ML19305C275
| ML19305C275 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 01/09/1980 |
| From: | Schwencer R Office of Nuclear Reactor Regulation |
| To: | Peoples D COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8003260457 | |
| Download: ML19305C275 (3) | |
Text
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UNITED STATES l
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NUCLEAR REGULATORY COMMISSION o
WASHINGTON, D. C. 20555
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January 9,1980 Docket Nos. 50-295 and 50-304
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Mr. D. Louis Peoples Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Peoples:
As we advised you in our October 23, 1979 letter relating to an interim commitment for use of the containment purge and vent valves at Zion Station, our review of the long term issue is continuing.
In order that our review of your long term proposals continue, you are requested to provide the additional information shown.irLthe enclosure.
Please provide the requested information within 45 days of receipt of this letter.
7 Sincerely,
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A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors i.. cl osur e :
l Request for Information l
cc: w/ enclosure l
See next page U U 0 3 2 60 49 7
s Mr. D. Louis Pecples Commonwealth Edison Company January 9,1980 cc: Robert J. Vollen, Esquire 109 North Dearborn Street Chicago, Illinois 60602 Dr. Cecil Lue-Hing Director of Research and Development Metropolitan Sanitary District of Greater Chicago 100 East Erie Street Chicago, Illinois 60611 Z'on-Benton Public Library District 2600 Emmaus Avenue Zion, Illinois 60099 Mr. Phillip P. Steptoe Isham, Lincoln and Seale Counselors at Law One First fiational Plaza 42nd Flcor Chicago, Illinois 60603 Susan N. Sekuler, Esquire
-re e-Assistant Attorney General Environmental Control Division 188 West Randolph Street, Suite 2315 Chicago, Illinois 60601 l
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lC REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR ZION UNITS 1 & 2 DOCKET NOS. 50-295/304_
The docketed information as to the design of Engineered Safety Features (ESF) such as the Containment Ventilation Isolation (CVI) l.
Please systems does not adequately address the following areas.
discuss how your design conforms with each:
1 -- The overriding
- of one type of safety actuation signal (e.g.,
radiation) should not cause the blocking of any other type of safety ectuation signal'(e.g., pressure) to the isolation valves.
2 - Sufficient physical features (e.g., key lock switches) should 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 high radiation, safety injection actuation, and containment high pressure should automatically initiate Containment Ventilation Isolation (CVI).
- The instrumentation and control systems provided to initiate ESF should be designed and qualified as safety-grade equipnent.
6 - The overriding or resetting **of the isolation actuation signal should not cause the automatic motion of any ESF valve.
Provide the process and instrumentation (P&ID) and schematic 2.
drawings of your containment purge and vent system and control room heating, ventilation and air conditioning (CRHVAC) system.
The following cefinitions are given for clarity of use in this issue:
f
- 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 l
l condition.
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