ML20024H077
| ML20024H077 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 05/09/1991 |
| From: | Sellman M NORTHERN STATES POWER CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20024H078 | List: |
| References | |
| NUDOCS 9105210128 | |
| Download: ML20024H077 (2) | |
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Northern States; power Cornpany 414 fkoliet Mail
%nneapo0s, Ennesota L54011927 Telephone (C12) D $500 May 9, 1991 i
j Hr'A Bert Davis Regional Administ rator, Region III U S Nuclear Regulatory Commission 799 Roosevait Road Glen Ellyn, Illinois 60137 PRAIRIE ISLAND NUCLEAR GENERATINC PLANT.
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h Docket Nos. 50-282 License Nos. DPR 42 50-306 DPR-60 Request for Regional Waiver of Compliance to Boric Acid Line He_at Tracinft Technical Sneci fication Reout rements_
i The purpose of this letter-is to confirm the results of a teleconference between Northern States Power Company and the NRC Staff on May 9, 1991, j
in which NSP requests a Regional Waiver of Cornpliance from Prairie Island Technical Specification Section 3,0.C as it applies to Section j
3.2.B.4.
Currently, both Units are at power operation.
Unit 1 is l
presently in to the 6-hour period of TS 3.0.C.1 and will need to j.
initiate an orderly shutdown to HOT SHUTDOWN conditions by approximately
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5:45 FM on May 9, 1991.
NSP requests that the requirement for heat tracin6 for the safety injection suction line from the boric acid tank to the suction of the safety injection pumps be extended to correspond to the 72-hour TS limit of the line itself,-as allowed by TS 3.2.C.3.
The basis for this request is prv,_A 1 below:
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l-The proposed vaiver of compliance is being requested in response to the failure of two heat tracing circuits required by Technical Specification 3.2.B.4.
Current Prairie Island Technical Specifications do not allow l
both circuits of heat tracing to be inoperable. Therefore,.the-requirements of Specification 3.0.C have been applied, which provides one hour to prepare to shutdown and an additional six hours to reach hot i
shutdown.
l E-This situation is the result of an inconsistency between Technical Specification action statements 3.2.C.3 and 3.2.C.4.
Antion statement l
3.2.C.3-allows one of the two required-independent flow paths for boric acid addition to the core to be inoperable for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />,- Action r
j statement 3.2.C.4 allows only one heat tracing circuit to be inoperable s
r 9105210128 910510 PDR ADOCK 05000282 p
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for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
Both heat tracing circuits inoperable places the unit in ehe motherhood ctatement 3.0.C.
Nowever, the inoperability of both heat tracing circuits only affects the operability of the acaociated boric acic supply lino, which is allowed by Technical Specifications to be out of service for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The inoperability of the heat tracing circuits does not affect any other
-plant equipment.
Therefore there is no impact on plant s a fe ty.
Because the failure of the heat tracin6' circuits does not result in the inoperability of any other plant aystems required by Technical Specifications other than the beric acid supply line, which ia allowed to be out of service for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, this request for waiver does not a sI nificant hazards consider'atlon.
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6 Those proposed changes will not change effluent types or total offluent amounts nor vill they involve an increase in power level. The re fo co,
they will not result in any significant environmental impact.
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4' Michael Sellman Flant Manager Prairie Island c: Senior Resident Inspector, NRC NRR Project Manager, NRC J E Silber $
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