ML20039G995
| ML20039G995 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 01/08/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20039G993 | List: |
| References | |
| TAC-47493, NUDOCS 8201190395 | |
| Download: ML20039G995 (2) | |
Text
s SAFETY EVAL.UATION BY THE OFFICE OF fluCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 11 TO LICENSE HPF-9 DUKE POWER COMPANY INTRODUCTION By letter dated January 4,1982, the licensee requested a change to the McGuire Nuclear Station Unit 1 License HPF-9. Technical Specification 3.2.3, RCS Flowrate and Nuclear Enthalpy Rise Hot Channel Factor. The proposed one time change would add a note to Figure 3.2-3 to str.te:
" Operation above 90% Rated Thermal Power (RTP) may proceed for no more than 48 cunulative hours provided RCS total flow as measured by pre-cision heat balance is greater than 395,850 gpm."
The proposed change is a teirporary measure in order to escalate to full power operation to verify the full power capability of the anit and the performance of the mdel D steam generator.
EVALUATION:
The current technical specification requires that the co.nbination of the indicated reactor coolant system (RC5) flow rate, power and the measured F value be within the inllowable operating ranges shown in Figure 3.2-3 of the technical specification for 4 loop operation Figure 3.2-3 was established by including 3.5% of flow measure-ment uncertainty and, therefore, requires, for 100% power operation, a minimum RCS flow of 1403,650 gpm tahich is 3.5% above the thermal design flow (TDF) of 390,000 gpm.
The 3.5% uncertainty allowance is designed to permit surveillance requireacnts to be accoaplished utilizing the control board indication for RCS flow rate. Durinkthe full power' verification test, the flow rate is measured by a precision heat balance.
The uncertainty of this calorimetric flow measurement is 1.5% for 4 loop operation as.
indicated in attachacnt 1A of the licensee's January 4,1982 letter. Therefore, to maintain the TDF of 390,000 gpm, the minimum calorimeter neasurad flow rate require-ment would be 395,850 gpm. This flow requirement will be followed during the full power verification test which will last no more than 48 cumulative hours. Based on our review, we conclude that the requested technical specification change does not result in a reduction in safety and is acceptable.
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. ENVIRONMEfMd. CONSIDERATION We have determined that the amendment does not authorize a change in effluent types or total amounts nor an increase in power level and will not result in any significant environmental inpact. Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact and, pursuant to 10 CFR Section 51.5(d)(4), that an environmental inpact statement or negative declaration and environmental inpact appraisal need not be prepared in connection with the issuance of this amendment.
CONCLUSION We have concluded, based on the consideration discussed above, that: (1) because the amendment does not involve a significant increase in the probability or con-sequences of accidents previously considered and does not involve a significant
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decrease in a safety margin, the amendment does not involve a significant hazards consideration (2) there is reasonable assurance that the health and safety of the puHic will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in cot.pliance with the Commission's regulations and the issuance of this amendment will not be inimical to the connon defense and security or to the health and safety of the public.
Date: January 8,1982 Principal Contributors:
Y. Hsii, CPB L. Phillips, CPB R. Birkel. L8 #4
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