ML20125D945
| ML20125D945 | |
| Person / Time | |
|---|---|
| Site: | Point Beach, Prairie Island  |
| Issue date: | 12/17/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001210284 | |
| Download: ML20125D945 (3) | |
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- y-w DISTRIBUTION
Central Files NRC PCR PSB Reading DEC l 7 1979 MEMORNICUl1 FOR:
A. Senwencer, Chief
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Operating Reactors Branch il Division of Operating Reactors FR0!i:
G. Lainas, Chief Plant Systems Branen Division of Operating Reactors
SUBJECT:
RECUEST FOR ADDITIONAL INFORMATI0tl - C0tiTAINfCT PURGE SYSTE.'1 - PRAIRIE ISLAtlD UtlITS 1 & 2 (TAC 10156)
Plant : lame: Prairie Island Units 15 2 Cocket sics. : 50-282/306 Project Manager:
M. Grotenhuis Review Status: Awaiting Infor ation Plant Systems Branch has identified the enclosed additional information as being required within 30 days in order that we can conolete our evaluation of the electrical override / bypass aspects of the containment purge matter en senedule.
\\s G. Lainas, Chief Plant Systems Branen Division of Operating Reactors
Contact:
R. Scnoll, X27152 Enclosure :
Request for Additional Information cc w/ enclosure:
D. Eisennut J. Xerrigan W. Gamill G. Knighton 90023208 L. Nicnols V. Noonan G. Lainas F. Wi tt E. Reeves J..Zudans E. Adensam J. Kni gh, t,
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Enclosure REOUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VEINTING SYSTEM FOR PRAIRIE ISLAND UNITS 1 & 2 00CXET NOS. 50-282/306 1.
With the exception of the containment ventilation isolation (CVI) system, the docketed information as to the design of Engineered Safety Features (ESF) does not adequately address the following a reas. Please discuss how your ESF design confoms 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 the containment isolation system and for every safety system impacted when an override is active.
4 - Diverse signals should be provided to initiate isolation of the containment ventilation syste;n.
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 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.
- The following cefinitions are given for clarity of use in this issue:
Override - the signal is still present, and it is blocked in order to
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perform a function contrary to the signa 1; Reset - the signal has come and gone, and the circuit is being cleared to return to the normal condition.
90023209-
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. 2.
Provide the process and instrumentation (P&ID) and schematic drawings for your purge and vent system and control room heating, ventilation and air conditioning system.
3.
With regard to Criterion 4 of question 1 above, justify not providing for containment ventilation isolation on high containment pressure.
4.
With regard to Criterion 5 of question 1 above, please indicate if the radiation monitors that initiate CVI are Class IE or not.
If they are not justify their use for a required safety function.
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'90023210
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