ML20073H141
| ML20073H141 | |
| Person / Time | |
|---|---|
| Site: | MIT Nuclear Research Reactor |
| Issue date: | 12/26/1978 |
| From: | MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE |
| To: | |
| Shared Package | |
| ML20073H135 | List: |
| References | |
| PM-7.4.4.2, NUDOCS 9410050132 | |
| Download: ML20073H141 (2) | |
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l PM 7.4.4.2 Page 1 of 2 i
/.4.4.2 Inservice Inspection of Primary Core Tank and Fuel Required Conditions:
1.
Reactor shutdown for at least forty-eight hours.
2.
Reactor top lid removed.
3.
Primary coolant pumps secured.
4.
Core tank level at overflow with MM2 either on or off as desired.
5.
Senior Operator on reactor top, licensed operator in control room, RPO j
notified that procedure will be performed.
Procedure 1.
Inspect the interior of the primary coolant tank for evidence of corrosion, missing or loose bolts, misalignment, interference, potential malfunctions I
and/or other improper conditions. Record any abnormal conditions for each of the components listed below. Report any such conditions to the Super-intendent.
Component Comment (_If required)
Tank Upper grid Latch 1
Spider & inserts l
6 Shim blade and offset plates Reg rod and offset plate l
Guide tubes Connecting arms and armatures Magnets Blade and rod drives i
Tubing, brackets, duany, etc., for in-core facilities l
Pos. #
Pos. #
j Pos. #
l f
Pos. #
Other in-core experiments.
I i
Magnet current connectors j
I In-core fuel nozzles (upper)
In-core fuel plates (as visible) j
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PM 7.4.4.2 Page 2 of 2 e
t Storage ring
_ Storage ring fuel Other items in storage Tank overflow
, Low IMi-1 probe housing l
Level gedicator tubing Outlet temp. sensors Interior surface of annular shield
, Gasket Top shield lid (lower surface, plugs, lifting eyes, etc.)
2.
Visually, inspect the fuel elements in both the core and in the storage ring using externally supplied light. Do NOT physically manipulate any element unless such an operation has been approved under procedure 3.3.3, Changing a Fuel Element in the Reactor Core. Note any discoloration of fuel plates etc.
Position Element #
Comment (If required) 1 I
i i
t l
3.
Repeat step 2 using Cerenkov radiation as the sole source of illumination.
As much external lighting as is possible should be secured so as to allow r
the glow from the Cerenkov radiation to backlight the fuel elements. Visually i
examine each element's fuel plates for any obstruction to the passage of light.
Defects, such as blisters, will appear as dark blotches against the. blue glow.
of the radiation. Notify the Superintendent, Radiation Protection Officer, and Director for Operations or their representatives if any such defects are newly detected. Do not take the reactor critical until such notification has been made.
1 Position Element #
Comment (If required)
I certify that the above inspection has been properly completed and that any defects have been properly noted and reported.
SR #. O-78 -2 7 DEC 26 We Signature Date 4
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