ML20096C191
| ML20096C191 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 08/27/1984 |
| From: | Conway R GEORGIA POWER CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20096C196 | List: |
| References | |
| IEB-79-01B, IEB-79-1B, NED-84-465, TAC-55633, NUDOCS 8409050150 | |
| Download: ML20096C191 (3) | |
Text
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Guargia Power Company 333 Pedmont Avenue At'.anta Georg:a 30308
. Telephone 404 526-6724 Maeg Address Post Ofbce Box 4545 At:araa. Georg;a 30302 reww&NWe R.E.Conway Sene Vice Pres @nt NED-84-465 August 27, 1984 Director of M1 clear Reactor Recplation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. M1 clear Regulatory Cbmnission Washington, D. C.
20555 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 EIMIN I. HA'ICI NUCLEAR PIANP UNIT 2 REEUEST FOR TECHNICAL SPECIFICATION RELTEF Gentlemen:
In accordance with the provisions of 10 CFR 50.90 as recpired by 10 CPR 50.59(c) (1), Georgia Ebwer Conpany hereby proposes a change to the Technical Specifications, Appendix A.to Operating License NPF-5.
The proposed charge, which is being recpested on an emergency basis, will upgrade Table 3.8.2.6-1, Primary Containment Penetration Conchctor Overcurrent Protective Devices, to reflect different current recpirements for four motors which were replaced in the carrent refueling / modification outage.
Table 3.8.2.6-1 lists trip setpoints (in anperes) for circuit breakers
~
which provide overcurrent protection for electrical penetrations into the
- primary containnent.
'Itese trip setpoints are designed to protect both the -
electrical ecpipment inside the contairunent and the containment penetration itself. f tczn overcurrent damage.
Technical Specification 3.8.2.6 reglires that the associated ecpipnent be de-energized if the trip setpoints listed in the table cannot be met.
'Ite values listed in the table correspond to the current at which damage to the electrical ecpipment could ocair, which is generally nuch lower than the current at which damage to the penetration itself could occur.
'Ite recpested change involves four penetrations, as
. detailed on the attached Technical Specifications pages.
In each case the electrical ecpipment associated with the penetration was replaced in order to meet the recpirements of I&E B211etin 79-01B, Environmental Q1alification of Electrical Ecpipment.
For two penetrations, the new ecpipment reallted in increased current values.
'Itese are penetrations serving the HPCI steam line inboard isolation value motor (current increased from 30 to 35 anps) and the main steam line drain valve motor (current increased frcan 7 to 19 anps). 'Iwo penetrations now have recbced current values as a reallt of the I&E Balletin 79-01B modifications.
'Itese are penetrations serving the "A" and "B"
recirculation loop ping discharge valve motors (215 anps and 185 amps, respectively, to 135 amps each).
8409050150 840827 PDR ADOCK 05000366 P
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Georgia Powe/ d.
U. S. M1 clear Regulatory Connission Director of M1 clear Reactor Regulation
~
Algast 27,L1984-Page 2
%ese ~ four penetrations are designed for a maxim 1m carrent of 3300 amperes. Wis value is greatly in excess of any of the new alrrent values
= reglested above.
%e. reglested changes, while.necessary (by Technical Specification 3.8.2.6)1to provide. operability.of the associated electrical eglipnent, will thus have a negligible effect on the ability of the a
. penetrations to survive an electrical fallt.
%e Plant Review Board has reviewed the proposed change and determined
'that-.it does not constit 21te an unreviewed safety glestion.
Accident probabilities and conseglences are not increased above those analyzed in the FSAR.
._%e function of the ciralit breakers is not affected by a change in
~
setpoints. As detailed above, the circuit breaker's ability to provide the reglired. electrical. fallt protection to the penetration is not adversely affected. No new accident types are created since no new modes of operation are involved.
We effect on the margin of safety as - defined in the Technical Specifications is negigible, since the change in current value reglested represents an insignificant fraction of the penetration's carrent
. rating.
his change is being reglested on an emergency basis.
While unit startup can be effected by de-energizing the eglipment associated with these penetrations, this courm of action is not desirable for several reasons.
By de-energizing the main steam line drain valve motor, the ability to spalize around. the IEIW following a reactor isolation is lost.
'Itu s, should a reactor isolation ocair while. operating in this mode, actuation of the safety / relief valves would be reglired becaise the condenser could not be re-established as a heat sink.
%is represents an undesirable challenge
-to 'an important safety system as well as a albstantial thermal cycle to the.
reactor and associated eglipment.
We reglest. this change on' an expeditious basis.
%e Plant Review Board has concluded, based on 10 GR 50.59, that plant startup is acceptable if the eglipment associated with these penetrations is de-energized,- or left at -
the existing Technical Specification value.
%e breakers can be adjusted on-line following approval of this change for. the HPCI: isolation valve and the main steam line drain.
%e recirculation pinp discharge valve motor breakers would be adjusted following the next unit shitdown, and we reglest that that portion of the change be effective at that time.
-Attached along with the proposed changes is a determination of no significant hazards and payment of filing fee.
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GeorgiaPowerd U. S. M1 clear Reg 21atory Conmission Director of M1 clear Reactor Regulation A1 gust 27,1984 Page 3 Please contact this office for further discussion if necessary.
R1ralant to the reglirements of 10 CFR 50.91, Mr. J.
L.
Iedbetter of the Environmental Protection Division of the Georgia Department of Nat11ral Resources will be sent a copy of this letter and all applicable attachnents.
R.
E.
Conway states that he is Senior Vice President of Georgia Power Company and is althorized to execute this oath on behalf of Georgia Power Conipany, and that to the best of his knowledge and belief the facts set forth in this letter are tnie.
GEDRGIA IOWER COMPANY By:
K. E. CbiWay ' "
Sworn a
bscribed before me this 27th day of A1 gust,1984.
/
e
- wic My Commission Expires July 26,1985 REB /
Encloaire xc:
H. C. Nix, Jr.
Senior Resident Inspector J. P. O'Reilly, (NRC-Region II)
J. L. Iedbetter t