ML20059G660
| ML20059G660 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/29/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20059G632 | List: |
| References | |
| NUDOCS 9311080291 | |
| Download: ML20059G660 (2) | |
Text
.
5 g
UNITED STATES i
E NUCLEAR REGULATORY COMMISSION
) *(
E
'f WASHINGTON. D.C. 20555 4001 k..v f
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 156 TO FACILITY OPERATING LICENSE NO. DPR-40 OMAHA PUBLIC POWER DISTRICT FORT CALHOUN STATION. UNIT NO. 1 DOCKET N0. 50-285
1.0 INTRODUCTION
By letter dated October 9,1992, Omaha Public Power District (0 PPD) submitted a request for changes to the Fort Calhoun Station, Unit No. 1 Technical Specifications (TS). The requested changes would modify the departure from nucleate boiling ratio (DNBR) margin during power operation above 15% rated power for TS 2.10.4, " Power Distribution Limits." Also, an administrative change is being made. Amendment No.154 granted approval for a portion of the proposed changes which allowed the required charcoal filter volumetric flew rate to between 4500 and 12000 cubic feet per minute. This safety evaluation addresses the balance of the requested changes.
2.0 EVALUATION i
Item (5) of TS 2.10.4 is on DNBR margin during power operation above 15% of rated power. The current wording for the DNB parameter of cold leg temperature in item (5)(a) has notes on the cold leg temperature by means of a (1) and an asterisk. The note for (1) states "Within the limit for Core Inlet Temperature provided in the COLR." The asterisk states " Limit not applicable during either a thermal power ramp in excess of 5% of rated thermal power per minute or a thermal power step of greater than 10% of rated thermal power."
The proposed change removes the asterisk note and thereby reinstates the requirement that the limit for cold leg temperature in the Core Operating Limits Report (COLR) is also applicable during either a thermal power ramp in excess of 5% of rated thermal power per minute or a thermal power step of l
greater than 10 % of rated thermal power.
A cold leg temperature limit less than or equal to the existing TS/COLR limits for all thermal power ramping or stepping conditions makes the TS consistent with the COLR and is more restrictive since it now does not permit the limit to be exceeded for any controlled step or ramp power excursions.
Therefore, the staff finds this revision to the TS 2.10.4 for the cold leg temperature limit to be acceptable.
9311080291 931029 PDR ADOCK 05000285 P
~
l
4 I -
A parenthesis was added to the note ** on the bottom of page 2-57c to enclose the parenthetic expression contained in that note. This is acceptable as it is an administrative change to correct a typographical error.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Nebraska State official was notified of the proposed issuance of the amendment.
The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20. The NRC staff has determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there 1: no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that the amendment involves no significant hazards consideration, and there has been no public comment on such finding (57 FR 55584). Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR l
51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or I
environmental assessment need be prepared in connection with the issuance of the amendment.
1
5.0 CONCLUSION
l The Commission has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
H. Balukjian Date: October 29, 1993 l
l l
O