ML20071P013

Advises That Internal Corrosion Protection for Fuel Oil Storage Tanks in Conformance W/Ansi N195 & That Internal Coating Applied to Fuel Oil Storage Tank Not Necessary,Per SER Section 9.5.4.2

ML20071P013
Person / Time
Site:	Catawba
Issue date:	06/01/1983
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8306070314
Download: ML20071P013 (14)

Text

n DUKE POWER GOMPANY P.O. BOX 33189 CHARLOTTE, N.C. 28242 HAL H. TUCKER TELEPHONE vna ensaroswr (704) 373-4531

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June 1, 1983 Mr. Harold R. Denton, Director Office of Nuclear. Reactor Regulation U.'S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention:

Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414

Dear Mr. Denton:

Section 9.5.4.2 of the Catawba Safety Evaluation Report discusses License Condition 18, Internal Corrosion Protection for the Fuel Oil Storage Tanks.

It was'the Staff's conclusion that internal corrosion protection for the Catawba fuel oil storage tanks is not being provided.

Therefore, the Staff has proposed to condition the license to require that internal corrosion protection be applied to the fuel oil storage tanks by or during the first refueling period.

This license condition would require that the eight fuel oil storage tanks be drained, cleaned and coated.

It is Duke Power Company's position that this requirement would not enhance safety and could'be detrimental to plant safety.

The Staff has based this License Condition on Section 7.5 of ANSI N195 which states, " Protection against internal and external corrosion shall be provided."

On March 24, 1982, Washington Public Power Supply requested an interpretation of this phrase by F. A. Dougherty, Chairman ANS 59.51.

By a unanimous vote of the committee, an internal corrosion allowance was deemed to meet the require-ments of Section 7.5.

Copies of this correspondence are attached.

The Catawba fuel oil storage tanks are fabricated from 3/8 inch nominal thickness carbon steel which includes a 1/32 inch corrosioy allowance. These tanks were initially filled with fuel during March 1980.

Internal corrosion of the fuel oil storage tanks will be minimized by, 1) maintaining the tanks essentially full in accordance with the Technical Specifications, 2) removing accumulated water through a flush mounted connection on the bottom of each unit, and 3) draining, cleaning and inspecting the tanks at 10 year intervals. Any accumulated sediment in the tank is prevented from entering the supply lines to the day-tank

.by the outlet connection which is raised 6 inches above the bottom of the tank.

ItisthereforeconcludedjhattheinternalcorrosionprotectionforCatawba's fuel oil storage tanks is in conformance with ANSI N195'and that an internal coating applied to th'e fuel oil storage tank nou that'they have been filled with fuel oil for over three years (is not necessary', would be of questionable reliability, 8306070314 830601 PDR ADOCK 05000413 l

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Mr.. Harold R. Denton, Director June l',1983

-Page 2 and would pose a greater threat to the supply of fuel oil to the diesels since there is no assurance that an internal coating would not peel off in sufficiently

-large pieces that could block the outlet connection.

It is therefore requested that License Condition 18 be deleted.

Very truly yours,

' d k 4fck Hal B. Tucker ROS/php Attachment cc: ~Mr.-James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101-Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Mr. P. K. Van Doorn NRC Resident Inspector Catawba Nuclear Station Mr. Robert Guild, Esq.

' Attorney-at-Law P.O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance 2135 Devine Street Columbia, South Carolina 292G5 M. Jesse L.-

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l Carolina Environmental Study Group 854 Henley Place l

Charlotte,' North Carolina 28207 l

Mr. Henry A. Presler, Chairman Charlotte-Mecklenburg Environmental Coalition 943 Henley Place Charlotte, North Carolina 28207 l.

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AMERICAN NUCI. EAR SOCIETY

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STANDARDS COMMITTEE ft:AR 251982 WR. PMD i

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135 Nere W A.umme t.c., e-t. m ans usa T W 312/333 4 33 Taismyy 323/333 4 50 Tem 2Me5 March 22, 1982

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Mr. Frank A. Dougherty f~h= 4 rman, - ANS-59. 51 EDS Nuclear Inc..

220 Montgomery Street

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San Pravinco, Palifornia 94104 i

Dear Mr. Dougherty:

i Conf 4r=4n-your recent telephone conversation sIth Marilyn Weber I an enclosing copy of page 8 from the American Nuclear Society Scandards Conmittee Procedures Manual. This procedure is to be followed when

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preparing the interpretation request of Terry Mead from Washington Public Power on ANS-59.51.

If you have any questions or require any additional assistance, please do not besitate to contact us.

Sincerely, Mrs.

thy Picha Secretary, ANS Standards d

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4.2 development of a proposed standard would benefit fr 1

use of its criteria.

in draft form for Trial Use and Comment,It is then appropriate to issue the prop This procedure requires the approval of the responsible subcomitteefor 4.3 A proposed standard prepared for declaration as an ANS Standard

. proceeds through the following approval steps after completion of the s given in Section 2:

Ctiairman of the ANS Standards Comittee with a state s.

-of the standard.

round b.

The Steering Committee votes by letter ballot or by vote at a regularly constituted meeting on the adequacy of the development of technica approval based on the background statement.

of the Steering Committee membership shall be necessary for approval.A tw h Chairman of the Standards Comittee reports the approval of c.

the standard to the ANS President and recomends that be dec an ANS Standard.

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7he standard is then published as an ANS Standard.

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"fPreWEEtion'ofTs IhthN2aYi MoY1ESE N s3

' ' int'efpretations of'an*ANS standard shall beTonductedk following procedura:

ecording to the The request is forwarded to the Chairman of the Standards Cc=1ttee, a.

who refers it through the consensus body chairman to the appropriate subco for interpretation. '

b. '

If so, the subcommittee chairnan formulates a reply con interpretation and submits it for ballot and comment of the subcomittee attempting to reconcile comments and negative ballots, the subcomittee chairman After submits a recommendation to the Chairman of the Standards Comittee throug consensus body chairman.

of the Standards Committee and is published in #xclecr Ne:The in c.

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ANS as Secretariat of American National Standards C w itrees Chairmen of American National Standards Comittees for which AN Secretariat are ANS membere and are appointed to their respective positions for three years by the President upon recommendation of the Chaituan of the Standards Committee.

The chairmen of these American National Standards Con-tittees adMMster the committees.in accordance with the procedures of ANS and the American National Standards Institute.

M S Representation on other Standards Co ittees

. The need for ANS representation on standards cor ittees of other organi-zations is determined by the Steering Comittee.

the chairman of the Standards Comittee, with appropriate consultaticqIf such a representative.

, appoints 4

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Subject:

ANSI-N195-1976/ANS 59.51 c.

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l u-NRC Regulatory Guide 1.137 recognizes ANSI-H195-as providing

.s a method acceptable to the NRC staff for compl

• th rtinent re-quirements of General Design Criterion 17 Ap ix y:o Part 50.

i This letter requests the interpretatio fap a 1

ection 7.5 of ANSI-

'N195-1976. This phrase states:

" prot c ion gainst external and internal corrosion shall be provided". The* port estion is internal w. usion protection.

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An NRC reviewer has '

ted this phrase as an internal tank coating.

The Supply System an o.

sion allowan utilities interpret this as an internal corro-The re eme or i

ernal tank coating on a fuel oil tank is unprece-d ur i

us a letter stating the intent of the comittee who prepared dar with respect to this phrase in ANSI-N195-1976/ANS 59.51.

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P send this correspondence to:

Terry 1.. Meade WASHINGTON.PUBLIC POWER SUPPLY SYSTEM 3000 George Washington Way P. D. Box 968, MD 927M Richland, WA 99352

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Thank you for your cooperation.

e vgt-T. L'. Meade Electrical Engineer pb -

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IL Meade T f. %.J, sucnow POR APPROVAL OF APPROVED l

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Mr. Tirry L. Maade

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SUBJECT:

American Nuclear Society (ANS-59.51) f.

ANSI N195 - 1976 L.

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Dear Terry:

Enclosed is a copy of the proposed respense to your March 24, 1982 letter which I am submitting to the working group for acceptance as a formal response.

I will keep you informed of the results.

V truly yours.

F. A. Dougberty Chairman ANS 59.51

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" Protection against internal

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and external corrosion shall be provided." The basic question, b

is whether the working group intended.that a jinda be required for

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the' tanks An'the. system. To respond to this cuestion, we must

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look at our intent in establishing the requirement.

The purpose of the Standerd is defined in Section 2 and is to assure that an adequate fuel oil supply to the, diesel is maintained and that sufficient fuel exists urider all conditions. This has two componen,ts:

The fuel reserve must be large enough and"sufficiently reliable ~

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to the engine from the stored fuel.

The protection against internal and external corrosion is based on the above concerns. External corrosion to a buried tank could affect the integrity of the tank and thus place the fuel oil supply in jeopardy. Thus, the working group required protection against external corrosion.

The basis for requiring protection against the effects of. internal l,

corrosion is two fold. Firstly, there must be assurance of adequate F

system integrity for the same reasons as for protection against l

external corrosion.- Secondly, the corrosion products must not affect engine performance. This requirement is stated in Section 7.2 of the Standard. That is, the mterie.ls must be ' compatible. to the extent,that engine operation is not impaired by the materials used.

I Question

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Is the use of a corrosion allowance an adequate means of meeting the requirements of Section 7.5 of ANSI N195 - 1976/ANS 59.51 regarding internal corrosion protection?

Response

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Yes, provided that the allowance is large enough to assure integrity' of the component and conformance with applicable design criteria at the end of the plant's design life and provided that corrosion L,

products do not impair diesel engine operation.

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ATTENTICH:

Mr. T. L. Meade Electrical Engineer

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ANSI-N195-1976/ANS 59.51 a.-

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e Per today's conversation, I an enclosing five (5) ballots in ;<

response to your need for interpretation of ANSI-N195-1976. One final ballot should be arriving in a few days. Upon receipt of this ballot, I will contact you with additional information.

very truly yours, R)SAAMyRL F. A. Dougherty Chairman

• ANS 59.51 1.

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