ML19312D184

Forwards Info on site-specific Generic Questions Re Turbine Disc Integrity,In Response to NRC .Certain Westinghouse Portions of Response Withheld (Ref 10CFR2.790). Application & Affidavits for Proprietary Status Encl

ML19312D184
Person / Time
Site:	North Anna
Issue date:	03/19/1980
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Eisenhut D Office of Nuclear Reactor Regulation
Shared Package
ML19312D185	List: ML19312D184 ML19312D186
References
253-022580, 253-22580, NUDOCS 8003210422
Download: ML19312D184 (17)

Text

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Uf' 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 Commission Washington, 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 nuclear turb 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 General Qu'estions'for Vepco's North Anna Power Station,. Unit 1.

Re-

.sponses.to the' Generic Questions, on'the other hand, have been coordinated through a task force whose representation includes all ownersEof' Westinghouse-nuclear-low-pressure turbines and which

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zis chaired by'Mr. Wayne Stiede'of-Commonwealth Edison.

The consensus 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

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-General Questions-

-Appendix A!-iWestinghouse proprietary informa--

tion referenced inLAttachment 3 n

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

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20Lpages of Westinghouse-supplied computer 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 - 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's regulations,:we are enclosing Attachment 1, an application for withholding 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 addressed to 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 task Jforce. mentioned.above), you.may find that the last two docu-ments Lin ' Appendix 'A to Attachment 3 are unique to Vepco.

These are the1" Revised Vepco Statement on Secondary Water Chemistry for 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 3 v

'is' simply 1that, Westinghouse shas somewaat. revised its methods of

calculating: maximum expected crack depth wad critical crack size.-

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

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

.tofode.inLehe operating, license' proceeding'.

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-V' s VinotwsA Ettera!C Ann Powsm Coxroy To: Darrell G.

P v thut

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

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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. Stallings Vice President-Power Supply and Production Operations

' Attachments:

As indicated

COMMONWEALTH 0F VIRGINIA)

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S.S.

CITY OF RICHMOND

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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 the i

3 remain (e'r of the information has been supplied by the West-

'inghouse. Electric: Corporation.

r Given under my_ hand and notarial' seal this 19th day-lof' March,x1980..

.Myfcommissioniexpires-j

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.Marchi 14', 1980.

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_ q;;Darrell..G.tEisenhut m"

DivislonLof. Ope ra ting'. Reac tors 1

10ffice'of! Nuclear l Reactor l Regulation-(US" Nuclear Regulatory Commission'

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WashingtonyDC 20555 p

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. APPLICATION FOR WITHHOLDING PROPRIETARY.

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INFORMATION FROM'PUBLIC DISCLOSURE.

Subject:

f Nbrth'.' Anna' #1 Docket #50-338'

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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,' dated V-3/19/80'

Dear Mr. Eisenhut:

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

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

> r lof 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

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

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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--

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davit be' withheld ' from public ' disclosure in accordance. with 10CFR Seetion

,13 p; 2.7901ofLthelCommission's regulations.

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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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Customer Order Engineering" -

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AFFIDAVIT.

'.CCMMONWEALTH.0F PENNSYLVANIA'

-l 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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l J Y. m-Robert'Williamson, Manager Customer Order Engineering dwed, d m $9 xnnJ betas mt

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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 lthe 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

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

conjunction with'the-Westinghouse application for withholding accompanying this' Affidavit.

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

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by Westinghouse Power Generation Divisions'in designating informa-

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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

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'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 lof;tha't system and the substance of-p nthatisystemfconstitutes Westinghouse pclicy and provides *.he u

rational Lba' sis r.eqEired'.'

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Under'that system, fin' forma' tion is' held'in confidence if it Efalls in one or more S several types-the release of which f

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

petitive! advantage, as followst (a) The' information reveals the distinguishing aspects of a

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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 a competitive economic advantage, e.g.,

by optimization or improved. marketability.

(c) Its use by a competitor woul'd reduce his expenditure of resources 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-

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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.

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It'.'is notsthe property of. Westinghouse, b'ut must be

tr3ated as proprietary;by Westinghouse according to

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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 and improper 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 protect the 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 sell products 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.

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advantage..

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(e)l: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;capacitytoinvestcorporateassetsin research 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.

l(b)-) Westinghouse 1uses the:informatibn to verify the design of-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

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substantial harm to the competitive' position of Westinghouse (because it would enhance the ability.or: competitors to i

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

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'forLcommercial turbine-generators without commensurate-

. expenses.-lAlso,' 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

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_ documentation without' purchasing the right to use the

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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

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. invest'similar~ sums of-money and provided.he had the appro-priate talent available and could'somehow cbtain the.requi-

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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'-

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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 1 x

. 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

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' designated a; Building'-Block 281.

4 I.B;

. Number'of Hours of operation for.each LP turbine at

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

-postulatedLto insp'ection

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

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- 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 ofl verify-

.ing[the:overspee'dset' point.

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LI.D. 'For eachtdisc:

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Type.offmaterial. including material' specifica-tions y_,

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l ASTM-

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

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

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

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, JSchmerling3(part,of( Appendix' A"toTthis

Attachment:

3) used 17,254

%m 1Haro.1diRi.(pco'siletter = of February 115, 1980. (Ser. 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. fVe

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No.cl-37) to s.

q, Dento,n?used217,,276.

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'The minimum 1yieldystrength?specified for...each

'disciis givenfin(SectionLB of Appendix Afto this-A

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' Atitachmenti: 3..

gI. D.' 2.

Tensile properties data

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LTensiletproperties' data of'. tests taken-Jfrom, theidise lidbland. rim material:are 'given in-Sec-

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tion's;;BTand'C,;respectively, of' Appendix-A to this At-itachment 3.

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I.D.3.

~Totighness; properties data including Fracture

. Appearance. Transition. Temperature and upper energy and' temperature Toughness properties for.the disc hub and rim are

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

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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

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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-load 2

koperation with all moisture? separator reheaters in ser-

-vice.

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

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

Aitothis-Attachment 3)exceptforadifference.ofl'F

in;theitemperatdreilisted.for' disc 1.

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Notefthat'ithe'first120Lpagestof Appendix A consist-off

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}Westinghousej(Forfexample,7 computeriprint-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 ;

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~ 1Section6BfofcAppendixlA?tofAttachmentf3.).

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I. D~.7 P Calculated 1 keyway. crack size for turbine: tim'e 5

!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.

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' 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' rate 9

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m Thescrack growth rate 'is' givens as: G-2 in-x 3

- LAppendix A tofthis --Attachment = 3.

These1 crack growth

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crat'es1are the maximum: expected rates based upon sh^

iknown cracksito date.

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hIours JThe"IlRCdvalito Xorf the crack growth ratolis, given

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[AppendixiAJl col chis f Attachinerit..?3)i : Becausc D Wee tinghousel s 4

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_ -7 1 crack 3growthirstestover>the relevant; range are consistently-larger!'than;tho? RCl values,.Lhowever, the Ga2' numbers from s

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

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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-

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

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

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

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

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Calculated boro'and keyway: stress at operating

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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 l3.-

The values presented. include-n

?

5 the% stresses'due;tocshrink. fit and centrifugal force i

iloadsTonly.. JAdditionalvanalysisL.to-include thermal-

_a k,

stressesfandjpressureistresses are,being mado-butfare s -

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 A

A y

s t :;,

~

4

.f

.yf '~, >. '

s

, ~,.

, ~- '~'

33

~, +

L_,--

^

~

Y

?

2.

s-j '

~

dj

m s..

,r p;c,

,f.n m.:.,

n'

~

u, JN ~ ': -

a w.

y.

u

,~,

., !way)isSpartlof the': crack, Rand 7so1the:onlyisignificant c

_.i.. - ^

1s tres' 31$ tiie: b' ore. stress' ;

^ ~

s m

Yd 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 each dise"

~

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 examined isince' 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-lyet had-Lits LP, turbines inspected-by current Westinghouse tech-nique~s.= aVdpcol plans 7 o have";the1LPLrotors inspected ~during'the t

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~

l

7 n.

, n

.s

. l d

g, gl l~

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

="

.. c j.y3lN?

?ProvidestheTn.o' inalfwaterf chemistryiconditions for;each

?

IIIi:

m K M..

3 2 ELPfturbine andTdescribeJanyi: condenser:inleakages or'-other

~

.:N lsignific' ant l changes in: secondary; water chemistry to :this -

UK licrackslint:anyfgiven turbineTas related'to.historyfof pointrinlitsfoperating. 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,'" which t

~

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 chemistry t

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

+

u.

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

poked l schedule an'd' approach toLensure that turbine crack-r ing 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

' ' ~

l m-m 3

gYi. -.

-w #.n.,

s

'(

+Y,yQ:(

l

' ' -.., _ [

^ *

~.

s

_,s i_

s 3;-

,3, c

_ $f

-{

' ~ ~

p-

,. q,q q

w

7_

'l _ ;

g ^y x -

,g r

.~

m.

l - 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

'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 regarding J

{ 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-l a,

~

Land 2s.has1been done. ~ Thenbasic: anal.,.is'can be found in the 1

' 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:lAnnai 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'lsTtes 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(submittelditolthe?AppealjBoardably; March 2~

19.80.,

u s

~[ ~, gg

.i

,t g,

_, Q2

~ Y'

W l

r:n n-u, r

I

.l

,}-

g

. ~.

.E yMN fe sa m vy( *, ' <-

ap ; +

r a

2,"

op

,a u

• ' %,y )

,,4 q

s.

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h.

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4".

+,.,o (.

m 4

y

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oA