ML17174A395

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Requests Evaluation of Reactor Turbine Bldg Parameters to Verify Originally Reported Values & Those Recently Changed to Assure Validity of Data Used in Seismic Review Rept. Requests Updated Status Rept Re Open Issues from Review
ML17174A395
Person / Time
Site: Dresden Constellation icon.png
Issue date: 01/09/1980
From: Ziemann D
Office of Nuclear Reactor Regulation
To: Peoples D
COMMONWEALTH EDISON CO.
References
NUDOCS 8001310135
Download: ML17174A395 (5)
v • d • e


Text

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Docket Nd.: 50~237 Mr. D. Louis Peoples Di rector, Nu cl ear L 1.cens i ng Commonwealth Edison Company Post Office Bo~*767 * *

Chicagb, Illino~s-60690

Dear Mr. P~oples:

JANUARY 0 ~. 1980 As your are aware.** the* Senior Seismic.Revfew :Team (SSRT). report* on *the *seismiC.

review of Dresden 2 h~s been essentially. ~ompleted:..~ncl uded* in that* report *

.are the results of certain calculations made to confirm the seismfc resistance of the-plant. *Additional time and effort was necessitated to '"evaluate the.

-'impact of revised builqing parameters which were reported 'by.your_tonsultant,

'Joh"n -A.* Blume* Associates.

Our, computations "reflecting the revised properties'.

. showed changes 1 n the forces and stresses in. the re_actor-turbi ne building.ana\\

- in the floor response* spectra for equipment. ;.Th.e:evaluation provfd1ng~our,..

  • rea~sessme_n*t that.t*akes:into-_aq:ount these changes* will be comple~ed so.on~, 1)**:
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The SSRT computations are* 1ntendea*to provide.estimates.for c~eck.ing -the. se:is~11c

. resistance capability of O'resden 2 *. It is not practical for the NRC or-' the;*;,

    • SSRT to cneck and/or recompute.*a11 *bu~1d1ng_ parame.ters such as moments'of (:/' '

" inertia and shear.areas.

Therefor~,-.the SSRT evaluations generally assurn~d* < t.

tha~ the values* originally *coiTiputed by the Blume organization were -correc~.:. i \\

The _focrease of the lower story *turbine building design parameters by*s*everal~

"orders otmagnftude over the correspon~ing values provided:and use.d,in-OU\\~ \\

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  • analyses lead us. to *request qmfirmation of other parameters throughout. the fl..

- _. reac,tor.-~urbine building comp.lex.

Therefore, we request that you undertake('\\ *

,.*.an evaluation of the reactor-turbi.ne bujlding design parameters to verify:-' \\l **:

both the or1 gi na l ly reported va 1 ues and* those recently char,iges *to* a~su r.~-.: -. * *. \\. _. -.

the val_1dity.of ~he.data* used in the ~SRTevaluat1on. This evaluat1_on sho_~ldl'<

be *based ~p~n as-b~1l~ g~ornetry_ if ~tns information: 1s ~~~~lable. ;:.._",, *. :*l.. _

On October 11, 1979, tt1e JJRC staff and NRC consu*l tants met with your represen-il

  • tatives to d1_scuss var1ous open issues associated with the mechanical and i ",) 'l. *."

._electrical evaluations \\;1h'ich \\'lere developed as a result of the SSRT*r~view. '.. :**\\

These issues are* documented Jn Enclosure 3 of the ineeting summary" dated

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November 1, 1979.

Sub~equent discussion_ between *our staffs ind.icat~ *th:at * *

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. you have initiated steps ~o address these issues.

We request that-you

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provide for our review an updated status report*al_ong with a detailed

  • action plan for resolving the rem1an1ng open issues including the.

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RC FORM 318 (9*76) NRCM 0240

  • U. B. GOVERNMENT PRINTING OFFICEI 1978-626*624

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0 Mr. o.* **Loy~s Peoples JANUARY J J 1980

  • *Scope and. s.chedule for-eQiJlpleU<>r'h Please s~bmit this. foformatiori witb'in *

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  • 30 days fncludfog y,our p.lan and schedule for v~rifict1t1on.of bu11dtng design*

par~ri:iete_rs..

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket No.: 50-237 Mr. D. Louis Peoples Director, Nuclear Licensing Commonwealth Edison Company Post Office Box 767

Dear Mr. Peoples:

January 9, 1980 As your are aware, the Senior Seismic Review Team (SSRT) report on the seismic review of Dresden 2 has been essentially completed.

Included in that report are the results of certain calculations made to confinn the seismic resistance of the plant. Additional time and effort was necessitated to evaluate the impact of revised building parameters which were reported by your consultant, John A. Blume Associates. Our computations reflecting the revised properties showed changes in the forces and stresses in the reactor-turbine building and in the floor response spectra for equipment.

The evaluation providing our reassessment that takes into account these changes will be completed soon.

The SSRT computations are intended to provide estimates for checking the seismic resistance capability of Dresden 2. It is not practical for the NRC or the SSRT to check and/or recompute all building parameters such as moments of inertia and shear areas. Therefore, the SSRT evaluations generally assumed that the values originally computed by the Blume organization were correct.

The increase of the lower story turbine building design parameters by several orde.rs of magnitude over the corresponding values provided and used in our analyses lead us to request confinnation of other parameters throughout the reactor-turbine building complex.

Therefore, we request that you undertake an evaluation of the reactor-turbine building design parameters to verify both the originally reported values and those recently changecl to assure the validity of the data used in the SSRT evaluation. This evaluation should be based upon as-built geometry if this information is available.

On October 11, 1979, the NRC staff and NRC consultants met with your represen-tatives to discuss various open issues associated with the mechanical and electrical evaluations which were developed as a result of the SSRT review.

These issues are documented in Enclosure 3 of the meeting summary dated November 1, 1979.

Subsequent discussion between our staffs indicate that you have initiated steps to address these issues.

We request that you provide for our review an updated status report along with a detailed action plan for resolving the remaining open issues including the

Mr. D. Louis Peoples January 9, 1980 scope and schedule for completion. Please submit this information within 30 days including your plan and schedule for verification of building design parameters.

cc:

See next page Sincerely, 0*

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/I Dennis L.

Ziemann.:~1 Chief Operating Reactors Branch #2 Division of Operating Reactors

~r. D. Louis Peoples cc:

Isham, Lincoln & Beale Counselors at Law Cne First National Plaza, 42nd Floor Chicago, Illinois 60603

~r. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rural Route #1

~orris, Illinois 60450 Anthony Z. Reisman

~atural Resources Defense Council 917 15th Street, N. W.

~ashington, D. C.

20005 U. S. Nuclear Regulatory Commission

~TTN: Jimmy L. Barker P. 0. Box 706

~orris, Il 1 inois 60450 Susan N. Sekuler

~ssistant Attorney General Environmental Control Division 188 W. Randolph Street Suite 2315 Chicago, Illinois 60601

~orris Public Library E04 Liberty Street

~orris, Illinois 60451 Chairman Board of Supervisors of Grundy County Grundy County Courthouse

~orris, Illinois 60450 January 9, 1980 Department of Public Health ATTN:

Chief, Division of Nuclear Safety 535 West Jefferson Springfield, Illinois 62761 Director, Technical Assessment Division Office of Radiation Programs (AW-459)

U. S. Environmental Protection Agency Crystal Mal 1 #2 Arlington, Virginia 20460 U. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:

EIS COORDINATOR

~30 Sout~ Dearborn Street Chicago, Illinois 60604

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