ML20117N857

Forwards Sheets of Backup to Be Reviewed Before Thursday Phone Call

ML20117N857
Person / Time
Site:	05200003
Issue date:	05/08/1996
From:	Winters J WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Kenyon T NRC
Shared Package
ML20117N226	List: ML20117N840 ML20117N848 ML20117N854 ML20117N857 ML20117N877 ML20117N882
References
NUDOCS 9606250034
Download: ML20117N857 (3)

Text

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a ggg\bbb 5 Question: DSER-OI 10.4.9-2 STAR'IUP FEEDWATER SYSTEM. FWS, WATER HAMMER) Westinghouse should address the issue of plant damage due to water hammer during startup.

Response: DSER4I 10.4.9 2 in addition to information contained in SSAR, section 10.4, Revision 6, Appendix 3B, Revision 7, 2 addresses the potential for water hammer in feedwater lines. The " Main Feedwater Line" portion o l, SSAR subsection 3B.2.3 addresses a number of design features included in the amin and stanup feedwater system, piping, components and control that minimize the potential for water hammer. The potential for water harrmer during startup is minimized by having a startup feedwater system sep from the main feedwater system. This startup system can not add cold water to the hot main  !

feedwater system, is sized appropriately for startup, has control valves and other features design '

1 startup service, is routed to minimize geometric sources of water hammer, and feeds a steam generati nozzle and feed spray system separate from the main feed ring. 'Ihis item is closed.  !

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e96 200'390d 33u of 1833 N91530 009de WOdd 00:21 96. 8 N

NRC REOUEST FOR ADDITIONAL INFORMATION

1. .-' nm :

Question 410.293 Section 10.4.9.1.1 of the SSAR (Revision 4) states, in part, that the stanup feedwater control valves (SFCVs) and startup feedwater isolation valves (SFIVs) are designed to close on an appropriate enginected safety signal (startup feedwater isolation signal) and the SFIV also serves as a containment isolation valve. Before the design change Section 10.4.7.1.1 of the SSAR stated that the SFIV serves as a containment isolation valve and closes containment isolation signal. Explain why the SFIV should not close on a containment isolation signal. Containment isolation provisions require auxiliary feedwater isolation valves to have remote manually close feature whenever containment isolation is required.

Response

SSAR subsections 10.4.7.1.1 and 10.4.9.1.1 Revision 7, include a more consistent description of safety related functions of the main and stanup feedwater control and isolation valves. Subsection 10.4.7.1.1 discusses only main feedwater system functions and components. Subsection 10.4.9.1.1 discusses only startup feedwater functions and components Bullet sections of subsection 10.4.9.l.1 are intended to reenforce the fim paragraph of the subsection.

Startup feedwater isolation valves close on any of containment isolation, steam generator isolation or feedwater isolation signals. They can also be closed by a remote manual signal.

SSAR Revision: NONE

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NRC REQUEST FOR ADDmONAL INFORMATION

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Question 410.294 Section 10.4.9 of the SSAR (Revision 4) does not address water hammer problem in the startup feedwater s Westinghouse nMM a paragraph in Section 5.4.2.2 of the SSAR (Revision 4) to address the design ch a separate startup feedwater delivery system connected to the steam generator. However, the informanon provided in the section regarding water hammer occurrence in the startup feedwater piping is not adequate. Section 5.4 states, in part, that prevention and mitigation of feedline-related water hammer has been accomplished throug improved design and the layout of the startup feedwater piping includes the same features as the main feedwater li j

to minimize the potential for water hammer. Provide information on the improved design and design features for water hammer prevention for the startup feedwater system.-

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Response

The Main Feedwater Line portion of SSAR Appendix 3B, subsection 3D.2.3, Revision 7, provides a more detail discussion of the AP600 design features for minimizing water hammer, including piping layout feamres As indicated in SSAR subsection 5.4.2.2. the starup feedwater piping layout includes the same features as the ma feedwater piping layout. As indicated thoughout SSAR subsection 10.4.9. the startup feedwater system is operated and has water sources consistent with minimizing the potential for water hammer SSAR Revision: NONE 98 g_ . . - -,_,uose

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