ML19322C398
| ML19322C398 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/27/1971 |
| From: | Dopchie H BELGIUM |
| To: | Beck C US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160934 | |
| Download: ML19322C398 (2) | |
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"~7 ASSOCIA t,0N VINQO7TE - 1640 ljlIODE-SAI!;T-or:1:1:SE - BELCI1nt, Assoco? tion sans but lucratif Controlcs - it& captions - bportiscs s
April 27, 1971.
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Chiques Postaux: 377 02 Socit!& Guhalo do Danqu3: 73 ;22 Danque de Uruxelles: A. 02/2r65 Dr. Glifford K. BECK Danque do Paris et dos Pays-Bas: 30535 Deputy Director of Regulation DGPARTEMENT SGCUllllG NUCLGAIRE U S. ATO:IIC Et:ERGY CO:CIISS10ll Nuc1 car Safety 02/017 UASllII;GTO:1 D.C. 20545 - U.S.A.
02/018.
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Dear Dr. Beck,
tp After writing to you yesterday concerninp. the use of grouted tendons in prestressed concrete containment structures, I take further liberty by inquiring about another probica, which has been presented to the owners of the Doci and Tihange P.U.R. power stations. This probica has been studied for some time, but no satisfactory answer has evolved up to now.
.The speatic.n is uhether thc lU.S.A.E.C.)hasjever[ investigated' the consc:
- quencesf ofi'al ruptuye, or} valve opening orffailure to.close,' af fect ing
, the vapor phase of a.Ucstinghouse pressurizor;?j If the answer is posi-tive, I should appreciate a very general description of these conse-quences and their safety iuplications.
q The dif ficulty occurs because.the_ pressurizer water. level would. rise,.
l<fue to boiling.inithe core,,hence neither _the low level signal,.nor_t2 (associated safety; injection; signal vould be antuated.-
jSafety idjecti6n.coubt be : actuated. by;a high[coniaincent. press'ure_ sign l
- if the escaping vapor is releasci in the pressurizer relief tank, th pressure rise in the containment could be substantially delayed,
- in the case of a rupture affecting the pressuri::cr, the vapor and va could be released in an open containment bui.1 ding, since building isolation is actuated either by a safety injection signal or by a high containment pressure signal.
The containment building can be open in at 1 cast two instances : in t1 course of pressure equalization, and during outside ventilation at ho.
shut down. Other instances could also occur, but generally involve se apertures.
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0 ASSOCI.
ON VINQOTTE
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-n llence,% pit' could be " anticipated that neithe _.,,..,,..,,,.., _,r safety;injecti' n nori
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,containmodt isolation [i[ac'tuathd,' a't leas funEil"d f tcTd lil317 radioactive release signal has closed the v'entilation or pressure equalization ducts.
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A further probica arises since tthe flow.
........ charging ' pumps.yould be; of-the Ehi.niiniEEd byTthE higt,i[p~a.cisurizeE l..evel..'s'lidi1I t. lie 'd. isch. a.rge f. low (-v
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r 0'wou:ld...,ncontribute.to the loss of coolant, "witho:ut affecting;.the pressu-
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I should also appreciate to knou if the largest rupture diameter, to be considered in the vapor phase of a precsurizer, is the diameter of the largest pipe ? A nanway is provided in the upper part of the pressurizer.
Again, I like to express ny greatest thankfulness for your continued attention to our prob 1cus.
4 1A Sincerely yours 1
- 11. DOPCllIE Directeur.
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