ML20069H619

Application for Amends to Licenses DPR-53 & DPR-69,revising TS 4.8.1.1.1.b,extending Alternate Offsite Power Circuit Surveillance Frequency from 18 to 24 Months

ML20069H619
Person / Time
Site:	Calvert Cliffs
Issue date:	06/08/1994
From:	Denton R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20069H621	List: ML20069H619 ML20069H623
References
NUDOCS 9406130245
Download: ML20069H619 (6)

Text

i f

3 i

)

Roswux E. Durnus Ik.himore Gas and Elcrtric Commmy Cahert CIWs Nuclear hm cr Plant Vice President

'05" C'I"" 'IEN E"'E""?

Nuclear Energ'y Lusby. Maryland 20657 410 586-2200 E't. 4455 local 410 2(n4455 llahimore June 8,1994 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

Document Control Desk l

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2 Docket Nos. 50-317 & 50-318 License Amendment Request; Extension of Alternate Offsite Power Circuit Manual Transfer Surveillances from 18 to 24 Months

REFERENCE:

(a)

NRC Generic Letter 91-04, Changes in Technical Specification Surveillance Intervals to Accommodate a 24-Month Fuel Cycle, dated April 2,1991 1

Pursuant to 10 CFR 50.90, the Baltimore Gas and Electric Company hereby requests an Amendment to Operating Licenses Nos. DPR-53 and DPR-69 by the incorporation of the changes described below to the Technical Specifications for Calvert Cliffs Unit Nos.1 and 2.

DESCRilrl' ION The proposed amendment would revise the Calvert Cliffs Nuclear Power Plant Units 1 and 2 Technical Specification 4.8.1.1.1.b to extend the alternate offsite power circuit surveillance frequency from 18 to 24 months. Calvert Cliffs has been operating on a 24-month fuel cycle since July 1987 (Unit 2), and July 1988 (Unit 1), performing some Technical Specification surveillances, such as the one described here. during mid-cycle outages. This request is one of a series of proposed license amendments that would climinate the need for mid-cycle surveillance outages by extending 18-month frequency surveillances to refueling interval (nominally 24 months).

IIACKGROUND Normal offsite power is supplied to Calvert Cliffs through three 500 kV transmission lines. There is also a supplemental 69 kV offsite power source which provides 13 kV power via a 69/13 kV l

substation. The purpose of the 69 kV Southern Maryland Electric Cooperative (SMECO) power source is to act as an independent energy source for safe shutdown of the plant and to provide the ability to maintain a safe shutdown condition if no 500 kV line is available. If all three 500 kV power sources are lost, the 69 kV line can be transferred to any two 4 kV Engineered Safety Features Actuation System (ESFAS) busses, one for each unit. Additionally, if there was a complete loss of offsite power, three safety-related Emergency Diesel Generators (EDGs) could provide power for al -,

\\

., analymd accidents.

9406130245 94060s

.L o U U Oi)

PDR ADOCK 05000317 qOg A g Q\\

P PDR

Docuraen ControlDesk June 8,1994 Page 2 The 69 kV power source consists of a single buried cable from an onsite SMECO substation to 13 kV service Bus No.23 via a manual breaker. When the 69 kV line is used as one of the independent offsite circuits,13 kV service Bus No. 23 and either 13 kV senice Bus Nos.11 or 21 will be energized. The 69 kV system has a capacity of 5000 kW, and electrical indication is provided in the Control Room for bus voltage, current and power usage.

The 15. month interval surveillance demonstrates operability of the 69 kV line by shutting a manual breaker between the 69 kV line and 13 kV Bus No. 23 and shutting remotely operated breakers between the 13 kV and 4 kV busses to manually transfer unit power supply from the normal circuit to the alternate circuit.

REOUESTED CilANGE Revise Technical Specification 4.8.1.1.1.b as shown on the marked-up pages attached to this transmittal, increasing the surveillance interval from 18 months to refueling interval (nominally 24 months).

SAFIm' ANALYSIS The purpose of the 69 kV SMECO power source is to act as an independent energy source for safe shutdown of the plant and to provide the ability to maintain a safe shutdown condition if no 500 kV line is available. Upon loss of all three 500 kV power sources, the 69 kV line can be transferred to any two 4 kV ESFAS busses, one for each unit. The 69 kV line is also routinely used during scheduled outages, and the remotely operated breakers are used during normal plant operations.

Reference (a) states that for cases where 18 month surveillances do not involve calibration of instruments that perform safety functions, licensees should evaluate the effect on safety of the change in surveillance intervals which supports a conclusion that the effect on safety is small.

Licensees should confirm that historical maintenance and surveillance data do not invalidate this conclusion. Since 1983, the 18-month interval surveillance which manually transfers offsite power supply from the normal 500 kV to the alternate 69 kV circuit has been performed 10 times. One i

surveillance identified an equipment problem associated with the manual breaker closure mechanism, which was corrected.

As stated above, the manual and remotely-operated breaker are routinely exercised. Based on the surveillance history provided and the routine use of the tested equipment, we conclude that the requested surveillance extension will not affect our ability to detect degradation in the 69 kV SMECO system, and does not invalidate any assumptions in the plant licensing basis.

i DETERMINATION OF SIGNIFICANT IIAZARDS j

The proposed change has been evaluated against the standards in 10 CFR 50.92 and has been determined to not involve a significant hazards consideration, in that operation of the facility in accordance with the proposed amendments-1

Document Control Desk June 8,1994 Page 3 1.

IVould not involve a significant increase in the probabilit previouslyevaluated.

y or conquences of an accident The purpose of the 69 kV Southern Maryland Electric Cooperativ is to act as an independent energy source for achieving and mai t i ie plant if the 500 kV system is not available. Failure of the 69 kV SM n a n ng safe shutdown of the initiator for any existing accident.

increase in the probability of an accident.Therefore, the proposed change does system is not an The 69 kV SMECO system could be used to mitigate the conse a loss of primary offsite power. However the accident analyses aquenc circuits were not available, the Emergenc,y Diesel Generato ssume that if the 500 kV test results indicates the system has experienced onlpowe review of surveillance ten years. In addition, f he system is routinely used y one significant failure in the last change will result in no significant increase in the accident analysis, so this probability or consequences of an accident previously ge does not increase the 2.

Would not create the possibility of a new or different type f previouslyevaluated?

accident from any accident o

This requested increase in the interval for a 69 kV SMECO s hardware is being added to the plant as part of the p on of the plant. No will not introduce any new accident initiators. Therefore the ge. The proposed change create the possibility of a new or different type of accident f oproposed change w evaluated.

r m any accident previously 3.

reduction in a margin ofsafety?Does operation of thefacility in acc endment involve a significant The 69 kV SMECO sy electricalpower source. stem provides a margin of safety by providing an alt The proposed change does not affect the operation or de 69 kV SMECO system.

Historical surveillance data and routine use ind reduction in surveillance frequency will not adversely affect our abilit e

in the system. Therefore, the proposed change does not invol e

y to detect degradation margin of safety.

ve a significant reduction in a SCHEDULE amendment is not currently identified as having an impac

94. However, issuance of this r,

operation.

age completion or continued plant

- - - - - - - - - - - - - - -~

Document Control Desk June 8,1994 Page 3 1.

Would not involve a significant increase in the probability or consequences of an accident previously evaluated.

The purpose of the 69 kV Southern Maryland Electric Cooperative (SMECO) power source is to act as an independent energy source for achieving and maintaining safe shutdown of the plant if the 500 kV system is not available. Failure of the 69 kV SMECO system is not an initiator for any existing accident. Therefore, the proposed change does not involve an increase in the probability of an accident.

The 69 kV SMECO system could be used to mitigate the consequences of accidents involving a loss of primary offsite power. However, the accident analyses assume that if the 500 kV circuits were not available, the Emergency Diesel Generators would be used to provide power to maintain the plant in a safe shutdown condition. A historical review of surveillance test results indicates the system has experienced only one significant failure in the last ten years. In addition, the system is routinely used.

However, the SMECO system is not assumed to function in our accident analysis, so this change will result in no significant increase in the consequences of accidents previously evaluated. Therefore, the proposed Technical Specification change does not increase the probability or consequences of an accident previously evaluated.

2.

Would not create the possibility of a new or different type of accident from any accident previously evaluated?

This requested increase in the interval for a 69 kV SMECO surveillance from 18 to 24 months does not involve a significmt change in the design or operation of the plant. No hardware is being added to the plant as part of the proposed change. The proposed change will not introduce any new accident initiators. Therefore, the proposed change would not create the possibility of a new or different type of accident from any accident previously evaluated.

3.

Does operation of thefacility in accordance with theproposed amendment involve a significant reduction in a margin ofsafety?

The 69 kV SMECO system provides a margin of safety by providing an alternate offsite electrical power source. The proposed change does not affect the operation or design of the 69 kV SMECO system. Historical surveillance data and routine use indicates that the reduction in surveillance frequency will not adversely affect our ability to detect degradation in the system. 'Iherefore, the proposed change does not involve a significant reduction in a margin of safety.

1 1

SCIIEDULE This change is requested to be approved and issued by December 1,1994. However, issuance of this amendment is not currently identified as having an impact on outage completion or continued plant operation.

l

1 1

' Document Control Desk June 8,1994 Page 4 ENVIRONNIENTAL ASSESSNfENT l

The proposed amendment would change requirements with respect to the installation or use of a facility component located within the restricted area, as defined in 10 CFR Part 20, or changes to an inspection or surveillance requirement. We have determined that the proposed amendment involves no significant hazards consideration, and that operation with the proposed amendment would result in no significant change in the types or significant increases in the amounts of any effluents that may be released offsite, and in no significant increase in individual or cumulative occupational radiation exposure. Therefore, the proposed amendment is eligible for categorical exclusion as set forth in 10 CFR 51.22(c)(9).

Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment is needed in connection with the approval of the proposed amendment.

SAFE'IY CONF 5frITEE REVIEW These proposed changes to the Technical Specifications and our determination of significant hazards have been reviewed by our Plant Operations and Safety Review Committee and Offsite Safety Review Committee. They have concluded that implementation of these changes will not result in an undue risk to the health and safety of the public.

Should you have any questions regarding this matter, we will be pleased to discuss them with you.

Very truly yours, r%k i

STATE OF MARYLAND :

TO WIT :

COUNTY OF CALVERT l

I hereby certify that on the day of hl/AL

.,19M,beft e me, the subscriber, a Notary Public of the State of Maryland 9in and for

('; />1 e a t; 37Lyh personally appeared Robert E. Denton, being duly sworn, and states that he is Vice Prc66 dent of the Baltimore Gas and Electric Company, a corporation of the State of Maryland; that he provides the i

foregoing response for the purposes therein set forth; that the statements made are true and correct to the best of his knowledge, information, and belief; and that he was authorized to provide the response on behalf of said Corporation.

WITNESS my Hand and Notarial Scal:

7t_.

a Notary Public 4f My Commission Expires:

Jl/7/ULA4

/, /N

(/

g Date j

RED /JV/dlm Attachtnents: (1)

Unit 1 Marked-Up Technical Specification Page (2)

Unit 2 Marked-Up Technical Specification Page

Document Control Desk June 8,1994 Page 5 cc:

D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., NRC T.T. Martin, NRC P. R. Wilson, NRC R. I. McLean, DNR J. H. Walter, PSC l

i l

l

ATI'ACHMENT (1)

UNIT 1 TECIINICAL SPECIFICATION MARKED-UP PAGE 3/48-4 i

l l

I