ML19289G109
| ML19289G109 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/23/1979 |
| From: | Kerrigan S NRC COMMISSION (OCM) |
| To: | Vollmer R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906260343 | |
| Download: ML19289G109 (2) | |
Text
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May 23, 1979 L,, < W A u- (
( L).z'L Lr fl G M EMO RAfC UM FOR:
Richard H.
Vollner F RC M -
J.
Kerrigan SU2 JECT:
CONTA !NMENT I N-LEAKACE R
- T
- ntain ent dif#erent ia! p essure (cantainre,t-outside ci-) was easure: with a ;P cauge tnat has a range o' -5 to 12 psi witn an a c c u r a c'.
. 2 o' the span.
The accuracy of the recorde.
reasure ents is possib1y on the order :# :.1 -
,2 psi because of the sca!e usei on the strip recorJer.
easure ents recorJed at noon each dav were used airng wit"
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nom,ti e ca et-i: pressures to obtain *he absolute contain ent
-ressures 'o-the ceriod h/2
/M-Ine absolute : ntain ent oressures were normalized to a stancare te perature
- 7 3 0 F',
using the average containment te oerature obtainec frem 6
- ontain ent te-cerature readings.
The estirated accura:v o' the O
a.erace contain ent tercerature is,+ S F (translatinc into an un:ertaint in t he normal i z i ng factor on pressure of 1f osi).
Tne final corrected pressures (co r re c t ed for temperature and Sa cretric pressure 'luctuations) are esti-ated to Save an ancertaintv c' _.3 psi.
The corrected pressures (noont ire est imates) were plotted to catain an estimate of the in-leakage rate.
A straight line was drawn through the data and the slope of the 1ine was determined to be.55 psi /h? davs
.01 psi / day.
The average contain-ent pressure during this time period was 14 psi.
The ave rage pressure decay then is. W'/ day.
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