ML20207K232
| ML20207K232 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/22/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20207K207 | List: |
| References | |
| NUDOCS 8607290364 | |
| Download: ML20207K232 (2) | |
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,o SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO FACILITY OPERATING LICENSE NO. NPF-6 ARKANSAS POWER AND LIGHT COMPANY ARKANSAS NUCLEAR ONE, UNIT 2 DOCKET NO. 50-368
1.0 INTRODUCTION
By letter dated September 16, 1985, Arkansas Power and Light Company (AP&L) submitted a Technical Specification change request for Arkansas Nuclear One, Unit 2(ANO-2). The proposed change would remove the Core Protection Calculator (CPC) Type I and Type II Addressable Constants listings from the Technical Specifications. The addressable constants of the Combustion Engineering (CE) design CPCs provide a mechanism to incorporate reload dependent parameters and calibration constants to the CPC software so that the CPC Core model is maintained current with changing (core configurations and operating characteristics.
In addition, Notation 10) of Table 4.3-1 would be deleted based on the fact that the amendment which added the notation specified that the notation would be applicable only for the month of January, 1983.
There are two types of addressable constants. Type I addressable constants are the calibration constants, the sensor operability status flag and the pretrip alarm set points which are expected to change frequently during cycle operation. These constants were entered into the CPC via the CPC operator module. Type II addressable constants are related to measured physics test parameter, uncertainties, allowances and adjustments. Values are determined or confirmed during startup tests following each fuel loading and are not expected to change during cycle operation. These addressable constants are typically entered into the CPCs from diskettes.
2.0 SAFETY EVALUATION We have reviewed the safety effects of removing the CPC addressable constants from the Technical Specifications. Based on our review, we have determined
' hat the proposed change is administrative in nature and does not authorize any physical chant- 'o the plant's safety-related structures, systems or components. Any mu sfications to the addressable constants are accomplished through strict administrative procedures as required by Technical Specifications 6.8.1(g). CPC software changes involving addressable constants or software limit values are made and tested under NRC approved software change procedures and are available for HEC review. CPC modifications which result in an unreviewed safety question or a Technical Specification change including 8607290364 860722 PDR ADOCK 05000368 P
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, additions or changes to software limits on the addressable constants will require NRC approval prior to implementation. In addition, the CPC sof tware are equipped with automatic acceptable input checks against range limits that are specified by the CPC functional design requirement and CPC surveillance requirements (Technical Specification Table 4.3-1) require that the correct values of addressable constants shall be verified to be installed in each operable CPC at least once a week.
Based on these requirements, and on the tact that the NRC has previously approved the deletion of CPC addressable constants from the Palo Verde Unit 2, Waterford Unit 3 and the San Onofre Unit 2 and 3 Technical Specifi-cations, we find the proposed removal of the addressable constants and related administrative requirements from the AN0-2 Technical Specifications
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acceptable.
With respect to the deletion of Notation (10) from Table 4.3-1, we find the proposed deletion acceptable based on the fact that Amendment No. 39 to Facility Operating License No. NPF-6 for ANO-2 specified that the notation which allowed a 30-day waiver of certain reactor protective system functional tests would not be valid after January 31, 1983.
3.0 EVALUATION
SUMMARY
The staff has reviewed the proposed revisions to ANO-2 Technical Specification 2.2.2, CPC Addressable Constants; Table 2.2-1, Type I and Type II CPC Addressable Constants; the associated Bases; Table 4.3-1 and Notations; and Administrative Control 6.8.1.
Based on our evaluation given in the proceeding sections, we find these revisions acceptable.
4.0 ENVIRONMENTAL CONSIDERATION
This amendment relates to changes in recordkeeping, reporting, or administrative procedures or requirements. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(10). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
4.0 CONCLUSI0h We have 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, and (2) such activities will be conducted in compliance with the Commission'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 to this SE was L. Kopp.
Dated:
July 22, 1986
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