ML20028H027
| ML20028H027 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 09/25/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20028H026 | List: |
| References | |
| NUDOCS 9010050195 | |
| Download: ML20028H027 (2) | |
Text
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fl UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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SAFETY EVALU,ATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED T0 AMENDMENT NO.,g,TO FACILITY OPERATING _ LICENSE,,N0_. NPF-43 w
DETROITEDISONCOM_PAM A
((RMI-2 DOCKET N03,50,,3,4J
1.0 INTRODUCTION
- requested anet.dn.ent to the Technical Specifications (TS)y (Deco or the liter.see)
By letter d6ted July 24, 1989, The Detroit Edison Conpan appended to Fecility Operatirig License No. NPF-43 for Ferr.1-2. The proposed an+ndn.ent would revise the TS to reflect the norn.a1 fin path for containnet.t nitrogen control (vent /
makeup) and pressure control wher. cperating in operatior,el conditions 1, 2 and 3.
2.0 EV,ALUATION' Prin.ary containn:ent purge capability is provided for the purpose of renovir.g fission product activity frorn the containn. tnt atnosphere and as a backup tc hydrogen and pressure control.-- The purge syster is ccitprised of a large piping system used primarily for purgir.g and inerting and a smaller system used for nitroger. ver.t/niakeup and pressure control.
The larger purge system consists of 6,.10,' 20 ar.d 24-inch containnent isolation valves. The large purge syster. has individual supply and exhaust lir.ts for the Drywell ar.d Suppression Chanber.
The. small-purge systern has only cne line connected to the drywell and one connected to the suppressior, charrber. These'are the lines which are used during normal plant opethtion for. venting, makeup-and pressure. Automatic containtnent
-isolation cccurs~for all tte above itentioned valves on low reactor water levc1 j
and high drywell pressure. All the above velves are qualified to withstand the<
pressure following a loss of coolant accident.
The larger. purge lines are restricted for use except during cold shutdown and refueling. TS 3/4.6.1.8 allows one supply and one exhaust line open for inerting.
deinerting or oressure control provided purging through the Standby Cas Treatinent
.Systern (SGTS) is lin.ited to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> / year. TS also suspends the 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> / year tine liniit if the 6-inch purge valves are used.
During hornial plant operation only..;e smaller purge systern is used for nitrogen concentration and pressure control and nct the 6-inch purge valves.
For this reason the licensee has proposed to change the TS to reflect this operation.
s The proposed TS adds a sentence to the Liiniting Condition for Operation (LCO) in Section 3/4.3.6.1.8 that specifies nitrogen venting /nakeup and pressure ccntrol for unrestricted operation is allowed through the 1-inch purge valve and not the 6-inch purge valve.
In addition, the footnote has been changed to 9010050195 900925 ADOCK0500ggi PDR
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~2-reflect'that the 6-inch purge valve is now limited to 90_ hours / year.
The proposed TS also changes the Bases section of the associated TS to clarify that purging and venting through_the Reactor Building Heating Ventilating Air Conditioning System (RBHVAC) is not time limited because the basis for a time limit is' only applicable to the SGTS.
l The proposed change to the TS is more restrictise on plant operation because the time limit exemption on venting and purging through the SGTS is only applicable to the smaller 1-inch purge valves and not the 6-inch valves as currently allowed by the TS.
The use ef the 1-inch purge valves has been previously reviewed and approved by the staff as indicated in the UFSAR Section 6.2.5.2.5 and the staff-SER, NUREG-0798 Supplement 3 Appendix H.
Therefore the staff finds the proposed change to be acceptable.
The proposed change to the bases section of the TS clarifies that purging L
through the SGTS is limited to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> / year, and purging through the RBHVAC is:
l not time limited, because of the possible damage to safety related equipment and the SGTS following a LOCA when venting through the SGTS flow path.
Therefore.the i
staff finds the proposed change to be acceptable.
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3.0 ENVIRONMENTAL CONSIDERATION
This amendment-involves a change in the installation or use of a facility.
l component located within the restricted area as' defined in 10 CFR Part 20 and changes'in surveillance requirements.. We have determined that this amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents which may_be released offsite, and that there is no significant increase in individual 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.
Accordingly, this amendment meets 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 this amendment.
L 14.0~ CONCLUSION I
L 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 compliarce with the Commission's regulations, and the issuance of this amendment will riot be inimical to the common defense and security or to g
'the health and safety of the public.
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Principal Contributor:
John Stang Date: September 25, 1990 l
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