ML20148D528
| ML20148D528 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 01/15/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8801250412 | |
| Download: ML20148D528 (2) | |
Text
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"d DUKE POWER GOMPANY P.O. HOx 33180 CHARLOTTE, N.o. 28249 HAL B. TUCKER Tzt.zenown vaca enaeroswv (704) 373-4531 woctaan peoptreion January 15, 1988 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555
Subject:
Catawbc Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414 Ur.it 2/ Cycle 2 Reload
Dear Sir:
This letter provides clarification to ceveral statements contained in Attachment 3 to my letter dated November 13, 1987. was the Reload Safety Evaluation (RSE) for the Catawba Unit 2 Cycle 2 core reload.
The second paragraph in Section 1.1 - Introduction, states that all applicable safety analyses were contained in either the RSE itself or in one of the three referenced safety evaluations. The three safety evaluations were associated with
- 1) the RTD Bypass Elimination, 2) the UHI System Elimination, and 3) the Low-Tave Setpoint Modification.
All references to the Low-Tave Setpoint Modification are to be deleted.
This modification was being analyzed in-house by Duke Power coincident with the formulation of the RSE by Westinghouse. The final determination to not bnplement the Low-Tave Setpoint Modification was made in October, 1987, one month after the issuance of the RSE.
Therefore, the reference to this modification was not able to be deleted.
On a separate point of clarification, RSE Section 3.2, page 7, states that "Although the overtemperature Delta-T trip provides protection for several events in the FSAR, the f(6I) function is not explicitly modelled. Therefore, no reanalysis is required for the Technical Specification change as noted in Section 4.0 and Appendix A".
The Technical Specification change noted is the change to Technical Specification page 2-8, Note 1, items (i) and (ii) which determine the value of f66I). The term f 66I) is a function of the indicated difference between top and bottom detectors of the power-range neutron ion chambers.
If axial power distribution peaks are greater than design, as indicated by the difference between the top and bottom power range nuclear detectors, the Reactor trip is automatically reduced according to the Notations in Table 2.2-1.
The conservatism provided by the reduction of the Reactor trip setpoint is not taken credit for in the safety Analyses. The statement on page 7 of the RSE points out that the fkSI) function is not taken credit for in the analyses related to the overtemperature Delta-T trips and that the proposed changes to Table 2.2-1, page 7, which af fect f 06I),
do not affect the safety analyses.
8801250412 880115
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(p U. S. Nuclear Regulatory Commission January 15, 1988 Page Two This letter provides clarification for a previous submittal, therefore no license fee is required.
If there are any further questions please advise.
Very truly yours,
- p fx Hal B. Tucker RWO/1234/sbn xc:
Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Heyward Shealy, Chief Bureau of Radiological Health South Carolina Department of Health &
Environmental Control 2600 Bull Street Columbia, South Carolina 29201 American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange, Suite 245 270 Farmington Avenue Farmington, CT 06032 MSM Nuclear Consultants 1221 Avenue of the Americas New York, New York 10020 l
INPO Records Center Suite 1500 1100 circle 75 Parkway Atlanta, Georgia 30339 i
Mr. P. K. Van Doorn I
NRC Resident Inspector Catawba Nuclear Station l
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