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Forwards Responses to NRC 770318 Request for Info Re Selected Technical Issues for Vendor Participation Published in NUREG-0138 & NUREG-0153,per 770822 Ltr
	ML20024C743
Person / Time
Site:	Three Mile Island
Issue date:	07/28/1978
From:	Taylor J; BABCOCK & WILCOX CO.
To:	Mazetis G; Office of Nuclear Reactor Regulation
References
	TASK-07, TASK-7, TASK-GB GPU-0494, GPU-494, NUDOCS 8307130203
	Download: ML20024C743 (13)
	v • d • e

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y c:; mis' Babecci(rM!cox %. m , , . . en - maemtana,u s.=sessa Team,e moe m u s h * ~. [ July 28, 1978 *

b Mr. 8. E Masetts . Reacter Systems Branch . Divistem of Systems safety . .. Office of Nuclear Reactor Asgulaties-

E S. Nucigar Regulatory Ceanissica

                          .'.                                                        Washington, D.C.                          20535                                                                                                       .

I Seferencess (1) Letter and Inclosure 5. F. F. Bass. Jr., NRC, to E. E. Suhrke. 34W, March 18. 1977, subject Technical issues for Vender Partietsattoa . j . (2) Letter, James L Taylor, 34W. to C. E.Hazetis, ' l- .. NBC, Angust 22, 1977, same subject

Dear Mr Nasetis:

Raclased are three (3) copies of our responses to 'the so selected technical issues published in NU21G.0128 and NORIG-0133, requested by your letter of March 18, 1977 (Beforence 1). These responses are in accordance with our 3] 1stter of August 22, 1877 (Reference 2). '

                         !;                                                                     If you have ear further questions conceratag this matter.-

lj , plasse contact Mr. William R. Speight (1st. 2SO2)'ei y taff.,..

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                                                                                                                                                    , Very     Ln truly yoursiyr                           . - - .

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                        .3                                                                                                                              James N. Tay1
                        ..                                                                                    ,.                                        Nasager, Licensing                                            ..                   .

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i (. q in asNURgf. back 0134 La regards to the use of sea. safety grade equipment s. g n' g *

                                                            .                                                 to safe co onents during a staan-Line break. ' The                                                                                                                         g number e issues ra sed y secondary.systes transients is large                                                                                                                                               L

t. and ceaplex enough, that a systematic approach to all secondary

                                 ;                                                    treasient issues should be undertshes. Therefore, in lieu of
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reiterattar the analysis assumptions currenti in recent SAR sub-

                            .,                                                        mittals. SW proposed a series of meetin a vi the Ceanission                                                                                                                           ,

1eading towards final resolution of the asues involved with , . l 5f .s - secondary system induced trsasiests.

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1s,s,3g,J,,a Delaved less of Offstte Power Pe11ewiar a LOCA* I l tU * . . , , A. Offsite power remains available following a LOCA: the ' 8

diesels start; at seas time after the LOCA effsite power It %* sg is interrupted; critical lead 2 are interrupted for a -

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short time until sequessed en to the diesels. .

3. Offsite power reaalas available followier a LOCA: the *

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diesels starts at some time after the LOCA and the ECC5'

. signal is reset offsite 9 * ** aketdeum leads (met ECCS)are power sequencedis laterrupted, sa (the safe '.

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I' diesels any mise have been stepped, is which case:ther will have to be restarted). *

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This 1sses raises the sencets that the less of offsite power at

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                                                                                           $                           sees time follow                               a LOCA would result in auch more severe de*                                        .

esasequences than i effsite power were test sensurrent'with the t' ! **. ** . LOCA transient. A study was performed to assess the nazimum I' - *"*..*.s est of a less of offsite power (LOOP) at say time fellowing 9 LOCA. A minor increase as peak claddiar temperature was ebtained: however, due to the sufficiently Iow probability for

                                                                    . .,                                               this assurrease. 34w fests that it is met necessary to consider g;                                     .

1007 subsequent to the LOCA. ,,,,- ,

pellowing the LOCA. the ISPAS signals will actuate the* diesels, and will attala rated voltage"and speed withia 10 sesseds.

                                                                        .                                              If offs te power is them.last at seas time after the LOCA.                                                                               ..'

M automatic sequencing features are provided se that interrupted ECCS flew '.e the core is fally re-established withia 20 seesada. Per BEN's plaats, the ESPAS signal is act required to be reset. j* Thus, part 3 et this issue is met to be~ addressed. l l Am. t of a eaded LOOP t* afteranalysis a LOCA.has Thebeenworstperforand ease break, to assess an 8.5L theftp double

                                                                               ..*                        .           break 'et the piump discharge with a Co

1.0. for SEN's 205 FA plaats was re. analyzed assuming a LO3P at the time the CFT's '

empty (36 seceeds). A delay of le seconds was them assumed before the BCCS flow to the core was fally re established. A

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100P at the time the CFT's empty will yield the naziana tapast en peak sladding temperature for the fellowias reasons

                                                                                                        .                        1. Prior to the time t:se CFT's empty, the laterruptions of-
                                                                                                                     .                        ECCE. flow because of a 100P would be less than 10 seconds g*                                                                                                          des to the continued flew free the CPT's. Thus, the imps weeld be less severe than ti.at analysed.
                         ;                                                                                                        2.         At any time after the CPT's empty, the amount of time

hat ECC3' flow would be interrupted dos to a LOGP
weald be the same as that studied. Newever, for a 1007

                          ,?                                                                                                                  that occurs lates thaa the time the CPT's empty, the j                                                                                                     .             sore geench frams would be higher and the sore decay
                                  ,                                                                                                           heat lower than that analysed. Both of these conditions y
                                                                                                                                          , will result in less-severe ceaseguences than that en=imad.

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il* : - f.i . 3 * *. . [ is lessense to issue 4 (Cent'd)., . The results of the ' analysis showed that the peak cladding j- g temperature Sacreased 70 7 to 2144,,7. ,, ,

It is important to mete that this ame1 7sis was' performed'for '

l ' ." . 34W's 305 FA staats which utilize Mark C (17 x 17) feel. Das to

                                                                                                                                            ,                 a              alty en Mark C refleeding heat transfer esaditions (0.3

tiplier sa the F12 CIA predicted coefficients), the sensequences

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of the LOOP ars highly everestimated. Because of the penalty. . 8 peak sladding temperatures occur,at opprezimately 100 seceeds Ie

                                                                                                  ,                                       ,                   rather than at approvinately 40 seconds as obtained for plaats with Mark 3 (15 x 15) feel. The extended ties to reach the anaimmt cladding temperature after the time the CFT's empty toads
                                                                                       'i-;

to enp*1fy the impact of the LOOF. Realistically q- - that stad?.iag temperatures would increase less tha. n 30 it isF.espected l f-The results of the analysis discussed above obviously seemd the'

I effect of a LOOF subsequent to the LOCA for all Sgv plaats. Ia *

Nl 4 ' addities,is it hshould be meted that the scenarie of events #

                                                                                       'j!                                                                    analysed                                ble imprehable. If the less of offsite poser is t4 :                                                                    a result of a gr perturbaties due to the LOCA, the less shea14
                                                                                      ,. g                                                                    escur within the first few secoats which is the.present analysis method. Thus, this sencess addresses an indey=d==t less ed Pouer.                                _                                                   .             .
                                                                                                      .                                                       The probability of am 1A. ' t less of effsite poser la a

ens neer period, according to WASE.1400, would be about one skaase

                                                                                         -l.i8 la 50.300. The likeltheed of a large LOCA is about ene chasse
                                                                                             ' ;5 e4 la 10.000 per reacter year. Furthermore, the analysis that was
                                                                                                 -                                                            per.

e. formes.e .aa assumes in 20 a stagle is .ma se failure seen, of.on.e. th .diesel,whi.ch to.4 r. is about -ility of - - ~

                                                                                              ;;                                                              this sequence of events is very les e

t* As illustrated for SEN's plaats, the tapact of a LOOP subsequest .

                                                                                              -l                                                              to a LOCA results is only a miner impact sa peak sladding ture and does met endanger the public health. Also, the .,j ii*

ability of the event is estremely low. Thus, the LOOP ,

11 swing a LOCA meed met be seasidsrod for 30f's plaats. j

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j i. Ms Analysis of Postutsted Roseter Caetant Pm Reter

aes:ure incaments

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           'y                                           the situaties of a concurrent i.e. staultaneens locked retor e

and less of offsite power is considered as incredible event. Therefore, the situaties analyzed la response to this issue is a l locked roter event with less of offsite power resulting from *the .~, subsequest rascter. turbine trip. ,

The sequence of events for a tacled*Reter'Transiest with a less-t,. of effsite power as analyzed is gives in Table 1. As can be seen. .

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a cesservative value of ISO millisecents is used for the time between turbine stop valve acties ase less of power to the RC

          .        !               -                    Famps. The systes rosynsee is shown in Figures 1. I and 3 for if\                                                                                                                                                                                       L the mestros power, .systen pressure ar.4 AC flow respectively.

The resultant D(31 ase stad temperature response is skews is

          ,         .                                   Figure 4. As is clearly shows. the less of offsite pewer has a.                                                                                    ,
          =,{                                           segligible result en the peck clad tesysrature. This cesparative lg                                       result holds true for all 34W reacter types, altheagh the -result ef the locked retor transient asy vary depending sa plaat type.
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a. Theprotectionphikesophyemployedbyall11Wplaatsagatast' flew 71 f amena11cs has been the use of a flux-te. flew trip feature.

J. parther protecties agatasc less of pusrs It isisS&W'rprovided by the that posities pump

                      .;                                                               ,    power mesitor status trip functies.these two 373 trip functions adequate
                                                                                          *pestvisted transiests                     and no addittoast protective devices are accessary. Justificaties of this posities is gives is the
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fellowing persgraphs.

                                          '                                                  A simplistic view of as underfrequency transions is to assume a t
                                                         . , ,                               1     to 1 ratie betwesa percent frequency decar and percent fle reducties.

Ig . Therefore, the 1 to 1 ratie assumpties Also,is thecesservative an i4- primary assumed issue has to azist been decayfer the este, discussies whereas.toinfollow. reality, there exists two W. frequency limits to c Weder. Cae is the decay rats for.a sua. ai , tained underfrequency transients the other is a minimum frequency

                     ,.                                          .                            above which sufficient flev exists as prevent CNE fres occurring.

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per aes sustained decay rates that recover to assimal frequencies prior to totalThe frequency fluz.to. flew dec.ty trip below setpoint this ralue, the core is determined by one. remains 3
protected.

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                                                                                       * . two. er four pusy coastdeva depending en whethe j'                       *l ** * " ,   -

pissp somiters, respectively.the plaat is protected against that Thefisw reductie

41 . nised,f the source, l.a.. less of pump (s) er underfrequency.

l 'i e less fluz.to o . flew trip setpoint then deteraiaes the sustsiaed decay

                                                       ..-                                      rate for which protecties is provided and typically ranges fres                                                                        .
                                                                .                               1.6 Et/sec to 1.6 Nt/sec for 34W plaats.                                                               ~

If 1911 et rated power is divided by the flas.ts. flew rette.Ifa 4 conservative this flow is ceaverted flew is established by the 1 to asuch ratie that assumpties no CN1into occurs. a

                              )       *
                                                          .                                     say frequency decay rate that                                                     It is the    recevers.before responsibility                                the is below typical values of 5d to 37 Ns.
                                                                       *                      *ef each applicaat to deseastrate grid stability within this range.

l

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             +
                                                          ~ . . . ,1s,s,y,,1p passive Mechaatcal valve f a r

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                                                             .     .h8                                                                  assive mechaalcal valve at see not already benaded
                                       -                           As as intriating)which              event,    couldthereoccurare noTo be as taitiating                                           event, a l-
                ^I                                                 failures (FMVF's by esiattag 341f safety analyses.

h re, , FMYF would have to be postulated la the seceadary r line plant w e as sa example, a less of feedwater accident erhculd

               .;{                                                                                                                                                                  feedwate                                    .    '
                 ,?
             , '! (

break weald benad valve blockage. ie ins Ne other valv , t r.

                    't esisting redundancy requirements                                                                       failures for          of safety re                       f-As a sia le failure folieving as event,hich                                                           there  are are noc separa o                                                       a  valve blockage            and safety concerns ggi,ded, that valves w i       !                                              already opes are assumed to retaan astegrity.                                                                                                                    -

[ r, Regarding the afog of data gathering lacking; however, several programs, we feel ftha 9$ . 3enerally the availafailure in forty years to is determine ndervsy. presenti prob- T I* j! '

                              -                                       excellent industry programs to col set such data are u                                                                                                           ;

i' " and it must be coatluded that data sufficientskility

                                                                                                                                  -               . ~ . - - . . .

lsa est nl ' It is expected that the eversti probability #

                                                                                                                                                                  -             of an event p u pMYF et a critically located valve is very law.                                                 -                                       .

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ML20024C743: Difference between revisions

Latest revision as of 02:22, 16 February 2020

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Dear Mr Nasetis:

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ML20024C743: Difference between revisions

Latest revision as of 02:22, 16 February 2020

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Dear Mr Nasetis:

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