ML20206L982
| ML20206L982 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/20/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20206L971 | List: |
| References | |
| NUDOCS 8607010011 | |
| Download: ML20206L982 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO REQUEST FOR APPROVAL TO ESTABLISH CONCURRENT INSPECTION INTERVALS TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANTS UNITS 1. 2 AND 3 l
DOCKET N05. 50-259/260/296 INTRODUCTION The Technical Specifications for the Browns Ferry Nuclear Plants Units 1, 2 and 3 states that inservice examination of ASME Code Class 1, 2 and 3 l
components shall be performed in accordance with Section XI of the ASME Boiler and Pressure Vessel Code and applicable Addenda as required by 10 CFR 50.55a(g) except where specific written relief has been granted by the Commission.
Regulation 10 CFR 50.55a(g)(6)(1) authorizes the commission to grant relief upon making the necessary findings.
10 CFR 50.55a(g)(4)(ii) requires each facility to have an inspection program plan which is updated every ten years to meet the requirements of the latest approved edition and addenda of Section XI in effect 12 months prior to the start of the 120 month inspection interval.
By letters dated July 11, 1979 and December 24, 1980, the Tennessee Valley Authority (TVA) submitted a request for approval to establish concurrent inspection intervals for the three Browns Ferry Nuclear Plants.
The present inservice inspection program is based on the requirements of the 1974 Edition through Summer, 1975 addenda of Section XI of the ASME Code.
EVALUATION Section XI, subarticle IWA-2400 in the 1974 Edition specifies Inservice Inspection Intervals.
The subarticle also allows the interval to be extended for one year to permit inspection to be concurrent with plant outages.
For plants that are out of service continuously for one year or more an inspection interval may be extended for an equivalent period. To be in conformance with the applicable Code the third inspection period, first interval for Unit 1 should have begun on April 1,1984, for Unit 2 it should have begun on November 1, 1984 and for Unit 3 the third period should have begun November 1, 1984.
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The concurrent start dates requested were November 1, 1984, for the start of the third inspection period, first interval, and March 1,1988, fer the start of the second 10 year inspection interval.
These dates represent a delay of seven months in the inspection of Unit 1.
We have reviewed the request and the bases provided by the licensee. We have reviewed the operating times for the units and the applicable codes and regulations. We have determined that a common start date for the inspection period and interval has inherent administrative, technical, and cost saving advantages for both the licensee and the NRC, some of which are listed below:
(1) the same Code Edition and Addenda can, by regulation, be used as the basis for the inservice inspection program for all three units.
(2) since all three units are basically identical in design with only minor differences in installed equipment, a single document could be used to describe the program with addenda for each unit identifying specific welds and any differences between the individual unit and the master program.
(3) the change in the inspection start date for the period and interval would not decrease the assured level of safety of the units since all required tests and examinations would be performed within the allocated period and interval.
CONCLUSION Based upon the above evaluation, the staff concludes that the licensee (TVA) can adjust the scheduling of the inservice inspection programs of Unit 1, 2, and 3 to be concurrent.
The start of the third inspection period for the three units is now effectively November 1, 1984, and the start of the second 10 year inspection interval will start March 1, 1988.
Principal Contributor:
B. Turovlin Dated: June 20,1986 l
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