ML20246E203

Requests Meeting to Review Current Status of Combustible Gas Control Sys at Facility Per 10CFR50.44.NRC Intends to Resolve Issue by Issuing Safety Evaluation Accepting Plant Design or Issue Order Requiring Compliance w/10CFR50.44

ML20246E203
Person / Time
Site:	Cooper
Issue date:	05/01/1989
From:	Holahan G Office of Nuclear Reactor Regulation
To:	Trevors G NEBRASKA PUBLIC POWER DISTRICT
References
TAC-55322, NUDOCS 8905110193
Download: ML20246E203 (6)

Text

_ _ _ - _

May 1, 1989 Docket No. 50-298 Mr. George A. Trevors, Division Manager - Nuclear Support Nuclear Power Group Nebraska Public Power District Post Office Box 499 Columbus, Nebraska 68601

SUBJECT:

10 CFR 50.44, ACTIVE COMBUSTIBLE GAS CONTROL SYSTEM - COOPER NUCLEAR STATION (TAC NO. 55322)

The staff has determined that information previously supplied by you in sub-mittals or at meetings is not adequate to resolve the outstanding issue of containment air dilution related to combustible gas control (10 CFR 50.44) at Cooper Nuclear Station. I have directed my staff to give this issue high priority so that we may reach resolution as soon as possible. In order to accomplish a speedy resolution, I am requesting that we arrange a meeting, at your earliest convenience, to review the current status of combustible gas control at Cooper. A proposed agenda for this meeting is enclosed. It is our intention to resolve this issue and to issue a safety evaluation accepting the Cooper design or planned modifications, or to issue an order requiring compliance with 10 CFR 50.44. It should be noted that the other affected licensees with BWR Mark I containments are also being requested to meet with the NRC.

The project manager and staff from the Plant Systems Branch, will contact you by telephone to make final arrangements for the meeting and to discuss the proposed agenda. If you have any questions regarding this matter, please feel free to contact the project manager, Paul O'Connor, at (301) 492-3026.

Sincerely, Gary M. Holahan, Acting Director 1 Division of Reactor Projects - III, IV, Y and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure:

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Docket No. 50-298 Mr. George A. Trevors, Division Manager - Nuclear Support Nuclear Power Group Nebraska Public Power District Post Office Box 499 Columbus, Nebraska 68301

SUBJECT:

10 CFR 50.44, ACTIVE COMBUSTIBLE GAS CONTROL SYSTEM - COOPER NUCLEAR STATION (TAC NO. 55322)

The staff has determined that information previously supplied by you in sub-mittals or at meetings is not adequate to resolve the outstanding issue of containment air dilution related to combustible gas control (10 CFR 50.44) at Cooper Nuclear Station. I have directed my staff to give this issue high priority so that we may reach resolution as soon as possible. In order to accomplish a speedy resolution, I am requesting that we arrange a meeting, at your earliest convenience, to review the current status of combustible gas control at Cooper. A proposed agenda for this meeting is enclosed. It is our intention to resolve this issue and to issue a safety evaluation accepting the Cooper de ign or planned modifications, or to issue an order requiring compliance with 10 CFF 50.44. It should be noted that the other affected licensees with BWR Mark I containments are also being requested to meet with the NRC.

The project manager and staff from the Plant Systems Branch, will contact you by telephone to make final arrangements for the meeting and to discuss the proposed agenda. If you have any questions regarding this matter, please feel free to contact the project manager, Paul O'Connor, at (301) 492-3026.

Sincerely, Gary M. Holahan, Acting Director Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Rtactor Regulation

Enclosure:

As stated cc w/ enclosure: (

See next page )

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Docket No; 50-298 Mr. George A. Trevors, Division Manager - Nuclear Support-Nuclear Power Group Nebraska Public Power District Post Office Box 499 Columbus, Nebraska 68601

SUBJECT:

10 CFR 50.44, ACTIVE COMBUSTIBLE GAS CONTROL SYSTEM - COOPER NUCLEAP, STATION (TAC N0. 55322)

The staff has determined that information. previously supplied by you in sub-nittals or at meetings is not adequate to resolve the outstanding issue of '

containment air dilution related to combustible gas control (10 CFR 50.44) at Cooper Nuclear Station. I have directed rqy staff to give this issue high priority so that we may reach resolution as soon as possible. In order to accomplish a speedy resolution, I am requesting that we arrange a rneeting, at your earliest convenience, to review the current status cf combustible gas '

control at Cooper. A proposed agenda for this meeting is enclosed. It is our intention to resolve this issue and to issue a safety evaluation accepting the Cooper design er planned modifications, er to issue an order requiring compliance with 10 CFR 50.44. It should be noted that the other affected licensees with BWR Mark I containments are also being requested to meet with the NPC.

The project manager and staff from the Plant Systens Branch, will contact you l by telephone to make firel arrangements for the rrecting and to discuss the l proposed agenda. If you have any questions regarding this matter, please feel free to centact the project manager, Paul O'Connor, at (301) 492-3026.

Sincerely,

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Gary M. Holahan, Acting Director Divisico of Reactor Projects - III, IV, V and Special Projects .

Office of Nuclear Reactor Regulation Erclosure:

As stated cc w/ enclosure:

See next page

g, i-.

' Mr. George A. Trevors ..

Nebraska-Public Power District Cooper Nuclear Station ec:

- Mr. G. D.~ Watson, General Counsel-Nebraska Public Power District

P. 0.. Box 499 Columbus, Nebraska: 68601 Cooper Nuclear Station --

-' ATTN: Mr. Guy R. Horn, Division -

Manager of Nuclear Operations P.!0. Box 98 Brownville, Nebraska .68321 Dennis Grams, Director "

Nebraska Department of Environmental Control P. O. Box 98922 Lincoln, Nebraska 68509-8922 Mr. Larry Bohlken, Chairman Nemaha County Board of Commissioners

- Nemaha County Courthouse 1824 N Street Auburn, Nebraska 68305 Senior Resident Inspector U.S. Nuclear Regulatory Comission P. O. Box 218 Brownville, Nebraska 68321 Regional Administrator,-. Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000

' Arlington,. Texas 76011 Mr. Harold Borchart, Director Division of Radiological Health Department of Health 301 Centennial Mall, South P. 0. Box 95007 Lincoln, Nebraska 68509-5007 l

1

MEETING AGENDA FOR 3 4

DISCUSSION OF PLANT SPECIFIC DESIGN OF ACTIVE COMBUSTIBLE GAS CONTROL SYSTEM I. INTRODUCTION BY NRC STAFF II. MEETING OBJECTIVE To provide sufficient design details of the Nitrogen Injection Capability for each plant to determine if the provisions are adequate to meet the intent of 10 CFR 50.44 III. AIR-CAD SYSTEM NRC staff will provide the basis for concluding that the system should i not be used for combustible gas control.

. Represents an air source per GL 84-09 guidance

. Potential misuse of system

. Impact of deinerting on course of the accident IV. LICENSING BASIS AND BWR EPG'S Reconcile any conflicts between original licensing basis and Rev. 4 '

to the BWR EPG's.

. When will CAD be used (under what system conditions)

. Is the E0P consistent with FSAR assumptions V. PLANT SPECIFIC DESCRIPTION OF INERTING SYSTEM The objective is to identify all essential components, design conditions, instrumentation, and power supply for the normal inerting system to determine under what post LOCA conditions the system could be expected to function as a combustible gas control system.

A. Syrtem/ component description  !

All components required to operate under post LOCA conditior.s should be described.

. Design specification (i.e. seismic, redundancy, quality group, l etc) for a parameter where the component has not been designed for, such as seismic, but is expected to survive, provide the basis

. Location

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l . Design pressure and temperature Maximum containment conditions for component operability should also be noted

.. Design flow rate as a function of containment pressure B. System Instrumentation Instrumentation necessary to operate the system post LOCA should be identified.

. Identify each sensor, number and location

. Location of instrument readout If outside control room, determine accessibility post LOCA

. System use of sensor output What is sensor used for (automatic valve operation? ornot)if operator information only, indicate what type of action is anticipated (flow change, system shutoff, etc)

C. Operational requirements post LOCA Identify those actions that will be required to initiate system operation and those necessary for monitoring operation. For each action, identify whether it is from the control room or at a remote site.

. Instrumentation needed for startup

. Instrumentation needed for operation

. Power supply (off site and diesel?)

D. Nitrogen capacity -(onsite and time to get added supply) l l

E. Identification of deviations from GDC 41,42, and 43 F. Modificationstoeliminatedeviationsfrom(E)  !

i G. Operational, maintenance, and surveillance history objective is to l obtain some basis for determining system availability J l

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