ML20210Q446
| ML20210Q446 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/21/1997 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20210Q443 | List: |
| References | |
| NUDOCS 9708290207 | |
| Download: ML20210Q446 (2) | |
Text
.____ _____ - _ _ - -.
p*O4 9 y
t UNITED STATES u
3 NUCLEAR REGULATORY COMMISSION O
fI WASHINGTON, D.C. 30666 4001
%.....f SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATIQH RELATED TO AMENDMENT NO.161 TO FACILITY OPERATING LICENSE NO. DPR-12 AND AMENDMtNT NO.156 TO FACILITY OPERATING LICENSE NO. DPR-25 COMMONWEALTH EDISON COMPANY M QJN NUCLEAR POWER STATION. UNITS 2 AND 3 QQ gET NOS. 50-237 AND 50-249
1.0 INTRODUCTION
By letter March 18, 1997, Commonwealth Edison Company (Comed, the licensee) submitted an application for amendment to the Dresden, Units 2 and 3, Technical Specifications (TS). The proposed amendment would increase the Migh Pressure Coolant Injection (HPCI) system low reactor vessel pressure isolation setpoint in TS Table 3.2.A.1, " Isolation Actuation Instrumentation" from
" greater than 80 psig" to " greater than 103 psig." The proposed TS change will make the TS consistent with the Dresden Updated Final Safety Analysis Report (UFSAR) and the design basis documents associated with the HPCI system.
2.0 EVALUATION The purpose of the HPCI system is to maintain reactor vessel water inventory after a smali loss-of-coolant accident (LOCA) which does not depressurize the reactor vessel. The HPCI led reactor vessel pressure isolation function is provided to prevent damage to the HPCI turbine when reactor steam pressure has decreased below that required to provide adequate motive force to 09erate the HPCI turbine. The HPCI system is described in the Dresden UFSAR sLtion 6.L3.1.3.2 as being capable of delivering full rated flow down to a reactor pressure of 165 psig.
In section 6.3.2.3.3.4, the UFSAR states that HPCI isolation will occur on a HPCI steam line aressure of 100 psig. The current TS value for this isolation is 80 psig. Tie proposed TS change will correct this error and the TS will be the same as the design basis documentation for the HPCI system.
The licensee stated in their application that the low pressure isolation is not an assumed initiator or creator of any previously analyzed accident at Dresden, and the increased setpoint remains well below the reactor vessel pressure at which the HPCI system is required to perform its intended safety function. On these bases, the staff finds the proposed change to the TS acceptable.
9708290207 970821 PDR ADOCK 05000237 i
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3.0 STATE CONSULTATION
In accordance with the Comission's regulations, the 1111 mis State official was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendments change a requirement with respect to the installation or use of s facility component located within the restricted area as defined in 10 CFR Part 20.
The NRC staff has determined that the amendments involve 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 increar. in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (62 FR 17228). Accordingly, the amendments meet 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 the amendments.
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that tt 'ealth and safety of the public will not be endangered by operation in tt oposed manner, (2) such activities will be conducted in compliance with tne Commission's regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
G. Golub Date: August 21, 1997
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