ML19263E709

Requests Addl Info by 790716,for Review of FSAR

ML19263E709
Person / Time
Site:	South Texas
Issue date:	05/22/1979
From:	Parr O Office of Nuclear Reactor Regulation
To:	Eric Turner HOUSTON LIGHTING & POWER CO.
References
NUDOCS 7906250075
Download: ML19263E709 (5)

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NUCLEAR REGULATORY COMMISSION 3,

.E WASHINGTON, D. C. 20555

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MAY 2 21979 Docket Nos. STN 50-498 and STN 50-499 Mr. E. A. Turner Vice President Houston Lighting and Power Company P. O. Box 1700 Houston, Texas 77001

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW 0F THE SOUTH TEXAS FINAL SAFETY ANALYSIS REPORT (FSAR)

As a result of our continuing review of the South Texas FSAR, we find that we need additional information to complete our evaluation. The specific information required is in the area of accident analysis and is listed in the Enclosure.

To maintain our licensing review schedule for the South Texas FSAR, we will need responses to the enclosed request by July 16, 1979.

If you cannot meet this date, please inform us within seven days after receipt of this letter of the date you plan to submit your responses so that we may review our schedule for any necessary changes.

Please contact us if you desire any discussion or clarification of the enclosed request.

Sincerely, 94_ ts 3L Olan D. Parr, Chief Light Water Reactors Branch No. 3 Division of Project Management

Enclosure:

As Stated cc w/ enclosure:)g 9 C See next page i i I 7906250075

Mr. E. A. Turner MAY 2 21979 cc: Mr. D. G. Barker Mr. Troy C. Uebb . Manager, South Texas Project. Assistant Attornej Cereral Houston Lighting and Power Company Environmental Frotecticr. Civ. P. O. Box 1700 P. O. Box 12548 Houston, Texas 77001 Capitol Station Austin, Texas 78711 Mr. M. L. Eorchelt Central Power and Light Company Fr. R. Gordon Cooch, Esq. P. O. Box 2121 Baker & Botts Corpus Christi, Texas 78403 1701 Pennsyl vania Avenue, N.W. Washington, D. C. 20006 Mr. R. L. Hancock City of Austin Director, Governor's Budget P"- Electric Utility Department and Planning Of fice P. O. Box 1088 Executive Of fice Building Austin, Texas 78767 411 W. 13th Street Austin, Texas 78701 Mr. J. B. Poston Assistant General Manager for Operations John L. Anderson City Public Service Board Oak Ridge National Laboratory y P. O. Box 1771 Union Carbide Corporation San Antonio, Texas 78296 Bldg. 3500, P. O. Box X Oak Ridge, Tennessee 37830 Mr. Jack R. Newnan, Esq. Lowenstein, Newnan, Axelrad & Toll 1025 Connecticut Avenue, N. W. Washington, D. C. 20036 _c Mr. Melbert Schwarz, Jr., Esq. Baker & Botts One Shell Plaza Houston, Texas 77002 PA Mr. A. T. Parker D.! Westinghouse Electric Corporation Cl. 2218 203 P. O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. E. R. Sc hmi dt NUS Corporation T NUS-4 Research Place I'. Rockville, Maryland 20850 Mr. J. H. Pepin Brow 1 & Root, Inc. L. P. 0. Box 3 Houston, Texas 77001 W

J ENCLOSURE REQUEST FOR A00ITICflAL INFORMATI0ft FOR THE REVIE'-l 0F THE FSAR COR THE SOUTH TEXAS PROJECT, UrlITS 1 A'!9 2 2218 204 I s e t =4--

ns 312-1 312.21 In reference to Table 3.5-9, clarify the following: (3.5.1.3) (1) The difference between the first two lines, and also the difference between the third and fourth line for the "Contain-ment" probabilities. Similarly, the difference between the first two lines, and the difference between lines 5 and 6 (also lines 10 and 11) for the" Mechanical-Electrical Auxil-iaries Building" probabilities. _ (2) The difference between the implied P2 values ir. tne " Des-tructive" and " Design" overspeed columns. For example, by dividing out the corresponding values of P, for the first line i in the table, the P2 values of 0.003 and 0.0016 are obtained for-the " Destructive" and " Design" overspeed columns. 319. 22 Describe the protection of the spent fuel stored in the spent (3.5.1.4) fuel pool against tornado missiles impacting the fuel handling building from above. 312.23 The condensate scorage tank (CST) appears to be unprotected (3.5.1.4) against tornado missiles. Describe the procedures, if any, to be implemented for bringing the plant to a safe shutdown in the event of the coincident loss of the CST and any other safety re-lated system which is both (1) vulnerable to design basis tornado missiles and (2 ) required for safe shutdown in the event of the loss of the CST. 312. 24 In reference to Figure 9.4.1-2, sheet 3 of 4, provide an estimate -(6.4) of the return air flow rate attributable to the zones within the control room habitability envelope (i.e. the zones defined in Section 6.4.2.1 of the FSAR). In mMing the estimate, assume that the HVAC system is operating in the radiolop cal emergency ~ ~- 2218 205 4

312-2 312.24 ventilation mode. Describe briefly the basis for your estimate. (6.4) Cont'd 312.25 Since the control room habitability envelope and the rest of the (6.4) electrical auxiliary building (EAB) are interconnected via the comon air return duct, potential inleakage of airborne radio-activity into the EAB also would affect the control room area. This is not a recommended configuration (e.g. see Standard Review Plan Section 6.4, item III.1). Describe all points of entry into the EAB (i.e. windows, doors) in terms of control room operators knowing their status (i.e. open or closed) and having the ability to close them in the event of a design basis accident. 312 26 In reference to the anhydrous amonia analysis provided in (6.4) Appendix 2.2.C of the FSAR, describe the onsite transportation route which will be used in bringing the amonia to the circulat-ing water intake structure. Provide an estimate of the airborne amonia concentration in the event of a lading loss at the closest approach to the control room outside air intakes. Estimate ammonia concentrations at the outside air intakes and in the control room. 2218 206 -}}