ML20063K332

Application for Amend to Licenses DPR-71 & DPR-62,revising Tech Specs Re Inoperable Diesel Generator,Quick Starting Periodicity Diesel Generators & Deletion of Tech Spec 4.8.1.1.1.b.Amend Fee Encl

ML20063K332
Person / Time
Site:	Brunswick
Issue date:	08/31/1982
From:	Eury L CAROLINA POWER & LIGHT CO.
To:	Vassallo D Office of Nuclear Reactor Regulation
Shared Package
ML20063K334	List: ML20063K332 ML20063K355
References
NUDOCS 8209030349
Download: ML20063K332 (3)

Text

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Sp&L Carohna Power & Light Company AUG 311982 Of fice of Nuclear Reactor Regulation ATTN: itr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 United States Nuclear Regulatory Commission Washington, D.C. 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324 LICENSE NOS. DPR-71 AND DPR-62 REVISION TO TECilNICAL SPECIFICATIONS ELECTRIC POWER SYSTEMS

SUMMARY

In accordance with the Code of Federal Regulations, Title 10, Parts 50.90 and 2.101, Carolina Power & Light Company (CP&L) hereby requests revisions to Technical Specifications (TS) for the Brunswick Steam Electric Plant (BSEP) Unit Nos. 1 and 2. The enclosed changes concern the Limiting Condition for Operation (LCO) time for an inoperable diesel generator, the periodicity diesel generators must be " quick started", and the deletion of Technical Specification 4.8.1.1.1.b.

DISCUSSION Item 1:

Under current BSEP Standard Technical Specifications, a diesel generator may 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 /> before shutdown of both units is required. Under the proposed BSEP Technical Specifications, a diesel generator may be out of service for seven days before shutdown of both units is required.

Custom Technical Specifications, under which the Brunswick Plant was licensed, had allowed operation of both units for sevcn days with the loss of one diesel generator. The basis for this (Custom TS 3.9) was, "One of the f required diesel generators may be allowed out of service based on the ff )()[

availability of power from the startup transformer, and the fact that three diesel generators carry sufficient engineered safety feature equipment to 4)(6c I cover all breaks."

8209030349 820831 PDR ADOCK 05000324 P PDR 411 Fayetteville Street

• P. O. Box 1551

• Rateigh, N. C. 27602

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D. B. Vassallo ,

The safety design basis for the standby AC power supply system states the following in Sectien 8.11.2 of the BSEP FSAR (Section 8.3.1.1.6.1 in the Updated FSAR):

The system is designed so that the failure of any single piece of equipment, including a diesel generator, circuit breaker, distribution center, or interconnecting wiring or cabling will not jeopardize the effectiveness of core standby cooling systems.

Diesel capacity is such that any three of the four diesels provided can supply all required loads for the safe shutdown of one unit and a design basis accident on the other unit without outside power.

Based on the above, the current plant design is capable of safely responding to a design basis accident concurrent with a loss of offsite power with one inoperable diesal generator. Additionally, the probability of an event occurring with one diesel generator inoperable during a seven-day LCO is remote.

Item 2

! Under the current BSEP Technical Specifications, each operable diesel generator must be " quick started" within two hours and once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter when one diesel generator is inoperable. Under the proposed BSEP Technical Specifications, each operable diesel generator must be " quick started" within four hours and once every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereaf ter when one diesel generator is inoperable.

Carolina Power & Light Company believes the TS requirement that each operable diesel generator must be " quick started" every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when one diesel generator is inopcrable is overly conservative; it necessitates an excessive number of quick starts which may reduce the long-term serviceability of the diesel generators. The enclosed TS revisions reflect an increased interval for quick start tests which CP&L believes is sufficient to demonstrate diesel generator operability.

Item 3:

i Carolina Power & Light Company has reviewed TS 4.8.1.1.1.b, General Design Criterion 17 of 10 CFR 50, Appendix A, and the applicable bases for electrical power systems. We have concluded that TS 4.8.1.1.1.b concerns the offsite transmission network coming into the switchyard. Brunswick Steam Electric Plant Unit Nos. I and 2 have four separate, constantly energized transmission lines supplied to each unit. Based on the above, a surveillance

D. B. Vassallo test requirement to switch to a backup power source is inappropriate as the intent of TS 4.8.1.1.1.b is met on a continuous basis. The TS revisions enclosed reflect the delei:Lon of this Surveillance Requirement.

CONCLUSION Based on the foregoing discussions, CP&L requests: (1) revision of the TS requirement that an offsite circuit or diesel generator must be returned to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; (2) revision of the TS requirement that diesel generators must be " quick started" once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> with one offsite circuit or one diesel generator inoperable; and (3) deletion of the inappropriate TS Surveillance Requirement to switch from the offsite transmission network to a backup power source to demonstrate power source operability.

ADMINISTRATIVE INFORMATION Please find enclosed the revised pages for the proposed BSEP Unit Nos. I and 2 TS with changes indicated by vertical lines in the right-hand margins. In accordance with 10 CFR 170.12(c), we have determined this request constitutes a Class III and Class I amendment as it involves a single technical issue. Our check for $4,400 is enclosed as paynent of these amendment fees.

Should you have eny questions concerning this cubmittal, please contact our staff.

Yours very truly, d

4 L.W. Eury /

Senior Vice Pregitlent Power Supply Group MSG /ce (435CSIS)

Enclosures cc: Mr. D. O. Myers (NRC-BSEP)

Mr. J. P. O'Reilly (NRC-RII)

Mr. J. A. Van Vliet (NRC)

L. W. Eury, having been first duly sworn, did depose and say that the information contained herein is true and correct to his own personal knowledge or based upon information and belief.

4 0'91 /MdAdW My commission expires: OCT 041986 N tary Sea g.

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