ML20196G304

Discusses Which Expressed Concerns Re Need to Commit to Installation of loose-parts Monitoring Sys at Const Permit Stage of Skagit Nuclear Power Projects Licensing Review

ML20196G304
Person / Time
Site:	Skagit
Issue date:	07/20/1978
From:	Vassallo D Office of Nuclear Reactor Regulation
To:	Mecca J PUGET SOUND POWER & LIGHT CO.
References
NUDOCS 9907010122
Download: ML20196G304 (5)

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JUL 2 01978 l

Docket Nos. r0-5

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.c Your,1etter of April 17, 1978, axpressed yout, concerns re.jaroini tnhneed r-)

gto:conmit to the installation of a Loose-Phf ts'honitoring Jyste ( @je)ct

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' QatEthe1 Construction t'ermit. (CP) stage' of LIle"bkAgit nuclear Powe y

1ro Lidydsing review.

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4 ' 'Ineistaff/ considers the existence of loose parts-in a reactor system to' l)

C ibe;a;significant salety concern. On this basis,;we have requirea the i

jin section 4.4 of. the Standard lieview Plari@lcitEG-75/Od7)'and'has oeen

' f.i 1 installation of a br44S on nuclear plants. 'hiis! requirement is 'docuaented.

p iinieffect since the issuance of the SRP iri ' late 1975. It is not an area.

v4 in which voluntary participation is requestek. Further guidance on' tne

.I Sdesign.of a LPIE.wtiich meet our requireraerit's';:is:containea inlthe proposed i

For a constructio'ri b' rmit application, your PSar legulatory Guide 1.133.

e must' include a condaltent to the system.

- As' a result of a stuuy ve conducted on the;ibstallation of, and experience

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qwith, loose ~ parts monitoring systems in opetating plants,.we have identifica i

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following aspects for a loose parts nonitoring syste:n wnich we will' use i

.Ito! assess the accepta'oility_ of the specific.pyst.ea_ to be provioed for tne

'iskai,J t'; Nuclear Power Project when we revise';hhe. detailed information to _

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1eisui:mitted in. the Final Safety Analysis it6dort:

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1.,.Tne description ot the loose pai ts r.onitoring systera shall.in:J L.de

-f!the' location of.a11 sensors and the method Ior.monituring then. A minimum of two sensors will be required at each natural colle.: tion

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'the oescription of the nonitoring eculpmnt shall include the levels and the basis -for t.he alara settin';J.

In adiition, tne aanJf btdrer 'd sensitivity sp'cifications for the equiriaent shall ue proviam.

Anticipated saajor cources of internal and external noise snal1 se identillied along,.ith the plans for miniraizing the effect; of t;.eco sources on the ability of tne honitoring equipaent tc wrfor.. its intendeo function.

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Thel loose parts ronitoring system anall be requireo to function l

after any seismic event for which plant shutdown is1not requirev.

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.The procedures of Regulatory Guide 1.100,. " Seismic Qualification et

' Electric Equipment for'illiclear Power Plants," ~are acceptableior

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demonstrating the seismic qualification of the system. An exception

. -toothis; seismic, qualification is that recorders'are not requireo pep 4n. unction within' theirTspecified accuiacy.during or tafter: seism

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tstwithout Lmaintenance. : However', W nitor.ingl(ElarnPan'/orlinai;

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l Mcation); capability must remaih aVailsbib 'forftbat channel?at?al1Jtimes; Y,'

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Diduifing,and;after:the seisinicleVehtf A t16scri;fti of6t W precautions ptolbe tsken to assure the opetibility df'the sys m%ftirfanoperhting-I$r' Mh? -

d dssis: earthquake shall?bb prOdided.'

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' MIdiMkM7 l 'iat' LPets are st'ill?in ihe,k IN ~7%

L Thesstaffragrees"tl develbpraentistagegregarding u

6pt'iin'lidsensdr iocation sbd diagnostic.fri srprehati6nE6fisensordslinals..

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HoWeVeEKthe piisiary objective of A LPtIS neting ddrlhiinimaldequiresnts l.

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isfn66 toidisgnose the safetp ' sign d icanbs dfidiloo n part7 butito: detect.

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.itif ' stiehcejsuch that 'the :safetvisignificance. can be. ass' sshdJanJ:aopro-e f

z d6fr.dctivelactionitsken:if necessafy.d:I'hecstaffr" celi 6ves th5tItne

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in loMdpsr a t ion, ? arid :ma inishance te' clin 61ddyL foNaILPNS', %I ong. w i th l

s,. y giQ" i1'ity lt6: detect;the :existerice of fiboseipa'rts7/isistifficiently '

f fde f $nd..demonst. rated ' to warra"ntiits $clusion':in /iheyl dnt des ign "

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%g " yht h6 (iseWTo (this.Offect Awe;polnt.o6tfthat3thefconc1"usions Of;the;

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P vf6r,$ysEitidpl(OREM4URIE/IM-133)i ars;d6nsistentpith;theiressnt'(staff pos l

i thisetobjictives.

l ath&?cbncidsions of:this study andithe staff requirements are'because ORSL 2

asinsssdjthef capability of thei LPtSito perfbtm'5s}a!plantspiotection system.*,

i MsEsff fcdh'sidsis : the l LPNS !to'bsO safetp 4 el ated vsystemi Wdichlis -not 6

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', '.' trh diteditd/perforni'sutomatic protketive actions other?thanFalarin fun:tions. t s

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,u my Ihbi oukconcern 6f the capiability bf a LPhl3 to detect 'the existence k

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< ;/,9offloosefparts/ considerable e'xperience, b' th ;in the! United States and o

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lel1 of,tne value-impact 7;

iabr65d;has!bberi obtained.1You arO referred ' o( lwhichjcitsscrelevant LW 3.#

f6ripr' posed Regulatorp, Guideg g33,

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h itence!with_ loose partsiincludli@many; instances in:which;the: loose part% g.

gi dd tEdtbd: by blib7LPIS. lIn addlElon j ! the' LPFG', detection]o f ;al broken "

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MbM 161pdidon#f6d and'holdd6wn" spider, pakts.Of yhictiLeaused extensive -

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, f Ar'lbtto t6 Fr aley, " Draft 2, Revision 1, Regulatory Guide 1.133 ' Loose-

. PartiDetection Program'for the Orimary System of Light-tiater-cooled

'Heactors'" dated ilay 4,' 1978;. AVAIL \\BL2: USNRC Puolic Document ihm.

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JUL 2 01978 Puget Sound Power & Lbjht Company I damage to the steam generator tube sheet in the Crystal River Plant, is a recent and parhaps more significant example of the value of a LPMS to detect loose. carts prior to their causing extensive primary system damage.

Concern was also expressed that LPfB " pose a. serious, threat'to (USS

_ n availabllity.q..'j'Qonefof the benefits of CPdS'is;thefearly detection'

,o of s1106seipart sUchlthdt' corrective action can b'e,quickly'.taken.'

.a UndetspledJloose parts, besides presenting a realispfstpconcern, have 3

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.thb t tial to causeisignificant damage, requiring'liitendedYoutages!

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, Lt;6.,mlpo enak'elthe 'necessaryj repairs.; The,irapact"on plint'availhbility wasjM

' 'assessediin Lthe;v'albefiripact Jstiatement for propos6dliesulht' ltjGuice(c.

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..lsl331w61ch'we believe addresses your concern foEtM neediofdaEvalu6-:

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v li.1 pace dtktement)/andEindicated,that a 'LPfG wo' lofudst611kely oenefitJ u

J plantTdvailability.'? hn examp1'e 'of this is the. Crystil niver case'.

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.y Continued (operationof.otherplants'ofthe' Crystal l River,typehasoeen

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partly justified 1ori;the basis that LPMS are installed iniall-of~ these plants land;willsd(teEt failures of fthe.holddown mechanisms fdr poison)

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'rodsjandl; orifice plUgskbefore ;atsafety problem resditsi,

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(In' your.!'1etter, ydu %.4,,. mtated that instrument signal noisevshacinstallea..

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-A 4M ' cf16w3pst'rumentatiodjiistoriedily detect vibiationsldnd' loo'se rparts.I.

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.We&$redMatthis$1nhtrumentdtionprovidesades'ir'a61elabjmintationD it'isnotzadeauatelintlieha.

6'ttolttie!LPfE[detectdoscapab'ility..However,hion of;1obse. farts l hith -

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!absenceiofla'dedidated system;for the.detec

'1associafedisensitivi.tles, alarm se' tings,.and required? actions designed f

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Ydu"$1kstate'iniydur:l'etter the difficulty of inspecting lthe lower-J plenum of'a?BQR in'.th'e' event'a LPIB indicates a loose part'inithat region'.! While w'elackdowledge.ths diff.iculty of such an inspection, we do not' consider thisitio be.a valid argument t.o' ignore the. existence.

1 Q' 9 flofis1lo6sE?part inithsSlower plenUni which could potentially.: affect tne

.4:JsafeEpibfithe"plantE 1

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.. ;gn yny;drlclaihEhatb SAR' accident andlyses will: encompass the most-l.

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$ severe consequences:ailoose part:could cause iraphies.diprimary, reliance 3

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, 'bri'f systedtCthat raitigate the. consequences caused by. loose parts.

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~.' ipdinti 6ut1that the[Comnission safety philosopny relies fi'rstlyTon the tprevsntion of accidents, whi'en.is the primary basis for ourc requireraents to1 include:LPMS in nuclear plants, i

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In conclusion, we have, carefully considered each of the items identified in your letter and:cannot conclude they-sufficiently justify deferral

. of a coianitment to' install. a LPfG.

We.. conclude. that there..is sufficient ghsis',to fsupport our' recoctnendation t6ithe ~ Atomic ' Safety and%icdpsing

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TI36ard to[ condition:the~c~ 'nstruction'pOmit for, the Skagit Nucle $r'. Power :

o i'SProjectjequiring the installation of a LPMS in therewnt'tliis niatter

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..-remains ats issue JS,

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In conclusion, we have, carefully considered each of the iteras identifie:J

-in your' letter and:cannot conclude they sufficiently justify defet ral of a comnitment to' install a LPf6. We. conclude.that there..is sufficient rNI.sisisL to supportbout recoranendation t6;the Atomic' Safety.and%icensing T BoardIEo ' condition the' construction'pbbmit fo'r the Sliagit NucledhPower Projectjequiring the' inst'allation of.'a LPt.1S ih the? event'ttiis idatter

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'remainsLat. issue.

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Puget Sound Power & Cignt Company,3n_... p

Hr. F. Theodore Thoiasen Perkins, Coi'e, Stone, Olsen-

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1900.~. Washington ~ Guilding

' Seattle,' Washington.98101 Mr.

Et Lowenstein

.Lowens'tbin, Newman, iteis' i

&.?Axelrad-SUibE.0214I[,

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)CMr.L.dicholas'D. Lewis i

" Chairman Energy' Facility. Site h

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V Esalliation' Council "P

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JSchrohter'," Jackson, Goldraark v.,,l and. Bender "r

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' Seattle,tWashington.9810]

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-Richard-M.'Sandvik, Esq.

Assistant Attorney General

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Department'ofJustice 1133:S.'W..Harket Street Portland, Oregon 97201 1-y'

.Mr!Lloyd.'N.[Marbet i

c/o;:Forel.aws'on Board 19142(S.' Bakers Ferry Road Boring, Oregon 98009 1

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