ML20039F334
| ML20039F334 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/11/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20039F291 | List: |
| References | |
| NUDOCS 8201120352 | |
| Download: ML20039F334 (2) | |
Text
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o UNITED STATES
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NUCLEAR REGULATORY COMMISSION n
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,E WASH:NGTCN, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 80.TO PROVISIONAL OPERATING LICENSE NO. DPR-21 NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION, UNIT 1 DOCKET NO. 50-245 1.0 _ INTRODUCTION AND DISCUSSION' By letter dated October 9,1981 Northeast Nuclear Energy Company (licensee) forwarded a proposed Technical Specification change that would revise reactor vessel water level measurement scales for consistent common.
reference zero level indication for all water level instrumentation The proposed Technical Specification change does not affect the reactor vessel level instrumentation used during normal plant operation. The instrument range and actual set points relative to vessel elevations ~
remain unchanged. The common proposed water level reference is 482.5 inches above the bottom of the reactor vessel. The 482.5 inch level is the zero reference for instrumentation used during normal plant operating conditions 'and therefore normal pl6nt water level measurements are not affected.
The wide range reactor vessel water level however must be changed from the current values of 0 to 400 inches to -341" to +59".
The containment spray interlock trip level scale set point.must change accordingly to -175" from +166".
Establishment of the common zero level for all reactor vessel water level instrumentation was required by item II.K.3.27 of NUREG-0737, Three Mile Island (TMI) Action Plan. The evaluation of the licensee's compliance with this requirement is provided below.
2.0 EVALUATION
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We have reviewed the proposed revisions necessary to establish a common zero level for all reactor level instrumentation. The common reference level is 482.5 inches above the bottom of the reactor vessel, i.e.,127.5 inches above the core fuel. Normal operating water level remains unchanged at 155 inches above the fuel or 27.5 inches.on the common reference scale. The proposed change to the Technical Specifications (identified above) will not change previously established safety settings and safety margins, i.e., the setpoints for instrument safety functions will not change. Since no change in actual level for any function is involved, and since no instrumentation is being modified, we find the proposed Technical Specification revisions acceptable.
8201120352 011211 PDR ADOCK 05000245 P
.- 3.'0 ENVIRONMENTAL CONSfDERATION We have det' ermined 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 impact.
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 impact statement or negative declaration and environmental impact appraisal need not be prepared in connection with the. issuance of this amendment.
4.0 CONCLUSION
We have concluded, based on the considerations discussed above, that:
(1) because the amendment does 'not involve a significant increase in the probability.or consequences of accidents previously considered and does not involve a significant 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 public will not be endangered by operation in the proposed manner, and (3) 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.
Dated:
December 11, 1981 e