ML20078P064

Control Room Ventilation Sys Interim Operation Plan

ML20078P064
Person / Time
Site:	Byron
Issue date:	10/27/1983
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20078P057	List: ML20078P054 ML20078P060 ML20078P064 ML20078P069
References
7510N, PROC-831027-01, NUDOCS 8311030185
Download: ML20078P064 (2)

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ATTACHMENT B

CONTROL ROOM VENTILATION SYSTEM INTERIM OPERATION PLAN I

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October 27, 1983

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8311030185 831027 PDR ADOCK 05000454 A pm

II. ' Control Room Ventilation System The Control Room Ventilation System at Byron is a common system for Unit 1 and Unit 2 which serves the Control Room, Auxiliary Electric Equipment Rooms, Cable Spreading Rooms,.HVAC Equipment Rooms and various other areas of the plant. Two identical trains are provided for total redundancy. A complete description of the system is provided in Section 9.4.1 of the Byron /Braidwood FSAR.

Current testing commitments (FSAR Table 14.2-36) require that the system be operational and tested prior to Unit 1 Fuel Load.

During Fuel Load the potential for the release of radionuclides is very insignificant. In the cases of a fuel handling accident or an accidental criticality, the fission product inventory is trivial in comparison to toose inventories employed by the FSAR Safety

. Analyses. This reduced radiological inventory will not threaten Control Room habitability nor will it pose a significant hazard to public health and safety. As a result, the Control Room Ventilation System does not need to be entirely operable. The startup plan for this system has been changed-to the following:

1. Prior to Unit 1 Fuel Load, one train of the Control Room Ventilation System will be operational, balanced, filter tested and preoperationally tested.

2. Prior to Initial Criticality of Unit 1, the second train of the Control Room Ventilation System will be operational, balanced, filter tested and'preoperationally tested.

Such reduced system capabilities will permit activities prior to initial criticality to proceed with acceptable levels of risk.

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