ML20079B562

Discusses 940909 Application for Amend to License NPF-30, Revising TS 3.8.3.1 by Relocating Requirement to Maintain Tie Breakers Between Redundant Busses Open to Tables 3.3-3 & 4.3-2.Revised TS Page 3/4 3-20a Encl

ML20079B562
Person / Time
Site:	Callaway
Issue date:	12/22/1994
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20079B563	List: ML20079B562 ML20079B566
References
ULNRC-3118, NUDOCS 9501060199
Download: ML20079B562 (4)

Text

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1901 Ch6uteau Avenue y; Post Ottiw Box 149 St. Louis, Mossoun 63166 31tS54 2650 DonalJ F. Schnell Sersior Vice President l ELECTRIC December 22, 1994 nunear r jgg  ;

.U.S. Nuclear Regulatory Commission Attn: Document Control Desk i Mail Station P1-137 Washington, D.C. 20555 Gentlemen: ULNRC-3118 DOCKET NUMBER 50-483 CALLAWAY PLANT REVISION TO TECHNICAL SPECIFICATIONS 3/4.8.2.1, 3/4.8.2.2, 3/4.8.3.1 AND 3/4.8.3.2 ELECTRICAL POWER SYSTEMS D.C. SOURCES AND ONSITE POWER DISTRIBUTION l Referenco: ULNRC-3071 dated September 9, 1994 The referenced letter transmitted an ,

application for amendment to Facility Operating License No. NPF-30 for Callaway Plant. The amendment request, ,

in part, revised Specification 3.8.3.1 by relocating  ;

the requirement to maintain tie breakers between redundant busses open, to Tables 3.3-3 and 4.3-2. The  :

change also included, in Table 3.3-3, Action 19, an 8-hour allowed outage time when a single tie breaker between busses NG01 and NG03 or NG02 and NG04 may be closed.

The requirement for maintaining the tie breakers open is being relocated to a more appropriate .

section and information is being added to indicate its  !

direct impact on the plant. The cl6 sing of the tie breaker would cause the degraded voltage bistables setting to be incorrect. This would cause 4 of 4 channels of one safety load group to become inoperable, thus exceeding the minimum channels needed and placing >

the plant in Specification 3.0.3. However, in this case, implementation of Specification 3.0.3 is not '

appropriate in that one safety train is unaffected.

Also, the load shedder and sequencer is integral with  !

the degraded voltage function. The action statement for loss of one division of the load shedder / load eequencer is to declare the associated diesel generator ,

%~DR ,ADOCK 05000483 eDe 4 \

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-land off-site power source. inoperable and to take action

-per Specification 3.8.1.1 or Specification 3.8.1.2.

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F For.this condition, a 12-hour period is given~to

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F restore operable status or be in HOT STANDBY in the {

i next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and'in COLD SHUTDOWN in the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

-The 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> allowed in the revised Action Statement is clearly. bounded by these conditions.

The option of closing the tie breaker to maintain the affected bus energized will' enhance-the. ,

safe operation'of the plant in the event that the-l normal feed.is lost or degraded. Powering equipment '

from the affected busses when a. tie breaker is closed i is preferable to a forced shutdown under the provisions of Specification 3.0.3. There is a low probability i that voltage on the system would be low enough to  ;

affect the setpoint even with the tie breakers closed. i The redundant train is fully operable and protected during this time period. There is a clear safety benefit to operating under this degraded condition for-  !

a short time rather than requiring a forced shutdown '

under the time constraints of Specification 3.0.3.

Closing of a tie breaker in a mode when.the busses are required to be operable, for the purpose of  ;

performing normal preventative maintenance is not the  !

intent of this change. Attachment 1 to this letter  !

provides revised language to clarify this. ,

The basis and conclusions of the Safety' .

Analysis, Significant Hazard Evaluation and i

Environmental Evaluation are not affected by the information provided herewith.

If there are any questions with regard to this information please contact us. '

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Very truly yours,  ;

Donald F. Schnell I DES /plr

Attachment:

Technical Specification Page 3/4 3-20a.

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STATE OF MISSOURI )

) SS

. CITY OF'ST. LOUIS )

Donald F. Schnell, of lawful age, being first duly sworn upon oath says that he-is Senior Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and-knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his -

knowledge, information and belief.

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By I d -

Donald F. 'Schnell Senior Vice President Nuclear SUBSQRIBED apd sworn to before me this NN day of KTLtl+n/Lu' , 1994.

/A & A Ybd/

BARBARA J. PF E NOTARY PUBLIC-STATE OF MISSOURI y( GQMMISSION EXPlRES APRIL 22.199Z SL t.ouls COUNIX f

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C cc: ' T. A. Baxter, Esq.

Shaw, Pittman, Potts & Trowbridge  !

2300 N.-Street, N.W.

' Washington,1D.C. 20037 >

M. H. Fletcher Professional Nuclear Consulting, Inc.

-18225-A Flower Hill Way-

• Gaithersburg, MD 20879-5334 L. Robert Greger  ;

Chief, Reactor Project Branch 1  :

U.S. Nuclear Regulatcry Commission Region III B31'Warrenville Road Liole, IL 60532-4351 Bruce Bartlett Callaway Resident Office '

U.S. Regulatory Commission RR#1 Steedman, MO 65077 L. R. Wharton (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E21 11555 Rockville Pike l Rockville, MD 20852-2738 Manager, Electric Department Missouri Public Service Commission ,

P.O. Box 360 Jefferson City, MO 65102 Ron Kucera i Department of Natural Resources P.O. Box 176 >

Jefferson City, MO 65102 i

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