ML19329B399

Forwards Request for Addl Info to Verify That Containment Purge Sys Isolation Valves Are Capable of Closing After LOCA

ML19329B399
Person / Time
Site:	Davis Besse
Issue date:	08/30/1976
From:	Knight J Office of Nuclear Reactor Regulation
To:	Deyoung R Office of Nuclear Reactor Regulation
References
NUDOCS 8002050607
Download: ML19329B399 (2)

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hEMORA'TDUM FOR:

R. C. DeYoung, Assistant Director for Light Water Reactors, Division of Project Managenent MOM:

J. P. Inight, Acting Assistant Director for En:;ineerin:,

Divicion of Systems Safety

SUBJECT:

CO:iTAITIE:TT VENT A :D PURGE SYSTEM 1 SOLATION VALVES Flant Nane: Davis 3 esse Unit 1 Licensing Sta.;e:. 0L, Dockae No.: 50-346' Responsible FM 3 ranch & Project Manager:

LU1-1, L. Engle Respondin.; SS Branen and Technical ? wiever: ME3, 2. Fiessel

'teview Status: Awaiting Infornation 2ecent conversations between the Mechanical Engincorint and Containment Syste.s Branches have indicated that the containment purge systen isolation valves ara identified in T2ble 6-8 of the Final Safety Analysis Report as containment isolation valves and receive auto::stic isolation si:;nals. Therefore, should a loss of coolant accident occur while the valves are open they will be called on to close while experiencing the LOCA pressure and temperature conditions within the containment. The attached request for additional infor istion solicits verification that the valves are, in fact, capable of closing follawing the LOCA event.

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MECHANICAL ENGINEERING BRANCH DIVISION OF SYSTDIS SAFETY DAVIS BESSE UNIT 1 REQUEST FOR ADDITIONAL INFORMATION i

Table 6-8 of the FSAR indicates that the containment purge system isolation valves are containment isolation valves and receive automatic isolation signals. Therefore, should a loss of coolant accident occur while these valves are open they will be called on to close while experiencing the LOCA pressure and temperature within the containment.

It is the staff's position that the containment purge isolation valves are active valves. Therefore, describe the valve operability program applicable

• to these valves. Demonstrate that this program is capable of verifying the ability of these valves to ; lose when subjected to the pressure and temperature profiles shown in Figures 6-5 and 6-6 respectively, of the FSAR. Your attention is directed to Section II.2 of Standard Review Plan 3.9.3 for a description of an acceptable operability program.

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