ML20033A921
| ML20033A921 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 11/17/1981 |
| From: | Sacramo R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.), NUS CORP. |
| To: | |
| References | |
| ISSUANCES-OLA, NUDOCS 8111300164 | |
| Download: ML20033A921 (5) | |
Text
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r UNITED STATES OF AMERICA DOCHETED U%RC NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING B R
In the Matter of
)
.'J Ui3 & SERV!CE F SECRETARv
)
DocketMNd. 50-155 OLA CONSUMERS POWER COMPANY
)
(Spent Fuel Pool
)
Modification)
(Big Rock Point Nuclear Power Plant)
)
AFFIDAVIT OF RAYMOND F.
SACRAMO
-l County of Montgomery
)
) : SS l
Sta?.e of Maryland
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I, Raymond F. Sacramo, Principal Engineer, Enginaering Mechanics Department at NUS Corporation, of lawful age, being first duly sworn, upon my oath certify that the statements and information contained in the four-page Statement concerning O'Neill Contention IB-5 are true and correct to the best cf my knowledge and belief.
Executed at Rockville, Maryland.
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, 7, Subscribed and sworn to before ne this 17th de.y of November, 1981.
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Notary Public in and'for the State of Maryland and the County of Montgomery My commission expires
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UNITED STATES OF AMERICA NUCLEAP REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD IN THE MATTER OF
)
)
Docket No. 50-155-OLA CONSUMERS POWER COMPANY
)
(Spent Fuel Pool
)
Modification)
(Big Rock Point Nuclear Power Plant)
)
STATEMENT OF RAYMOND F.
SACRAMO CONCERNING O'NEILL CONTENTION IB-5 My name is Raymond F. Sacramo.
I reside at 17204 Chiswell Road, Poolesville, Maryland.
I have been employed with NUS Cor-poration, an engineering consulting firm in Rockville, Maryland, since October 1, 1977.
My professional qualifications have been previously described and set forth in my Affidavit which was filed in connection with Consumers Power Company's Motion for Summary Disposition of Christa-Maria Contention 8 and O'Neill Contention IIIE-2.
Based on my educational background and work experience, I believe I am qualified to address the questions raised in O'Neill Contention IB-5 concerning whether stresses experienced by the materials in the Big Rock Point spent fuel pool will be accelerated by reason of the proposed expansion of the pool's capacity.
Specifically, O'Neill Contention IB-5 states:
a "The corrosion and degradation of the materials of construction of the pool, pool liner, fuel elements, and racks (for example, concrete, stainless steel, and aluminum) will be accelerated by the stresses cau-sed by expansion and, as a result, the pool and racks will not retain their integrity through the remain-ing term of the operating license."
The expended capacity at the Big Rock Spent Fuel pool will result in 248 additional storage spaces for spent fuel.
The heat generated by these additional assemblies and their effect on pool thermal environment is presented in Dr. Prelewicz's affidavit.
The results showed that the increase in bulk coolant temperature between the present pool and expanded pool configurations was approx-imately 5*F during the normal refueling cycle.
More importantly,the maximum bulk coolant temperature only increased by 2*F (to approx-imately 10l*F) for the fuel core offload condition of 84 assemblies placed in the pool.
These slight changes in coolant temperature have the following effects on the various pool materials.
For the existing racks the additional 5*F will cause a slight expansion or growth in the aluminum materials.
However, no stresses will result from the temperature increase because the racks are free standing in the pool, i.e.,
they are not fastened to the pool or pool liner.
Thus, the slight expansion or growth in the aluminum material can be accommodated without developing forces and internal structural stresses.
No accelerated stress conditions will develop for the new stainless steel racks because the effects of expanding the fuel pool, including temperature, are within the design basis of the racks.
rs I
When a structure is constructed of several materials having different thermal expansion characteristics or the structure _is i
restrained, an increase in temperature will cause stress to develop.
This is due to material growth being restrained from free expansion.
Forces are generated at the restraints causing material stresses to develop.
The interface between the pool liner and concrete walls and floor is such a structure.
The thermal expansion characteristics of the concrete and stainless steel liner are different.
Stainless steel expando nore than concrete.
Restraints at the pool walls and floor corners restrict liner growth causing compressive forces and stresses to develop through the liner.
In the case of the pool walls and floor, the effects of the temperature rise are different.
The bulk coolant temperature on the pool inside surface has increased to 10l*F for the expanded pool-configuration; however, the outside pool surface temperature has remained the same.
The result is a
.l slight increase in the thickness thermal gradient which could lead to increased stresses.
From my affidavit addressing Christa-Maria Contention 8 and O'Neill Contention III E-2, the liner and pool I
concrete were both shown to function even at the pool boiling temp-1 l
erature of 237'F.
Therefore, the slight increase in normal operat-I l
ing temperature to 10l'F represents a negligible change in liner and concrete stresses.
i Corrosion rates under the expanded pool environment were studied by and summarized in Mr. Birkle's affidavit.
The effect of corrosion 1
i, 4
1 s
is a reduction in the material cross-sectional area which leads to an increase in stresses.
Based on the negligible corrosion rates described by Mr. Birkle for the stainless steel. pool liner and racks and the aluminum alloy racks, there will be a insignificant change in stress.
Therefore, the structural integrity of the stainless steel pool liner and racks and the aluminum alloy racks is maintained.
Again referring to my affidavit addressing Christa-Haria Con-tention 8 and O'Neill Contention III E-2, the pool concrete was shown to maintain a campressive strength similar to the original 28-day aging strength level even after a prolonged pool boiling temperature condition.
Therefore, the expanded pool configuration would not degrade the concrete strength at the lower normal operating bulk temperature of 10l*F.