ML20052B961

Requests Addl Info Re Hydrodynamic Loads in Control Rod Drive Sys, Such as Actuation of Inlet Line Scram Valve Using Design Basis Opening Time.Info Expected by 820801

ML20052B961
Person / Time
Site:	Fermi
Issue date:	04/07/1982
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Tauber H DETROIT EDISON CO.
References
NUDOCS 8205040199
Download: ML20052B961 (3)

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PDR APR 7g JYoungblood LPDR MRushbrook NSIC LKintner TIC Docket No.:

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Hr. Harry Tauber HThompson E

Engineering & Construction RVollmer

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ch Detroit Edison Company RHartfield, MPd f9' M'h

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Subject:

" Fast Scron" Hydrodynanic Loads on Control Rod Drive Systems

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We were recently informed by a vendor of control rod drive (CRD) systems of a potential reportable condition applicable to boiling water reactors (Enclosure). Specifically, this vendor indicates that its analysis of the hydrodynamic loads in the piping and on the supports of a particular CRD systen for a " worst case" condition resulted in structural loads which were larger than sone of the previous design loads for this system.

These larger loads result from a rapid actuation of the CRD.

The conditions assumed by this vendor for its " worst case" calculation of the hydrodynamic loads were:

(1) a design basis opening time of 20 nilliseconds for the inlet line scran valve; and (2) a scran during the start-up phase of the plant with no pressure in the reactor vessel. The vendor also stated that its modeling of the CRD systen may not be suff-iciently representative of the actual systen to accurately calculate hydrodynanic loads.

This natter has been previously discussed with the nenbers of Licensing Revieu Group II (LRG II). This group agreed to pursue this issue on their individual dockets. Accordingly, we will consider this matter to be an open item on your docket until we can resolve this issue.

Our concern in this natter is that the hydrodynanic loads in the CRD system for your facility may not have been properly evaluated. Accordingly, we request that you provide the following information for your facility.

1.

The design basis opening tine for the inlet line scran valve.

2.

An evaluation of the hydrodynanic loads in your CR0 system resulting from actuation of the inlet line scran valve using the design basis opening time specified in Iten 1.

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fir. liarry Tauber APR 71982 3.

A description of the conditions and configurations of the plant which result in the maximum hydrodynanic loads in the CRD systen.

4.

A statenent regarding the appropriateness of the mathematical nodel used to calculate the hydrodynamic loads in the CRD systen resulting from a scran.

5.

A comparison of the 11ydrodynanic loads evaluated in Iten 2 with the present design basis loads for the CRD system.

In the event that the ttydrodynanic loads calculated for your facility exceed the present design basis structural loads for the CRD systen, indicate which components are affected and subnf t a proposed plan for structurally reinforcing the affected components.

Please amend your-application to provide the above requested information. Our review schedule is based on the assumption that the additional information will he available for our review by August 1,1982.

If you wish clarification of the requests or if you cannot neet these dates, please telephone the Licensing Project Manager, L. Kintner, within 7 days after receipt of this letter.

Sincerely, origins 1 Signed W 3, J Youngblood.,

B. J. Youngblood, Chief Licensing Branch 110. 1 Division of Licensing

Enclosure:

As stated cc w/encls.: See next page Afl

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l Mr. Harry Tauber j

Vice President l

Engineering & Constru'ction k

Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 j

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Mr. Harry H. Voigt, Esq.

LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N. W.

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Peter A. Marquardt, Esq.

Co-Counsel

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The Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 M.r. William J. Fahrner Pr~oject Manager - Fermi 2 The Detroit Edison Company 2000 Second' Avenue Detroit, Michigan 48226 Mr. Larry E. Schuerman Detroit Edison Company 3331 West. Big Beaver Road Troy, Michigan 48084 David E. Howell, Esq.

3239 Woodward Avenue Berkley, Michigan 48072

. Mr. Bruce Little 1-U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 W. '4xie Highway Newport, Michigan 48166 Dr. Wayne Jens Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226-Mr. James G. Keppler Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 e

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Reictor Codr'oli[Inc.

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Subject:

A Potential. Reportable Condition

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.. ' 2.:. Gentlemen:I...:.. '. '

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The purpose of this letter:is'to bring to' the attention. of your-off.i.ce and the other organizations listed on an attachment: to'this letter, a condition that Reactor Controls believes may present a Potential Reportable Condition affect'in

.' safdty of, th'e ControT. Rod Drive,.Eydraulic_.53.st.em in the Bo_il;i.p plants for which Reactor-Controis-supplied portions of.the system..The ' item c

that causes our' concern is as follows.

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- While performing the stress analysis of the piping and supports of the system

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for a BjiR_-6_ unit, we were required to consider loads To d? so.l

RCI requested the opening time of the Inlet Lin, hydro dynamic e Scram ViTve.. The reply stated.

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.the.~ time to be twenk'iiilles.e.co6ds. Using this opening time..the resultant'd.$p M'/;s..' hydro dynamic load re quired modif'ications to the design oflhe yipgupp6fts'.f.-.

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. - This was.on the basis 'of using ~the worst' case,'iT~duriligTst_ar.

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,7;,. there is no pressure in~ the reactor vessel, resulting. n a greater C

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At that time we thought that the " Fast Scram" fen.tur.e_of the 3NR-6_y.aL.introduc '.'

But upon further, inquiry we have been' ig a new inad condition _on.:.the_sy.s_t.em. informed by General Electric C earlier ' units of the Boiling Water Reactor also.

pi ing and supports for many Reactor Contr.ols._has.. fabricated and installed the_ho,p:e'fuT6crtW::wiQqut consi Co trol Rod _Dr.ive Hydrau1Tc]ys_tenis Tn8d616i{d_.t s

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_ ing_Sydro_Dynam1EToads due to the scram function.

Our concern _i_s_;_that..this.' additional load may_r.epresent a.. pot.ent_ial_safey_consid-o eration for those. plants whose design did not include it.

Consequently we feel' UIIF obligaHon"is toTnfEdif yotIF'offi'c'e7By" copy"of -Wis letter we are also in-feming those utilities constructing or operating plants for which Reactor Con-trols has provided portions of the Control Rod Drive Hydraulic System.

. However we are'also aware of, and'wish to point..out, that the Control Rod Drive Hydraulic System.has many years of successful operation at all plants without s ;w.;

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using computer programs that may not parallel the s But we are taking the opportunity by this letter to

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f the facts as we presently understand them.

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Mississippi Power & Light Company Si.c;.e & Webster Engineering Corporation Post Office Box 756 3 Executive Campus Port Gibson; Mississippi 39150 Post Office Box 5200 Attn:

Mr. George. Rogers Cherry Hill, New Jersey 08034

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BechteT Power Corporation-Send Letter toi

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Mr. Adrian Zaccaria, Residerit Manager.

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Supt. of Nuclear. Generation Plymouth', Massachusetts: 02360...... : - c.

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Post.0ffice Box 604 Riv'er Bend North Country Road Stone & Webster Engineering Corporation Wading River, New York 11792 3 Executive Campus Attn:

Mr. W.J. Museler Post Office Box 5200 Cherry Hill, New Jersey 08034 Attn:

Mr. C.G. White Comonwealth Edison Company Contract Administrator Post Office Box.767 Chicago, Illinois ~ 60590 Attn:

Mr. B.R. Shelton G'ulf States Utilities Company Post Office Box 2951 Beaumont, Texas 77704 Attn:

Mr.'W.J. Cahill Sr. Vi'ce President-RBNG

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BASCO Services, Inc-Georgia Power Company One.Jericho Plaza E.I. Hatch fluclear Plant Jericho, New York 11753 Post Office Box 442 Attn:

Mr. N.P. Singh Baxley, Georgia ' 31513 Pr'oject Mana.ger

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Raleigh, thrth Carolina 27602 Attn: Mr. S.R. -Zirmierman

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