design, manufacture, shipment, installatiori, assurance

of quality, or licensing a similar-product.

(d)- It. reveals cost o'r price information, production capac--ities, budget' levels, or_ commercial strategies of West-

?

inghouse,.its customers or suppliers.

'

S(e) It reveals aspects of:past', present,~ or future' Westing-house or customer-funded development plans and programs..

.of:potentialicommercial1value to Westinghouse'.-

..

"-- -(f) sit'contains' patentable. ideas, for.which patent;protec-

'

tion may;be; desirable.> '..

.$(g) It'.'is notsthe property of. Westinghouse, b'ut must be

:tr3ated as proprietary;by Westinghouse according to~

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! agreements 'with the owner.~

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I c(h) .Public disclosure'of this information would allow un-fair'and untruthful judgments on'the' performance and- :

reliability of,Westingho'use equipment components andimproper comparison-with similar components made by

: competitors.

_

There are sound policy reasons behind the Westinghouse-system which include the following:

(a) -The use of such information by_ Westinghouse gives We't-inghouse a competitive advantage over its competitors.

It is,stherefore, withheld from disclosure to protectthe Westinghouse competitive position.

.

(ts) ~ It is information which is marketable in many ways..The extent to which such.information is available to

g ' competitors diminishes the Westinghouse ability to sellproducts and services involving the use of the

-

information.-

~(c)>_Use by'our competitor would put Westinghouse at a com-_

petitive disadvantage.by reducing his expenditure of

resources at our expense.-

C 1(d) gach component of proprietary inforeation pertinent to-a particular competitive'. advantage is potentially as,,

'

-- ' : valuableias ~ the total- competitive- advantage. Ificom-

.:petitors 3cquire'componants.of proprietary information,(any one component may be the key to'the entire. puzzle,,, ,

.

:thereby' depriving ~ Westinghouse'of a competitive.~

.- advantage.. -

,

~

(e)|:IUnrestricted disclosure.would' jeopardize the position,

.

'of-prominence.of Westinghouse in--the world market, and

>thereby give:a market advantage.to'the competition inL'-

,, :those-co'untries.

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Nf)'TheWestinghouse;capacitytoinvestcorporateassetsinresearch and-development' depends'upon the success in,

-obtaining and maintaining a competitive advantage.

Iiii)'-Theinformatibn-isbeingtransmittedtotheCommissionin'

-confidence and, under the provisions ~of 10 CFR Sec-' '

tion 2 790, it is to be. received in' confidence by the

' Commission.

(iv) The information is not available in public sources to the

best.of our-knowledge and belief.

(v) 'The proprietary information sought to be withheld in this

submittal is that'which is appropriately marked in Appen-

dix A to letter from C. M. Stallings to

Eisenhut, dated March 19, 1980 concerning infor-

.mation in response to NRC request.for information of

,

February 25, 1980, relative to low pressure turbine disc

integrity.

Thefinformation enables Westinghouse-to:

.(a):. Develop test inputs and procedures to satisfactorily,

. verify the design-of Westinghouse supplied equipment.

(b)' Assist its customers to obtain licenses.-

Further, the.information has-substantial commercial value as'

ifollows.2

'

(a) Westinghouse can sell the .usc. of: this information to.

Customers.,

'

|(b)-) Westinghouse 1uses the:informatibn to verify the designof- equipmenkwhich is ' sold .to. cu' tomers.

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:.ience.' gained and the test' equipment and' methods<

. ' developed. .

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Public disclosure of this;information is likely to cause' ~

,

, substantial harm to the competitive' position of Westinghouse

(because it would enhance the ability.or: competitors to<i

1 1 idesign,' manufacture, : verify, Land sell ' electrical: equipment~

,

'forLcommercial turbine-generators without commensurate-' . expenses.-|Also,' publicfdisclosure of the information would~

-

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enable others.having the same or similar equipment to.use

,the information to meet NRC ' requirements for licensing' ^4 -

~

_ documentation without' purchasing the right to use the~

informa tion. ..H

cThe development of.the equipment described in part by the"

; information.is the result of many years of development by

- Westinghouse-and thefexpenditure of a considerable sum of

. money...

_ _

.This could only,be duplicatsd by a competitor if he were to~

. invest'similar~ sums of-money and provided.he had the appro-

priate talent available and could'somehow cbtain the.requi-- ~ ,

Jsite experience.~

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- -Further.the' deponent sayeth not.-'

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[1 SSITE5 SPECIFIC. GENERAL QUESTIONS ..

'.

.~on Turbine DiscfIntegrity:.

-North A~nna' Power Station,. Unit l'-,' , .

*4

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I' Providetthe'following'in' formation for-each-LP turbinc:'

.

'-

_

: Turbine' type-1I.A.. . . . .

"' The Virgi61a. Electric:and Power Company North Anna 1x

''

- . unit.hasLone' tandem compoundEfour flow, three-casing, con-

densing,,tl800' rpm turbine u' sing 44-inch last-row blades in

'each-low-pressure' element. The low-pressure element is

~ ' designated a; Building'-Block 281.4

. .

I.B; . Number'of Hours of operation for.each LP turbine at~

time of-'lastaturbine. inspection or.if not inspected,

. .' -postulatedLto insp'ection

. j The number.of hours of. operation from beginning~of op-'

,

'4 - eration until December 1,.1980, when the next refueling*.. ..

outage istscheduleci 'is 17,452..

I.C. -Number of turbine crips and c"ersneeds.,

There have been-37 turbine trips. There have been four

overspeeds,Jall'~ofLthem intentional for the purpos~e of| verify--

; .ing[the:overspee'dset' point.-

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.

s

, . LI.D. 'For eachtdisc:c.m

I.D.1. Type.offmaterial. including material' specifica- .

,

tions.

y_, .x, "s.. . | . .. .- . . . . ..

ASTM-'

- .-

:The materia 15is Ni'-Cr.-Mo-V. steel similar1to:'+ ..

. *Some fer.rlierf submissions have; us ed; slightly ( small.er numbers .:,f-

,,

'ofi op'eratingJhours fort North ' Annat 1.1 - The:JAffidavitaof.Jerome M.iw ,

JSchmerling3(part,of( Appendix' A"toTthis Attachment: 3) used 17,254.- .

,

%m 1Haro.1diRi.(pco'siletter = of February 115, 1980. (Ser. 7hours. fVe~

No.cl-37) tos..

q, Dento,n?used217,,276.m - . <

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'f A- 4 71~. 'The minimum 1yieldystrength?specified for...each', - . .. . .,

-

,

'disciis givenfin(SectionLB of Appendix Afto this-# A ~

' Atitachmenti: 3..' "'

- gI . D .' 2 . Tensile properties data- '

..+LTensiletproperties' data of'. tests taken-

'

-. ,

Jfrom, theidise lidbland. rim material:are 'given in- Sec->

- ~ tion's;;BTand'C,;respectively, of' Appendix-A to this At-

itachment 3. ~

'

I.D.3. ~Totighness; properties data including Fracture.

. Appearance. Transition. Temperature and upperenergy and' temperature

Toughness properties for.the disc hub and rim are,

,

. .given in Sections B. and C, respectively, of. Appendix =A'

^

to.this Attachment 3. The upper shelf energy is not

presented in this Attachment.3 when it is the same as<

g,

Ethe room temperature energy.- ,

.

I.~D.4. ' Keyway temperatures

- The keyway-~ temperatures cre presented in Section'

~ TG"of Appendix A to.this' Attachment 3. The temperatures

given are theJealculated-temperatures two inches from the

exhaust face of the-disc-at the bore during full-load2

koperation with all moisture? separator reheaters in ser-'

-vice. Note-that these - aref the same ~ as - those lis ted.:in" ~

_ :the ~ Affidavir of 7Jerome? M. Schmerling (part of Appendix'

:Aitothis-Attachment 3)exceptforadifference.ofl'F_ , .

.

'

;in;theitemperatdreilisted.for' disc 1.- 3;

.g f .W. , . . . .-

- '

~Notefthat'ithe'first120Lpagestof Appendix A consist-off~

}Westinghousej(Forfexample,7computeriprint-outs, each .with' separate . s ections'' ;

ASchrouginG Section A 'is:o" Unit Iden tifica tion . ")~:., .

?It ois. to t:those) sections' .weirefer'to when :we.: c, ite , forf example ; *

Q ~ 1Section6BfofcAppendixlA?tofAttachmentf3.). -

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I . D~.7 P Calculated 1 keyway. crack size for turbine: tim'e5- !scecifiedlin*"B".above-': '

,

;.

,- - The; calculated! maximum keyway crackisizn is- >

v.'

;designatedlitem:G-3,'in keeping'with the notation_

" suggested;byLWestisghouse, and-is-found in Appen-2

'

Tdix-At to this Attachmentc3. G-3--is. calculated by.-

_

*p/ ' multiplying thegnumber_ofIhours of operation (see I.B -

:above)?.by:the crack growth rate.da/de. The crack-.

_growthcrate.is: calculated-as' described in-the re-

sponse.to-I.D.8 below.

'I.D.6. Critical' crack size

i- The critical crack size at 1800' rpm and at design--

,

-(1207.)~overspeed is given in Section--F of App'endix A.w

,to this-Attachment 3.

I.D.7. ? Ratio of calculated crack to critical. crack.-

sizas..

.

The ratio of-calculated crack size to critical

. . crack size, afacr.(eff),Lis designated G-4 and~given--

_

Lin Appendix-ALtoLthis Attachment 3. This:num-

-beriis:celculated-simply by dividing-item'G-3 by. item;F-2.

:-I.~D18. -Crack growth' rate9 ~m ,

Thescrack growth rate 'is' givens as: G-2'' in-x -

3,

- LAppendix A tofthis --Attachment = 3. These1 crack growth-

,

~ "u- , , . . .

.

' ~

crat'es1are the maximum: expected rates based upon; , ,

sh^ iknown cracksito date.'

' ' - 4 <

.#'

'..1 -

_! Westinghouse h'as changed-the. basis.for determin-' ~ ' ~''

_

V ; i }| ., +- .,-

4 . ying7 thes'e rate'sl to u'seDthe:dNRC ''grayf book" operatingm

';<+

.- r -

,

. | f* .'

z ,

J;_ ~

le~

*mw c -

.,. . -

f=v%|gy ' e ' - -- = . ,

' f~ & a'"

7 . m - -

;'

.

e_

m ga <. .~-. h,

- , m y; - :.c,. ..

m.-- ,, -

y : ..4.-- ,. . .; ;

--

, . . * *-

3:,,'7, . .'

.*

,

%: "^ *>j. ;;; 'T-,

' . g -|- I, ,; r ,

_

,r

O'-,

k,s '

s ., y ,

3 +'^ <i

i hIours JThe"IlRCdvalito Xorf the crack growth ratolis, given' '; .'s .. . . ..

;~

-

--

- .. - :aavitem G-22onJehe-computor print-outs 1(first?20 pages-of.. , - ~

. a

_ -)< - [AppendixiAJ| col chis f Attachinerit..?3)i : Becausc D Wee tinghouse| s.

.

-4 .. m

a+[ _ -7 1 crack 3growthirstestover>the relevant; range are consistently-$ larger!'than;tho? RC| values,.Lhowever, the Ga2' numbers from''

s~ theLprint-outsJhave/bcen multiplied-by a factor, pro--~, -

k |}, ~ ' fvi'ded in: Appondix A, t.o1 yield the moro conservative G-2.'. . .

. o'

' figures,1whidhlare.-also'givun in Appendix A.,

,

Westinghouse'Isfopinion-is'that'the crack growth''- ,

_.

' rate of discinumb'er25 for North Anna 1 should'be as-, _ , <

.sumed it o :b.e zoroJbecause this disc operates dry und.or-., _ ; ,.

.~ normalfconditi6ns. .Howevor, to be. conservative .'(and'*j

'

' consistent:wi'th ih'o calculations for4the other discs),. x e

'

:Vepco has calculated alcrack size for disc. number'5,-

;'w _ - ;using/ the'.same? methods as7for the--other discs.-

.

JI. D. 9.- Calculated boro'and keyway: stress at operating_c

]g ~ : speed and' des ~ign overspeed."

- . The bore; tangential stroscos at 1800' rpm and at,,

; design ~1overspeed;are fiven in-Sechion E'of' Appendix~,

+.i

. LA to- this.' Attachment |3.- The values presented. include-. n

?5 , the% stresses'due;tocshrink. fit and centrifugal forcei

iloadsTonly.. JAdditionalvanalysisL.to-include thermal-''_a

.

, _

k, stressesfandjpressureistresses are,being mado-butfares - :

y: - .s_ . ,

,.

-.;

-' ; - inotlyeti avail'able .; ~

*' '

; w C. .t '. . . .

~.. . ... ,

%: yg, .. , . iWestingh.ouselhasin~ot provided thc1 keyway ~ stresses,.. . . - . .

.

.I -- ibe'caus~elWestinghouse'slanalysisi. assumes thatithe kayf,

' ,-

_ _ _3 - ...,

/ ,5'-

g

[' s - -.

,

jy q:sv _ x; ab -'"

-,

-- s _ > , -.n'-

,

, :sy .>

-

AA y

s t :; ,~

4.f

.yf '~ , >. ''

s

, ~ , ., , ~- '~'

33 -~ , + <

L_,-- , ' . , ,... >

< ,. >

^~ Y

_

. ? 2. .s-j ' ~

dj

, -m s .. ,r- - .-

. , _

-_ ,p;c , , , ,

,f .n m.:. , n' ~;-'., .. -* *

- u,.

,

-

, , -5-;

JN ~ ': - ... a w.

-'

y. ,

u, ,~ ,

',

., !way)isSpartlof the': crack, Rand 7so1the:onlyisignificantc -

-

_ .i. . - ^,

'

1s tres' 31$ tiie: b' ore . stress' ; ^ ~, 's..

mYd E, *

. , . ~ . . . , . . . -, * ..

~ data-,

y I;D;10( : Calculated!K.'

IC

['

[ ; The ifract ure : toughness ,2K ffe ch; disc is.<

. IC,

calculatedifrom:the Charpyfv-notch-and tensile data..g

~1The values, presented,in Sections ~B:and.C.'of Appen --

cdix!A to this Attachment 3,-are calculated.at the-

g. 1, upper. -shelf Ttemperature;or room : temperature, whichever -.g

givessthe lower 1 result.

:'I.D.11. Minimum yield strength specified for eachdise"; - -

~

The values-for minimum ~ yield strength are pre-

rsented'in Section B of App.endix A..to.this. Attachment.

- 3 ~. :

II. Provide-ddtails of the?r'esults of any completed. inservice: inspection o~f LP: turbine rotors,' including areas examinedisince' issuance.of'an operating ~ license. ~ For each indica-tion detected; provided- details of the location of the

J crack,'its orientation',;and' size.

*North 1 Anna Unit.1 wasTput(into service in 1978- and has not-

-

|yet had-Lits LP, turbines inspected-by current Westinghouse tech-"

, '

nique~s.= aVdpco| plans 7 o have";the1LPLrotors inspected ~during'thet

t

next7refuelingjoutage,: scheduled for-December l', 1980.,.

*

,

+n -

^ '

,.

' ~ =Initialj criticality . April:: 5, 1978 ; .firstLcordercial op- -

Eeration:JuneD6,il978,iful.1 thermal: output August.126, 1978._

?~ ; ~

:-

,~ je~ '

|, ;7

. * n. .

*.

,

'.

, n .s < . |,

,

- > .|

d,

-

g,

'

, , g| , |~''.,

*,

.' , , -'

f P

-

f:, -, _?

*

:- .''

,,. ,

9-Y s 4 *

a '

-m - y s:s ,

g ;.= ;& q p ' y _- '

~

3:r - .'

ig- n_ . , ._ . : ., . .

,e-6 1.

._ ,pp= :, . ,

;n -

_ .

--

,

*~ '.r , s ' - ?rr

~O g {- ,'.,'_t. ;,..- * * ="

., _. _

* .. cj .y3|N?

-

-

?ProvidestheTn.o' inalfwaterf chemistryiconditions for;each,'? IIIi:

. _

m.

K M. . 3 2 ELPfturbine andTdescribeJanyi: condenser:inleakages or'-other~

.:N |signific' ant | changes in: secondary; water chemistry to :this -' '

UK-

|icrackslint:anyfgiven turbineTas related'to.historyfofpointrinlitsfoperating. life. Discuss'the. occurrence of"~- c,

: secondary waterEchemistry in the' unit:'.

_

hc \' X % 9endixiA tofthisJAtt'achment 3Lincludes a n'' Revised Vepco'

,

.- StatiementhonfSecondary Waterichemistry for North Anna:1,'" whicht

~

f Ifaire91sediversion'ofla review ofjsecondary water chemistry' '

i

Jthdthwas presentedJtolth'e Appeal Board on February 16, 1980--'

.

'

lIthhas';?been:- revisedL somewha't since then both -. to- take account- of~

,,.

' '

/newerfWestinghouse? operating recommendations, to elaborate.,

on gepco(s v'iew"ofL ho' significance'of'the secondary chemistryt

tofdisc': integrity,cand- to'll'stninstances of ' condenser tube plugging.+ <

u.,

'

- IVO .IfFjourfplantchas,notcbeenfinspected, describe.your-pro-:*

poked | schedule an'd' approach toLensure that turbine crack-ring does'not exist in you'r turbine.e

(Vepco'ispresent.LscheduleLisJtoinspect the LP rotors.dur-u. ..

. - ;ingitheLnext refueling' outage, which is scheduled for December, , l',?1980.: Vepco's approachlto ensure that unacceptable cracking--'

doesJnot existnisLbased on calculation of the ratio a/acr$*ff).-

,

fornth~e. worst-case disc in order ~to?be sure that the ratio is_ ,

il'essithan"un'ity;. JA calculation'! o' determine the? number of hours-t

1that"thenworst'-case:disec(disc ~no.fl, governor end, LP 1) could'

'

-

- :oper' ate %eforefalabr(eff) Yecame .~ unity, Cusing tthe values of-

[ jacr( ff) and da/dti ffom AppendixfAL .to: this . Attachmerit .3, yields .m -

.

v - ' faSresul t cof f40[429j hours . :.

%~

,, . - '3 ' '

i e

'

-

th ' _

' '' '

'

t%^

% ; - -: ;,

: --

-. : w

~~

,,; g ;^ &; - .

'

k ;Q { Q ' ' ~, . |

''

<, , ,.m-m -

3 __

gYi . - .-w # .n . , ._ s

'( +Y ,yQ:( l''

' ' - . . , _ [ ^ *

' ' ~.s

_ ,s , , , ; i_

-*'

. , -.s.- - , 3;-,

- . - ,3, ,,c

_ $f -{ .''

". ," ' ~ ~'

-_p- , . q,q q . ..

,w , ;,..,

, ;;7_ _

,-

'| _ ; g ^y x - ,, . . ,-

,

, ;,g r .~ . ;,

,' m.,. . ,

| - cy *;X_' : .''

; ', + -

, - w, . A: :m-

[?cw dhjIffy^ourgpl' ant Lhas ieena:!inspectdd and plans to" return or.

; *j + ? ';

~

k shas9 returned (toipower[with cricks," provide:your-propo~ sed'~

%"E ?:for' this inspection' schedule.ischeduleifor-thetnextsturbine: inspection.and the-basis?-

.

, ,

'# 'r '

ppV ,

/' f EThe;plsntjhasinot?be_enfinspscted; iSee; Questions III;and-' ~

.

m ~. #

..

JIVfabove; .p"-~

' '

4 1 ,u'i T^ g, - , , _ _ ,

:,>-, , . . . .

. -A._ ~ .. -. ~.

9 <^ . SVIi ;Iddicate?whethereanianalysis-and' evaluation regardingJ { turbine? missiles 1ha^velbe_eniperforme'd/for tyour: plant ,and.4 c provi~deds tof the'-' staff. . ?Ifusuch'an analvsisLand evalua-

M^.

' i'Stionthas beks; performed?and reported,:please provide _ap-g* ', Epropriate references: tof t-he 1available -~ documentation. In, -

<.

'' : the . event' thatisuchis tudi' s have not- been made, ' consid .' : - e,- >eration4should?be'givenE to'schedulingasuch an action.e

SpP (N ' in'analysisLof the~turbineDmin 'le risk for North Anna-la,

.

~

Land 2s.has1been done. ~ Thenbasic: anal.,.is'can be found in the1

' NorthiAnnallSand 2 Final Safety Analy' sis Report 5 10.2.1.

cv . eThis analysis' .was- the> subj ect -of a hearing before the

1 ?At'omic3SafetyLand Licensing Appeal Board ~on June 20, 1979,-in'

~

lh NorthLAnnalfa.nd.20operatinglicense.proce.eding. Testimony--t,

J Hon ;th'e 5 North:|Annai turbine missilef analysis was - pres.ented; both.

Tby yepc.o andktheTNRC)Staffrand isipart'of the record of that-b~'

-

_

.. .

.

T y : proceeding. Also,abasic data usedLby Westinghouse in:its' pro-m. _

.

~

bability? analysis were; submit ted. after the hearing _ un' der the_

x

-[' ~ {termslof. ~aiprotective'.. order; issued by;theJAppeal Board (ALAB-~

.

, k r.(55'5,3 atedsJulyr,13,$1979).. lThe?AppealEBoardLhas recently-been'' ~~

w . , - - ,- . , ,

}

pin' formed (that Vepco'|sTtes timonyf wi11 'need(to be : supplemented -~- ~'

n. , ;,. - ,

y [, m lin[l'ight dfhmore rec'entiinformation,: bothionfturbine. missile-T

w . ' m_m w- -

~,..,

'I- -.

. . ,; ':4;%)U' qexit(energiesJandEonlturbine?: disc crackingi IAdd_itionaliinfor '. _ , , , . . .

L,- ~, - . .w. ;: .. . . . , + . .v., ,

n u.~ ~'..

, ,

j ,mationiisit'o?be(submitte|ditolthe?AppealjBoardab|y; March 2~ 19.80. ,,

-u _, s ,-

_ .,.

~[ ~ , gg,' .i,t-

g, . ,

_, Q2 ~ Y' ''' '

'W| ''

>

r:n n-u,,

','

> < ,,

r I : .| ,}-g . ~.*

,

.E yMNfe sa m ; vy( * , ' <- ,,' ',

,,ap ; + r, ,

a 2," ' *

op ,a , u , ,*' %,y )

, , ,4 qs.

- *,t ,t - p y

~_{ . h. __ _ [ .. .4". +

, . ,o ( . m 4

y , e._ ,. . . . . . . - . . - ~- o . - -

.% e_: oA