ML20028G879
| ML20028G879 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 08/28/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20028G876 | List: |
| References | |
| NUDOCS 9009050302 | |
| Download: ML20028G879 (2) | |
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l SAFETY EVALUATION BY THE OFFICt: OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.168 TO FACILITY OPERATING LICENSE NO. DPR-49 L
IOWA ELECTRIC LIGHT AND POWER COMPANY CENTRAL IOWA POWER COOPERATIVE CORN BELT POWER COOPERA W DUANE ARNOLD ENERGY CENTER DOCKET NO. 50-331
1.0 INTRODUCTION
By letter dated June 19, 1990, Iowa Electric Light and Power Company proposed a change to the Technical Specifications (TSs) for the Duane Arnold Energy Center. The proposed change would increase the safety limit Minimum Critical Power Ratio (MCPR) to reflect the use of General Electric GE 8X8NB-3 type fuel for the upcoming cycle 11 operation.
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2.0 EVALUATION l
General Design Criterion 10 requires that the reactor core be designed with appropriate margin to assure that specified acceptable fuel design limits are not exceeded during any condition of normal operation, including the effects of abnormal operating transients.
In order to avoid fuel damage caused by overheating of the cladding, transient consequences are limited so that more than 99.9% of the fuel rods would be expected to avoid boiling transition during a transient event. Because of this, the staff has required a safety limit stated in terms of a statistically determined Minimum Critical Power Ratio (MCPR).
The proposed safety limit MCPRs of 1.07 for two recirculation loop operation and 1.10 for single loop operation for the new GE 8X8NB-3 type fuel were determined using an NRC-approved methodology, as described in NEDE-24011-P-A, " General Electric Standard Application for Reactor Fuel,"
(GESTARII). On March 17, 1989, the NRC staff approved Amendment 21 to-NEDE-24011-P-A, which incorporated the GE 8X8NB-1, -2, and -3 fuel bundle designs into the GESTAR II document.
In the supporting safety evaluation, the staff concluded that it is conservative and acceptable to calculate the safety limit MCPR for GE 8X8NB-3 fuel using the assumptions for a C-lattice design. The actual GE 8X8HB-3 design is between a D-lattice and C-lattice geometry, and the calculated MCPR for a C-lattice is greater than that for a D-lattice configuration. The licensee used the same conservative 9009050302 900828 PDR ADOCK 05000331 P
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assumptions iii calculating the proposed MCPRs. Therefore, the staff concludes that the proposed safety limit MCPRs (1.07 for two recirculation loop operation and 1.10 for single loop operation) are acceptable for the operation of the Duane Arnold Energy Center with GE 8X8MB-3 fuel.
3.0 ENVIRONMENTAL CONSIDERATION
S This 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 or changes a surveillance requirement. The 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 is 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 4
been no public comment on such finding.
Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuantto10CFR51.22(b),noenvironmentalimpactstatementorenvironmental assessment need be prepared in connection with the issuance of the amendment.
4.0 CONCLUSI0,N The staff has concluded, based on the considerations discussed above, that: (1)
J there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (2) such activities will-~
be conducted in compliance with the Connission's regulations, and 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: James R. Hall Dated: August 28, 1990 9