ML20128C428

Requests Listed Addl ECCS & LOCA Info for Review of Pol Application for Plant

ML20128C428
Person / Time
Site:	Monticello
Issue date:	04/15/1969
From:	Rosen M US ATOMIC ENERGY COMMISSION (AEC)
To:	Boyd R US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9212040407
Download: ML20128C428 (2)

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APR 151969

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1. 5. Reyd, A/D for aseater Projeete, tEL *'#'I 8"8 W '

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5. Imvine, A/D for asester EsgamL MWYICst&O - ADDIY10EAL ECCE Aus LaCA lupeas4&Yteu -

the following additismal Safermetten to seguised 8er ser sovier of the '

POL applicaties for the Monties11e seester.

1.

We end the ACRS have enked for further verifisation of the depree-surisaties inflesace of the IPCI system for all Sn's. The CE topical report, APED-MOS, describes tests which are intended to provide oesh verification by mid-1969. Will the test results be available to eenfirm your analyseet If met, then otherefoe domes-strate the adequacy of the ECCS decism for that range of intermediate breaks for which EPCIS depressurisation of the 'veooel is meet important.

That is, dersonstrate an adequate system performance margin with respect to a ture) pera meaniatful . eled tesperature limit (not the Ziraaley molting tow-2.

It appears from the drawings in the PSAE that a break in the RCIC atoem ised lias could rosuit la less ef MPCI sepab111ty due to proximity isolate of systems both systens).(the "hith area temperature" sighal would of this event. hacribe the likeliheed and causequemens 3.

A bubble rise velocity of 1 ft/ses is cited en page 6-2.35 for the .

liguid break emalysis, while a velseity of 2 f t/see is citet en .

page 6-2.40 for the steem break analysis. The 1 ft/see essemptima is less causarvative for datar= tut =g time of eers uncovery, while the 2 f t/ses is less eeneervative for estaraining ===t- 3 eve 1~

swell in the vieimity of the steen 11am mesales.- Give the reasom for using la seleet.A the tuo ease.

oesh valesities and establiek the esmeer,metamat your ^

.y 4.

Resed as the euromat state'of eashmelogy we de met beliese' that ad e less4f-eeelant assident smalyeso perfemmed for the Meatteella seester have adequate esmeervaties.

This to des to the iseerperaties of a transient CEF eticulaties and a tammelent eere fler salam1meten, neither of which heen been verified under bleadown eenditions. We have found that there is sufficient experimental evidence to justify year redweties of conservatism in one previene area of uneartainty; i.e. , the eve 11 9

9212040407 690415 PDR ADOCK 05000263 A PDR

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model required to realistically predict coolant level during blow-down. We believe that the LOCA analyses will be appropriately conservative with the level ovell model only if the dryout aseling phenomenen is Laeluded in the analyses of large breaks. The Osnaral Electric dryout cooling model has adequate verification to establish its senservaties. Provide a re-analysis of the LOCA without .using the transiest eritical beat flisa salaulaties.- Then provide a quan-titative assessment of the analytical conservatism retained in the 4

core haatup ealeelation for intermediate and large breaks (0.1' to 5.5 f t 2) . Include considerations of such things as the previces CEF calemlation, transition and film boiling following DNB, staam cooling, residual water level, and steam availability for the estal-9 water reacties.

Original signed by M. Rosen Horris Rosen, Chief RT-331A Nuclear Technology branch ,

DRLtNTS RJM Division of Reactor Licensing cc D. B. Vassallo, DRL

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ADRT Reading NTB Reading bcct S. Levine M. Rosen R. J. Mattson i

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