ML20245F099
| ML20245F099 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/04/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20245F097 | List: |
| References | |
| NUDOCS 8908140148 | |
| Download: ML20245F099 (2) | |
Text
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Ucoqjo UNITED STATES
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NUCLEAR REGULATORY COMMISSION Ta
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c?JETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO.
74 TO FACILITY OPERATING LICENSE NO. NPF-62 CLINTON POWER STATION, UNIT NO. 1 ILLIN0IS POWER COMPANY DOCKET N0. 50-461
1.0 INTRODUCTION
By letter dated May 18, 1988, the Illinois Power Company (IP), et al. (the j
licensees) requested an amendment to Facility Operating License No. NPF-62 for j
the Clinton Power Station, Unit 1.
The proposed amendment would revise Technical Specification 4.1.3.3.b.1.b to change the setpoint requirement for the control rod scram accumulator low pressure alarm from 1520 +30, -0 psig to greater than or equal to 1520 psig. This change is proposed bec-Zuse the alarm setpoints for some of the pressure switches used in the BWR5/BWR6 Hydraulic Control Units have demonstrated a teindency to drif t in a upward (conservative) direction to as-found values in excess of the specified upper limits.
2.0 EVALUATION NRC staff review has concluded that there is no safety basis for including an upper limit in the Technical Specifications for the accumulator pressure i
I switch setpoints. Adequate accumulator pressure must be maintained to ensure
- d. + the scram accumulators retain sufficient stored energy to ensure a succesu ul scram. The alarm setpoint was established to alert plant personnel i
of decreased pressure in the Hydraulic Control Unit scram accumulators. Any setpoint above the minimum setpoint of 1520 is conservative with respect to alarming upon a low pressure condition, therefore it is unnecessary to impose an upper limit in the TS for the alarm setpoint. In addition, removing the upper limit would be consistent with the recommendation prescribed in General Electric Service Information Letter No. 429. Scram accumulator pressure, as indicated by the associated pressure gauges, will continue to be verified at
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least once every 7 days in accordance with existing Technical Specifications.
l 3.0 ENVIRONMENT! CONSIDERATION j
This amendment involve: a change in surveillance requirements for the facility.
We have determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in ind(vidual 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.
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Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10CFR51.22(b),noenvironmentalimpactstatementorenvironmentalassessment need be prepared in connection with the issuance of this amendment.
4.0 CONCLUSION
The proposed change ta Technical Specification 4.1.3.3.b.1.b to revise-the setpoint requirement for the control rod scram accumulator low pressure alarm from 1520 +30, -0 psig to greater than or equal to 1520 psig is acceptable.
The change will not adversely affect the safety function of the alarm and will provide greater operational flexibility for the potential drift of the pressure switch.
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 common defense and security or to the health and safety of the public.
Principal Contributor: John B. Hickman, NRR/PDIII-2 Dated:
August 4, 1989 i