ML19351F282

Responds to IE Bulletin 80-24 Re Water Leakage Inside Containment.No Significant Leakages of Cooling Water Inside Containment Identified

ML19351F282
Person / Time
Site:	Cooper
Issue date:	12/15/1980
From:	Pilant J NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-80-24, LQA8000446, NUDOCS 8101120138
Download: ML19351F282 (3)

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December 15, 1980 SW-298 Mr. Karl V. Seyfrit, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV

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611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Subject:

IE Bulletin No. 80-24 Prevention of Damage Due to Water Leakage Inside Containment

Dear Sir:

In accordance with the requirements of IE Bulletin No. 80-24, we are responding to the required Licensee Actions. Cooper Nuclear Station is a General Electric Boiling Water Reactor with a Mark I Containment and has no open cooling water systems inside the containment. There have been no significant instances of cooling water leakage into containment.

In the event of leakage, all water would be directed to the floor drains.

The floor drain sump has two high level alarms. If, for some reason, these level devices fail and the sump overflows, water would enter the equipment drain sump which also has two high level alarms. These sumps are manually pumped down once per shift to verify pump operability and any significant water accumulation would be noticed by the operating staff. Flow switches in the containment closed cooling loop are of the guarded type that do not allow leakage if they fail.

In the event of a major system failure that went undetected by level monitoring devices in the drywell sumps, the amount of water accumu-lation described in the subject bulletin could not be achieved. Due to the design of the torus vent headers to the drywell, the maximum amount of water accumulation in the drywell would be 2'-2". Any additional water would drain into the torus and be monitored by the two independent ,.

torus level switches. The only major equipment that would be affected by this water level would be the recirculation pump suction piping.

Approximately 10 inches in height of the exterior surface would become wetted. The insulation for this piping meets the applicable specifi-cations for low leachable chlorides.

Approximately 15 manhours were spent in the preparation of this report.

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t o i t i I Mr. Karl V. Seyfrit t

December 15, 1980 i

Page 2.

If there are any additional questions or comments, please feel free to

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Sincerely, M

] Pilant j Director of Licensing j and Quality Assurance J

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Mr. Karl V. Seyfrit December 15, 1980 Page 3.

STATE OF NEBRASKA )

) ss PLATTE COUNTY )

Jay M. b.lant, being first duly sworn, deposes and says that he is an authorized representative of the Nebraska Public Power District, a public corporation and political subdivision of the State of Nebraska; that he is duly authorized to submit this information on behalf of Nebraska Public Power District; and that the statements in said application are true to the best of his knowledge and helief.

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M y'M. Pilant Subscribed in my presence and sworn to before me this /8 day of December, 1980.

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/ NOTARY PUBLIC /

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