ML19308B758
| ML19308B758 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/25/1971 |
| From: | Dopchie H BELGIUM |
| To: | Beck C US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160944 | |
| Download: ML19308B758 (2) | |
Text
_ _ _ _ _ _ _ _ _ _ _ - _ _.
'o ASSOC // 'Ot/ Vil/QOTTE -1640 RHODE-SAINT r"?;ESE - BELGIUM.
]
-,--,s Association t..s l>ut lucratet j
gl Contr61cs - R6coptions - Exportiscs 3gne 25, 39,3, i
L-Rhodo-Saint-Conuso 16llplaono: (02) 58 35 60 b
TMex : (02) 22S 50 i
Cin as Postaux: 377 02 h
Socitt6 Gin 6 tale de Banque: 78 222 Banquo dc brutclics: A. 02/71C5 Dr. C11[!ord E. DECK Danque de Pietis cf des Pays-Bas: 00535 Deputy Director of Regulation U.S ATOMIC ENERGY C0'01TSS10N DGPARTEMENT SGCURITG t/UCI.GAIRE
~
Nucicar Safety 02/017.
Pear Dr. Beck, I have well received your letter of june 4,1971, uhich nost adequately answers the questions I asked concerning prestressed concrete contain-nents pressure and tendon tests. I am cost grateful to you for your continued obligingness.
In ny letter dated april 27, 1971, I took further lii.>crty by inquiring about. thc. prob 1cas. associated.with a rupture, or valve, opening or
) failure to close, af;fecting the vapor phase of a Uestinghouse presso-trizer. Since you do not mention this letter, I fear that it night have been lost and enclose a copy of it.
In the annexed copy, I have corrected the nisuse, at tuo instances, of the word "would" instead of "should". The mistake was caused by the lack of distinction between these two forms of the conditional code, in the French language.
- s of today, the problen has evolved in the following direction, at 1 cast for a 390 IM-c, two loops, Doel unit :
- for a[ breach of _.lcss than about one' inch thc % scape of' vapor is t
( sufficiently_ s:re.11,_ so that tSc. pressure remains constant, duc, to the. capacity of the pressurizer heaters; thejpressurizer water Icyc1 remains unchanned due to proper action of the charging pumps; 3
T
- for an uncontrolled discharge, corresponding, to_ a.diaceter [1 css than' about(two inches, the operator has more than{30 minutes t.o intervene;
- for an uncontrolled discharge in the closed containacnt building, corresponding to a diameter of!2 to 6 inches;(6 inches is the size of the largest pipe connected do the' vapor phase of the pressurizer),
theihigh containment, pressure signal should.. actuate the, safety.injec-tion in time to save the core, even if the largest containcent cooling capacity is operating; 8001160k
A
""A ASSOC
'lOtt VIllQOTTE 2,
[~ ' ~~ ContidIcs - Il6ccplions - Expctlisaq
- b N
/
/
ll
//
e
//
)
I Kucicar Safety 02/01~.
)
- for the same discharge in the pressurizer discharge tank, the time needed for the rupture disks to release the vapor in the containment is comparatively small, so that the preceding conclusion is not modified;
- the high pressurizer water Icvel signal may not conclusively be
.used (together with the low pressurizer pressure signal) to generate the safety injection signal; indeed the cater "1cyc1" neasurement is rather a uater ucight ncasurement, and the signal may not be actua-ted since the post-accident density, of the uixture of water and vapor in the pressurizer, is low.
tuolprobicas'emaintobesolved:
- Ucnce, r
- to find aL supplccentary signal to close. the containcent _ ventilation',
and pressure equalization ducts;
- to 1.now if a larger rupture.than 6 inches is to be considered, taking into account the presence of a nanway in the upper section of the pressurizer.
4 I like to confira ny greatest thankfulness for any attention you uould give to this problem, and remain Sincerely yours
/
/
/
pl. DOPC111E Directeur.
Enclosure.
200R ORIGINAL e
e e
.