ML20062K201
| ML20062K201 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/20/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Ross D, Schroeder F, Vollmer R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012020701 | |
| Download: ML20062K201 (12) | |
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Docket Fil D. Eisenhut C. Stahle R. Purple M. Service Local POR R. Tedesco I&E (3)
NRR Reading A. Schwencer LB #2 File
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D. F. Pess, Jr., Cirecter Divisicn of Systers Integraticn NOV 2 01980 q
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Division of Tafety Tcchnology 3
R. H. 'scilrer, Director b.
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SECUCY;h PYCRCCEN CONTROL PRCGRAM ruring the initial review of the hydrcgen tratter en Secucyah, the Divisien cf Ssterrs Inte<ratien tech the overall lead in the review.
Subsequently, it beccre apparent that the cther civisiens in NRR shculd $cccrr.c integral parts of this review. The staff is mandatec by Ccenissien directive to crevide its bases for adecuacy of the hydrogen control system by January 31, 1901 (see cac Chilk to Circhs dated Septe:rber 2a,1900).
/reas of respensibility for the varicus UPR branches in the conduct of the Secucyah hydrogen control program were initially cutlined in an L. Ruhenstein tc n. Poss, D-DSI metrorandum of Cctober 9,1960. To assure that no misunder-standings arise which cculd adversely affect cur licensing efforts, additienal reinforcerent and extension cf this discussicn of responsibility is needed.
Baseri upon the Cerrsission's acticn dates, our efforts should be channelled in the direction of shcrt and icng term programs with completion dates of January 31, 1981 and January 31, 1982, respectively. Short term acticn involves reasonable assurance for interim hydrogen control system whereas the icng term action is for the final fix. All requests for information and meetings should be ccordinated thrcugh the PM, Carl Stable (extensicn 28474).
It also may be necessary to ecdify this plan as the review progresses to 'accocodate changes and requirements as they developed.
The short term schedule that we will follow recuires SER inputs to PM by December 5,1960 for an ACRS reeting in January 1981. An SER will be published no later than December 15, 1980. These dates are firm, consequently, any slippage wculd jeopardize eur meeting the Sequoyah license condition.
/ccordingly, I prorcse the following revision to proposed " work elements fer cach branch:" as cutilned in the Ross.Memorancum, THIS DOCUMENT CONTAINS P00R QUALITY PAGES R
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NRC FORM 318 (9 7G) NRCM 0240 DU.S. GOVERNMENT PR,NTING OFFICE: 1979 *89 369
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Containment Systems Branch, DSI TFe CSE continues to retain primary resrensibility for assuring that the everall requirements and ?!PR needs of the Secucyah M2 control program for the above January 31, 1981 date and the subsequent and January 19E2 dated of License cenditions 2.D.(2) are defined. CSB is responsible for the technical cecrdination of the efforts cf other branches, as' identified belcw. Sccping and scheduling disagreements should they cccur vill be raised to the appropriate supervisory /ranagement level for irm:ediate resolution. Additionally, CSB will be responsible for evaluating the efficacy of the Interim Distribution Ignition System (IDIS).
It will also evaluate related testing prcgrams and the effectiveness and recuirements for the hydrogen menitoring system, the alternative mitigating systems shculd the IDIS prcve unacceptable. Additionally, CSB shall te rescensible for specifying the consecuences of hydrcgen generated scurces and rates, which are RSS responsibilities.
Input as to the bydrogen sources frem corrosien of coatings and ractolysis will be provided by CEC.
2.
Fouirment t'ualification Branch Eased cn CSE guidance for the prescribed envircnmental conditiens asscciated with hydrcson burning in the Secuoyah ccntaineent, ECB will provide timely evaluaticns,' to CL and coordinated with CSC for the January 1981 and January 19E2 license conditicns. ECB, with input frem other technical tranches as necessary, accepts as complete cr recomends revisions to the list of the essential equipment needed to assure plant safety in the event of degraded ccre accidents involving hydrogen burn events. Secondly, the EQD will perform an assessr.ent of the survivability of all that equiprent including the need for rest of " hardening" of selected pieces of that equipment. These determinations and assessments will be based on criteria established by CSB.
3.
Reactor Systems Branch Based on CSB guidance RSB will review and accept or recomend revisions to the scenarios that lead to degraded cores and hydrogen releases.
4 Structural Engineering Branch i
SER will review the prior assessment of containment structural response to determine whether any changes are needed to the prior strength findings when modified environmental concitions as provided by CSB are taken into acccunt including the response of selected containment volumes to localized detonations.
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, NOV 2 0 1980 5.
Chemical incineerine tranch The Chemical Engineering Franch (CEB) will evaluate TVA's design and analyscs of ccmbustion potential ice ccmpartment foam insulation, using CSD guidance on hydrogen burn profile, and will conclude wFether design modifications are required to prevent significant releases of gasecus ccebustien preducts. CEB shall additionally provide fire assessment input to E00 en equipment survivability, e.g., cable failure, etc.
6.
Peliability and Risk Assessment Rranch The Reliability and Risk Assessrrent Branch (RPAE) using CSB guidance, will provide an assessment of the relative probability of degraded core sequences compared to the probability of all core ::elt sequences loading to significant risk; and assess ccmpleteness of the various scenarios consicered by TVA.
7.
Licensine Branch.50.
2 All requests for additional information for treetings with TVA and laboratories associated with the Secuoyah hydrogen control program shall he ccordinated with the Project Manacer. LB #2 is responsible for the final preparation of the SEP based cn staff input as identified abcVe.
This Temorardum reficcts all clarifications that were given to the Project Panager by your groups fo11cwing our meeting Firday morning, November 7, 1920 on this subject. Should you have any further questions, centact me imediately.
W Darrell G. Eisenhut, Director Division cf Licensing cc: FRR Assistant Directors NRR Branch Chiefs C. Tinkler 0/1 1_
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PEMCRAf!DUM FCR:
D. F. Ross, Jr., Director Division of Systems Integraticn F. Schroeder, Acting Director Division of Scfety Technology R. H. Vollmer, Director Division of Engineering FR0":
0.sG. Eisenhut, Director Division of Licensing
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SUBJECT:
SEC'J0YAH HYDROGEN CONTROL 900GRAtt N
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Curing the initial review of the ny/drogen matter on Sequoyah, the Division of Systems Intagration took the overall lead in the review. Suosequently, it cecame apparent that the other,dlyisions in.NRR should beccee integral parts of this review. The staff is man; fated by Coanission directive to provide its bases for adequacy of the hydrogen Aontrois systera by January 31, 1981 (see memo Chilk to Dircks dated Septecoer 24, T980).
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Areas of responsibility for the various'tiRR branches in the conduct of the Sequoyah*1ydrogencontrofprogramwerefiritiallyoutlinedinanL.Rubenstein to 9. Ross, 0-GSI memorandum of Octooer 91 1980. To assure that no misunder-standings arise which could adversely affecA our licensing efforts, additional reinforcement and extension of this discussf 6n of responsibility is needed.
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Cased upon the Connission's action dates, our e' forts should be channelled in the direction of short and long term programs wi completion dates of January 31, 1931 and January 31, 1982, respectively. Short t action involves reason-able assurance for interim hydrogen control system hereas the long term action is for the final fix. All requests for information d meetings should be coordinated through the PM Carl Stahle (extension 284t().
It also may be necessary to modify this plan as the review progresses to accomodate changes and requirements as they developed.
The short term schedule that we will follow requires SER inputs to PM by December 5,1980 for an ACRS meeting in January 1981'. A Comission briefing will be held about the middle of January 1981. The long term schedule will be developed later.
Accordingly, I propose the following revision to proposed " work elements for each branch:" as outlined in the Ross Memorandum.
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O F6RC') 308 Q9 769 NRCM OS40 DU.S GOVERNMENT DRINTING OFFICE: 1979 289 369
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P g ire.ent Fjgtems Franch. Off The CFn centinues to retain pricary responsibility for assuring that the overs 11 requirements and M9R needs of the Sequoyah !'2 centrol prcgram fer the above January 31, 1981 Cate and the subsecuent and January 19"&
date of License conditions 2.D.(2) are defined. CSF is resrensibi for the technical cecrdination of the efforts cf cther branches, as
.entified delev. Secting and scFedulino disagreements should they occu will be raised to the arprcpriate sucervisory/manaccrent ievel for inredi
- resolution.
Additicrally, C!" will to responsible fer evaluating the ficacy of the Interim Distribution Icnition System (ICIS). It will a o evaluate related testinc orograms and tre effectiveness and requireme.s fer the hydrogen
~cnitcrine system, the titernetive mitiratinc nys,tyms sbculd tre frIS' rreve uractertabic.
Sdd esrcosible for specif.ving the hyrdrocen ecnerated s(ticnally, C5" shall be norces and rates.
Ir.ut will be provided by CEE cn this matter.
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Cruinmet r alificatier. Franch
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e Pased en CSP quivance for the ree ed envircemental ccnditicns asscciated with hydrecen burning in the SectI[scrah centainment, EC9 will previde timely evaluatiens, to CL and ccordinat,zP itF CSC for the January 1951 and January ICEP license conditions. ECF,fwith neut frcm ether technical branches as race!sary. ecccpts as ccerlete nr rec ends revisions to the list cf the essential ecuip: rent needed to assure p%nt safety in the event of decraded f
cera accidents involvinc perfer.m an assessment c,y.ydrocen burn events. Seccndly, the ECP will s
the survivabilit, cf all that equipment including' tha need for most of "Fardening" of select. pieces of that ecuipment.
These detemination and assessments will be based on criteria etablished by CSB.
3 Peactor SystemsA' ranch Cased en CSP utdance R$B will review and accept or ecerrend revisiens to the hydrocen turn scenarics.
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/.. Structural Encineerirq 2 ranch FED yill review the prior assessment of containment ultima, strength to detervnining whether any changes are needed to the pricr stre. oth findings y6cn tredified environmental conditions as provided by CSB are tairen inte acccunt. In addition, the SEC will evaluate the containment structural responses to select deteration events as determined by CSG.
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N IC F'Z R M 318 (9-76) NRCM 0240 DU.S. GOVERNMENT PRINTING OFFICE: 1979 289 369
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' The Chem.ical Encincering c, ranch-(CEP)" Dill evaluate T"A's desier ar.d analyses of cc.ctustien potent 1al ice ccenart tent fcam insulaticn
> using CSP guidance on hydrogen f urn preffic,' and vill conclude iether desice ~ceific.* tiers are recuired to prevant significant re,1 3er cf
@asectis crebustien creducts. CrS 'shall additir.nally prov.e firo assesscent ircut to ECB on ecuipreent survivability, e.
, cable failure.
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Pelishility and Pisk /.ssessrent Pranch The Doliability and risk Assesscent Parch (p? <) usico CSP guidance, will rev1Aw 7"a's risk assesstent analyses and r ovide 4ts evaluatien of the ccrrectr.nss and. ccerleteness of the varir.s scerarios censicered by TV/.
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,t-s yx f T1 ractierts fer additicnal infer 7aticn fcr meetincs with TVA and lat re-terias asscciated with thj\\'ecuf9ah hydrecen centro ( rror: ram sball Pe coordiered 9 th +50 Pr.nject 'Miaccr.
L" ?? is resrcnsible for the fir.a1 4
prer3raticOcf the SEP bar.c in staff input as identified abeve.
s I succost we ipet as soon ar/pessibi ce this tatter.
The interir: rule en M>drcranwillbediscussepattheACR., r fovember 5, 1020. In additico ACPS has requested a sta)fis recort en fa rday, Neverter 9,1C8C. It is therafere, icTerative t sat we set forth a
- lly cocedirated pregram at this tiire. Should ycu hav. any auestiens contact e irmediately.
Darrell G. Eise ut, Of rcctor Divisien of Licen-ng cc: Assis[ ant Directors Frar 'E Chiefs
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Multiple Addressees,
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Chemical Engineering Sranch The Chemical Engineering Branch (CEB) will evaluate TVA's deskgn and analyses of combustion potential ice ccompartment foam insulation, using CSB guidance on hydrogen burn profile, and wil conc'lude whether design modifications are required to prevent significant releases of gaseous combustion products. CEB shall, additionally' provide fire assessment input to EQB on equipment survivability /e. g. cable failure, etc.
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Reliability and Risk ssessment Branch
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The Reliability and Risk' Assessment Sanch (R AB) using CSB guidance, will review TVA's risk assessment analyses and/ provide its evaluation of the correctness and completeness'cf the various scenarios considered by TVA.
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Licensing 1 ranch "o.
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All requests for additicnal information from meetings with TVA and 1aboratories associated with the Sequoyah hydrogen centrol program shall be coordinted with the Project Manager.. L3 42 is responsible for the final preparation of the SER' based on staff input as identified above.
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I suggest w meet as scan asjossible en this matter. The interim rule on hydrogen will be discussed,at the ACRS on November. 5, 1980.
In addition ACRS has requested a status report on Saturday, November 8,1980. It is therefore, imperative that we set forth a fully ccordinated program at this time.
abould you have/any questions contact me imediately.
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Division of Licensing
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cc: Assistant Directors Branch' Chiefs
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DISTRIBUTION:
Docket File 500327/328 NRC PDR Local PDR NRR Reading LBf2 File DEisenhut RPupple RTedesco ASchwencer
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i NIC FORM 318 (9 76) NRCM 3240 DU.S. GOVERNMENT PRINTING OFFICE: 1979-249-369
ME"CRANDUM FOR:
D. F. Ross, Jr., Director Division of Systems Integration F. Schroeder, Acting Director Division of Safety Technology R. H. Vollmer, Director Division of Engineering FROM:
D. G. Eisenhut, Director Division of Licensing
SUBJECT:
SEQUOYAH HYCROGEN CCNTROL PROGRAM
'N -
During the initial review of the hydrogen matter on,S' quoyan, the Division of e
Systems Integration'took the overall lead in the review. Subsequently, it became apparent that the other divisions in NRRihould becone integral parts of this review. The staftNis mandated by Comission directive to provide its bases for adequacy of the hydrcgen control systeur by January 31, 1981 (see memo Chilk to Dircks dated Septstoer 24,1930)~.
Areas of responsibility for kha various NMR branches in the conduct of the Sequoyah hydrogen control progbam.were initially outlined in an L. Rubenstein to D. Ross, 0-OSI semorandum of SQctober 9,1980. To assure that no misunder-standings arise which could aaversyy affect our licensing efforts, additional reinforcement and extension,of this 41scussion of responsibility is needed.
/
Based upon the Commission's action date our efforts should be channelled in the direction of short and long tem prog s with cmipletion dates of January 31, f
1981 and January 31,f1982, respectively.
rt te-t xtion involves reason-able assurance for,fnterim hydrogen control s tem screas the long term action is for the final fix. All requests for infoma on and meetings should be l
coordinated throu,gh the PM Carl Stahle (extension S474).
It also may be necessary to mo'dify this plan as the review progress to accomodate changes l
and requir, ts as they developed.
I The short/ tem schedule that we will follow requires SER in ts to PM by Decembef 5,1980 for an ACRS-meeting in January 1981. A Coimission briefing will be held about the middle of January 1981. The long tem schedule will be developed later.
Accordingly, I propose the following revision to proposed " work elements for each branch:" as outlined in the Ross Memorandum.
N OFFICE h.
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OATEk.
l NIC FORM 318 (9 76) NRCM 3240 DU.S. GOVERNMENT PRINTING OFFICE: 1979-289 369
nitinle Fdresses 1.
Centair-ent ?ysters Pracch, D!!
it.e CFP-continues to retain erfrary responsibility for assuring that the overall requirenents and.:RR needs of the Secuoyah "2 control pregram for the above January 31, 1981 date and the subsecuent and January 1980 4te c' License cenditicns 2.0.(2) are defined. CSF is respensible for i
the technical eccrdination of the ef#crts cf other Franches, as identified belcw. Sceping and scheduling disagreements should they occur will be raised to the arprepriate supervisory /eanagement level for imediate resolution.
Additierally, CSD will be responsible fer evaluating the effica y of the Interim Distribution Innition System (ICIS). It will also ev ate related testinc crograms and the effectiveness and rec,uiretrents fr the hydrogen
?cnitorine system, the alterrative mitigating systerrs sjxuld the ITIS prove % cceptabic. Acditionally, CSE shall be resop#sible fer specifying the hyddrg on generated so,urces and rates.
Input ' 11 be provided by CEC en this. mate r.
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Fe.uin ent uali, cation Cranch
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_.N Pased on CSC quidance for the prescrib. environmental ccnditions asscciated with hycrecen burninhin the fecucy centain ent, ECF will previde tirely evaluati ms, to CL and ccedinated, tF CSC fer the January 10El and January 19EP licarse ccnditions. ECP, wJth input frem cther technical branches as necessary, accepts as ccec r recc:: rends revisicos to the list of the essentialecuipmentneeded{et assure plant safety in the event cf degraded cere accidents involving regen turn events. Seccndly, the ECP will perform an assessreent of he sbvivability of all that equipment ircluding nd assesse\\of selected pieces of that equipment.
rdening the reed for test of "
e s will be based on criteria etablished These determinations by CSP.
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Peactor Systems.. ranch Dased on CSP quidance R$B will review and ccept or reconrend revisicns to the hydrecpn burn scenaries.
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Structural Engintsti.nn Branch
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!Til vill review the prior assessraent of containment ltimate strength to determining tihether any changes are needed to the pr strength findings when ecdified environrental conditions as provided by s,.
are taken inte
,acccunt. In addition, the SEC will evaluate the contain:n
't structural responses to select detenaticn events as determined by CSB.
s OFFICE h.
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NXC FORM 318 (9-76) NRCM 0240 DU.S. GOVERNMENT PRINTING OFFICE: 1979-289 369
"niticle Addressees S.
CFeeical encincerina Fraech 7.e Clerical Encincering Eranch (CEF) vill evaluate T"A's cester and analyses of cc:tustion pctential ice ccreartment fear. insulatten, using CS$ guidance on hydrogen burn crofile, and will conclude whether dasice redificatiers are recuired to prevant sienificart rele? ras cf gasecus centustien products. CCS shall additicnally previce fire assesstent input to ECR cn ecuireent survivability, e.
9., cable failure, etc.
6.
Pc11 ability and aisk Assessrent Franch The "eliability and Disk Assessnent Sanch (^0AP) using CSE qu acce, will review TV','s risk assesstent analyses and provide its eval icn cf the ccrrectms and ccrrieteness cf the varicus scerarios cc.sicerad by TVA.
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7 Licensinn "rancb Pc,
ST) recuest'sver additicnal informaticn fcr ecetincs with TVA and latora-teries asteciateg with the Secuevah byerece centrcl procrar shall be cocedintee with th :'re.'ect Parager.
L" ' is resrcnsible for the firal rreraratico of the 5*$ hased en staff i ut as identified above.
'I succest we teet as seen as ssitie e this ratter. The interir rule en bydrcren will be discussed at t.
ACP" cn ?!cverter 5,1980. In addition AC.CS has recuested a status reror% pr, Saturday,.'icveder E, ISEC. It is therafere, imrerative that we set /crth a fully coordinated prenrae at this s
tiee. Should ycu have any quest fens nntact re imeciately.
Darr 11 fi. Eisenbut, Director Divis n of Licensing
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cc: Assistant Directors Prarch Chieft l
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NRC FORM 318 (9 76) NRCM 0240
- U.S. GOVERNMENT PRINTING OFrtCE: 1979-289 369
DISTRIBUTION:
Docket File 50-327/328 NRC PDR Local PDR NRR Reading LB#2 File DEisenhut RPurple RTedesco ASchwencer CStahle MService I&E (3)
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