ML20196G304

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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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  1. #o UNITED 5t ATES

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g e- :E NUCLEAR REGULATORY COkhl%] %!][]{ %]

WASHING ton. O. C. 20S$5 ' " l

  • JUL 2 01978

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Docket Nos. r0-5 I and 5 -523 - l- l i [

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Your ,1etter of April 17, 1978, axpressed yout, concerns re.jaroini tnhneed

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-l ygto:conmit to the installation of a Loose-Phf ts'honitoring Jyste 1ro( @je)ct

[ ' QatEthe1 Lidydsing review. Construction t'ermit. (CP) %W stage' of LIle"bkAgit nuclear PoweI w,. ~

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

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jin section 4.4 of. the Standard lieview Plari@lcitEG-75/Od7)'and'has oeen
' f.ip 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 legulatory Guide 1.133. For a constructio'ri b' e rmit application, your PSar "

must' include a condaltent to the system.

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

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

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

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

'iskai,J it'; Nuclear Power Project when we revise';hhe. detailed information to _ i

. c;. 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

' -l region.

2. '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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l 3. 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 [

demonstrating the seismic qualification of the system. An exception '

. -toothis; seismic, qualification is that recorders'are not requireo i $tosf ?n y pep 4n. unction tstwithout within' theirTspecified Lmaintenance. accuiacy.during

However', W nitor.ingl(ElarnPan'/orlinai;d or tafter:

'h @b: seism l

i Mcation); capability must remaih aVailsbib 'forftbat channel?at?al1Jtimes; d

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. Diduifing,and;after:the seisinicleVehtf A t16scri;fti of6t W precautions -

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ptolbe tsken to assure the opetibility df'the sys m%ftirfanoperhting- I$r '

d dssis: earthquake shall?bb prOdided.' Mh? - "

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' MIdiMkM7 l 'iat' LPets are st'ill?in ihe,k

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  • Thesstaffragrees"tl L develbpraentistagegregarding ,

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

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l. ( HoWeVeEKthe piisiary objective of A LPtIS neting ddrlhiinimaldequiresnts
- '?" isfn66 toidisgnose the safetp ' sign d icanbs dfidiloo n part7 butito
detect.

! z f .itif ' stiehcejsuch that 'the :safetvisignificance. can be. ass' sshdJanJ:aopro- e i < i,j rl

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

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

i1'ity lt6: detect;the :existerice of fiboseipa'rts7/isistifficiently '

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

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

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l  ?,3 't l :P vf6r,$ysEitidpl(OREM4URIE/IM-133)i i thisetobjictives. ars;d6nsistentpith;theiressnt'(staff pos

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

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

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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

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!rbi.j Ihbi c houkconcern -

< 6f the capiability bf a LPhl3 to detect 'the existence ~

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< ;/ ,9offloosefparts/ considerable e'xperience, b' th o ;in the! United States and 7;

~7 t lel1 of ,tne value-impact .

iabr65d;has!bberi f6ripr' posed o obtained.1You Regulatorp, Guideg arOl g33, referred ' o( lwhichjcitsscrelevant LW 3.#

~ +g Ostik6itihriti itence!with_ loose partsiincludli@many; instances in:which;the: loose part% g.

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

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

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7 (1)9eference Draf t-Revision \2

  • ark 1'ststeMailability ;in.the PM .ri.eircranu;.?. 21 '

, 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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Puget Sound Power & Lbjht Company JUL 2 01978 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

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UndetspledJloose parts, besides presenting a realispfstpconcern, have 3

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

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

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

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

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

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

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

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

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

it'isnotzadeauatelintlieha. . .

' 6'ttolttie!LPfE[detectdoscapab'ility.

!absenceiofla'dedidated system;for.However,hion

'1associafedisensitivi.tles, alarm se' tings,.and

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the.detec t

of;1obse. farts l hith -

required? actions designed

$ff y pcpecifleallydorithe43eteetiod of 1cose par.ts. 1 - S' i-e ,:e1 ,ms . -

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 .

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. . ;gn yny;drlclaihEhatb SAR' accident andlyses will: encompass the most-in'a11ho l.

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

, 'bri'f systedtCthat raitigate the. consequences caused by. loose parts. .e W ,4

~.' 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~ o'nstruction'pOmit for, the Skagit Nucle $r'. Power :

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

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l ..-remains ats issue -

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4- M C0 IU 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

- 'l Projectjequiring the' inst'allation  : of.'a LPt.1S ih the? event'ttiis idatter -

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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

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Washiniton, D. C. 20036 j

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, e Roge? M.iLeed, ' Esq.

JSchrohter'," Jackson, Goldraark -

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' Seattle,tWashington .9810] i

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-Richard-M.'Sandvik, Esq. - ,

Assistant Attorney General ,

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State' ~of' Oregon'.

~}' Department'ofJustice 1133:S.'W..Harket Street Portland, Oregon 97201

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.Mr!Lloyd.'N.[Marbet ,

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

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