ML20235C618

Advises That Containment Design Pressure May Not Be Reduced as Proposed in & Design Pressure Should Remain at 62 Psig Value.Conclusion Based on Need to Retain Sufficient Margins.Max Drywell Liner Temp Reevaluation Requested

ML20235C618
Person / Time
Site:	Brunswick, 05000000
Issue date:	08/25/1970
From:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
To:	Colby P CAROLINA POWER & LIGHT CO.
Shared Package
ML20235B311	List: IA-87-111, Submits Rept on Plant,As Discussed in ACRS 150th Meeting on 721012-14.Listed Items Can Be Resolved During Const & Facility Can Be Constructed W/Reasonable Assurance for Operation W/O Undue Risk to Public Safety IR 05000254/1972009 IR 05000358/1972003 IR 05000358/1973001 IR 05000358/1973002 IR 05000358/1973003 IR 05000358/1973005 IR 05000358/1973006 IR 05000358/1973007 IR 05000358/1974001 IR 05000358/1974002 IR 05000358/1974003 IR 05000358/1975004 ML20235B308 ML20235B364 ML20235B401 ML20235B405 ML20235B424 ML20235B456 ML20235B461 ML20235B465 ML20235B477 ML20235B488 ML20235B507 ML20235B552 ML20235B582 ML20235B585 ML20235B588 ML20235B605 ML20235B618 ML20235B623 ML20235B649 ML20235B656 ML20235B662 ML20235B670 ML20235B679 ML20235B683 ML20235B687 ML20235B702 ML20235B708 ML20235B713 ML20235B714 ML20235B718 ML20235B720 ML20235B730 ML20235B734 ML20235B748 ML20235B754 ML20235B762 ML20235B764 ... further results
References
FOIA-87-111 NUDOCS 8709240509
Download: ML20235C618 (2)

Text

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Mr. P. S. Colby 2sxt***"st Newmark & Hall (2)-

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carolina rower & Light Company 1sxasxwattayxasta l 336 Fayetteville Street Raleigh, North Carolina 27602

Dear Mr. Colby:

We have completed our review of your proposed reduction of the design pressure from 62 pois to 53 psig for the drywell and torus. of the Brunswick containments, which you filed with your letter of March 9, 1970. We have carefully considered the additional inforination con-tained in the proprietary G. E. report, " Additional Information -

Pressure Suppression Concept - Test Data Report," NEDE-10182, May, 1970 and in your July 30, 1970 response to our letter of May 28, 1970.

It is our conclusion that the Brunswick contairement design pressure may not be reduced as you have proposed and that the design g ressure should remain at the previously accepted value of 62 psig. 'this conclusion is based on a need to retain sufficient margins to cover (1) the limited experience and experimental data available for defining accident phenomena and containment response and (2) uncertainties in the vent flow model and in the degree of accuracy to which the Bodega and Humboldt test data may be extrapolated to the Brunswick design.

Moreover,.we request that you reevaluate the maximum drywell liner temperature that could result. from a primary system blowdown from intermediate ,

operating pressures. We request that you file the results of this evaluation  !

, along with the other information you agreed to furnish prior to construction. ]

Sincerely, triginal signed by i Peter A. Morria q Peter A. Morris, Pi* c .tr Division of Reactoi Lic:.4 sing l l

cc: G. F. Trowbridge, Ecq. (See attached. Rewritten per GArlotto, EGCase)

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RDeYoung DSkovholt PCollins WRButler Mr. F. S. Colby SMKari Senior Vice President bec: H. J. McAlduff, ORO i Operating & Engineering Group E. E. Hall, GMR/H j Carolina Power & Light Company J. A. Harris, PI l 336 Fayetteville Street R. Leith, OC d Raleigh, North Carolina 27602 J. R. Buchanan, ORNL j T. W Laughlin, DTIE

Dear Mr. Carlby:

A.*A. Wells, ASLB 1

We have completed.our review of your proposed reduction of the design f pressure from 62 pois to 53 pais for the drywell and torus of the Brunswick contaimeents, which you filed with your letter of March 9, 1970. We have carefully considered the additional information con-tained in the proprietary G. E. report, " Additional Information -

rressure suppression Concept - Test Data Report," NEDE-10182, nay, 1970 and in your July 30, 1970 response to our letter of May 28, 1970. 7 1

It is our conclusion that the . w..ick contair==nne design pressure may not be reduced as you have proposed and that the design pressure should remain at the previously accepted value of 62 pois. This conclusion is based on a need to retain sufficient margins to cover existing uncertainties in the went flow model and in the degree of accuracy to which the Bodega and Bueboldt test data may be extrapolated to the Brunswick design.

Moreover, we request that you reevaluate the ==w4-= drywell liner j temperature that could result from a primary system blowdown,from j intermediate operating pressures. We request that you file the results  !

of this evaluation along with the other information you agreed to furnish pr: Lor to construction.

f Sincerely,

Feter A. Norris, Director

! Division of Reactor Licensing {

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