ML20141E925
| ML20141E925 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 06/26/1997 |
| From: | Wigginton D NRC (Affiliation Not Assigned) |
| To: | Mcgaha J ENTERGY OPERATIONS, INC. |
| References | |
| TAC-M97835, NUDOCS 9707010217 | |
| Download: ML20141E925 (4) | |
Text
_.
A Mr. John R. McGaha, Jr.
June 26, 1997 Vice President - Operations Entergy Operations, Inc.
River Bend Station P. O. Box 220 St. Francisville, LA 70775
SUBJECT:
RIVER BEND STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION ON MAXIMUM EXTENDED LOAD LINE LIMIT IMPLEMENTATION (TAC NO. M97835)
Dear Mr. McGaha:
By letter dated January 20, 1997, Entergy Operations, Inc. requested a change to the technical specifications (TSs) for the River Bend Station (RBS)
Facility Operating License No. NPF-47. The change would implement the maximum extended load line limit analysis (MELLLA) for RBS operation.
In our review of the proposed change, we have identified additional information enclosed, which we need in order to complete the review.
It is requested that Entergy provide a response within 30 days so that we can complete the review.
If you have any questions on our request, please let me know.
Sincerely, ORIGINAL SIGNED BY:
David L. Wigginton, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket No. 50-458
Enclosure:
Request for Additional Information cc w/ enc 1:
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B NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 30emH001 I
59 June 26,1997 l
l Mr. John R. McGaha, Jr.
Vice President - Operations Entergy Operations, Inc.
River Bend Station P. O. Box 220 St. Francisville, LA 70775 i
SUBJECT:
RIVER BEND STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION ON MAXIMUM EXTENDED LOAD LINE LIMIT IMPLEMENTATION (TAC NO. M97835)
Dear Mr. McGaha:
By letter dated January 20, 1997, Entergy Operations, Inc. requested a change to the technical specifications (TSs) for the River Bend Station (RBS)
Facility Operating License No. NPF-47. The change would implement the maximum extended load line limit analysis {MELLLA) for RBS operation.
In our review of the proposed change, we have identified additional information enclosed, which we need in order to complete the review.
It is requested that Entergy provide a response within 30 days so that we can complete the review.
If you have any questions on our request, please let me know.
Sincerely, s _e David L.
inton, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket No. 50-458
Enclosure:
Request for Additional Information cc w/ enc 1: See next page l
^
Mr. JIhn R. McGaha Entergy Operations, Inc.
River Bend Station ec:
l Winston & Strawn Executive Vice President and
-1400 L Street,~N.W.
Chief Operating Officer
-Washington, DC 20005-3502 Entergy Operations, Inc.
P. O. Box 31993
.i Manager - Licensing Jackson, MS 39286 Entergy Operations, Inc.
River Bend Station General Manager - Plant Operations e
P. O. Box 220 Entergy Operations, Inc.
St. Francisv111e, LA 70775 River Bend Station l
P. O. Box 220 Director St. Francisville, LA 70775 Joint Operations Cajun 10719 Airline Highway Director - Nuclear Safety P. O. Box 15540 Entergy Operations, Inc.
Baton Rouge, LA 70895 River Bend Station P. O. Box 220 i
Senior Resident Inspector St. Francisville, LA 70775 j
P. O. Box 1050 St. Francisville, LA 70775 Vice President - Operations Support Entergy-Operations, Inc.
President of West Feliciana P. O. Box 31995 i
Police Jury Jackson, MS 39286-1995 P. O. Box 1921 i
St. Francisville, LA 70775 Attorney General State of Louisiana i
Regional Administrator, Region IV P. O. Box 94095 U.S. Nuclear Regulatory Commission Baton Rouge, LA 70804-9095 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011 Wisc, Carter, Child & Caraway 4
P. O. Box 651 Ms. H. Anne Plettinger Jackson, MS 39205 3456 Villa Rose Drive i
Baton Rouge, LA 70806 Vice President & Controller l
Cajun Electric Power Cooperttive j
Administrator 10719 Airline Highway Louisiana Radiation Protection Division P.O. Box 15540 P. O. Box 82135 Baton Rouge, LA 70895 Baton Rouge, LA 70884-2135
1 1
RE0 VEST FOR ADDITIONAL INFORMATION TECHNICAL SPECIFICATIONS CHANGES FOR MAXIMUM EXTENDED LOAD LINE LIMIT (MELLL) IMPLEMENTATION ENTERGY OPERATIONS. INC.
RIVER BEND STATION (RBS) j OPERATING LICENSE NUMBER NPF-47 QQ(NET NO. 50-458 Explain the basis for the values for the revised average power range monitor (APRM) flow-biased scram and rod-block setpoints. What is the analysis methodology used for determining the new nominal setpoint vs. the allowable value, and has the methodology changed from that used to determine the i
l original setpoints? What was the original design basis for including the flow-biased setpoints and how har the design basis changed such that the setpoints are no longer necessary?,
Explain the statement on pg. 3-1 of General Electric (GE) report, "The power / flow state points chosen for analyses of A00s [ anticipated operational occurrences] bound the current licensed operating domain for RBS up to the Increased Core Flow (ICF) region and the MELLL region"?
It appears that the 100% power / 75% flow state point was used as a bounding point for the A00s analyzed in report.
For the A00s reviewed in the report, explain why this point is bounding for flow and power.
L Was the turbine trip without bypass event analyzed for MELLL operation? What are the results and is the transient bounded by another transient?
Explain the conservative adder discussed on page 7-3 of GE report for the loss of feedwater heater event, and explain how the adder bounds the event down to 75% core flow?
Explain why the recirculation pump runout is the limiting event for Reactor l
Internal Pressure Differences as discussed on page 6-1 of the GE report.
ENCLOSURE.
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