ML19305A726
| ML19305A726 | |
| Person / Time | |
|---|---|
| Site: | Point Beach, Zion  |
| Issue date: | 01/15/1980 |
| From: | Lantz E Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19305A724 | List: |
| References | |
| NUDOCS 8002130109 | |
| Download: ML19305A726 (3) | |
Text
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UNITED STATES OF AMERICA NUCLEAR REGULATORY C0!EISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of
) Docket Nos. 50-295
)
50-304 COMMONWEALTH EDISON COMPANY
)
(Proposed Amendment to Facility Operating
)
License No. OPR-39 and OPR-48 to Permit (Zion Station, Units 1 and 2)
)
Storage Pool Modification)
SUPPLEMENTAL AFFIDAVIT OF EDWARD LANTZ I, Edward Lantz,being duly sworn, do state as follows:
I am employed by the U.S. Nuclear Regulatory Commission as an Engineering Systems Analyst, Plant Systems Branch.
I am respcnsible for technical reviews and evaluations of component and system designs and operating characteristics of licensed nuclear power reactors. The statement of my professional qualifications has been pre-viously filed in this matter.
This affidavit is in response to the Atomic Safety and Licensing Board question as to whether or not the water in the Zion spent fuel pool would be a " stagnant, oxygenated, borated water system," as defined by the NRC Staff on page 3 of I.E.
Bulletin No. 79-17, Revision 1, dated 29 October 1979; and whether the water inside the proposed vented fuel storage tubes would be a " stagnant oxygenated borated water system."
This definition of a " stagnant, oxygenated, borated water system" is stated in the referenced bulletin as follows:
For this review, the term " stagnant, oxygenated borated water systems" refers to those systems serving as engineered 8002130
safeguards having no normal operating functions and contain essentially air sat ated borated water where dynamic flow conditions do not exist on a continucas basis.
The spent fuel pool and the proposed vented fuel storage tubes in the racks in the pool can be considered engineered safeguards, but they do have a normal operating function.
In this respect they do not comply with this definition.
The water in the Zion spent fuel pool is essentially oxygen-saturated borated water, but it is circulated by cooling pumps and by natural convection. The cooling pumps take the hot water off of the top of the pool at one end and force it through a heat exchanger, where it is cooled, and then force it to the bottom of the other end of the pool. Natural convection circulation takes place due to having different temperature, and hence different density, water at the same elevation in adjacent regions in the pool.
The forced convection flow in the pool will have two components, an upward component and a horizontal component. The average, upward velocity in the Zion spent fuel pool without any racks or spent fuel in it due to one pump pumping 2300 gpm through it would be on the order of ten feet per hour. The average horizontal velocity would be a little larger due to the smaller flow area, but it would be the same order of magnitude.
If the flow rate is maintained at 2300 gpm, these velocities will be larger with racks and spent fuel in the pool. The more solid the material placed into the pool, i.e., the higher the fuel storage density, the larger these velocities will be for the same flow rate because of the decreased flow area.
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Iri natural circulation flow a vertical loop is established in which the water flows upward through the heat source region and downward through a cooler adjacent region. The upward velocity along a heat source is a direct function of the amcunt of heat in it. Thus,in a heat source region, i.e., a storage location with a spent fuel assembly in it, the natural circulation flow will enhance the upward, forced convection flow. Therefore, the water will not be stagnant in any storage location which has a spent fuel assembly in it. The natural circulation flow in a cooler region is dcwnward, and it therefore tends to oppose the upward forced convection flow in that region. Thus in these regions it may at times be possible for these two velocities to cancel. The result could be regions of relatively stagnant water in some local areas in the pool.
The above discussion does not relate to the water present at the interface between the Boral and its SS304 cladding. That water would be within the referenced definitions of " stagnant, oxygenated borated water."
The above statements are true and accurate to the best of my knowledge.
Eowara tant Subscribed and sworn to be' fore me this 15th day of January, 1980.
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Notary Public
/G My Comission expires: July 1, 1982 e