ML19262C215
| ML19262C215 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/07/1980 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002080336 | |
| Download: ML19262C215 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION UNITED STATES g
E WASHINGTON, D. C. 20555
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JAN 0 71980 MEMORANDUM FOR:
- 1. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors FROM:
G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - CONTAINMENT PURGE SYSTEM - RANCHO SECO (TAC 10206)
Plant Name:
Rancho Seco Docket No.: 50-312 Project Manager:
D. Garner Review Status: Awaiting Information The Plant Systems Branch has iientified the enclosed additional information as being required within 30 days in order that we can complete our evaluation of the electrical override / bypass aspects of the containment purge matter on schedule.
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G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Contact:
R. Scholl, X27162
Enclosure:
Request for Additional Information cc w/ enclosure:
1945 001 D. Eisenhut D. Shum W. Gammill J. Kerrigan L. Nichols G. Knighton G. Lainas V. Noonan E. Reeves F. Witt E. Adensam J. Zudans D. Garner R. Scholl D. Tondi gsooseso 3%
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR RANCHO SECO DOCKET NO. 50-312 1.
The docketed infonnation 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 ESF 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 actuation signal (e.g., pressure) to the isolation valvas.
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 the containmert isolation system and for every safety system impacted when an override is active.
4 - Diverse signals should be provids.d to initiate isolation of the containment ventilation system. Specifically, con-tainment high radiation, safety injection actuation, and containment high pressure should automatically initiate Containment Ventilatior Isolation (CVI).
5 - The instrumentation and control systems provided to initiate ESF should be designed 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 scnematic drawings of your purge and vent system and control room heating, ventilation and air conditioning system.
3.
Does the containment ventilation / purge valve isolation (CVI) incorporate any type of post-DBA manual override feature?
- The following definitions are given for clarity of use in this issue:
Override - the signal is still present, and it is blocked in order to perfonn 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.
1945 002
-2 4.
You state in your January 4,1979 letter that the safety features actuation system is initiated on high reactor building pressure or low primary system pressure. With your current design, will containment high radiation initiate CVI? Is your safety injection system actuated by the same low primary system pressure circuit or setpoint as is the conti.inment isolation?
4 1945 003