ML19246A292

For Comment Issue of Reg Guide 1.9,Revision 1, Selection, Design & Qualification of Diesel-Generator Units Used as Onsite Electric Power Sys at Nuclear Power Plants

ML19246A292
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Issue date:	11/30/1978
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
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ML19246A293	List: ML19246A292
References
REGGD-01.009, REGGD-1.009, NUDOCS 7812070270
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Text

Revision 1*

1. • x U.S. NUCLEAR REGULATORY COMMISSION November 1978 e

8 (sM REGLE ORY GUDE

• eee*

OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.9 SELECTION, DESIGNr AND QUALIFICATION OF DIESEL-GENERATOR UNITS USED AS ONSITE ELECTRIC POWER SYSTEMS AT NUCLEAR POWER PLANTS B DISCUSSION A.

INTRODUCTION (ieneral Design Criterlun 17 " Elec t ric Power A dimel-generator unit sel"cted for us" in an Sy st, m s.

cf Appt ndix A.

"G"neral Dewa oasite electric power system sh ;u! I h tve the Crite ru f. r N uclear Power Plat s.

10 (?H capaluhty to il) start and accelerate a number Part ie. "Do o stic lacensmg.4 Productisn and of hrge mot.>r loads in rapid succession and be requirement able to sustam the lo s s of all or any pa rt of l'tih uti n Fteihtic' includes a that the i n.,i t e elec t ric p'.w c r system have such I uds and maint.un voltage and frequency su f f um n t capacit y and ca p.d a ht y to ensure within acceptable hr.uts and (2) supply power that (1) specifwd acceptable

-1 design hmits

c. n tin uou sly to the equipment needed tu ma in -

ola n t tain the plant in a safe condition if an ext-nded an i design co n dit io n s of the r"ut"r i

pretsure 1"undary are nid "xceedml as a low i.f < fi sit e powe r cccu rs result of anticip ett J 1 erati.:n d r <currenc and ( 2) the cort is celed and c' nt.unm-nt m-IEEE Std 387-1977, "JEEE Standard ('riteria tegrity an i oth-vital function: are m ontamed for Diese 1-GeneraLr Units Apphed as Standby in the event of p stulated accid"nts Power Supplies for Nuclear Powe r Gt neratmg S t a t ion s, " ' ddineat es principal design criteria Critero n Ill, " Design Con t re 1.

of Appen-and qua!ification testmg requirement s that-if dix H. "Quahty Assurance ('rit e ru f.,r N uch a r followed. wul help ensure that selected diesel-Power Plants and Fuel Repr1,ce: smg Plants to generator units meet their perfo rmance and 10 CFR Part W melude a requirement that rebbihty requirement s.

IEEE Std 387-1977 was measure: Le provided for verifymg < r checkmg developed by Mrkmg Group 1. 2 C of the the aJequacy

<.f design b) d" gn reviews, by Nudear Power Engtrecrmg Committer (NPEC) the use of alternative or simphfied calculatunal of the Institute of Electrical and Elec t ronic s met h. e

'r by the perf. rmance < f a 'ultable En gmee rs. Inc (IEEE ). apprwed by NPEC and sulcequently approved by the IEEE Stan-restin g pri > gram.

dards h ard on September 9. 1976. IEEE Std Dwsel-generator unit s hm been widely used 387-1977 is supplementary to IEEE Std 308-as the power sou rce f<.r the 4.nute electric 1 % 1.

"!EEE Standard Criteria for Cla s s IE power s ystem s This re gula t o ry guide de-Power Systems and Nuclear Power Generatmg method acceptable t>

the NHt' staff S t a t ic n s. " 1 and specifically amphfies paragraph scribes a w it h the Cemissu n : re q uire-5 2 4. " Standby Power Supplies, of that duc-for complymg

<hesel-gen"ratar urm, ' intended for ument with respect to the apphcation of dwsel-ments it it use as n sit e p;we-sources m nur 1"ar power generati r u nit s IEEE Std 308-1974 is en-plan t s be select"d with suffident c ap eit ' and durae i. w:th certam exceptions. by Hegulatm y be quahf mi for t.his service.

Guide 1.C.

" C rit e ria for S af e t y - Hela t e. !

Elec t ric P.w er Systems for N u clea r Pow

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the sel"ction of a diesel-generator unit that is generate unit so that it exceeds the z um of able ti anept large loa d s in apid succession the loads needed at any one tuu A m :re aceu-The map rity of the emergen Lad 3 are large rate e strate of safety luads is po ssible durmg m lucti,n motors This type of tutor draw s, at the operating license stage of review because f ull v,ltage a starting current five to ten det aile J designs have beca < m @ ted and t.m e r its rated Ivad current. The sudden large p reopt rationM int data are a v aila ble. This increases in cu rrec t drawn fr: m the diesel p rtuts the c< 'n s id-ra t ion of a 3< > mew hat le s s generat >r resultmg Jrem the startup < f owuc-ci nservative approach, such as uperat on with t i< > n m t <,rs can result m substantial voltage safety loads wit hin t h" s hor t - t ira, r:itin g i,f t he reduc t ion s The b,wer volta;;;e c >uld I revent a diesel-generater unit motor f riim st arting, i e. accel"ratmg its load to rated speed in the required time or cause a C.

REGULATORY POSITION runnmg rm. t o r to coast down or stall ot h e. r loa d s might be lost if their ci nt actors drop O >r fo rmance with the require ment s of IEEF out.

Rec < w ry fn.m the tran rnt caused by Std M 7-1977

"!EEE Standar d

('riteru for rat a U nit s Apphed am Standby st a rt in g lar o motort or from th" lo s s if i Olesel-Gene large 1.ad c< uld cause ihe elengme overspeed Nwer Supph.

for Nuclear Power G en e r a t in g which. if act 'sive might result m a trip <:f Satic n s dated June 17. If 7, is acceptab!c the engm" These see consequences can als, f' r

m. et m g the requirements

.,f th-principal re, ult fr o the cumulative effect of a sequence d nign crit"ru and qua hfi cat ion tntmg of of more roderat e transients J the syste% is not diesel-gene "ator unit > used as

.n a t e ( h ct ric permitted to r ecover sufficiently betwe en suc-oower systems fo nuclear power I lants subject cessive ste ps m a loading sequt nce.

to the f sllamg:

(;en e rally it has been mdustry p ra c t ice to 1 When the c h a rac t e ris t ic s of loads a. e not specify a maxtmum vr:ltage reduction of 10 to 15 accurately known, such as durmg the con-perce nt whe n startmg large motors f rom large-structicn permit stage of design, + ach diesel-capacity powe r sys te ms and a voltage reducton generator unit cf an <,n site power supply of 20 to m percent w hen start mg th"se motors system should be selected to have a o attnur'us from lumted-capacity power vur< es such as Irad ratmg ( as a f med in Sei twn 3.7.1 of IEEE diesel-ge:ncrat or unit s. 1.arge induction motors Std 3M7-1977) equal to or greater than the sum can at hieve rated speed m less than b seconds of the ec nservatively estimated loads needed to when powertd from adequately sized diesel-Le powered by that unit at any one t im " In generator unit > that are capable of restormg the absence of fully substantiated performance the " ult a ge to M percent of nominal in about I characteristics for mechanical e quipment such second as pumps, the elec t ric motor d rive ratin gs should b"

calculated using conservative esti-Protection of Hie diesel-generator unit from mates < ;f these ch a ract eristics, eg pump ex ces sive overspeed, which can re s ult from a runout conditions and motor efficiencies of it; lo > of load, is afforded by the immediat e oper-or les '

ation of a diesel-generator unit trip u sually set at 115 pecent cf nominal speed. In addi-J.

At the operating license stage of review,

twn. the generator differential trip must over-the predicted loads should not exceed the ate immediately m order to prevent substantial shert-time ratmg (as defined in Section 3,7.2 damage to th-generator. There are other pro-of IEEE Std 387-1977) of the diesel-generator tective trips p rovided to protect the diesel-unit.

generator units fr,m possible d: image or degra-dat ion. liowever, these t rip s could interfere 3.

During preoperational t es tin g, the pre-wit h the successful functionmg of the unit dicted loads should be verified by tests.

when it is most needed, i.e.

durmg accident con dit ion s. Experience has shown that there 4.

In Section 5.1.1,

" General,' of IEEE Std have been numerous occasions when these trips

'37-1977, the requirements of IEEE Std 305-have needlessly shut down die sel-g e n e ra to r 1974 should be used subject to the regulatory units because of spurious operation of a t rip position of Regulatory Guide 1.32.

circuit. Con seq uen tly, it is im po r t a n t thu measures be taken to ensure that spurious ac-5.

Secti0n 5.1 2 " Mechanical and E!"ctrical tuatwn of these other protective trips does not Capabihties, of IEEE Std 387-1977 shouhi be p revent the diesel-generator unit from supplemented with the following:

performing its function.

"Each diesel-generato. unit should be capa-The uncertainties inheren t in es timat es of ble of startmg and accelera ting to rated safety loads at the construction p ermit stage of speed, m the required seq uence. all the design are ometimes of such magnitude that it needed engmeered safety feature and emer-is ;>rudent

'o p rovide a substantial margm in gency shutd awn loads. At no time durmg the selecting the loa d ca pa t>ilitie s of the.hesel-loadmg sequence should the frequency and generator unit This margin can be provided voltage decrease to less than 95 percent of by e s tim a t in g the loa d s cur serva tively and niimmal and 75 percent of nominal, respe r-selectmg the continuous ratmg of the diesel-tive ly. Frequency should be re s t o re d to 142 274

within / psttrot c, f n

• dn al, and voltage ccnditions The design of the bypass sw should be restored to wit h m 10 percent of tircuitry should satisfy the requiremen's nomin al within 60 percent of each l',d-of IEEE Std 27'3-1971 at the d msel-sequence t ime m t e rv al. ( A greater perce nt-gener ator system 1( vel and should melude the capabihty f..r (1) testing the age of the time interval nay be used if it can he justified by analysis Hawever, the load-status and < >perabiht y

<f the bypass sequence tune interval shi-uhl melude s u f fi-circuit s. (?) ilarmmg in the control reum cient margin to acwunt fi r the accuracy and abnorwd values of au byp is param-cepeatabihty r,f the loa d-seq ue nce tir er )

eter3, and (3) manually resettug of the Du rin g recovery from transwnts caused by trip t2ypass f unc tion. Ka pabiht y for step lo.nl mcreases or re s ult in g f r< n the autumth ret is n 't accept aMe F disconnecten of the largest sin gle

'.J.

the speed of the diesel-generator unit should not

9. Secti.n 5. 6. 3.1, "Surv< illan ce S y u em

.f e m ed the n-car al spe+d plt.s 75 pert ent,f IEEE Std N-1977 should ta supph mente d w:th the.hf fe re nc. L tween nommal speed and the the fellowing o v e r s p e 1,1 t rip setpomt or 115 perccnt of "in order to f u ihtatt t routb diagnosis the ni ' mal, whwhever is lo w e r. F a rthe r, the s urve tllance s y s t em should mdw de w hich <.f the dud-g"E+ m protective trips is ac t i-trangent f oll<, w m g the c<.m p le t e lo s s of luad shouot not cause the sp+ ed of the unit tu vmd fnt at t.un t he overspeed t rip set;-int.

10 in Secti.,n 6 3. ' Type Quahfication Test-u ti na i. "yu a hf;

'm.

if IEEE tng Procedures and Methods. of IEEE Std a7-L In Std M -luT7 the quahfication t< - :mg require-13"7 the requiremenb of IEEE Std 3 H-l'373, m nts vf IEEE Std 3M-1371 "IEEE St indard for "Recinmended Practices for Setsmis Quahfica-Quahrymc nas IE Equy;me r

• f"r N ucle ir ti< n < f Class lE Equipment for Nuclear Power P- -w c r Gi wratmg Stato ns." 2 should be used Ger ' rating S t ati,n s, fer si tsmic an aly < ', or

ub; ct t<

the regulat, ry p isit o.n of li+ gulat ory seomic testmq by equi;: ment manuf act urer3

(;utJ-I w.

Nu ahf u ation f Chs IE Equ p-should be used

,u bjec t to the reguhtury post-tion of Replatory Guide 1.100. " S e mra q u a h-ment f, >r N ui ar Po wer Plac.t s ficati m of Electric Equipment fvr N uclear secti n 5 i " Design and Apphcat t. n Con-Power Plants si!"ran >ns,

.f IEEE Std M -1977 should be

11. The 0; > t io n indwatrJ by "may' m dec-suppb m nted with the f @ wmg.

tion G. 3. 2( 5 H c ) of IEEE Std M 7-1377 should thewl, e nerator untt s should b+

& signed to be treated as a requ.rement to testaMe du rm g,, c ration of the nuclear p wcr I lud as well as whde the plant is shut 12 Secti: >n 6 5, mit e Acceptance Te s t in g,

d. >w n The design sh uld includ-provisi<.ns and Secton 6.b,

" Pert > die Tes t mg,

<.f IEEE that the testmg of the u nit s will simulate Std 387-1977 should be supplemented by Regu-the para mt"rs of op ration (outhned in htury Guide 1.108.

eriodw Testmg cf Regulat. ry Guide 1. IM.

P I ne s M ;e n e ra t or Umts Used as Onsite 13.

Section 4.

" Ref erence S tandards,

of Electric Powcr Systems at N uclea r Po w e r IEEE Std 387-1977 hsts additional apphcable Plan t s ' ) that would be expreted if actual IEEE sta n da rd s.

'I h e s pecific appbcabihty or acceptabihty of these referenced standards has dmand were to be placed on the system.

been or wid be covered separately m other Ee,i Athty shou!d be considered in the regulatory gunfes. where apprupriate.

sel"cmn and 1; cation of mstrumentation sen-D.

IMP LEM ENT ATION sors and critical s omponents (e g go v e r-ni r, startmg s y s t em component s ), and the overaH design should -nclude status mdica-This p rc pos ed guide has been release d to tien and ala rm features.

in s t rumen t at e.n encourage pubbe participetton in its d"v e lop -

se n s,r-sh..uld be readdy accessible and ment. Except in thme cases in which an apph-that their mspection and cahbra-cant proposes an acceptable alternative method designed o

for complymq with specified po rt io n s of the to ' c.m be ve rified m place Commission's regula tions, the methud to be 8 Sectwn b 6.2 2,

' Automatic Control,' of described m the active guide refl"ctmg pubh IEEE Std M7-1977 should be supplemented with commen t s wdl be used in the e v alu a tion of the f Awmg apphcations far construction permits dc.cketed af ter the tmplementation date to be specified in

.3) Tith the exception of the engme ever-the active guide. This tmplement atr n date wd]

m no case be earber than July 1979.

speed trip and the generator differential trip, all diesel-generator protective trips should be either (1) implemented with If an appbc ant wishes to use thn draf t gui k two or more indepen dent measurements m an appbcata n docketed priar tc the

4 w-for each trip parameter with coincident mentation date, the pertinent p< rti e

..f the logic provisions for trip actuatian or (2) a pp heat tun wdl to evaluated on the bas.

of automatically bypassed d u rm g ac cide: n t this draf t g W

' 42 275 1 9-3