ML082740489

Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors.

ML082740489
Person / Time
Site:	Calvert Cliffs
Issue date:	09/30/2008
From:	Spina J A Calvert Cliffs, Constellation Energy Group, Nuclear Generation Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML082740493	List: ML082740489 ML082740495 ML082740497
References
GL-04-002, TAC MC4672, TAC MC4673
Download: ML082740489 (3)

Text

James A.Spina V ice Pre sident 0:/**>stella Ion Energy../NuclearGeratinGrou p U.S.NuclearRegulatoryCom mission Washington,DC20555 Calvert CliffsNu clear P ower Plant , Inc.1650 Calvert Cliff s Parkway Lu sby , Maryland 20657 410.495.5 200 410.495-3500 Fax September30,2008 ATTENTION:

REFERENCES:

DocumentControlDesk Calvert Cliffs Nuclear Power PlantUnitNos.I&2;DocketNos

.50-317&50-318 Supplemental Response to GenericLetter2004

-02,"Potential Impact of DebrisBlockageon Emergency RecirculationduringDesignBasis Accidents atPressurizedWaterReactors

"(a)LetterfromMr.J.A

.Spina (CCNPP)to DocumentControlDesk(NRC),datedJune18,2008,Requestfor Extension for Completion of ActivitiesRelatedto GenericLetter2004

-02(b)LetterfromMr

.D.V.Pickett(NRC)toMr.J.A.Spina (CCNPP), datedJune30,2008, Extension for Completion of ActivitiesRelatedto GenericLetter2004

-02(TACNos.MC4672andMC4673)(c)LetterfromMr.J.A.Spina (CCNPP)toDocumentControlDesk(NRC),datedFebruary29,2008, SupplementalResponseto GenericLetter2004-02,"Potential Impact ofDebrisBlockageon Emergency RecirculationduringDesignBasis AccidentsatPre ssurized Water Reactors" In Reference (a), Calvert Cliffs Nuclear Power Plant (CCNPP)submittedarequestforan extension to completeourresponsetotheNuclear Regulatory Commission (NRC)GenericLetter(GL)2004

-02,"Potential Impact ofDebrisBlockageon Emergency RecirculationduringDesignBasis Accidents at PressurizedWaterReactors

."TheNRCgrantedour extensionrequestinReference(b)

.In reference (a), Calvert Cliffs committedtoprovidearevisiontothe supplementalresponseweprovidedin Reference (c).Thisletterprovidesthatrevisionas Attachments(1)and(2).AsnotedinReferences(a)and(b)(and Attachment 1), additional testing is scheduledtobe performed intheFall of2008basedonupdateddebrisandchemi cal loads.Includedinthose chemicalloadswillbe appropriate surrogates tha treflectour requested containment buffermaterialchangefrom trisodium phosphat etosodium tetrabora te.Thistestseriesalsohasthepotentialtochangetheresults of some of the evaluations provided i n Attachment (1).The currentnetpositivesuctionhead evaluations (in Attachment1)arebasedontesting performedintheSpring of2008with chemical surrogates for trisodium phosphate.Asnotedin Attachment(1),theresults ofthisnetpositive suction head evaluation continue to shownegativemarginforthe containmentspraypumps,andanincreasedneedto throttle flow Document Control Desk September 3 0,2008 Page 2toprov ide positive margin fo r the highp ressure safety injectionpum ps.Weconti nuetorefine t hese evaluatio ns as moredataare reviewedandmorei nformation comes to light.A fter completion o f the testing in th e Fallo f 2008 ,wewill provide a revi sedsupplemental respo nsetotheNRC reflecting th eresultso f the testingandan y c hanges i n net positive suction head evalua tions.Shouldyouhave questions r egardingthismatter, please con tact Mr.JayS.Gaines at (410)495-5219.STATE OF MARYLAND T O WIT: COUNTY O F CALVERT I , JamesA.Spina, being dulysworn,statethatIamVice President-CalvertCli ffsNuclear Powe r Plant, Inc.(C C NPP), andthat I a m d u ly authorized t o execute and fileth is response on behalf ofCCNPP.T othebest of m y knowledgeand belief, the stateme nts conta ined i n th is documentaret rue an d correct.T otheextentthatthesestatements are not basedonmype rsona l knowledge, they are based upon information provided b y other CC NPP employees a n d/or consultants.Suc h informationhasbeenreviewedin accordance with companypra c ticeand I believe ittobereliable.Subscribe d and sworn beforeme,a Notary Public i n and fortheS tate o f MarylandandCounty o f t?!J.d/CUj Q , thi sdayo f (2rlernW , 2008.Oat;1M J,../.02011 WITNESS my H and and Not a rialSeal: My CommissionExpires: JAS/PSF/bjd Attachments:(1)

(2)Supple menta l Response to GenericLetter 2004-02 ECCS andCSSyste m Figures Document Contro l Desk September 30, 2008Page3cc:D.V.Pickett , NRC S.J.Collins , NRC Resident Inspector , NRC S.Gray, DNR