ML20054C089
| ML20054C089 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 04/15/1982 |
| From: | Wells R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 16609, NUDOCS 8204200019 | |
| Download: ML20054C089 (3) | |
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e r;O Y consumers Power James W Cook C0gpY Vice President - Projects, Engineering Esnpull and Construction General of fices: 1945 West Pernell Road, Jackson, MI 49201 * (517) 78& O453 April 15,1982 p-
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Ilarold R Denton, Director Y%
Office of Nuclear Reactor Regulation
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' l LICENSING OF OPERATION PERSONNEL FILE:
0926.3 SERIAL:
16609 The information below is supplied for your use in determination of the Consumers Power request for dual unit licenses for operating personnel on Midland Units 1 and 2.
It is our understanding that. such practice is normal where the units such as Midland are considered identical. We believe this information adequately justifies the dual unit operating licenses.
1.
Similarity of Operat.ing Procedures Separate procedures are provided for each unit for system operation, startup/ shutdown, alarm response, and emergency /off normal conditions.
The procedures are functionally identical for both units because the equipment is identical although some minor differences exist. due to different equipment ID numbers anj text. phraseology. The emergency /off normal procedures are not yet written but it. is our intent to make them identical, except.for equipment ID numbers, and the information t.o be memorized by operators will be identical. The procedures will be written based upon a common ATOG, INPO writers guide, and Iluman Factors considerations.
2.
Similarity in Response Characteristics i
Operating and transient response characteristics due to nuclear and NSSS hydraulic considerations will be virtually identical, differing only within design and manufacturing tolerances. The effects of secondary side imposed transients on Control Room operator actions will be the same for l
both units.
l 3.
Technical Specifications It is our intent to have a common set of Technical Specifications, reflect.ing identical primary and primary support. systems.
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Control Room Design The common control room uses a modified mirror image configuration in a side-by-side arrangement. Units 1 and 2 share a common panel (OC10/20) located between the two units. Even though units 1 and 2 are configured as mirror images, the face of each individual panel is arranged the same for both units.
For example, 2C12 and IC12, reactor coolant panels, have the same arrangement. They are not mirror images. This feature will greatly simplify the task of an operator who has shif ted from one unit to the other. There is essentially no chance of confusion for a qualified operator.
When the correct panel has been located, all indications and controls will be in their familiar location.
Separation distance between the two units is sufficient to prevent confusion in operations.
Space of 22 feet between units 1 and 2 control panels is physically divided by the OC10 " island" and the winged central operator's desk.
An in-line configuration of the two control rooms forms relative long, narrow room with low ceilings.
The net effect is to a
fairly well isolate the two control rooms from mutual interference. With disciplined teams operating each unit, there is no evidence to suggest that colocation will be detrimental.
On the other hand, when coordinated action between the two units is required, the arrangement will be a definite advantage.
Since both plants must share common cooling water services, these cooling systems can affect both plants at the same time.
Colocation will aid supervisors in making decisions and directing actions in both plants.
In case where one unit has difficulties but the other unit does not, there is an opportunity for one unit team to provide assistance to the other, 5.
Similarities in System Designs Most major systems are virtually identical on both units from an operating standpoint. These systems include:
reactor coolant incore monitoring containment heat removal offsite power containment isolation onsite power combustible gas control fuel transfer and handling emergency core cooling service water containment spray fission component cooling water product control reactor protection demineralized water ESFAS and ECCAS borated water safe shutdown outside the chilled water control room fire protection miO482-0851al31
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safety-related displ.ay
_' 4 ins.trumentation emergencp diesel generators and 1
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1-Shbufety con' trol (ICS, CRDCS, main steam j
Md6irm 'pntrol, computer, a
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feedwater pr.essurizer control, loose parts
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smohitoring, boron monitoring) condensatei s
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a l, rdel'eht instrude'ntation apxilia ry;. feedwa ter i
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j It may be noted that in the FSAR these systems have a' single description i
whichsla,applicabletobothur{lts. The only major systems that are diffqrent' atn the main turbinergenerator and transformer, which differ mainly in siyclbut'otherwise are the same in configuration and required operator a$ tion. The Process Steam System is a common system and can be i.
extraction'-steam ta' the Process Steam System.
supplied-from either.sunit.
Unit I has the capability. of supplying turbine Theothermajorconsidehationistheshorttimeframebetweenscheduled 1
styrtup of the units,.
The preseni schedule provides for lek than six months between the startup of the"two units.
It is our intant to keep this time between startups constant even if othertaupects; of the schedule.
g are revised,
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,.i For the above reasons, it in uw.uclief that dual operatorlicenses are appropriate. Your concurrence p Yequested.
Plea (esadviye iff further A, D information is needed.
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