The vessel plug had been designed to take several positions depending on a servosystem related to temperature and pressure measurements. This proved far too complex and moved when it was not required to do so. It was altered to a fixed position for simplicity.
The high-speed argon blowers were changed for conventional low-pressure
Fig. 4.31. Cross section of the Rapsodje Reactor (39).
|
Identification Key for Fig. 4.31
Code no.
|
Position
|
Description
|
1
|
E5
|
Leaktight vessel
|
2
|
E6
|
Stereotopographical measurement position
|
3
|
B4-F4
|
Loop pipes (inlet and southern outlet)
|
4
|
A4
|
Nitrogen supply pipe for interspace II
|
5
|
G4
|
Southern purification loop
|
6
|
E5
|
Preheating jacket
|
7
|
C4
|
Nitrogen distribution annulus
|
8
|
C6
|
Preheating jacket keying
|
9
|
E4
|
Thermal shield
|
10
|
A4
|
Fill and drainage pipe
|
11
|
C4
|
Siphon breaker
|
12
|
E4
|
Safety injection pipe
|
13
|
D6
|
Support grid
|
14
|
D5
|
Neutron shield
|
15
|
D6
|
Diffuser
|
16
|
D7
|
Annular diaphragm
|
17
|
F6
|
Guard vessel
|
18
|
G7
|
Outer boundary
|
19
|
C2
|
Thermal deck
|
20
|
E3
|
Large rotating plug
|
21
|
D3
|
Small rotating plug
|
22
|
D2
|
Control plug
|
23
|
B1
|
Support flange for rotating plugs and leaktight vessel
|
24
|
B2
|
Support plate
|
25
|
E3
|
Anti-sodium barrier
|
26
|
El
|
Liquid joint
|
27
|
El
|
Lip joint
|
28
|
D5
|
Fuel assembly
|
29
|
E5
|
Breeder assembly
|
30
|
D5
|
Control rod
|
31
|
E4
|
Core cover
|
32
|
D3
|
Control rod guide tube
|
33
|
D1
|
Drive mechanism housing
|
34
|
D4
|
Handling guide tube
|
35
|
|
Ordinary concrete (d = 2.3)
|
36
|
|
Normal borated concrete (d = 2.8)
|
37
|
|
Heavy baryted concrete (d = 3.5)
|
38
|
|
Metallic insulation concrete (d = 5.4)
|
39
|
|
Rare earth concrete (d = 2.4)
|
Fluids used:
|
: cover gas—
|
-argon; main coolant—sodium; other interspace and preheat-
|
ing fluids—
|
-argon and nitrogen.
|
|
blowers with oil bearings. The more advanced components had previously been sticking.
Some of the previously inerted vaults below the operating floor were changed to air for convenience, although nitrogen was still retained within the reactor vault and around the primary system.
The air conditioning system within the containment began giving rise to a water collection problem that had originally not been recognized as a possibility. This problem was solved before start-up with the sodium — cooled reactor.