ML19305B961
| ML19305B961 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/09/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 8003250401 | |
| Download: ML19305B961 (3) | |
Text
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January 9,1980 Docket Nos.: 50-282 50-306 Northern States Power Company ATTN: Mr. L. O. Mayer Manager of Nuclear Support Services 414 Nicollet Mall, 8th Floor Minneapolis, Minnesota 55401
Dear Mr. Mayer:
We have reviewed the infonnation you have submitted regarding the containment purge system on the Prairie Island Plant. We find that we need the additional information identified in the enclosure to this letter in order to complete our evaluation of the electrical overrido/ bypass aspects of the long term containment purge matter.
In order te maintain our review schedule we need the information in 45 days from the receipt of this letter.
Sincerely,
.x:s h,
4 MW.
L A.-Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors Office of Nuclear Reactor Regulation
Enclosure:
Request fo, Additional Infont.ation I
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Mr. L'. O. Mayer Northern States Power Company January 9,1980 cc: Gerald Charnoff,- Esquire Shaw, Pittman, Potts and Trewbridge 1800 M Street, N.W.
Washington, D. C.
20036 Ms. Terry Hoffman Executive Director Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 The Environmental Conservation Library Minneapolis Public Library 300 Nicollet Mall Minneapolis, Minnesota 55401 Mr. F. P. Tierney, P1 ant Manager Prairie Island Nuclear Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089 Joclyn F Olson, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 Robert L. Nybo, Jr., Chairman Minnesota-Wisconsin Boundary Area Commission 619 Second Street Hudson, Wisconsin 54016 C1arence D. Fierabend U. S. Nuclear Regulatory Commission P. O. Box 374 Red Wing,' Minnesota 55066 I
b RE00EST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VEINTING SYSTEM FOR PRAIRIE ISLAND UNIT 51 & 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 areas.
Please discuss how your ESF design confonns with each:
1 - The overriding
- of one type of safety actuation signal (e.g.,
radiation) should not cause the biccking 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 orevided for the containment isolation system and for every safet system impacted when an override is active.
4 - Diverse signals should be provided to_f.nitiate -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-intiate -
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 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 tne radiation monitors that initiate CVI are Class 1E or not.
If tney are not justify their use for a required safety function.
I
'ine following cefinitions are given for clarity of use in this issue:
Override - tne signal is still present, and it is blocked in order to perfcrm a function contrary to the signal; Reset - the signal nas come anc gone, and the circuit is being cleared to return to the normal condition.
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