ML20107D056

Application for Amend to License NPF-5,changing Tech Spec 4.1.3.5.b.2 Re Hydraulic Control Unit Pressure Alarm Setpoint & Tolerance Required for Channel Calibr & Revising Table 3.3.3-1 Re ECCS Actuation Instrumentation.Fee Paid

ML20107D056
Person / Time
Site:	Hatch
Issue date:	02/15/1985
From:	Beckham J GEORGIA POWER CO.
To:	Stolz J Office of Nuclear Reactor Regulation
Shared Package
ML20107D058	List: ML20107D056
References
NED-85-056, NED-85-56, TAC-56985, NUDOCS 8502220216
Download: ML20107D056 (6)

Text

C-Georgia Power Company 333 Piedmont Avenue 4 Atlanta, Georgia 30308 Telephone 404 526-7020 Mading Address: A Post office Box 4545 Atlanta, Georgia 30302 g Georgia Power J. T. Becknam, Jr. ine sourtwn electrc system Vice President and General Manager Nuclear Operatons NED-85-056 0345y I

February 15, 1985 5

Director of N3 clear Reactor Regulation Attention: Mr. John F. Stolz, 011ef Operatirg Reactors Branch No. 4 Division of Licensing U. S. Maclear Regulatory 03rrmission Washirgton, D. C. 20555 NRC DOCKET 50-366 OPERATING LICE:NSE NPF-5 EDNIN I. HATCH NIX' LEAR PIAMP UNIT 2 HG ION PRESSURE ALARM SETPOINF AND ADS TIMER MPL NtNBER REVISION Gentlemen:

In accordance with t.he provisions of 10 CFR 50.90 as recnired by 10 CFR 50.59(c) (1), Georgia Power Coupany hereby proposes charges to the Technical Specifications, Appendix A to Operating License NPF-5.

Two changes are proposed. h first proposed charge is a revision to the Hydrallic Control Unit (HG) presaire alarm setpoint and tolerance as req 3 ired for a CHANNEL CALIBRATION per Technical Specification 4.1.3.5.b.2.

This specification currently req 11res that the HCU presaire detectors be calibrated to alarm at 955 + 15 psig. Operating experience has shown that due to .tenperature irxilced drift, this narrow tolerance (phis or mirus approximately 1.5 percent) cannot be reasonably met. We reallt is a realrriry failure of HCDs to meet the OPERABILITY reglirements of Technical Specification 4.1.3.5.a. when tested. In order to resolve this problem, we propose to change the HCU presaire alarm setpoint Technical Specification reglirement to y_940 psig. % e purpose of the HG presaire alarm is to warn of a decreasirg HCU presaire condition while preserving enough HCU presaire to meet scram time reglirements for the associated control rod when reactor-presaire is low. The lower limit of the tolerance band is the inportant limit that is preserved by the GANNEL CALIBRATION. his limit, 940 psig, is unaffected by the proposed change.

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GeorgiaPowerNh U.' S. M1 clear Reg 11atory Comission Pebruary -15, 1985 Page 2

The Plant Review Board and the Safety Review Board have reviewed this prapaaad change and determined that it does not involve an unreviewed safety siestion. Probabilities and consecalences of analyzed accidents will not be increased by this change since the minirmim HCU alarm presaire setting is uncharged. No new accident types are created since no new modes of operation are involved. h margin of safety as defined in the Technical Specifications will not be red 1ced by this charge, since it will allow the

- presaire alarms to be set at a value which redices the likelihood of instrument drift ccanpromising the lower limit of 940 psig.

The second proposed change is the revision of Table 3.3.3-1, " Emergency Core : Cooling System Actuation Instrumentation," to reflect a new Master Parts List -(MPL) mmber for the ADS timer, previously 2B21-K5 A, B. h ADS timer function has been assigned to. a new type relay in accordance with General Electric recommendations contained in Service Information Ietter (SIL) . 230. _ Relay 2B21-K5 A, B contimes to be used for the alarm function, so _ a new MPL' mmber, 2B21-K752 A, B, has been assigned to the ADS timer.

This change is parely a change' in nomenclature and does not reflect any change in plant operation or setpoints. .

The Plant Review Board and Safety Review Board have reviewed this proposed change and determined -that it does not involve an unreviewed safety glestion. Probabilities and conseq2ences of analyzed accidents are unaffected. No changes .in plant operation are involved. h margin of safety as defined in the Technical Specifications is unaffected.

Encloa2res 1 and 2 detail the analyses'of No Significant Hazards for the proposed changes.

Payment of application fees is enclosed.

In order to allow time for procedure revision and orderly incorporation into copies of the Technical Specifications, we regnest that the pi@d amendment, once approved by the NPC, be isaled with an effective date to be no later than 30 days from the date of isalance of the amendment.

R1ralant to the reglirements of 10. CFR 50.91, Mr. J. L. Iedbetter of the Environnental Protection Division of the Georgia _ Department of - Natural' Resources _ will be .sent a. copy of this letter and all gplicable attachments.

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GeorgiaPower n\

U. S. M1 clear Regt11atory Comnission Febmary 15, 1985 Page 3 J. T. Beckham, Jr. states that he is Vice President of Georgia Power Conpany and is althorized to execute this oath on behalf of Georgia Power Conpany, and that to the best of his knowledge and belief the facts set forth in this letter are tme.

GEDFGIA PO9ER CDMPANY By: r--

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-- - f-J.T.Beckham,Jr/

Sworn and albscribed before me this 15th day of Febmary,1985.

Notary Public, Georgia, Sta% at Large

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.- , My Commission Expires Sept.18,1987

/ / Notary Riblic REB /

Encloalres xc: H. C. Nix, Jr.

Senior Resident Inspector J. P. O'Reilly, (MtC-Region II)

J. L. Iedbetter 700775

i GeorgiaPowerd DCIOSURE 1 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 EDWIN I. HA'ICH NUCIEAR PIANT UNIT 2 REVISION 'IO HCU ACCLMJIA'IOR PRESSURE ALARM SETPOINP RANGE R1ralant to 10 GR 50.92, Georgia Power Company has evaluated the attached proposed amendment for Plant Hatch Unit 2 and has determined that its adoption would not involve a significant hazard. %e basis for this determination is as follows:

PEOPOSED CHANGE Revise the HCU accum11ator presaire alarm setpoint range from 955 +

15 psig to >940 psig.

BASIS This charge does not increase the probability or consentences of an accident or malfunction analyzed in the FSAR. As described in Section 4.2.3.2.2.3 of the Hatch Unit 2 FSAR, the purpose of the HCU accum11ator is to provide sufficient energy to fully insert a control rod at lower reactor presaires. (At normal operating reactor presaire, reactor presaire alone is alfficient to insert a rod.) U@r normal operating conditions, the accumilator piston is seated at the bottan of its cyliivier due to presatrization of the

- water above the piston bf the CRD punp. Should an accanulator fail to hold presaire, the nitrogen volume under the piston will expand to the point where alfficient energy is no lorger available for the HCU to insert a control rod within time reglirements at low reactor presaire. %e purpose of the HCU presaire alarm is to warn of this condition while still preserving enough energy to scram the associated control rod. Changing the alarm setpoint from 955 + 15 to 1940 psig allows the actual alarm setpoint to be moved Tn a conservative (upward) direction without violating Technical Specifications. %is change does not create the possibility of an accident or malfunction of a different type than analyzed in the FSAR, since no new modes of operation are involved. We margin of safety - as defined in the Technical Specifications is not decreased by this charge.

700775 '

l GeorgiaPowerd ENCIOSURE 2 NBC DOCKET 50-366 OPERATING LICENSE NPF-5 ENIN I. HAIG NUCJAR PIANT UNIT 2 CORRECTION OF TABLE 3.3.3-1 TO REFLECT NW MPL NtFIBER R2ralant to 10 GR 50.92, Georgia Power Conpany has evaluated the attached proposed amendment for Plant Hatch Unit 2 and has determined that its adoption would not involve a significant hazard. The basis for this determination is as follows:

PROPOSED CHANGE Revise Table 3.3.3-1 to reflect a new MPL mmber for the ADS timer relay.

BASIS The proposed change. only involves a change in namenclature. No change to plant operation is involved. Therefore, this change is consistent with Item (i) of the "Exanples of Amendments that are Cbnsidered Not Likely to Involve Significant Hazards Considerations" listed on page 14,870 of the Federal Register, April 6, 1983.

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ENCIOSURE 3 NRC D00GT 50-366

. OPERATING LICENSE NPF-5 EININ I. HA'ICH NUCIEAR PIRFF LNIT 2 PROPOSED CHAIGE 'IO TECHNICAL SPECIFICATIONS The proposed change to Technical Specifications (Appendix A to

. Operating License NPF-5) would be incorporated as follows:

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