ML20003F522
| ML20003F522 | |
| Person / Time | |
|---|---|
| Issue date: | 02/17/1981 |
| From: | Fraley R Advisory Committee on Reactor Safeguards |
| To: | Dircks W, Rehm T NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| Shared Package | |
| ML20003F521 | List: |
| References | |
| ACRS-GENERAL, NUDOCS 8104220244 | |
| Download: ML20003F522 (3) | |
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i ADVlsORY COMMITTEE ON REACTOR sAFEGUAR0s s' g%c[ f W ASmNGTON. D. C. 20555 FEB 171981 Willia., J. Dircks Acting Executive Director for Operations Attn:
T. Rehm Subj:
246TH ACRS ACTIONS, AGREEMENTS, ASSIGNMENTS, AND REQUESTS Based on discussions regarding methods for improved implementation and folicw-up of ACRS recommendations, the Committee agreed that a summary of Actions, Agreements, Assignments, and Requests made during each full Ccamittee meeting will be sent to the NRC Staff following each meeting.
Attached in response to this agreement is a summary for the 246th ACRS meeting.
This list has the ccncurrence of the ACRS Chairman and designated ACRS members as will all future lists provided for follow-up purposes.
Those items in the " Actions, Agreements, Assignments, and Requests" that do not deal with requests made of the NRC Staff or that are not pertinent to NRC Staff activities have been deleted.
Please note the appearance of a series of numbers on the attached ACRS letters and reports.
The numbers will identify the "ACP.S requests" to the NRC Staff, and are being used by the ACRS Office as control numbers to these requests.
We would find it helpful if the NRC Staff would use these numbers to identify their responses to these requests. Questions regarding this system can be addressed to J. M. Jacobs, 634-1406.
R. F. Fraley Executive Director cc:
C. Michelson, AE00 H.- Denton, NRP.
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R. Minogue, SS T. Murley, RES V. Stello, ISE R. Cunningham, NMSS ACRS Members attachments:
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ACTIONS, AGREEMENTS, ASSIGNMENTS AND REQUESTS 246TH ACRS MEETINS, OCTOBER 9-11, 1930 1.
Seismic Qualification of Auxiliary Feedwater Systems The Committee prepared a memorandum to the Executive Director for Opera-tions providing its comments on the use of quantitative risk analysis in making decisions regarding the seismic qualification of auxiliary feedwater systems.
2.
ACRS Comments on ATWS The Committee prepared a memorandum to the Executive Director for Opera-tions requesting the NRC Staff's views regarding the reliability of the GE BWR/5 nuclear pcwer plant high pressure injection system.
3.
Bincham Amendment The Committee authori:ed a memorandum from the ACRS Executive Director to the' Executive Director for Operations providing comments on the NRC Staff's preliminary plans for addressing the requirements in Sec.110 of the FY-80 NRC Authori:ation Sill (Singham Amendment).
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SCHEDULE OF 1981 ACRS MEETINGS Meeting No.
Date Meeting No.
Date l
249 Janu'ary 8-10 255 July 9-11 August 6-8 February 5-7 256 250 September 10-12 251 March 12-14 257 April 9-11 258 October 15-17 252 May 7-9 259 November 12-14 253 254 June 4-6 260 December 10-12 l
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In e letter :: y:u date: Jur.e 10, 1980, the Advisory Committee on Reactor its ::n:ern :nat the NRC Staff's level of effort in Sa'e; ar:s ex;resse:
re.-ie r; :ne seismic qualifi:ation of auxiliary feed ater systems mign not bc ::r.siste-; witn ti.n ly resoluti:n of the ma :er. We re: mrende: that :ne ne: essa 9 ma ; aer be comitted t0 assure completicn cf the Staff's.sh:rt-We recomrended also tnat the affe::ed tera review in two or three months.
licensees per':r.., indepen:e. reviews of this matter en the same time scale.
I r. a men:randu- :: Chair..ar Ahearne date: Au;ust 27, 195: Harold R. Denton transri::e: a me : rand.. cated August 8, 195; fraa R:ger J.
Mattson to Da-rell 3.
Eisennu; wni:n des:ci:ed an interi-risk stu:y.
Mr. Denton inc4:ates that the risk to ne pu lic health and stated :na: the stu:ythree yea-s is a::e;;atle and tna; the plants could be safe:j for ;'ie nex Mr. Den:On also stated pe-M.ed to continue :: c;erate durin; this period.
a ::ancing analjs:s. usin; Ocr.servati<e assum;;iens regardir; seismic t r.a t ca a;e :: auxiliary f ee: water equipment, sn:ws tna; operation fer the next seve-a' m:nths w:uld net result in an una::a::a:le increase in risk to the pu:lic.
We c:ntinued to review this matter during our 246th meeting, October 9-11, In our review we had the benefit of a Su:c0=ittee meeting on Octo-1950.
ber 6, 1950.
We effer :ne folic.ging Observati:ns and recc=endations:
The interim risk analysis perfor. e by :ne Staff is useful. The Com-m 1
mi :ee notes that this study does not a;; ear 0 have been subjected to incependent peer review or given the necessary degree of quality assur-an:e that a risk analysis, which may enter importantly into safety decision making, should receive.
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The A;;.:n 5, lii: me :-ance fro-F. ;a-Ma::s:n does n:t provide the expe::e: P-re a -J, va'.e of risi.
Since detaile: Knowledge of all the com;: e.:s, e;.i: e.:, and systen s im;;rtan: to tne auxiliary feedwater f ur:- i:- is n:t availe:J.e te :ne Staff, it is not clear that a s und basis er s.s fer : e te s " conservative" or "very conservative" wt.ich are use: in this me :-and m.
Unte-these circumstances, it is possible tnat f:r one er m:re c' tne plants, the risk will be found to be larger ina-ina; estir.3.ed.
3.
Tne Stafs es-ated risks Of a seismi ever.: causing a serious accident 1:ss of sn.;c:,.;- heat rem: val ca:atility range frcn six to fifteer.
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tiras the es:1 ate: rist cf core melt due :: all causes for the PWF.
exa-ine: in e.5 -1:20.
The Staff has pr:;; sed a course of action in te~rs et tnese es-i 3:ed ris(s whien implies a quantitative safety goal a.2 a threst.:1: risk level fcr :er: air kinds of a:: ion.
Such safety g:als 3-: a:.icn levels may pr:ve 10 te a::e; table to the NF.C after revie,. an: esalvati:n.
%eser, we believe that these sh0uld not be:Ome ce fa: : :-ite-ia wite:.
- ne benefit cf pr::er censideration.
Further-h: e, in the a:se ce Of an evaluati:n of :ne un:ertainties in and.the ex,e: e: va'.e of t r. 3 ri s r., the risk esti ates presented may not be re;-ese. ative of :ne a::ual risk.
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4 Tne ri s.: est' a:es ;-esente: in the mem:rancu-from Roger V.attson of A.,.s 2, In: a a large en:v;t, if a :. ate, t: warrant considerable p r t :-i ty y V e NE. ar: the affe :ed utilities.
In particular, efforts 5 3:.1 : :=.3:e :: be ter ; Jar:4fy the risk on a plant specific basis in tre nex: fe.. cer.ns.
Furthe-:: e, se recommend tha; ea:h affected revie.. nis s;e:ific piant design and to take early lice see se as.:e re e: al
.eas es, as pra::ical, if :nere is reason to suspect that any i.:: an as;e:: cf ne auxili ary feednater syste-is likely no* to p e -f, r-r i.s, f un::icn during an earthquake similar te a safe shutdown eartn: 4 e for the plar..
5.
We agree with the Staff tnat high priority should be given to resolu-tion cf this ma :er.
We expe:: to continue to follow this subject cl:sely.
Sin:erely, 7
Milton S. Plesset Chairman P00R ORlGlMI.
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ACP.5 C0'Mh75 Ch AT45 In it's A;ril 15. 1950 letter on AT45, the A RS ce=ented that "For new GE plants and those in early stages Of cons: u::icn, it is re:2nended in:ressed reliability be in:crporated in systems wnich can celiver water to the vessel under the operating pressure ex;ected after an AT45".
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This ree:renda: ice was based primarily on the Cc=ittee's interpretation of operatin; ex;erience witn early BWs and was n:t meant to imply that
- na E4~ 5/6 system necessarily had similar ;reblems.
It is the Oc=ittee's understanding that the Staff's concerns abcut high pressure inje::icn syste reliability were also based on perfor:ance of earlier 5'4 systems.
p.g. g g Please ;*cvide us *.he Staff's view on whether the SG 5/5 system is judged ic have ne relia:ility a;;;re;riate to a scarce of high pressure water wnich cign: :s neece: under AT45 conditiens.
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ME'G'NDU ' FL R : William J. Dir:ks, Exe:::ive Di for Operations FR P,
Ray :nd r. Frale., - :nive Lirector, ACRE SJEJE;T:
CU":'ENT! ON THE NRC STa?F'S FRELIMINARY PLANS FOR ADDRESSIN3 TriE REM,, REAI'~5 lh SECTION 110 0F THE FY-80 NRC AL*THORIZA-iw :
Durin; its 246:n meeting, October 9-11, 1980, the ACP.S dis:ussed with the NP.C Staff :neir ;-eliminary plans for ad:ressing the requirements of Section 110 of the NRC F1-3C Autnori:s-icn Bill.
Tne Staff also discussed tnis subject with :ne Rea:::r Operations Subce=ittee en October 7,1930 and requested ACRS c:=e.:s.
Tne C =ittee had :ne benefit of written cements by the Atomic Indus -ial For.
80 0 5 - Q0l It is the C:=ittee's view that tne lists cerived from Criteria II and III as curren:ly ;resente: cy the NRC Staff de n:: include all the items of particu-(
lar si; nfica.:e :: safety.
Fcr exa ple, General Design Criterion 29 is not include.
Ac:itional screening sn:ulc be c:ne to ensure that all items of parti:ular si;,ifican:e are incluce:. Tne Cc.ittee also rec:=, ends that some c:ner gre, s wi:nin :ne NRC Staff, su:n as PAS and AE00, carry out an inde-pen:e~. re ie in er:er to increase :ne likelin:cd that the screening process has n:: c- ::e:
e.s Of pa-ti:ul ar significance.
This review could also De used to esta:11sh a priority, based on risk reduction potential, in wnich the review i;e.s shoul: be addressed.
The Comittee noted your com.nent on SECY-80-414 and endorses your intent to im;lement tign: management controls to limit staff and incustry effort to areas of P0tential safety payoff; guarding against tne potential for a large drain en St af f anc licensee resources that would not produce ccamensurate im;rovemen s in safety.
The Corinee w vid aparecia:e being kept inforced of aceiti:nal cevelo: cents in this area, pa-ticularly en tne nature of co -
ments receivec as a result of the call for pu:lic co=ents scheduled to begin fcilowin; issuance ey the Staff of the final draf t plan for accressing Se::i er.110.
cc: ACRS Memders H. Denton, NRE F. Schroeder, CST M. Ernst, DST G. Zech, NRR
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.-.a William J. Dircks Acting Executive Director for Operations Attn:
T. Reh, Suoj:
2 7TH ACRS ACTIONS, A3REEMENTS, ASSIGNMENTS, AND REQUESTS Sased en discussiens regarding methods for impreved imple entation and follcw-up cf 'C25 recc=,endations, the Coccittee agreed that a summary of Actions, Agreements, Assignrents, and Requests made during each full Cc==ittee reeting will te sent to the NRC Staff folicwing each meeting.
Attached in respense to this agreement is a sum.ary for the Et7th ACRS meeting.
This list has the concurrence of the ACRS Chairman and designated ACRS members as *ili all future list ; previded for folicw-up purpcses.
These items in the " Actions, 'greements, Assign ents, and Requests" that dc nc. ceal nith repuests made Of the NRC Staff cr that are net pertinent te NRC Staff acti.ities have been celeted.
Please ncte the acpearance of a series of numbers en this decurent.Rie numbers will identify the "ACRS requests" to the NRC Staff, and are being used by the AC:S Office as control numbers to these requests. We would find it helpful if the NRC Staff would use these numbers to identify their responses to these requests.
Questiens regarding this system can be addressed to J. M. Jacobs, 634-1406.
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C. Michelsen, AECD H. Denton, NRR R. Mincgue, SS i
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ACTIONS, AGREEMENTS, ASSIGNMENTS, AND REQUESTS 247TH ACRS MEETING, NOVEMBER 6-8, 1980 1.
During discussion of the Diablo Canyon Study on seismically induced systems interactions, M. Bender requested that the NRC Staff provide the Committee with a list of items still outstanding regarding the issuance of an OL for Diablo Canyon., B. Buckley, NRC Staff, agreed to provide such a 1ist.
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80-11-01-Q01 2.
The Committee requested that the NRC provide man-rem doses resulting from the planned " walk-through" of Indian Point for the systems interactions study suggested by the Committee.
The NRC project manager will be requested to provide this information 80-11-02-Q01 6
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