ML20065T429

Application for Amends to Licenses NPF-35 & NPF-52,revising Tech Spec 3/4.6.5.1 Re Increase in Surveillance Interval for Ice Weighing to 18 Months.Amends Will Allow Util to Perform Ice Weighing Coincident W/Refueling Outages

ML20065T429
Person / Time
Site:	Catawba
Issue date:	12/21/1990
From:	Tuckman M DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20065T431	List: ML20065T429 ML20065T436
References
NUDOCS 9012280119
Download: ML20065T429 (4)

Text

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DUKE POWER December 21, 1990 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555

Subject:

Catawba Nucicar Station, Units 1 and 2 Docket Nos. 50-413 and 50-414 Request for Technical Specification Changes (TS 3/4.6.5.1)

Increase in Surveillance Interval for Ice Weighing Gentle.nen :

Attached are License Amendment Request s to Appendix A, Technical Specifications (TS), of Facility Operating Licenses NPF-35 and NPF-52 for Catawba Nuclear Station Units 1 and 2. The requested amendments increase the required ice bed ice weight of the Ice Condenser and increase the survoillance interval for weighing ice from 9 months to 18 months. The TS Bases section is also revised to reficct these changes in TS 3/4.6.5.1.

The requested TS amendments will allow Duke Power to perform ice wolghing coincident with refueling outages and eliminate the present need for on-line ice weighing. During on-line ice weighing the. Ice Condenser baskets are twisted to ensure they are free from ice buildup and are not binding on the lattice steel support structure which could affeet weighing accuracy. Duke Power has determined that this twisting of the ice baskets results in unexpected loads on ice basket U-bolts which secure the ice baskets to their mounting bracket assemblies. These unexpected loads on the U-bolts could result in bolt failure rendering the Ice Condensor inoperable. For this reason Catawba will no longer perform on-line ice weighing using the current on-line ice weighing techniques.

To prevent unnecessarily shutting the Units down prior to their respective refueling outages to weigh ice, Duke requests that TS 3/4.6.5.1 be revised to extend the ice weighing surveillence interval from 9 months to 18 months. Current ice basket weights and actual Ice Condenser sublimation rates have been analyzed, and the existing ice beds on both Units are adequate to ensure the safety analysis limits are not violated.

Additionally, the TS required total ice weight and individual basket ice l

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U.' S. Nuclear Regulatory Commission December 21, 1990 Page 2 weights will be increased to account for a 15% sublimation rate. A 15%

sublimation rate over an 18 month period is conservative based upon Catawba's operating history.

Attachment I contains the requested TS changes. Attachment 2 contains the justification and safety analysis to support the requested changes.

Attachment 3 provides the analyt.is performed in accordance with 10 CFR 50.92 which concludes that the requested amendments do not involve a Significant llazards Consideration. The requested amendment.s have been reviewed and approved in accordance with Catawba Technical Specifications 5.5.1.2 and 6.5.2.8 and have been determined to have no adverse safety or environmental impact.

It is requested that the NRC St.aff review and approve these requested amendments by Friday, February 22,_1991. The current TS surveillance period for Unit 1 expires on Sunday, February 24, 1991 which includes the 25% extension allowed by TS 4.0.2.

Should there be any questions concerning these amendment requests or if additional information is required, please contact Mr. Robert G. Morgan at (704) 373-5196.

Very Truly Yours,

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M. S. Tuckman 12029001/rgm Attachments cci Mr. Stewart D. Ebneter Regional Administrator, Region II U. S. Nuclear Regulatory Commisslor 101 Marietta St., NW, Suite 2900

/stlanta, Georgia 30323 a

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Jl S. ' Nuclear Regulat ory Commission-

_ December 21, 1990 Page 3- -

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Mr. R. E. Martin U._S. Nuclear Regulatory Commission Hall Stop filD, OWFN Washingtr., D. C. 20555 M r . W . 'a Orders

,. , Senior NRs Resident Inspector Catawba Nucicar Station Mr. lleyvard Shoaly, Chief Bureau of Radiological llealth-South Carolina Department of Ilealth &

Environmental Control 2600 Bull-Street-Columbia, South Carolina 29201

11. S. Nuclear Regulatory Coramtssion December 21, 1990 Page 4 M. S. Tuckman, being do.1- sorn, states that he is Vlec President of Duke Power Company; t hat he :- .:thorized on the part of said Company to sign and file with the Nucle. ogulatory Commission this revision to the Catawba Nuclear Station t,1censu Nos. NPP-35 and NPF-52; and that all st at ements and matters act forth therein are true and correct to the best of his knowledge, E

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M. S. T.sekman, Vice President Subscribed and sworn to before me this 21st day of December, 1990.

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