ML19256G571
| ML19256G571 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/06/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912310470 | |
| Download: ML19256G571 (3) | |
Text
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DEC 6 1979 MEMORANDUM FOR:
R. Reid, Chief, Operating Reactors Branch #4, D0R FROM:
G. Lainas, Chief, Plant Systems Branch, D0R
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - CONTAINMENT PURGE SYSTEM - CALVERT CLIFFS UNITS 1 AND 2 (TAC 10218)
Plant Name:
Calvert Cliffs Units 1 & 2 Dockets Nos.:
50-317 & 50-318 Project Manager:
E. L. Conner Review Status:
Awaiting Information Plant Systems Branch has identified the enclosed additional information as being required in order that we can complete our evaluation of the electrical override / bypass aspects of the containment purge matter.
kh(Ech-vG. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Enclosure:
As Stated
Contact:
R. Scholl X-27162 cc w/ enclosure:
DEisenhut DShum WGammill JKerrigan LNichols GKnighton 1658 123 Glainas VNoonan EReeves FWitt EAdensam JZudans Econner RScholl DTondi 79123104'/6f
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Enclosure REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR CALVERT CLIFFS UNITS 1 AND 2 00CKETS NOS. 50-317 & 318 1.
Docketed information available to the staff does not adequately address the following areas.
Please discuss how your design confonns 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 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).
5 - The instrumentation and control systems provided to initiate CVI should be designed and qualified as safety-grade equipment.
6 - The overriding or resetting
- of the isolation actuation signal should not cause the automatic reopening of any isolation / purge valve.
2.
Provide the scherttic drawings of ycur purge and vent system, and all other engineered safety features valves and dampers (including initiating logic).
- 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 nonnal condition.
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. 3.
Describe any manual override features that are p ovided for CVI (including post-DBA) operations.
4.
Describe all differences between the control of CVI valves and dampers and the valves and dampers of all other engineered safety features (ESF).
i 5.
If the system design of any ESF system contains an override, will the overriding of one type of safety actuation signal cause the blocking of any other type of safety actuation signal?
6.
Describe the features that are provided for bypassed and inoperable status indication.
7.
Identify each type of override and describe the physical features that are provided to facilitate administrative control.
8.
Identify the signals that initiate CVI.
9.
Upon overriding or resetting of the CVI actuation signal, will any valves automatically change position?
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