0CAN039507, Forwards Proposed TS Changes Re ECP
| ML20082A741 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/28/1995 |
| From: | Mims D ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20082A743 | List: |
| References | |
| 0CAN039507, CAN39507, NUDOCS 9504040211 | |
| Download: ML20082A741 (3) | |
Text
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s Entergy opsrations, Inc.
-=r~ ENTERGY i443ss 333 Rutscilm AR 72801 Tel 501853-5000 e-March 28,1995 0CANO39507 U. S. Nuclear Regulatory Commission Document Control Desk Mail Station PI-137
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Washington, DC 20555
Subject:
Arkansas Nuclear One-Units 1 and 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 Proposed Technical Specification Changes Related To The Emergency Cooling Pond Gentlemen:
Attached are changes revising the Bases associated with Arkansas Nuclear One - Unit 1 (ANO-1) Technical Specification (TS) 3.11 and Arkansas Nuclear One - Unit 2 (ANO-2) TS 3/4.7.4. The changes are intended to clarify the requirements associated with the ANO emergency cooling pond (ECP).
l During the ANO Service Water System Operational Performance Inspection (SWSOPI) l conducted July 25-29 and August 8-12, 1994, a violation was identified concerning an inadequate safety evaluation associated with an apparent increase in the required ECP level i
from that specified in the ANO-1 and ANO-2 licensing bases.
The revised ECP Peak Temperature and Inventory Loss Analysis Summary calculation credits operator actions, via the plant procedures, to provide additional ECP inventory above the minimum five feet required by TS 3.11 and 3/4.7.4, for ANO-1 and ANO-2, respectively.
Given the assumptions in the analysis, a five foot level in the ECP without further operator action will provide 26.6 days of ultimate heat sink cooling. This reflects a revision in the passive 30 day design and licensing basis requirement. The credited actions require that the service water discharge, for ANO-1 and ANO-2, be aligned to the ECP upon lake level falling below 335 feet. The actions also require that the service water suction not be aligned to the ECP until service water bay level reaches a pre-determined lower setpoint. The analysis concluded that even under worst case accident conditions adequate time existed to assure the availability of a 30 day ECP inventory. The actions to increase ECP inventory are allowed by Regulatory Guide 1.27, Revision 1, " Ultimate Heat Sink for Nuclear Power Plants," as an alternate means of meeting the required 30 day inventory.
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- March 28,1995 0CAN039507 Page 2 A subsequent safety evaluation of the changes associated with the calculation was completed on January 16,1995. The evaluation determined that although no unreviewed safety question existed, changes to the Bases of the ANO-1 and ANO-2 TS were required to clearly reflect the dapaaAw4 upon operator actions to assure a 30 day ECP inventory.
In the ANO response to the October 6,1994 Notice of Violation, response dated November 4,1994, ANO committed to update the TS Bases for both ANO-1 and ANO-2 to clearly reflect the dependence upon operator actions to assure a 30 day ECP inventory. This submittal completes our commitment to submit the appropriate TS Bases changes by March 30,1995.
The proposed change to the ANO-1 and ANO-2 Bases adds a statement describing the actions required when transferring the service water system from the lake to the ECP and the bases for the required actions to assure a 30 day ECP inventory.
As these are changes to the Bases of the Technical Specifications, a "No Significant Hazards Determination" is not required. A review of the changes in accordance with 10 CFR 50.59 has concluded that no unreviewed safety question exists.
We request that these changes be issued with the next sc% lad amendment. Should you have any questions regarding these changes, please contact me.
Very truly yours, T
8 Dwight C. Mims Director, Licensing i
DCM/cws l
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U. S. NRC t
~ March 28J 1995 OCAN039507 Page 3 cc:
Mr. Leonard J. Callan Rag %A Administrator U. S. Nuclear Regulatory Commission.
Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One 1448 S. R. 333 Russellville, AR72801 i
Mr. George Kalman NRR Project Manager Region IV/ANO-1 & 2 U. S. Nuclear Regulatory Commission.
NRR Mail Stop 13-H-3 One White Flint North 11555 Rockville Pike Rockville, MD 20852 r
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