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 IBWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 Summary:

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

o FitzPatrick ishardened up to SBGT train. The SBGT islocated inaroom outside of the Reactor Buill g(RB) (secondary containment).

o Mostl Outside ofScope *re dependent on AC, DC or pneumatic power and would not be available from fr control room following acomplete loss of power, except for FitzPat ck andOulside ofScope ere the valves inthe RB can be operated manually.

o 50.54 (hh) containment venting requires local RB oeration of valves: oeoEfcope jj*,

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

Some like FitzPatrickI Outside ofScope 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 isneeded, except fol Outside ofScope jto ensure that SRVs which operate on differential pressure between the N2 system and the containment pressure, remain open.

(b)f()

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

Outside (of{5).

ofScope I

C)47

p Jt Summary of Region IBWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 Pn ICurrent Hardened Vent 50.54 Vent (hh) Draft Vent Containmne OrderRequirements.

Potential Modificatin Needed (PM)

Cont Design tocurrent1.1.1 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 compared Operation 1.2.8 1.2.9 design Minimize Minimize Minimize Capacity Sustained Minimize Remote RemoteMinimize MainainDesigned to Vent above Operator Operator Rad for1% contrd MonitorMonotorcrss flowretiablity inadvedent Cont normal plant Actions HazardHazardRTP remote or actuation system Rad to (tesng and Pressure strctures local wISBO Release another maint.

I ] I I I I ~W/

Rf I 11irt III ]

Outside ofScope Fit Hardened toplantstac*, Same -Hardened from toins, PM PM PM PM PM w PM PWA PM PM OK MaA I exceptat SBGT system. Iocal RBAOV operation dependent onAC and JLocaloperationpossitoe _L Outside ofScope

Summary of Region IBWR Containment Vents Prepared by the Senior Reactor Analysts February 2012 FitzPatrick -BWR Mark IContainment Venting 50.54 (hh) Summary from SDP Notebook Hardened Hardened, with local operation possible:

from lorus, Torus vent ishard piped to SBGT, toiA to-filter local RB AOV however al that point the SBGT is ) i ib)rtFo operation, essentially ducl work. The SBGT room is outside the secondary containm ent, any --'-

....o. y  :.. . .-- fierI-nB bltliiltF'~ e~asebbl~ik1~b.~b~d l~ ... Th(b~4}(b)(7i(Fl throu G md 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 orair supply belost. The soft path from the drywell can be used by plant procedures and isgiven some credit inthe "b)(4),(b)F b., . notebook. . . .. . . F.