ML20076E163
| ML20076E163 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/01/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20076E162 | List: |
| References | |
| NUDOCS 9108150299 | |
| Download: ML20076E163 (3) | |
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%.'.'.. + s SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR RE6ULATION RELATED TO AMENDMENT NO. 72 TO FACILITY OPERATING LICENSE NO. NPF-43 DETROIT EDISON COMPANY FERMI-2 DOCKET NO. 50-341
1.0 INTRODUCTION
By letter dated May 18, 1990, theDetroitEdisonCompany(DECoorthelicensee) requested amendment to the Technical Specifications (TS) appended to Facility Operating License No. NPF-43 for Fermi-2. The proposed amendment would revise the TS by adding a second Fuel Storage Pool Area Criticality Monitor to Table 3.3.7.1-1 of the TS.
2.0 EVALUATION The Criticality Area Monitors are designed to provide a fast alarm response to initiate local personnel evacuation in the unlikely event of an inadvertent criticality and to alert control room personnel of the situation. The proposed amendment adds a _ requirement to the TS that two fuel storage pool criticality area monitors must be operable when fuel is in the storage pool. The current TS requires only one monitor to be operable.
The second monitor is proposed to ensure that the spent fuel pool monitoring requirements of 10 CFR 70.24 "Criticclity Accident Requirements" are maintained.
The Code of Federal Regulations, Title 10, Part 70, Section 24, requires, in part, that each applicable licensee maintain in areas where specified quantities of special nuclear materials are handled, used, or stored, a monitoring system consisting of two detectors capable of detecting a criticality that produces an absorbed dose in soft tissue of 20 rads of combined neutron and gamma radiation at an unshielded distance of 2 meters from the reacting material within one minute.
The existing and new detector alarm systems have control room annunciation and a separate local audio alarm. The alarm trip set points specified in the proposed amendment have been evaluated in accordance with Regulatory Guide 8.12
" Criticality Accident Alarm Systems" and determined to be appropriate for both of the spent fuel pool,nrea criticality monitors.
A new action statement has been added to the TS to address the increase in the number of required fuel Storage Pool Criticality Monitors from one to two.
The proposed action statement requires that area surveys be performed once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if one or more monitors are inoperable. The requirement is consistent with the philosophy of the existing TS and the Standard Technical Specifications.
9108150299 910801 PDR ADOCK O'.eOOO341 P
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~2-In addition, the action statenent requires that a continous nonitor (e.g.
portable) be operable if both criticality nonitors are inoperable and fuel novenent is in progress or otherwise, suspend fuel novenent.
The proposed changes are justified based on the following:
The reliability of the Criticality Monitoring Systen for the fuel Storage Pool has been increased because an additional redundant nonitor will be required by the TS. This will ensure that two Fuel Storage Pool Criticality Monitors are appropriately naintained and operable in accordance with 10 CFR 70.24 The proposed nonitor, as well as the existing nonitor, are in conpliance with the requirenents of Regulatory Guide 8.12.
This Regulatory Guide has been generally accepted by the NRC for the design of Criticality Accident Alarn Systens.
The proposed action statenent nore accurately represents the liniting condition for operati by requiring continuous nonitoring of the subject area if both criticality nonitors are inoperable and fuel novenent is in progress.
Based on the above evaluation the staff finds proposed changes to the TS are acceptable.
3.0 STATE CONSULTATION
In accordance with the Connission's regulations, the Michigan State official was notified of the proposed issuance of the anendnent. The State official had no connents.
4.0 ENVIR0<*lENTAL CONSIDERATION The anendnent changes a requirenent with respect to the installation or use of a facility conponent 1cceted within the restricted area as defined in 10 CFR Part 20 and changes iti
- e111ance requirenents.
The staff has deternined that the anendnent invoives no significant increase in the anounts, and no significant change in tM types, of any effluents which nay be released offsite, and that there is no significant increase in individual or cunulative occupational radiation exposure. The Connission has previously issued a proposed finding that the anendnent involves no significant hazards consideration and there has been no public connent on such finding. Accordingly, the anendnent neets the eligibility criteria for categorical exclusion set forth in 10 CFR Section51.22(c)(9). Pursuant to 10 CFR 51.22(b), no environnental inpact statenent or environnental assessnent need be prepared in connection with the issuance of the anendnent.
5.0 CONCLUSION
The staff has 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 nanner, (2) such activities-
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will be conducted in conpliance with the Connission's regulations, and (3) the issuance of the anendnent will not be ininical to the connon defense and security or to the health and safety of the public.
Principal Contributor: John Stang Date: August 1, 1991 i
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