ML19221A588

Review of Sandia/Nrc Emergency Containment Vent Design Package. Comments Encl

ML19221A588
Person / Time
Site:	Crane
Issue date:	04/16/1979
From:	Thiesing J INDUSTRY ADVISORY GROUP
To:
References
OSP-790416, NUDOCS 7905230254
Download: ML19221A588 (11)

Text

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Hemo No. } M" f 6 VsOYs5.

TASK CLOSE SJT DOCIFINT b

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feview o f. O // / a c Tast Scoge

&Mwcu O r # Y ~l; V d Des ?n 0 Achae a

u To:

M. Levenson

5. Levy E. Zebroski Task Mo.

Date Complete Y'/d-7Y Reason felt task is complete:

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altached.

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Members of Cennittee

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C MAf Commit L ader e

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s' To:

Milt Levenson Date: April 16, 1979

(])

Subject:

Emergency Containment From:

J. W. Thiesing

~

Ven?).ng Package Comments on emerg ncy containment venting package received fr om Sandia/NRC follow:

6 (1) Page 1

.0 Ci I release represents about 10% of current total activity of I-131 (core 6 RCS) seens reasonable - given core melt (no containment or vessel r ooling) and containment failure above grade.

(2)

Page 2

" Steam-condense" and " steam-no condense" labels appear to be in terchanged.

(3) Page 3 - Containment pressure -

Spike up to 70 psig at 374 hours0.00433 days <br />0.104 hours <br />6.183862e-4 weeks <br />1.42307e-4 months <br /> is too fast.

Would expect only about a 12 psig per hour (superheat from core heat) at today's decay heat level.

I' do not understand rapid drop in containment pressure after vessel failure (no cooling of containment was assumed).

Pressure ~would remain constant at 70 psig until debris heated water pool in containment.and began steaming.

End result is the same, however, failure above grade.

(4)

Page 4, Appears to postulate 20%

Core I-131 becomes airbo:.ac.

(5) Page 5 - System Desi;n

'1.

()

All air handling systems should be designed for 150 psig if maximu utility is to be gained (150 is probable containment failure prer,sure).

2.

What is purpose of N, system - I presurne it is inerting for H, bot the utility of this Is questionable.

(Prevent H burn in exhaust line, 2

I suppose).

3.

3 x 106 Btu /hr cooling on diffuser tanks will not keep up with decay heat until about July 1, 1979.

4 Why install return line to containment.

The presumption of containment overpressure mitigates against its use except as a routine cleanup tool!

t If there is urgency to install this system, it can probably not be well-enough thought out to serve as the ultimate clean up mechanism.

5.

Diffuser tanks should be buried in yard outside aux building.

Line from.

containment to diffuser tanks should also be buried.

Cooling system must also be shielded.

6.

Need valves in filter bypass.

(6) Page 6 - Options

. 4 {a rb y S. cit'/t's,J e

1.

Backup filters (Option 2) will require demistery, and could defeat system by becoming clogged - Recot: ment ifEPA cnly, with bypass capability.

~

'J 2.

Option #3 - There is not a recombiner in the world that will handle the flow rates that will be required.

165 159

~

evensen ril 16,1979 y

3.

Option #4 - Should not put tanks in fuel pool - it's being used for tant farm. Also, violates last constraint on page 7.

4 Option # A'- What is a "Itydrogen combustion mechanism."

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