ML20247A490

Application for Amend to License DPR-57,revising Tech Specs to Change Reactor Coolant Conductivity Sampling When Continuous Conductivity Monitor Inoperable from Once Every 4 H to Once Every 24 H

ML20247A490
Person / Time
Site:	Hatch
Issue date:	03/20/1989
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20247A493	List: ML20247A490 ML20247A497
References
HL-325, NUDOCS 8903290132
Download: ML20247A490 (5)

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$gjb HL-325 0039V X7GJ17-H600 March 20, 1989 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D.C. 20555 PLANT HATCH - UNIT 1 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 REQUEST TO REVISE TECHNICAL SPECIFICATIONS:

CHANGES TO INLINE CONDUCTIVITY MEASUREMENT FRE0VENCY SPECIFICATION Gentlemen:

In accordance with the provisions of 10 CFR 50.90, as required by 10 CFR 50.59(c)(1), Georgia Power Company (GPC) hereby . proposes a change to the Plant Hatch Unit 1 Technical Specifications, Appendix A to Operating License DPR-57.  !

The current Technical Specifications for Plant Hatch-Unit I require reactor coolant conductivity sampling be obtained once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> when the continuous conductivity monitor is inoperable. GPC proposes a permanent Technical Specifications change to provide for changing the sampling requirements, when the continuous monitor is inoperable, from once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> in any mode of operation to once every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> when the reactor coolant temperature is less than or equal to 212*F. When the reactor coolant temperature is greater than 212*F, the sampling frequency would remain at once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

This amendment would incorporate into Unit 1 Specification 4.6.F.2 the Standard Technical Specifications (STS) surveillance frequency requirements for reactor coolant conductivity sampling when the continuous monitor is  ;

inoperable (GE-STS [BWR/4], Section 4.4.4.c. , page 3/4 4-13). GPC proposes j the current Unit 1 format remain unchanged. The amended specification also agrees with the requirements of the Technical Specifications for Plant Hatch-Unit 2 (Section 4.4.4.c) for operational conditions at less than or equal to 212*F.

Enclosure 1 provides a detailed description of the proposed change and the circumstances necessitating the change request.

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l' U. S. Nuclear Regulatory' Commission March 20, 1989 Page Two Enclosure 2 details the bases for our determination that the proposed change does not involve significant hazards considerations.

Enclosure 3 provides page change instructions for incorporating the proposed change into the Technical Specifications. The proposed changed page for Unit 1 follows Enclosure 3.

To allow time for procedure revisions and orderly incorporation into copies of the Technical Specifications, GPC requests the proposed amendment, once approved by the NRC, be issued with an effective date to be no later than 60 days from the date of issuance of the amendment.

In accordance to the requirements of 10 CFR 50.91, a copy of this letter and all applicable enclosures will be sent to Mr. J. L. Ledbetter of the Environmental Protection Division of the Georgia Department of Natural Resources.

Mr. H. G. Hairston, III states he is Senior Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Company, and to the best of his knowledge and belief, the facts set forth in this letter are true.

GEORGIA POWER COMPANY By: d. /da T H. G. Hairston, III Sworn to and subscribed before me this M day of March 1989.

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Enclosures:

1. Basis for Change Request.

2. 10 CFR 50.92 Evaluation.

3. Page Change Instructions.

c: (See next page.) l l

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- U. S. Nuclear Regulatory Commission March 20, 1989

.Page Three c: Georaia Power Comoany,.

Mr. H. C. Nix ~, Jr., General Manager - Hatch

. Mr. L. ' T. Gucwa,' Manager, Engineering & Licensing - Hatch

l. .G0-NORMS-U. S. Nuclear Regulatory Commission. Washinaton. D.C.

Mr. L. P. Crocker, Licensing Project Manager - Hatch U. S. Nuclear Regulatory Commission. Reaion II

'Mr. S.'O. Ebneter, Regional Administrator l Mr. J. E.' Menning, Senior Resident ~ Inspector - Hatch '

State of Georaia Mr. J. L. Ledbetter, Commissioner - Department of Natural Resources i

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ENCLOSURE 1 PLANT HATCH - UNIT 1 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 REQUEST TO REVISE TECHNICAL SPECIFICATIONS:

CHANGES TO INLINE CONDUCTIVITY MEASUREMENT FREQUENCY SPECIFICATION BASIS FOR CHANGE REOUEST PROPOSED CHANGE:

The proposed amendment to the Unit 1 Technical Specifications (specifically, Specification 4.6.F.2.a.1) would change the reactor coolant conductivity sampling, when the continuous conductivity monitor is inoperable, from once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> in any mode of operation to once every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> when the reactor coolant temperature is less than or equal to 212*F. When the reactor coolant temperature is greater than 212'F, the sampling frequency would remain at once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Basis for Procosed Chanae:

The request to change the reactor coolant conductivity sampling requirements when the continuous conductivity monitor is inoperable is necessary to provide relief from the 4-hour sampling requirements of the current Unit 1 Technical Specifications. This proposed change is consistent with the NRC-approved sampling frequencies established in the Standard Technical Specifications requirements for conductivity sampling (GE-STS [BHR/4],

Section 4.4.4.c. , page 3/4 4-13) .

l Adoption of the proposed change will make the requirements of the Unit 1 Technical Specifications consistent with those of Unit 2. The sampling requirements can be relaxed when the reactor coolant temperature is less than or equal to 212*F, because, at these lower temperatures, the temperature-dependent corrosion rates are lower, thereby providing more time in which to discover the abnormal reactor water chemistry condition and take corrective action. Although high conductivity in itself does not cause l

stainless steel stress corrosion cracking, it can indicate the possible presence of a high chloride concentration in the coolant. Chlorides can be a contributor to stress corrosion cracking. (Reference Unit 1 Technical Specifications, Bases Section 3.6.F, pages 3.6-18 and 3.6-19.) Since the corrosion rate is temperature-dependent, it is more important to quickly identify a high conductivity (and possible high chloride) condition when the coolant temperature is high, hence, the need for the 4-hour sampling frequency requirement when the coolant temperature is greater than 212*F.

I However, as stated previously, it is not necessary to quickly identify a high i' conductivity condition when the coolant is less than or equal to 212*F because of the lower corrosion rate at a lower temperature; hence a 24-hour sampling frequency is sufficient to discover a problem and take corrective action.

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ENCLOSURE 2 PLANT HATCH - UNIT 1 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 i REQUEST TO REVISE TECHNICAL SPECIFICATIONS: q CHANGES TO INLINE CONDUCTIVITY MEASUREMENT FREQUENCY SPECIFICATION 10 CFR 50.92 EVALUATION l

PROPOSED CHANGE: '

l As discussed in the Basis for Change Request, the proposed amendment to the Unit 1 Technical Specifications (specifically, Specification 4.6.F.2.a.1) would change the reactor coolant conductivity sampling, when the continuous conductivity monitor is inoperable, from once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> in any mode of operation to once every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> when the reactor coolant temperature is less than or equal to 212*F. When the reactor coolant temperature is greater than i 212*F, the sampling frequency would remain at once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. l Basis for Prooosed Change:

See Enclosure 1 for a detailed description of the safety basis for the proposed change. Based on that information, the following conclusions can be drawn:

o This change does not involve a significant increase in the probability or consequences of an accident, because the operation of any plant equipment or system is not affected, o The possibility of a different kind of accident from any analyzed previously is not created by this change, since the change does not affect the operation of any plant equipment or system. Therefore, no new modes of plant operation are introduced, and no new accident types can result.

o Margins of safety are not significantly reduced by this change, since the proposed change relaxes the surveillance interval only when the reactor coolant is less than or equal to 212*F at which temperature I the corrosion rate is low. Additionally the change is consistent with the Standard Technical Specifications for reactor coolant sampling when the continuous monitor is inoperable. No other Specifications are affected by this change.

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