ML20003F573

Discusses Ice Condenser & Mark III Containments.Recommends Protection Against Incidents Re Weak Containments.If Commission Defers Acting on Problem Until Completion of Degraded Core Cooling Rulemaking,Certain Options Foreclosed

ML20003F573
Person / Time
Issue date:	10/27/1980
From:	Gilinsky V NRC COMMISSION (OCM)
To:	Ahearne J, Bradford P, Hendrie J NRC COMMISSION (OCM)
References
NUDOCS 8104230029
Download: ML20003F573 (7)

Text

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u k-MEMORANDUM FOR CHAIRMAN AHEARNE I A E8f p #'%p.2,M, Wer Dj i

COMMISSIONER HENDRIE kb COMMISSIONER BRADFORD

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SUBJECT:

ICE CONDENSER AND MARK.III CONT S

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In approving the issuance of the sequoyah iull power license, the Commission required measures for hydrogen control in the ice condenser containment.

Now the Commission needs to deal with the other ice condenser and Mark III plants.

In response to my request, OPE prepared the attached tabulation of the status of reactor units with ice condenser *or Mark

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III containments.

Those containments have design strengths of 15 psig or less and, like Sequoyah Unit 1, cannot in the absence of further analysis be counted on to remain intact following a hydrogen burn similar to that at TMI-2.

The units on the attached table can be grouped within the following categories:

(1) those with the containment construction completed or essentially completed (all of the ice condenser plants and 5 of the 19 active Mark III cases),

(2) those with a small percentage of the containment constructed (7 Mark III units), (3) those with a CP granted but with little or no part of the containment constructed (2 Mark III units) and (4) those under CP review (5 Mark III units). (I would add the Manufacturing License application to this last category.)

We should not at this point dismiss the possibility of requiring all plants except those in the first category to either be inerted or to be redesigned to a higher containment design pressure -- one that is sufficiently high so that there is reasonable assurance that the containments will l

remain intact following a burn of a substantial quantity of hydrogen. For those plants in the first category, we should direct the staff to require the same measures at them that are or will be required of Saquoyah.

Even here I would continue to study the inerting option as a back-up.

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I have treated the Mark III on a par with the ice condenser plants on the basis of NRR presentations both in terms of the problem they pose and their resistance to inerting.

If the Mark III containments can be inerted ' en construction of the Mark III plants need not be affecte.

If there is l

a plausible argument to be made to distinguish Mark III's l

8104230029

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2-from ice condenser plants in terms of accident risk, we should hear it.

In any case, as I have said before, I believe we should require protection against what we have experiencqd.

And we should face the issue of weak containments now.

If the Commission defers acting on this problem until completion of the degraded core cooling rulemaking -- an undertaking of several years -- it will foreclose important options.

I would like to meet on this subject within 2 weeks.

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Victor Gilinsky

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