ML20101K820
| ML20101K820 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/20/1984 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20101K819 | List: |
| References | |
| NUDOCS 8501020040 | |
| Download: ML20101K820 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION
' SUPPORTING AMENDMENT NO. 89TO FACILITY OPERATING LICENSE NO. DPR-51 ARKANSAS POWER & LIGHT COMPANY ARKANSAS NUCLEAR ONE, UNIT 1 DOCKET N0. 50-313 INTRODUCTION (AP& Lor Arkansas Power and Light Company (TSs)
By letter dated October 15, 1984, the licensee) requested amendment to the Technical Specifications appended to Facility Operating License No. DPR-51 for Arkansas Nuclear One, Unit 1 (ANO-1). The proposed changes would reflect, in the Technical Specifications (TSs), the actual number of instrument channels for the detection of pressurizer level, which will be available following modifications to upgrade these instruments during the sixth refueling outage.
DISCUSSION At present two pressurizer level indications are provided in the control room through the use of non-nuclear instrumentation power. The level indicators are temperature compensated through the use of a dual element RTD located in a single well in the pressurizer. Uncompensated level is provided b three-level transmitters (powered from non-nuclear instrumentation) y whose inputs come from three separate taps in the pressurizer. One level indicator is capable of being fed level and temperature signals from any of the three level and the two temperature transmitters. The second level indicator is fed level and temperature signals only from one level and one temperature transmitter. Although the existing transmitters are not independent, TS Table 3.5.1-1 currently describes this as a three. channel system.
The existing system will be replaced with two indepeno'ent channels of I
temperature compensated level indication. The new pressure transmitters and RTDs are environmentally qualified and are powered from a Class IE power source.
The proposed TS change to Table 3.5.1-1 is necessary so that the table will
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accurately reflect the number of instrument channels to monitor the pressurizer level.
EVALUATION The proposed change does not affect the minimum number of channels required to be operable or the minimum degree of redundancy required by.theiss. This is in compliance with the Babcock & Wilcox Standard Technical Specifications, reflects the recommendation for installed post-accident monitoring instrumentation
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outlined in R.G.1.97 and is, therefore, acceptable.
8501020040 841220 PDR ADOCK 05000313 P
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ENVIRONMENTAL CONSIDERATION This amendment involves a channe in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
We have determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that 1
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 this amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendnent.
CONCLUSION 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 this amendment will not be inimical to the comrin defense and security or to the health and safety of the public.
Dated:
December 20, 1984 Principal Contributors:
N. Trehan and G. Vissing
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