ML20003G178

Confirms Telcon Re Addl Info Requested Addressing Technical Issues on Hydrogen Control Considered During Public Hearing. Util Views on Likelihood for Inerting of Lower Compartment W/Steam &/Or Fog Should Be Addressed

ML20003G178
Person / Time
Site:	Sequoyah
Issue date:	04/14/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Parris H TENNESSEE VALLEY AUTHORITY
References
NUDOCS 8104280431
Download: ML20003G178 (3)

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m Docket No 50-328 APR 141981 E9} Es %APR 21 Jggg G2 Mr. H. G. Parris~

Itanager of Power

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Tennessee Valley Authority

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Chattanooga, Tennessee 37401 4

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SUBJECT:

REQUEST FOR ADDITIONAL INF0FF.ATION ON SEOUOYAH UNIT NO. 2 This will confinn recent telephone conversations between TVA and members of the HRC staff.

With regard to the upcoming full power licensinq of Sequoyab, Unit 2, the HRC staff requested additional infomation fron TVA that addresses certain technical issues on hydrogen control considered in the course of the recent public hearing on the McGuire Nuclear Plant.

As a mininum, we will expect your subnittal to address:

1) TVA views on the likelihood for inerting of the lower compartment with steam and/or fog;

2) Whether continuous burning of hydrogen gas can be expected in the upper plenum of the ice condenser for a significant fraction of degraded core scenarios or for significant durations of selected degraded core scren-e erios; l

3) The Sandia National Laboratory views regarding the potential for " transition 1

to.ietonation" in the upper plenum of the ice condenser that may be brought about by obstructions in the flow path or by jetting effects as hot gases l

or combustible products leave the ice condenser and enter the upper compart-ment;

4) The inventory, distribution, and protective encapsulation for the poly-urethene foam insulation;

5) The thermel response of polyurethene foam to various assurptions as to, semi-steady flame positions in the ice condenser; i

6) The effects of continuous burning of the wall panel duct including the 4

temperature increase and subsequent decrease in structural capability which if severe enough could result in rupture of the ducting.

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Mr. H. G. P:rris 7.

The pyrolysis and cor.bustion potential for the foam insulation resulting from the therral responses called for in Item 5; 8.

The consequences on containment structual intecrity as a result of a release end possible combustion of the &co position products fre-the poly-urethene foan;

. The writ cf the tripping of electrical power to the air handline units located in the upper plerur cf th: ice condenser as a r.eans for resolving concerns regarding:

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rapid hydrogen cor.bustion in the duct work; b.

ingestion of hot gases into the duct increasing the temperature response of the polyurethane foan.

A response is needed by April. 17, 1981 in order to be consistent with the schedule.

Sincerely, or w nsd g aa by W I. Tateem Robert L. Tedesco, Assistant Director for Licensing Division of Licensing DISTRIBUTION:

Docket File NRC PDR l

Local PDR LB#2 File DEisenhut RTedesco ASchwencer CStable MService IE (3) bcc: ACRS (16)

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j Mr. H. G. Parris l'.an6ger of Power Tennessee Valley Authority i

500A Chestnut Street Tower II Chattanooga, Tennessee 37401 cc: Herbert S. Sanger, Jr., Esq.

General Counsel Tennessee Valley Authority 400 Comerce Avenue E 11B 33 Knoxville, Tennessee 37902 Mr. H. N. Culver Tennessee Valley Authority 400 Comerce Avenue, 249A HBB Knoxville, Tennessee 37902 Mr. Bob Faas Westinghouse Electric' Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Mark Burzynski i

Tennessee Valley Authority 400 Chestnut Street Tower II Chattanooga, Tennessee 37401 Mr. J. F. Cox 3

Tennessee Valley Authority 4

4 400 Comerce Avenue W10C131C I

Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NPS c/o U.S. Nuclear Regulatory Comission 2600 Igou Ferry Road

' Soddy Daisy, Tennessee 37379 E -

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