ML13162A627

Summary of R1 Containment Vents

ML13162A627
Person / Time
Site:	FitzPatrick
Issue date:	02/20/2012
From:	NRC/OIS/IRSD/RFSB
To:
References
FOIA/PA-2013-0010
Download: ML13162A627 (3)

Text

Summary of Region I BWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 Summary:

There are 8 Mark I Containments in Region I (Nine Mile Point Unit 1, Vermont Yankee, Oyster Creek, Pilgrm, FitzPatrick, Peach Botom Units 2and 3, Hope Creek) o All have a hardened torus vent installed:

o FitzPatrick is hardened up to SBGT train. The SBGT is located in a room outside of the Reactor Buill g (RB) (secondary containment).

o Mostl Outside of Scope

• re dependent on AC, DC or pneumatic power and would not be available from fr control room following a complete loss of power, except for FitzPat ck andOulside of Scope ere the valves in the RB can be operated manually.

o 50.54 (hh) containment venting requires local RB o eration of valves:

oeoEfcope jj*,

'Most except for FitzPatrick OitsideofScpe riscussed'above,'require temporary pneumatic supplies and possibly a temporary power supply.

Some like FitzPatrickI Outside of Scope use the Harened Torus Vent path.

General Insights o All the current paths are suitable for pre-core damage actions to reduce containment pressure.

This action is needed, except fol Outside of Scope jto ensure that SRVs which operate on differential pressure between the N2 system and the containment pressure, remain open.

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(b)f()

alrernate power, pneumatic suppiles, conyoi sysiems, ano position ano rad monitoring instrumentation.

Outside of Scope (of{5).

I C)47

p Jt Summary of Region I BWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 Pn I Current Hardened Vent Cont Design 50.54 (hh)

Vent Operation compared to current design Draft Containmne Vent Order Requirements.

Potential Modificatin Needed (PM) 1.1.1 1.1.2 11.3 1.2.1 1.2.2 1.2.3 1.2.4 1,2.5 1.2.6 12.7 1.2.8 1.2.9 Minimize Minimize Minimize Capacity Sustained Minimize Remote Remote Minimize Mainain Designed to Vent above Operator Operator Rad for 1% contrd inadvedent Monitor Monotor crss flow retiablity Cont normal plant Actions Hazard Hazard RTP remote or actuation system Rad to (tesng and Pressure strctures local wISBO Release another maint.

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Outside of Scope Fit Hardened to plantstac*,

Same -Hardened from

toins, PM PM PM PM PM w

PM PWA PM PM OK MaA I

except at SBGT system. Iocal RB AOV operation dependent on AC and

_L JLocaloperation possitoe Outside of Scope

Summary of Region I BWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 FitzPatrick -BWR Mark I Containment Venting 50.54 (hh)

Summary from SDP Notebook Hardened Hardened, with local operation possible:

from lorus, Torus vent is hard piped to SBGT, to-filter toi A local RB AOV however al that point the SBGT is i

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ib)rtF operation, essentially ducl work. The SBGT room is outside the secondary containm ent, any --'-

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y fier I-n B bltliiltF'~ e~asebbl~ik1~b.~b~d l~

Th(b~4}(b)(7i(Fl throu G m d rvent use. )

which b.

(4)i(b*7)

M require AC power and IA, but may be (F

J locally operated. This path then goesF throuh !he SBGT-s tern inletvalvet l (b)()41,(b!(7(F) Iwhich bI(4)...7) Y-- areAC powered,. butcan bermanually.......

operated, Local manual ac*./alion of CV (bl(4).ib)i7)(F) can still be achieved should valve AC power or air supply be lost. The soft path from the drywell can be used by plant procedures and is given some credit in the "b)(4),(b)F

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F.

n o te bo o k.......