Interlock Defeat

System(s) Affected:
Safety

Interlock to be Defeated:
Air Monitor #31 warn limit raised

Implementation:	Number:
Date: 2024-08-08 Time: 15:49:00	2024-402
Implemented By: David Bandiera
In Consultation With:

Status: Removed

Estimated Duration:
8 weeks

Reason for Defeat:
To allow BL1A current at 100uA without setting off the Air Monitor. Ventilation space for IPF Hot Cell was changed which increased the air activation levels seen by this monitor. Approved by Radiation Safety Officer until Mini Shutdown 2024.

Number of Yellow Tags:
2

Location of Defeat Tag(s):
1) DCR Defeat Board

2) Rear of Rack A

How Was Defeat Implemented?
Where is Defeat Located?:
Working Warn Limit changed from default 40 kcpm to 120 kcpm.

Describe Alternate Protection:
Air Monitor Warning will still occur but at the value of 120 kcpm.

Fault Reports:

Work Permits:

Disables:

Interlock Defeat

Removal:	Number:
Date: 2024-09-26 Time: 14:34:00	2024-402
Removed by: Ryan Anderson

Status: Removed

Interlock Verification Method:
Air monitor warn limit returned to original value using rack A computer. XT page 12A displays warn level as 40KCPM, the default level. The overhead air monitor page displays the same, and the number is no longer cyan.

Number of Tags Removed:
2

Comments: