ML20137E294
| ML20137E294 | |
| Person / Time | |
|---|---|
| Site: | University of Virginia |
| Issue date: | 12/31/1984 |
| From: | VIRGINIA, UNIV. OF, CHARLOTTESVILLE, VA |
| To: | |
| Shared Package | |
| ML20137E041 | List: |
| References | |
| NUDOCS 8511270233 | |
| Download: ML20137E294 (3) | |
Text
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d'V University of 'lirginia License R-66, Docket No. 50-62 Addendum to 1984 Annual Report 6.0 Unplanned Shutdowns Following is a list of unplanned shutdowns on the UVAR reactor during the calendar year 1984 1-3-84 Scram - Instrument noise on Power Range #2. Corrective action:
none.
1-5-84 3 scrams - Instrument noise on Power Range #2.
Corrective action:
replaced detector and cable connectors.
1-8-84 Scram, instrument noise on Reactor Face monitor. Corrective action: none 1-17-84 Scram: Instrument noise on Power Range #2.
Corrective action:
none.
1-26-84 3 scrams: Instrument noise on Intermediate Channel period, power was steady. Corrective actions:
replaced connectors at detector.
2-1-84 2 scrams: Noise on Power Range #2. Corrective action: none 2-8-84 Scram: Noise on Reactor Face Monitor. Corrective action: none Scram: High reading on Reactor Bridge monitor while moving fuel at far end of pool. Corrective Action: fuel movement was terminated.
2-14-84 Scram: Power Range #2 - caused by malfunction of linear recorder in servo: Corrective action:
none.
2-22-84 Scram: Power Range #1 - caused by malfunction of linear recorder in servo: Corrective action: Compensating voltage to linear channel not functioning properly. Replaced compensating voltage cable from console to reactor bridge.
System checked out o.k.
,2-27-84 Scram: noise in console, reactor was sub-critical. Corrective action: none.
2-28-84 Scram: Intermediate period while moving Sb-Be source near detector. Corrective action: moved source.
3-7-84 Scram: Operator forgot to move range switch when going above 200 kw. Corrective action: Operator was reminded of correct procedure.
Scram: Power Range #2 - Reactor was operating at 200 kw corrective action: none.
3-26-84 Scram: Noise in Reactor Face Monitor. Corrective action; none.
4-17-84 Scram: Intermediate Period while moving Sb-Be source near detector. Corrective action: moved source.
Scram:
Power Range #2 - moved range switch too early while decreasing power. Corrective action: none.
4-26-84 Scram: Range switch indication - noise, Corrective action:
none.
4-30-84 Scram: Noise in Power Range #2 while moving rods. Corrective Action: none.
5-8-84 Scram:
Intermediate Period when moving source near detector Corrective action: moved source.
5-10-84 2 scrams:
Intermediate period when moving source near detector. Corrective action: moved source.
,5-14-84 Scram: Intermediate Period when moving source near detector.
Corrective action: moved source.
0511270233 851118 PDR ADOCK 05000062 R
5-23-84 2 scrams - loss of building power. Corrective action: none 5-25-84 Scram: Noise in Bridge Radiation Monitor. Corrective action:
none.
6-1-84 Scram: Loss of power to secondary console. Corrective action:
none.
6-5-84 Scram: Loss of building power.
Corrective action: none 6-7-84 Scram: Noise on Bridge Radiation Monitor. Corrective action:
none.
6-9-84 Scram: Loss of building power. Corrective action: none.
6-11-84 3 scrams - Noise on Bridge Radiation Monitor.
Corrective action: exchanged bridge detector with demineralizer room detector. System functioning properly.
7-6-84 Scram: Bridge radiation monitor when sample was removed from rabbit. Corrective action:
sample placed in shielded container.
7-6-84 Scram: Loss of building power during storm.
Corrective action:
none.
7-11-84 Scram: Noise in console - indication of primary pump off although pump was running. Corrective action:
none.
7-18-84 Manual scram due to H 0 leak in demineralizer room.
Corrective 2
action: repaired leak.
7-20-84 Scram: Noise while moving regulating rod. Corrective action:
none.
8-6-84 Scram:
Noise in Intermediate Period channel. Corrective action: none.
8-8-84 Scram: Loss of building power.
Corrective action:
none.
8-13-84 Scram:
Loss of building power.
Corrective action:
none 2 scrams - Noise in Range Switch. Corrective action: none Scram: Noise in Power Range #2. Corrective action:
none 8-22-84 Scram:
Power Range #1 while adjusting detector position.
Corrective action:
readjusted detector position.
- 8-28-84 Scram: Building power surge tripped primary pump off relay.
Pump was already off in natural convection mode. Was preparing to load fuel in reactor for new loading. Corrective action:
none.
Scram: Moving fuel element near detector while loading.
Corrective action:
reset console and proceeded with loading.
Scram: Noise in console caused pump off scram. Reactor was in natural convection mode. Corrective action: none.
10-9-84 Scram: Electrical noise in console. Corrective action: none.
Shutdown - Rod #3 dropped. Corrective action: adjusted magnet current.
10-10-84 Scram: Noise in Power Range #2.
Corrective action: none.
10-23-84 Scram: Building power failure. Corrective action: none.
10-2-84 Shutdown: Rod #3 dropped. Corrective action: adjusted magnet current.
10-24-84 Shutdown: Rod #3 dropped. Corrective action; adjusted magnet current.
10-30-84 Shutdown: Rod #3 dropped.
Corrective action: adjusted magnet current.
11-9-84 Scram: Showing trainee power an to pump scram. Corrective action: none, 11-15-84 Scram: Moving Sb-Be source near detector. Corrective action:
moved source.
- 11-17 Scram: Manual scram when finishing rod calibrations to avoid exceeding 1 Kw. Corrective action: none, 11-20-84 Scram: noise in power range #2 (indicator was reading 105%)
Corrective action: none.
11-28-84 Scram: noise on power range #2 (indication was reading 101%)
Corrective action: none.
12-6-84 Scram: Keyswitch - operator inadvertently bumped switch.
Action taken: none.
12-18-84 Scram: Range switch - operator moved range switch too soon when reducing power. Action taken: none.
12-20-84 Scram: manual scram by operator due to problem with rabbit system. Action taken: corrected problem with rabbit.
12-2.1-84 Scram: noise on bridge monitor. Action taken: surveyed area with portable monitor and found no high radiation.
Scram: Noise on Power Range #2 at il5%. Action taken:
Adjusted chamber position.
,