ML20236N258

Forwards Request for Addl Info Re RTD Bypass Sys Removal Discussed in Util 870526,0722,0831,1001 & s. Response Requested within 15 Days of Ltr Date

ML20236N258
Person / Time
Site:	Mcguire, Catawba, McGuire, 05000000
Issue date:	11/06/1987
From:	Jabbour K Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-60178, TAC-60179, TAC-65524, TAC-65525, NUDOCS 8711160088
Download: ML20236N258 (6)

Text

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Docket Nos.: 50-413, 50-414 NOV 0 6 Mi and 50-369, 50-370 Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

Subject:

Request for Additional Information Regarding the RTD Bypass System Removal - Catawba Nuclear Station, Units 1 and 2 (TACS65524/65525) and McGuire Nuclear Station, Units 1 and 2 (TACS 60178/60179)

By letters dated May 26 July 22, August 31, and October 1, 1987, you provided information regarding the RTD Bypass System Removal for Catawba Nuclear Station, Units 1 and 2. We have reviewed the material submitted and find that additional information, as outlined in the enclosure and discussed with your staff, is 1 needed prior to completing our review. I For McGuire Nuclear Station, the same additional infonnation (except for items 6 and 8 cf the enclosure) is also needed for completing our review of the similar proposal transmitted by your letters of October 29, 1985, and May 26, i 1987, to eliminate the RTD Bypass System from McGuire Units 1 and 2. l 1

Your response to the enclosure is requested within 15 days from the date of I this letter. Please contact me at (301) 492-7367 or Darl Hood at (301) 492-8961 l if you have questions regarding the enclosure or are unable to meet the requested l completion date.  !

Sincerely, i 8711160088 871106 fDR ADOCK 05000369 Kahtan N. Jabbour, Project Manager PDR Project Directorate II-3 Division of Reactor Projects I/II

Enclosure:

As stated cc: See next page DISTRIBUTION:

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9.....g NOV 0 6 R I Docket Nos.: 50-413, 50-414 l and 50-369, 50-370 ,

Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

Subject:

Request for Additional Information Regarding the RTD Bypass-System Removal - Catawba Nuclear Station, Units 1 and 2 (TACS 65524/65525) and McGuire Nuclear Station, Units 1 and 2 (TACS 60176/60179)

By letters dated May 26, July 22, August 31, and October 1,.1987, you provided )

information regarding the RTD Bypass System L2moval for Catawba Nuclear Station, Units 1 and 2. We have reviewed the material submitted and find that additional information, as outlined in the enclosure and discussed with your staff, is needed prior to completing our review, J For McGuire Nuclear Station, the same additional information (except for items 6 and 8 of the enclosure) is also needed for completing our review of the similar proposal transmitted by your letters of October 29, 1985, and May 26, 1987, to eliminate the RTD Sypass System from McGuire Units 1 and 2. J Your response to the enclosure is requested within 15 days from the date'of this letter. Please contact me at (301) 492-7367 or Darl Hood at (301) 492-8961 i if you have questions regarding the enclosure or are unable to meet the requested l completion date. j Sincerely. .j GDnd.3 % -

Kahtan N. Jabbour, Project Manager Project Directorate 11-3 1 Division of Reactor Projects I/II

Enclosure:

As stated 1

cc: See next page i__

,1 Mr. H. B. Tucker Duke Power Company Catawba Nuclear Station cC:

A.V. Carr, Esq. North Carolina Electric Membership i Duke Power Company Corp. I 422 South Church Street 3400 Sumner Boulevard l Charlotte, North Carolina 28242 P.O. Box 27306 l Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.

Bishop, Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reytolds Inc.

1200 Seventeenth Street, N.W. P.O. Box 929 ,

Washington, D. C. 20036 Laurens, South Carolina 29360  !

North Carolina MPA-1 Senior Resident Inspector 1 Suite 600 Route 2, Box 179N l 3100 Smoketree Ct. York, South Carolina 29745 P.O. Box 29513 )

Raleigh, North Carolina 27626-0513 Regional Administrator, Region II I U.S. Nuclear Regulatory Comission, )

L.L. Williams 101 Marietta Street, NW, Suite 2900 Area Manager, Mid-South Area Atlanta, Georgia 30323 ESSD Projects )

Westinghouse Electric Corp.

1 MNC West Tower - Bay 239 P.O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Heyward G. Shealy, Chief 1 i

Bureau of Radiological Health l South Carolina Department of Health I and Environmental Control l 2600 Bull Street '

Columbia, South Carolina 29201 l County Manager of York County l York County Courthouse Karen E. Long l York South Carolina 29745 Assistant Attorney General N.C. Department.of Justice Richard P. Wilson, Esq. P.O. Box 629 Assistant Attorney General Raleigh, North Carolina 27602 l S.C. Attorney General's Office P.O. Box 11549 Spence Perry, Esquire l Columbia, South Carolina 29211 General Counsel l Federal Emergency Management Agency Piedmorit Municipal Power Agency Room 840 100 Memorial Drive 500 C Street Greer, South Carolina 29651 Washington, D. C. 20472 Mr. Michael Hirsch Federal Emergency Management Agency Office of the General Counsel .

Room 840

• 500 C Street, S.W.

Washington, D. C. 20472 Brian P. Cassidy, Regional Counsel Federal Emergency Management Agency, Region I

$ibi Mcgormach Q aaouo

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1 1 I i Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station- '

i cc: j Mr. A.V. Carr, Esq. Dr. John M. Barry i Duke Power Company Department of Environmental Health . ,

Mecklenburg County P. O. Box 33189 >

422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 i l

County Manager of Mecklenburg County Mr. Dayne' H. . Brown, Chief . l 720 East Fourth Street Radiation Protection Branch' Charlotte, North' Carolina 28202 Division of Facility Services ,

Department of Human Resources j 701 Barbour Drive l Mr. Robert Gill Raleigh, North Carolina. 27603-2008 :l Duke Power Company 1 Nuclear Production Department P. O. Box 33189 Charlotte, North Carolina 28242 J. Michael McGarry, III, Esq. I Bishop, Liberman, Cook, Purcell and Reynolds 1200 Seventeenth Street, N.W.

Washington, D. C. 20036 1 i

Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission  !

Route 4 Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 L. L. Williams Area Manager, Mid-South Area l ESSD Projects j Westinghouse Electric Corpt; ration i MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230  ;

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i REQUEST FOR ADDITIONAL INFORMATION RTD BYPASS SYSTEM REMOVAL CATAWBA NUCLEAR STATION, UNITS 1 AND 2 AND MCGUIRE NUCLEAR STATION, UNITS 1 AND 2

1. Regarding the problem of drif t of the RTD response time identified in NUREG-0809 (Reference 1), describe (a) the method (s) for checking RTD response time, and (b) the safety allowance or other methods to provide assurance that the response times do not drift outside acceptable limits between the 18-month checks. j

2. There is evidence of a slow drif t in RTD readings with time (References 2, l j

3, and 4), possible all in one direction. Discuss how long-term drift would be  ;

detected before it reached unacceptable levels. The staff has accepted one licensee's commitment to replace two RTDs after each of the next two refueling outages to check the calibration of the removed RTDs. j

3. Failure of an RTD in a particular loop would be signalled and alarmed by 1 the deviation of the T and delta T values for that loop compared to l thevaluesfortheothN9three loops. What are the deviation values that will i activate the alam? What is the minimum temperature error in a single failed .j RTD that will cause the deviation alarm to go off? How often will individual  !

RTDs be monitored in normal operations?

4 Indicate your plans to check and confirm the accuracy of the new hot leg temperature measurements by comparison against past measurements by RTDs in bypass loops. The staff has accepted one licensee's comitment to obtain confirmatory infomation by comparing pre-installation and post-installation calorimetric data on RTD temperature measurements in their plant for matching operating conditions. The staff intends to review this confirmatory information.

5. Provide intomation on the changed position of one of the RTDs in loop B regarding its distance downstream from the former location and also its cir-cumferential position compared to before. Provide a sketch of this installation.

Will the wake from the scoop upstream of this new RTD placement affect the accuracy of the reading? Will the RTD in the new location be placed in a scoop as the others are, or be directly exposed to the flow? If directly exposed to the flow, what effect will this have on the temperature value, and also on the response time, compared to the other RTDs which are inside scoops?

6. The RCS flow uncertainty calculated for the new RTD system is 1.7%.

Explain why the 2.1% uncertainty calculated for the bypass RTD system is retained in the revised Catawba Technical Specifications for the new system.

7 The elimination of the RTD bypass system impacts uncertainties associated with the RCS system temperature and flow measurement. This can possibly affect the LOCA analysis. Provide a LOCA analysis or justify the reason for not providing one.

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8. The increase in RTD response time could affect the FSAR Chapter 15 Loss of Load / Turbine Trip non-LOCA transient. Provide an analysis or justify the reason for not providing one.

9. Indicate how the RCS Ta is impacted by the accuracy of the RTD measure-ments. WillanyoftheTSl@tpointsbeinneedofchangebecauseofachangein the accuracy of T,yg with the new system?

REFERENCES

1. NUREG-0809, Safety Evaluation Report, Review of Resistance Temperature Detector Time Response Characteristics, August 1981.

2. NUREG/CR-4928, Degradation of Nuclear Plant Temperature Sensors, June 1987 l

3. K. R. carr, An Evaluation of Industrial Platinum Resistance Thermometer j Temperature - Its Measurement and Control in Science and Industry, ISA Publication Vol. 4, Part 2,1972, Pages 971-982.

4. B. W. Magnum, The Stability of Small Industrial Platinum Resistance Thermometers, Journal of Research of the NBS, Vol. 89, No. 4 July-August 1984, Pages 305-350.  !

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