ML19221A920

Reg Guide 1.102,Revision 1, Flood Protection for Nuclear Power Plants

ML19221A920
Person / Time
Issue date:	09/30/1976
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
To:
References
REGGD-01.102, REGGD-1.102, NUDOCS 7907100372
Download: ML19221A920 (5)

Text

.N.

v Revision 1 U.S. NUCLEAR REGULATORY COMMISSION September 1976 REGT CORYG' DE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.102 FLOOD PROTECTION FOR NUCLEAR POWER PLANTS A. INTRODUCTION induced Goods and water waves take into consideration the results of geologic and seismic investigations and that General Desmn Cntenon 2, "Desig.i Bases for Protec-these design bases be taken into account m the design of two Agamst Natural Phe n ome na,'

of Appendix A, the nuclear power plant.

" General Deugn Critena for Nuclear Power Plants," to 10 CFR Part 50, "Licensmg of Production and l'tih7a-Regulatory Guide 1.59, " Design Basis Floods for tion Facihties requires that structures, sy stems, and Nuclear Power Plants," desenbes acceptable methods of components important to safety be desipied to with-deternuning the design basis flood conditions that stand the etrects of natural phenomena such as Goods.

nuclear power plants located on sites along streams must tsunanu. and seiches withou t loss of capability to withstand without loss of safety-related functions. It perform their safety functions. Cnterton 2 also requires aise discusses the phenomena producing comparable that the desien bases for these structures, systems, and design basis Goods for coastal, estuary, and Great Lakes components redect sites. The guide states that examples of the type of Good protection to be provided for nuclear power plants will be the subject of a separate regubtory guide.

1. Appropnate conside ra tion of the most seve re natural phenomena that hase been lustorically reported for the site and surroundmg repon, with suf0cient This guide desenbes ry pes of Good protection accept-ma rgm f or the knuted accuracy and quantity of the able to the NRC staff for the safety related structutes, histancal data and the penod of time in which the data systems, and components identified in Regulatory Guide have been accumulated,

1. 29.

• In addition, tius guide describes acceptable

2. Appropnate combmations of the e!!ects of normal

• Regulatory Guide 1.29. " Seismic Deugn Clmfhanan,"idenn-and accident conditions with the ef fects of the naturaj fies stnatures, sy stems. and comronents of bcht-w ater-cooled nde p wer plants that shouid be designed to withstand the phenomena, Jnd ef fects of the Safe Shutdown i arthquake and remam func-tienat These structures. sy stems, and components are thow

.t lhe importance of the safets functions to be necessar> to ensure t l) the integnty of the reacter toolant per formed P! essure boundary, (2) the capabihty to shut daw n the reactor and mamtam it in a safe shutdown condition. or (31the caraibu to present or nunoie the consequentes of auidents ParJgraph 100.HAc) of 10 CFR Part 100, " Reactor that could result in potennal offsue esposures comparable to Site (,ntertaf requires that phy sical characteristics of the guidebne esposures of 10 Cl R Part 100. These structures.

the site, mcludmg seismolop. meteorology, geology, systems, and components should also be designed to withstand and hydrology, be taken mio account in determmmg the cond'nons resulong trom the design t asis Ikod and remain functional acteptabihty of a site for a nuclear power reactor, it is espected that sa fe t y -rela'ed st ru ct u re s, sy uem s, and Appenshx A. "Selsnuc and Geohigic Siting Criteria components of other ty pes of nuclear power plants will be for Nuclear Pow e r Plan t sf to 10 CFR Part 100 idennfied in futun regu atory guides. In the interim. Regula-tory Guide t.29 should be used.s guidance w hen identit> me identities the Ins e stigJ ! ions neLessary for a detaded saf et)-related strut turn, s> stems. and (omponents of other stuJ3 of seismically induced floods and w ater wases t> pes of nutear row er riants that need to be rr"te ted trom f he appendis requires that design bases f or scismically fl%d s b y methods suth as those suggeded n thn guide i 9/

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w methods of profet ting nusle..r power plants triim the Methods ut flood protecnon f or nutlear power plants effects of Probable Maxnnum Precipitation (l'MP) t Ahng fall mto one of the f ollowmg three npes(losal flooding directly on the si!c.*

induced by severe local precipitanon wdl be discussed later):

B. DISCUSSION

1. Dry Site Nutlear power plant structuies, sy stt na and tom.

ponents im por t an t to safety should be designed to The plant is budt above the DBFL, and therefore withstand without low of tapabihty to pertonn their safety-related struc tures, sy stems, and components are safety lunc nons, the most sesere flood conditions that not allected by floodmg.

tan reasonabis he pmtulateu to a t ur at a site as a result t il ses c ie hs d r i q nc teiin ili mjc al t < in ditn >n s seNnk Jc-tivity, or bmh 'l he flood prolet tion teatures necessary

2. Exterior Harrier to protect the saleterelated structuret e stems. and components Inudd be deuened f or the raage of precipi-Saf ety -related strut tures. sprems. and components tJllon. wind. an d se nmicallV induced thel c onditions are protected from inundation and static and dysunut identihed it Reenlatory Gmde I so (he w ater mduced forces thereof by engineered features external to the ettects, both stata and dynanuc. on toe flood pretettion immediate plant area. Such features may, when properls

[eJtuIes Jrc con <ldered to iainstitute normJI UIRlron-dest (nCd and maintamed, produce the etpuvalent of J mental f ortes f or use m the design of such features The dry site, although care must be IAen to ensure that forces are deseloped f rom the hydrohipc engmeenng safety-related structures, equipment, and components analysis of the flood conditions are not adversely af fected by the differential hydrauhc head.

For purposes of this gmde, the I)esign Bais i loodme Level (1)BFI ) n dermed as the maximum water eleva 1 incorp r ted Harrier tion attamed by the controlhng flood. meludine t omco dent wmd+enerated wne eticu ts l he u md generated Safety-related stmetures, systems and components une component of elevation is eencralls controlled bs an' protected from mundation and static and dynanuc letch and water depth and may ditter at lot ation s Mu ts h enpneced featu rn in tM u m c t u n'/

around the plant Further distmetion must be made ene nment intnfaa hetween estimates of " structural" ef fects O.e.. stane and dsnanue forces) and floodmg or inundation ettects.

Regul itory Poution 2 of. Regulatory Gmde I su Additionally, the controlhng flood event may be ihiter.

provides that tiu a structures. sy stems, and components ent for evaluanne structural efic< ts than for es alualmg

" " " "d') I"r safe shutdown and mamtenante thereol mundation elfet tt I or cumple, the Probable Maummn should be protected against the 1)BI L T he poutmn also I lood (PMF) mn produce the highest water lesel and summ that, it sumen'nt waanng tune n enwn to be stanc lortes on a gnen structure, but the total static und audable to hnng the plant to a safe shutdow n con;h-dy nanuc f orces on th strucNrc may be greater dunne i smaller On c!cution) flood w ne f rom the sennuellls tion, some of the other safety-related structuret s.s-tems, and components identined m Regulatory Gmde mduced fadure of.m upstream dam.

! 29 tb ) rH)I requiIe protection against a floted as Wsere the 1)BFL N of tlus nicthod of protes non as an as l'or structural purposet the snauncani w ne heicht n acceptable alternatise requires development of emer-used. for m un da non t onudera non s ibe otw pe rc e n t wase height is used. Significant wmc hcicht til ) is the gency protedures anJ techmcal speafications. Substanto Jnon of be JdequJg of the tune nailable w dl reqmre.

average of the luehest one thirJ of wind-cenerned waves

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m a 'representaine spectrum Uncfero nt warc height (Il ), sometunes erroneously called the nuwnmn warc i

height, is the n erage of the lughest I pe rs e n t ot w nd gent rated wacs in a representaine spectrum ( Ne

1. f stimJtmg the tin e required to bnng the plant of the relat on ll i - l 67ti is.uteptaNe f or deternun-I'"m tuRpown operation to a ute shutdown mode s

ing the one percent wne height.

2. I stabl shine the warnmg indicators that will initi.

i atti shutdow n proseduret Flood stage and rate of rne

'Sugested (ritcru for the eunuderation of loc.dued severe pr cipitation are contamed m Section 2.4 2.3 of Regulatory are c ommon and generally acceptable indh atort flow -

G u kle 1.70 "S t and ard I ormat and Content of Safety ever, sites along streams downstream f rom the conllu-Analysis Reports for Nuclear Power Plants." ne detimuon of ence of major (nbutanes may require an.nscument of Probable stasimum Precipitation is contamed in Remir.ory Guide 1.59 Goodmg potential f rom floods that are less lh.m the

" Lines indicate suhtar.3e c hanges from previous inue.

PMI. but could exhibit laster rates of nse than the PMI e

' ' "2 '

126 137

3. Documentmg that sutticient time wil: remam Lfter impact of the design wave. The seawall dusipates wase the warnmg for the safe shutdown to be accomphshed energy by thros mg the water upward and downward.

The upward deflec* ion may result m wmd-blown over-helore water can flood any safety-related structures.

toppmg. the downward deflection can cause severe systems or components, erosion at the toe of the set wall lhe regulatory positions of this pude identify several (3) Bulkhead. Simar to a seawall. I he pnme to be considered m deselopmg acceptable purpose is to restram the land area. A bulkhead should key itend flood-related emergency procedures.

be used where it may be subject to direct wave not anxk.

I ocal PMP may produce floodmg at sites otherwoe considered unmune from Goodmg. The miensity of flus W Revelment. "A facmg of stone, cencrete.

etc., bmit to protect a scarp, embankment, or shore ramfall and the usual design of the dramage sutem may result in pondmg m the plant yard that could produce structure against crosien b3 wave action or currents "*

the DBFL. Also, roofs may receive more precipitation Revetments are alternatnes to seawalls and bulkheads.

than the root drams are designed to ducharge.

They protect the shore from direct wave attack by absorbing the wase energy m their mterstices md on the I:inal plant grading is usually designed to cause surface of the revetment matenal. In this rega d. nprap ponded water to flow away from utety related build.

n more ef fectne than smoother surf aces. Wase iunup on in gs. 1 ven so. some temporarv pondmg is to be the revetment is a functwn of incident w ave height, expected. Such pondmg is genera!h accommodated by reselment slope, and the nature of the icutment loc atm g pene tr ations above the level of temporary matenal Rough surfaces reduce runup. When nprap is pon dm g.

Plant structures. sy stems, and components of the matenal is entic d to the used, the placement subjec t to pondmg are also subject to the static and effectiveness of the feature. Filhng of the interstaes dynamic forces of the ponded water. These forces are

• ' th fmer matenal destroys much of the energy-usually less, however, than the forces f rom other design absorbing capabihties of the installation and niav rcuit m overtoppmg a strutture that is otherwne adequate to basis events.

prevent such overtoppmg.

C. REGULATORY POSITION W Breakwater "A

structure protec tmg a

1. Ihe f ollowing paragraphs provide workmg defim.

shore area harbor, anchorage or basin f rom waves 7 tions of the vanous types of flood protection acceptable Hreakwaters may be connected to the shore or mn be to the NRC staf f.

h)cated entirely of fshore. Wave energy n dissipated m the same manner as it is by re s e t me n t s Ol f sh ore

a. Dry Site breakwaters are used principal ly to reduce the wave effects that might otherwise reach safety-related struc-The dry site may be the result of natural terrani tures, f acihties, or components. Shoresonnet ted htcak-or it nuv he constructed usmg engmeered hil. The latter waters may serve the same purpose and also mn be used ty pe ref ers to the " plant nian 1" concept. rather than the to tram discharge or mtake water llow paths to hnut nunor till used to dres, plant grade % hen tillis required

'ecirculatwn to raise the plant access level ahose design basis flood conditions. the fill n safe ty related and must be

c. Incorporated Harriers protected f rom flood ettetts m the same manner as saf ety -related dams dikes. ete Protection is provided by special design of walls Walls a e usually remtorted and penetration dosures r

b. Exterior Harriers concrete designed to resist the statis and ds nannt ti rces of the DBFl. and incorporate spe ul water +ps at

( 1 ) /. cree. 3 dike or embankment to protect construction ;omts to prevent udeakace. Penetr anons i mJ 1 rom mundatmn."* Lesec, are generally earthen mclude personnel access. eqmpm nt attess. and through-strus tu res. t raremid d m t ross set non. and protected Pipe penetranons are usualh scaled with

• 3ll P' ping Irom erosion by armor on the late exposed to wases and curreni j

( cnter "sh-re Protet trn st.inu al. A mnun lonu m.Iro

(.' l.Sedwa// i tr / [i 9 h/h J// ' A structure separJi-me land and w ater areas. puman desitned to present g g g, g,,m u 2 2nm (cs nm N.d e J In m @

e rosn in and other da mage due to w as e ac tion.'

• Su;,eontendeni of Dmonent t l's Wernmem "omme or raw alls are m.nsn e structures Jegned to take the full h.c h tun e n. O C 2 W o2 9

126 B8 I 102 4

special rubber boot s and Ibmes Penonnel access selected warmng mdicator_

he procedu res hould c losmes that h.ac been f ound aueptable mthnle sub-consider the total DBFL however, the ind. calms (usu-meme doors and hahhes lhe hydraulk and sennue ally flood stage and rate of nse) should be based on the design bases f or all ty pes of tiosures, mtluding w ater-stdlwater lesel (i.e.,

DBFL less w md-cenerated w ave stops, boots. and llanges, are the same as for the wall ef fects). T his precludes the maskmg of Hood potential ti e, w ater tightneu and resistance to static and ds nama by less than design basis wmd at the time of observation forcest in addition. the doors shotdd open outward to ensure closure il the door is madsertently opened dunng d A commumcation system should be estabbshed the nood event Additionally. the plant should be to alert both onsite and ofhite compans personnel of desiened and o;,erated to Leep doors necessary f or tiood flood conditions that may require subsequent shu t-protec tioti t h) sed durnis rnirm d i'peTalnin. PCH0f ratn>ns dowrl of thC plan t. Sulh a s) slem mJ) use olisite thal IIe too large to close with a single door (c g.,

facihties and sersices. such as upstream nyer gages and c<pnpment and f uel loadmg access) generally requue Good forecastmg services. as well as ducct commumca.

stop logs or llood panels f or <losure. T he design bases tion between onsite and offsite company personnel flir these teJtures arc illc same as abtise, as a the need tL1 mamtam then, normall: m a closed postoon.

e. The procedures in 2.c should specify that onsite plant personnel wdl initiate a sale shutdown on then Temporary llood barners tuch as sandbags, own vohtmn when the lmutmg values of the indaators plastic shecting, portable panels, etc.. which must be are attamed. Only those warnmg systems located at lhe instahed pra r to the advent of the DBFL are not si t and under control of plant personnel should be acceptable for issuance of a construction permit. Ilow.

needed to deternune the knutny salues of the mdwa.

tors.

ever, unusud cucumstances could arise after construe.

tion that would warrant consideration of such barners.

One example of unusual circumstances that might justify

3. Analysis supporting the invulnerabihty of safety-use of temporary barners is a post-construction change related structures, sy stems, and components f rom the in the Good produemg charactenstics of the drainage effects of local PMP should be perf ormed oug the pomt rainfall value of the PMP for the site area.

area, as discussed m Regulatory Position 3 of Regulatory Guide 1.59, " Design Basis Floods for Nuclear Power Plants." In such circumstances, and with strong justifica.

a. Regulatory Guide 1.50 proudes guidance on tion, the staff may accept temporary barriers.

obtammg PMP esumates. An analy sis of the estunated aepth of pondmg m the plant area should also be made

2. Past experience suggests the need for guiJance in h Roofs are usualls prouded with drains des:eneJ estahhslung the shu tdow n tahmcal sr. attinons or in discharge precipitation mtensines t onside r ably lew pro edures netchar) to u n hie cmergency opeur m c

Regulatory Poution 2 of Regulatory Gmde 1. 4 Ihe than that of the PMP. The folh ew mg me t h ods of following should he used in estabbshmg the nes ewan presentmg undesuable bu:ldup of standmg water on the prot e d u re s _

roob of safety related huddmps base been lound accept.

able to the NRC staff;

a. Stae - (clo inon bnme relanons should H desel-ered u sm g the appmpn a te lh ed hsd.ograph awah (I) The parapets (a common architectu al lea-conhident w md-cenc ra ted w as e e nec t s t anil de th.u -

iure of nuclear power plant structures) may be leletcJ actenstics. Rner utes dow nstream f rom the c on!!uense on one or more sides of the buildmg llus a <he most of matt'r trlhutaries ina) reglu re JWssnleril ' d O ' b H'd Commiin method.

potentiel IIin lew sese re il(Hid events that mas Cxhibil faster rates of use than the PMI (2) The parapet heigh t may be hnuteJ in

b. ~I be flood st aee. mchidine desicn bw wmd pr uJe budduo of water m excess of the structma!

apa ny of the roof fo: design loads.

ella ik and 'he tune of ou u r ren< e pencratcJ w as e withm the ilood es ent at whth any saHn, related st rlk t ure, ss stent. * 'r t ompi rien t ( 3N dClinC d ul N0gn!a'

{33 $ cuppers may he in,IJiie d through the i

tory GuiJe 1.20) re bet ome degrada! or m"Peratne parapets to distharge the standmg water over the edge of sht$tdd estah!all l

s t'mpleln'n ti!nc ti'l J!I si'llidow n the hu;] ding proce da res

c. I' stim ites t 't the time Iet{uir 'd t'8r Mle shut (Ntite thJl hmitmg the parapet licight t the dow n should he bned oo.ncoce ather than b st tun" scupper to. Ior example, o mehes above the roof wdi not operator pertorru m.

I hn tune mien.d de JJ ' :ess necessanly knut the depth of water on the root to o than the tii'le f or e st urrence s'l' the esent in RCgJ t a t o rs insbes. ('iinnder.ition should be gnen to the hs drauht Position 2.b to estabbsh the limitmg values of the head netessars to minate flow )

h 1.102-4

Ihe bud mduced by the maxhnum depth of I his gui '- miects current NRC staf f practice. There-f standmg water on the roots (inJudmg antecedent or fore, except in those cases in which the hcense apphcant c.

itomddt ot snow or tcel dunng the design basis esent or hcensee pro;mses an acceptable alternanve method should he less than the structural tapaaty of the roof for complymg with specitied portions of the Conums-for design lo. ids, and the discharge capaaty of roof ston's regulations, the method desenbed herem is bemp drams should be compared with the design basis dis-and will continue to be use.1 m the esahunon of subnuttals for operating beene or tonstruction pernor tharge.

apphcations antil this guide is reuwd as a result of suggestions f rom the puhhc or adibrional stall reuew D. IMPLEMENT ATION T he purpose of this section n to proside information to buense appheants and hcensees regardmg the NRC stall's plans f or using tlus regulatory guide.

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