ML20210N962
| ML20210N962 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 02/05/1987 |
| From: | Olshan L Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8702130256 | |
| Download: ML20210N962 (4) | |
Text
a Fcbruary 5, 1987 Docket Nos. STN 50-454 DI TRI TION STN 50-455 4:aNRC PDR
'L'ocal PDR PD#3 Rdg.
Mr. D. L. Farrar T. Novak OGC Director of Nuclear Licensing E. Jordan B. Grimes Comonwealth. Edison Company J. Partlow
_N. Thompson J
Post Office Box 767 L. Olshan C. Vogan
. Chicago, Illinois 60690 ACRS (10)
Dear Mr. Farrar:
SUBJELT: SOURCE RANGE INSTRUMENTATION TECHNICAL SPECIFICATION CHANGE BYRON STATION, UNITS 1 AND 2 l
-By letter dated September 15, 1986, you requested a change to the Byron Technical Specifications that would replace the requirement to measure the source range l
flux instrumentation high voltage plateau curve with a requirement to measure source range neutron flux instrumentation discriminator bias curves.
Enclosed is a request for additional information that we need to complete our review.
If any clarification is needed, contact.the Byron Project Manager, L. 01shan, at (301) 492-7354.
Sincerely,
(
Leonard N.
1shan, Project Manager i
Project Directorate #3 Division of PWR Licensing-A i
Enclosure:
As stated cc: See next page
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Commonwealth Edison Company Units 1 and 2 cc:
Mr. William Kortier Ps. Diane Chavez Atonic Power Distribution 528 Gregory Street Westinghouse Electric Corporation Rockford, Illinois 61108 Post Office Box 355 Pittsburgh, Pennsylvania 15?30 Pegional Administrator, Region III U. S.' Nuclear Regulatory Commissicn Michael Miller 799 Roosevelt Road Isham, Lincoln A Beale Glen Ellyn, Illinois 60137
.One First National Plaza 42nd Floor Joseph Gallo, Esq.
Chicago, Illinois 60603 Isham, Lincoln & Beale Suite 1100 Mrs. Phillip B. Johnson 1150 Connecticut Avenue, N.W.
Rockford, Illinois 61107.
Washington, D. C.
20036 1907 Stratford Lane Douglass Cassel, Esq.
Dr. Bruce von Zellen 109 N. Dearborn Street Department of Biological Sciences Suite 1300 Northern Illinois University Chicago, Illinois 60602 DeKalb, Illinois 61107 Ms. Pat Morrison Mr. Edward R. Crass 5568 Thunderidge Drive Nuclear Safeguards & Licensing Rockford, Illinois 61107 Sargent & Lundy Engineers 55 East Monroe Street Ms. Lorraine Creek Chicago, Illinois 60603 Rt.1, Box 182 Manteno, Illinois 60950 Mr. Julian Hinds U. S. Nuclear Regulatory Commission Byron / Resident Inspectors Offices 4448 German Church Road Ryron, Illinois 61010 Pr. Michael C. Parker, Chief Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive Springfield, Illinois 62704
ENCLOSilRE
(,
REQUEST FOR ADDITIONAL INFORMATION 1.
Describe the plant specific procedure for obtaining-high voltage plateau curves.
2.
Describe the plant specific procedure for obtaining discriminator bias curves?
3.
What is the relationship, if any, between discriminator bias curves and BF3 differential bias curves?
4.
Describe how discriminator bias curves give indication of detector de-gradation.
5.
Does either test cause any measurable, or otherwise observable, detector dearadation?
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Licensee has requesied-permission to eliminate a Technical Specificatjon require-
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ment to obtain high volta e plateau curves used to determine-source range detector
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degradation. Licensee prnposes to use ' discriminator lifas curves as an alternate y-method of determining detector degradati,ont' Licensee is requested to answer the
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- s following questions in order to fac111 tate the completion of the staff's review.
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1.
Describe the plant specific prucedure for obtaining high voltage plateau Cu rves,
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2.
Describe the plant specific procedure for obtaining discriminator bias curves?
3.
What is the relationship, if any, between discriminator bias curves and RF3 differential bias curves?
4 Describe how discriminator bias curves give indication of detector de-gradation.
5.
Does either test cause any measurable, or otherwise observable, detector degradation?
i
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