ML20125D966

Forward Request for Addl Info Re Containment Purge & Venting Sys So That Evaluation of Electrical Override/Bypass Aspects of Containment Purge Matter Can Be Completed on Schedule

ML20125D966
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	12/17/1979
From:	Lainas G Office of Nuclear Reactor Regulation
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8001220021
Download: ML20125D966 (2)

Text

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DEC 171979  !)[hj) $u9fm.'/.*7 , n-u cn ;

.-!>,, UL, ME'iOFANDUM FOR: A. Schwencer, Chief l Operating Reactors Branch #1 i Divisien of Operating Reactors l FROM: G. Lainas, Chief

. Plant Systems Branch Division of Operating Reactors

SUBJECT:

REOUEST FOR ADDITIONAL INFOR"ATION - CONTAIN"E:lT PURGE SYSTE:1 - ZION UNITS 1 & 2 (TAC 10200) l Plant Name: Zion Units 1 & 2 l Occket Nos.: 50-295/304 -

Project.vanager: E. Reeves Raview Status : Awaiting Information Plant Systems Branch has identified tne enclosed additional informatien as being required witnin 30 days in order that we can complete our evaluation 'of the electrical override / bypass aspects of the containcent purge matter on senedule.

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G. Lainas, Chief Plant Systens Branch Division of Operating Reactors

Contact:

R. Scnoll, X27162

Enclosure:

Raquest for Additional Information cc w/ enclosure:

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Enclosure RE0 VEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR ZION UNITS 1 & 2 DOCKET NOS. 50-295/304

1. The docketed information as to the design of Engineered Safety Features (ESF) such as the Containment Ventilation Isolation (CVI) systems does not adequately address the following areas. Please discuss how your design conforms with each:

1 - The overriding

• of one type of safety actuation signal (e.g.,

radiation) shculd not cause the blocking of any other type I of safety actuation signal (e.g. , pressure) to the isolation val ves .

1 2 - Sufficient physical features (e.g., key lock switches) should l be provided to facilitate adequate administrative controls.

3 - The system-level annunciation of the overridden status should be provided for every safety system impacted when an override is active.

4 - Diverse signals should be provided to initiate isolation of the containment ventilation system. Specifically, containment hign radiation, safety injection actuation, and containment i high pressure should automatically initiate Containment '

Ventilation Isolation (CVI).

5 - The instrumentation and control systems provided to initiate ESF should be design and qualified as safety-grade equipment.

6 - The overriding or resetting"*of the isolation actuation signal should not cause the automatic motion of any ESF valve.  !

2. Provide the process and instrumentation (PSID) and schemat':. l drawings of your containment purge and vent system and control '

room heating, ventilation and air conditioning (CRHVAC) system.

The following oefinitions are given for clarity of use in this issue:

• 0verride - the signal is still present, and it is blocked in order to perform a function contrary to the signal; ** Reset - the signal has come and gone, and the circuit is being cleared to return to the normal condition.

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