ML20039F419

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Effects & Monitoring Procedures for Installation of Freezewall Dewatering at Midland 1 & 2
ML20039F419
Person / Time
Site: Midland
Issue date: 01/05/1982
From:
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20039F415 List:
References
PROC-820105, NUDOCS 8201120440
Download: ML20039F419 (13)
v • d • e


Text

EFFECTS AND MONITORING PROCEDURES FOR INSTALLATION OF FREEZEWALL DEWATERING AT MIDLAND UNITS 1 AND 2 i

Consumers' Power Company January 5, 1982 8201:120410 i

This is a reply to the special licensing conditions outlined in Table A.20, Part 2 (2a and 2b).

2A DOCUMENTATION OF DEFLECTIONS FROM EXISTING INSTALLATIONS This report contains results of an investigation requested by the NRC.

The purpose of the investigation was to compile documentation demonstrating that the freezewall, when acti-vated, will not adversely affect Seismic Category I structures, conduit, and pipes by causing ground heave or resettlement upon thawing.

Available information was reviewed from projects for which

' ground freezing was used and ground movement documented.

Of the cases reviewed, none are similar to this situation.

Most documented cases either provided documentation during only one segment of the project, or were in completely different soil conditions, frozen to the surface with no overburden, or for tunnel application where construction-induced settlement was monitored.

No documentation of utility monitoring was found.

Because of the high-permeability soil, as proven by numerous dewatering pump tests conducted at the site, the actual pressure on these utilities is expected to be small.

How-ever, because no documented evidence of heave for similar installations is available and the expected movement of the soil and resultant stresses in the utilities cannot be calculated at this time, the response to Section 2B outlines the areas of concern and preventive measures proposed to eliminate any stresses on safety-related utilities.

I 1

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2B MONITORING AND STRESS PREVENTION PROGRAM As stated in Part 2A, no known guidelines can be found or calculated at this time to determine a projected movement to safety-related utilities; therefore, historically proven acceptance criteria for monitoring cannot be established.

In lieu of the NRC request to provide a field monitoring program to detect movement to safety-related utilities and structures, the following alternative is proposed to elimi-nate the possibility of stress to these utilities.

AREAS OF CONCERN Figure 1 indicates the location of the freezewall, area of Q-fill, and crossings of safety-related utilities.

As indi-cated on this figure, the freezewall does not cross under or influence any safety-related structures.

Although the freezewall will abut the containment building, it will not extend under it, therefore precluding any possibility of heave for this structure.

Most of the freezewall is in-stalled in non-Q areas.

It only extends into'the Q area to form closure at the containment and, where required, to cross utilities on the southeast corner and east side of the power block.

The utilities included at these crossings are:

two sets of 26-inch service water lines, two electrical duct banks, and two sets of diesel fuel oil lines.

PREVENTATIVE MEASURES The. diesel fuel oil lines are 1-1/2-and 2-inch diameter steel pipes.

No preventive action will be necessary or taken to prevent movement of these lines, because these

-lines are in the top 4 feet of the ground surface and are therefore susceptible to normal ground frost movement.

Because of their small diameter they are more flexible and can tolerate movement due to frost heave.

To eliminate any possibility of stress on the service water lines or electrical duct bank during the freeze cycle, these utilities will be excavated within the projected influence area of the freeze wall.

The utilities will be excavated in a crib to provide a gap be. tween the utility and the soil during the freeze cycle.

After the freezewall has stabilized, the utilities will be rebedded and backfilled.

A description of the three crossing areas follows.

9

Crossing 1 Crossing 1 is composed of:

(a) One group of diesel fuel lines in the top 4 feet of the ground surface; and (b) the duct bank supply to the diesel fuel tanks.

Figures 2 and 3 indicate the utilities and crib excavation to be used in this area.' The diesel fuel lines as explained above require no preventive action.

Crossing 2 Crossing 2 is composed of:

(a) four diesel fuel lines in the top 4 feet of the surface; and (b) two sets of two identical 26-inch service water lines.

The diesel fuel lines as explained above need no preventive action.

The two sets of service water lines will be excavated as shown in Figures 4 and 5.

Crossing 3 Crossing 3 is limited to one duct bank.

This duct bank is 22 feet deep and is the only safety-related utility line in the freeze zone.

This duct bank will be excavated as shown in Figure 6 and 7.

CONTAINMENT BUILDING Figure 8 shows the interface of the freezewall at the contain-ment building.

As shown, the freezewall doen not extend under the structure.

The containment is backfilled with clean sand.

Clean, free-draining sand and high permeability materials are generally unsusceptible to frost expansion.

During freezing, water is forced out of the soil at the same rate as the freezing process, which results in a lower i

frozen water content without volume changes.

Also given the l

approximate stiffness and mass of this structure (120-foot diameter, at 10 ksf or 115,000 kips), it is evident that the influence of an approximately 3-foot-wide freeze section abutting the wall at the base _of this structure will not adversely affect its stability.

MONITORING Utilities A monitoring rod will be installed in the ground at each crib excavation and monitored to determine if ground move-l ment occurs during the freece cyule.

The monitoring will be j

for information only because the utilities will not be affected even if heaving occurs.

9 3

Containment The existing settlement monitoring program, which includes monitoring the containment building, will be modified to include additional settlement readings at various phases of freezewall operation as follows:

a.

Before formation of the freezewall b.

Just after the wall has frozen

,Just after the wall has unfrozen c.

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