ML20086U171
| ML20086U171 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/13/1967 |
| From: | Sears J US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML20086U000 | List:
|
| References | |
| FOIA-95-36 50-219-67-02, 50-219-67-2, NUDOCS 9508030300 | |
| Download: ML20086U171 (5) | |
Text
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U. S. ATOMIC ENERGY COMMISSION-t r
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- March 13, 1967-l 1
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"^t CO REPORT NO. ' 219/67-2.
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Title:
JERSEY CENTRAL POWER & LIGHT COMPANY l
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~ Dat'e of Visit:
March 4 and 5, 1967 By
- ' J. R. Sears, Reactor. Inspector _
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b Sb SIDO4ARY 4
The Oyster Creek Facility was visited during a heatup of the dry well.
The maximum' wal1~ temperature reached was j
1210 The_ goal. of the heatup was 180.
A clear explanation i
0 for this value 'could not be obtained ' from. people at the site,
-s nor from the Applicant.
Another attempt at heatup will be made over the March 11-12 weekend.
.9 DETAILS I.
Scope of Visit 1
A visit was m71de to the Jersey Central Power & Light Company (Jersey Central) reactor site at Oyster Creek, New Jersey, on March 4 and 5, 1967, by Mr. John R. Sears, Reactor i
Inspector,-Region I, Division of Compliance.
The purpose of-the visit was to witness the heatup of the dry well.
6 Discussions were held with the following:
Mr.-David Kregg, Project Manager, Burns & Roe
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Mr. John Archer, Structural Engineer, Burns & Roe -
.l Mr. M. Wester, Project Engineer, General Electric
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Results of Visit k[%.-
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Dry Well Heatup i
The purpose of the heatup had been7 stated to be the-compression of the compressible material surrounding the j 'j l dry well*,
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'The inspector reviewed the detailed procedures.for 4
the heatup.. Downcomers'into the torus are still capped.
Twenty-four thermocouples were installed-on the bare < metal-inside surface of the dry well.
Three thermocouples.were located at each of eight elevations. At each succeeding level, the locations ofthe thermocouples 'were rotated 30.
Five thermocouples were installed on wires or chains at f
succeeding elevations to measure air temperature.
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.Eight 60 Kw heaters and eight 5000 cfm fans were installed around the 23' level.
A total of three pressure j'
gauges were installed at penetrations at succeeding elevations.
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Shield wall ' temperatures were also taken.
Micromete'r-i dial gauges for measurement of horizontal and vertical move-ment were observed at the. following penetrations:
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Elevation Openinq I
27' x66 and 23x-2A i
36 x32 l
44 x36 62 x63 and x12A l
86 x18 The dry well pressure was pumped to 50 peig, the j.-
integrity of penetrations checked and then the pressure was j
1 bled to 30 psig.
The heaters were started about 1 p.m.
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on Saturday.
Following are the readings at 3 p.m. and j
at 10 p.m.
l (continued)
- CO REPORT NO. 219/66-2, paragraph II.F.
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Results of Visit (continued).
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-Metal Air E-
. Temp.
Temp.
Pres-Displacement at Elevations j
Time (Avg. ) (Ave.) 'sure 27' 36' 42' 63'
-87'.
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if 3:00 pm 50 64
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.318 _.031.233.033_.125.217.593.284.210.196 "
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.397.012.304.042.175.287.6254.334.285.236.i The procedure specified that'the maximum pressure-was to be 40.psig.
The. heaters were to be cut off at a wall temperature of 1100 plus the shield temperature.-
'1 Mr. Archer told the inspector that no overshoot was j
expected since the dry well top and the torus were not -in-1 sulated.
.Tgeheaterswouldbekeptonuntilthewall_ temperature ~
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reached 180.
He said that it was his' understanding that this value had been arrived at by adding 1100-+ 500 ' (shield temperature) 0
+ 20.
This last 20 was said to correspond to the expected ' "~~-
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spring-back of the compressible material after the temperature i
l and pressure are reduced to ambient.
Mr. Archer said that, in his opinion, this heatup simulated the conditions which would accompany the maximum credible accident,1that as a consequence the criterion for an acceptable heatup should-not be the amount of expansion.of the dry well.
No one at. the site during' the heatup was sufficiently
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familiar with accident analysis to justify to the inspector the value of 1100 as the temperature rise due to the accident; 0
or if, indeed,. 110 is the proper value, why it should not j
be added to 130", which was stated to be the expected ambient air temperature in the dry well during normal operations.
The maximum temperature achieved over the weekend 0
0 was 150 (air) and 121 (dry well metal).
Mr. Abe Dunning,.
the GE Site Manager, informed the inspector that most of the. heat loss was from the capped downcomers to the uninsulated torus.
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- f Results of Visit- (continued)
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't He said that they would install some temporary insulation on the torus and the dry well top, and increase the heater:
capacity by about 50% and attempt the heatup again over the' l
March 11-12 weekend.
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B.
Exit Interview j
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a A formal ex4t interview was not conducted due to the -
nature of the visit.
However, the inspector phoned, at a later date,. Mr. Donald Reese, Jersey Central Project Manager, who stated that he had not looked into the question of the proper temperature for this heatup.
He said that he would ask the GE designers who had made the analysis for an.
i explanation.
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B. H. Grier, Senior Reactor Inspector 14 MAR 1957 Division of Compliance, HQ THRU:
J. P. O'Reilly, Senior Reactor Inspector Region I, Division of Compliance J. R. Sears, Reactor Inspector JERSEY CENTRAL PoitER si LIGHT COMPANY CO REPORT NO. 219/67-2 I don't understand the whole story on this heatup, and so far no one I've asked can give me a clear answer.
I've suggested to Tedesco and to Reese that they get together to make sure that at least they understand it, and that they do this before the next attempt at heatup.
I drew a sketch of the dry well, and its insulation and lack thereof, and presented the problem of its heatup to Mark Sears, a 13 year old physicist at Bellport Junior High.
He said they ain't going to make it.
It's a shame that conflict of interest regulations prevent GE from hiring him as a consultant.
cc:
L. Kornblith, Jr., CO:HO omcr >
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