ML19340A936

Forwards IE Circular 77-02, Potential Heavy Spring Flooding. No Response Required

ML19340A936
Person / Time
Site:	Dresden, Quad Cities, Zion
Issue date:	02/18/1977
From:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Brian Lee COMMONWEALTH EDISON CO.
References
NUDOCS 8009090889
Download: ML19340A936 (1)

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' CENTRAL. FILES UNITED STATES NUCLEAR REGUj.ATORY COMMISSION REGION 111 799 ROOSEVELT ROAD GLEN ELLYN. ILLINOIS 60137 r

FEB181MT Commonwealth Edison Compan Docket No. 50-10 ATTN:

Mr. Byron Lee, Jr.

Docket No. 50-237 Vice President Docket No. 50-249 P. O. Box 767 Docket No. 50-254 Chicago, Illinois 60690 Docket No. 50-265 Docket No. 50-295 Docket No. 50-304 Gentlemen:

The enclosed IE Circular No. 77-02 is forwarded to you for information and action.

If there are any questions related to your understanding of the actions indicated, please contact this office.

Sincerely, 1

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James G. Kcppler Regional Director

Enclosure:

IE Circular No. 77-02 cc w/ encl:

Mr. B. B. Stephenson, Station Superintendent Mr. N. Kalivianakis, Station Superintendent Mr. J. Bicel, Plant Superintendent Central Files Reproduction Unit NRC 20b PDR Local PDR Anthony Roisman, Esq.,

Attorney oWT!>t e

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9 IE Circular No. 77-02 February 18, 1977 9

e' POTENTIAL HEAVY SPRING FLOODING DESCRIPTION OF CIRCUMSTKICES:

The purpose of this circular is to inform you that the National Weather Service has predicted that heavy spring flooding in the area from the Missouri River castward is likely to occur.

Ice covers most of the major river and lake systems in this area and the accumulation of ice and snow in the eastern portion has fur-ther increased the flooding potential.

In some areas the poten-tial spring flooding may equal or exceed floods of record. The degree of flooding is dependent upon the rate of war =ing trends, ice breakup rates and the occurrence of spring rains. The two enclosed figures from the National Weather Service indicate the principal frozen rivers and areas of greatest flood potential in -

the northeast and upper cidwest.

There will also be the possi-bility'of flooding on the Mississippi River below Cairo, Illinois dependent upon runoff in its tributaries.

The enclosed maps do not address the potential of the associated effects of ice impact and blockage or additional precipitation on flood related concerns.,

ACTION TO BE TAKEN BY LICENSEE:

It is recommended at this time that licensees receiving this circular reconsider the following items in preparation for potential flooding and the associated effects at operating facilities.

1.

The potential high water level at your facility (ies) caused by runoff and/or ice jams, coupled with spring rains with respect to the site flooding conditions utilized in the design of the facility.

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2.

The potential consequences of ice impacts on exposed structures and facilities.(such as intake structures, trash racks and trav-eling screens).

3.

The potential for ice blockage in the form of ice blocks, frazil

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ice (concentration of ice crystals in the water) and/or anchor ice (bottcm ice) which could hinder the supply of safety related service water.

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IE Circular No. 77-02 February 18, 1977 J

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If any special barriers and/or procedures are needed to offset the conditions of 1, 2 or 3 above, these should be =ade ready for installation and/or implementation if the need arises.

In addition, renewed attention should be given to established pro-cedures or actions required to mitigate these conditions should they occur.

Operating personnel should review procedures prior to implementation.

5.

During the extreme cold weather there is also a potential for loss of transmission lines due to icing.

In addition, should flooding occur when varmer weather returns the potential for loss of offsite transmission lines may be increased. Therefore you should evaluate the adequacy of diesel fuel supplies for onsite power sources. This should include consideration of whether diesel supply sources and transportation routes are vulnerabic to such flooding and if there is a need for any additional onsite storage.

i 6.

Based on experience in previous flood conditions, nonsafety related facilities or components vulnerable to flooding can cause abnormal plant operations for extended periods of time.

Licensees should prepare for such situations.

At this early date, it is not possible to predict the specific time of occurrence, location, or extent of flooding or associated effects.

Forecasts regarding flooding or icing can be obtained from the public service forecasters of the U. S. Weather Service Forecast Center in' your state. These offices are generally open 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per day. The offices (in the subject area) are advised of river conditions by River Forecast Centers located in Cincinnati, OH; Harrisburg, PA; Hartford, CT; and Kansas City, MO.

This circular requires no written reply; however, as needs dictate there may be further follow-up action by the NRC. This further action may take the form of site visits to certain facilities for firsthand observa-tion of existing conditions.

If such action is initiated individual licensees will be contacted in advance.

Approval of NRC requirements for reports concerning possible generic problems has been obtained under 44 U.S.C. 3152 from the U.,S. General Accounting Office.

(GAO Approval B-180255 (R0072), expires 7/31/77).

Attachments:

Two Maps from the National Weather Service

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