ML20012E573
| ML20012E573 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/29/1990 |
| From: | Kintner L Office of Nuclear Reactor Regulation |
| To: | Cottle W SYSTEM ENERGY RESOURCES, INC. |
| References | |
| TAC-73599, NUDOCS 9004050422 | |
| Download: ML20012E573 (4) | |
Text
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March 29, 1990 Docket No. 50 416 Mr. W. T. Cottle Vice President, Nuclear Operations System Energy Resourws, Inc.
P.O. Box 469 Port Gibson, Mirsissippi 39150
Dear Cottle:
SI'BJECT:
STANDBY LIQUID CONTROL SYSTEM TECHNICAL SPECIFICATION -
GRAND GULF NUCLEAR STATION, UNIT 1 (TAC 73599)
By letter dated June 19, 1989, System Energy Resources, Inc., (the licensee)
Unit 1, Technical requested a change to Grand Gulf Nuclear Station,l system.
Specifications (TS) for the standby liquid contro The staff is reviewing your submittal and finds that additional information is required to complete its review.
In order to support our review schedule, you are requested to respond to the enclosed request by May 30, 1990.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P. L. 9 6-511.
Sin cerely,
Original Signed By:
Lester L. Kintner, Senior Project Manager Project Directorate 11-1 Division of Reactor Projects. I/II Office of Nuclear Reactor Regulation
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Document Name:
LTR COTTLE 73599 l
l 9004050422 900329 l
h,'DR ADOCK 05000416 1
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Mr. W. T. Cottle System f.nergy Resources, Inc.
GrandGulfNuclearStation(GGHS) cc:
Mr. T. H. Cloninger Mr. C. R. Hutchinson Vice President, Nuclear Engineering GGNS General Manager
& Support System Energy Resources, Inc.
System Energy Resources, Inc.
P. O. Box 756 P. O. Box 31995 Port Gibson, Mississippi 39150 Jackson, Mississippi 39286 Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.
Wise, Carter, Child, and Attorney General Caraway Department of Justice P. O. Box 651 State of Louisiana Jackson, Mississippi 39205 P. O. Box 94005 Nicholas S. Reynolds, Esquire Bishop. Cook, Purcell Alton B. Cobb, M.D.
and Reynolds State Health Officer 1400 L Street, N.W. - 12th Floor State Board of Health Washington, D.C. '20005-3502 P. O. Box 1700 Mr. Ralph T. Lally Manager of Quality Assurance Entergy Services, Inc.
Office of the Governor P. O. Box 31995 State of Mississippi Jackson, Mississippi 39286 Jackson, Mississippi 39201 Mr. Jack McMillan, Director President, Division of Solid Weste Management Claiborne County Board of Supervisors Mississippi Department of Natural Port Gibscn, Mississippi 39150 Resources P. O. Bcx 10385 1
Jackson, Mississippi 39209 RGional Administrator, Region II i
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U.S. Nuclear Regulatory Comission Nr. John G. Cesare 101 Harietta St., Suite 2900 Director, Nuclear Licensing Atlanta, Georgia 30323 System Energy Resources, Inc.
P. O. Box 469 i
Port Gibson, Mississippi 39150 Mike Moore, Attorney General Frank Spencer, Assist. Attorney General l
Mr. C. B. Hogg, Project Manager State of Mississippi L
Bechtel Power Corporation Post Office Box 22947 P. O. Box 2166 Jackson, Mississippi 39225 Houston, Texas 77252-2166 L
Mr. H. O. Christensen l
Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 399 i
Port Gibson, Mississippi 39150 l.
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I REQUEST FOR ADDITIONAL INFORMATION t
REGARDING TECHNICAL SPECIFICATION (TS) CHANGES T
FOR THE CRAND GULF NUCLEAR STATION UNIT 1 e
i 1.
TS Figure 3.1.5-1, as proposed, provides a better way of defining ellowabic operability conditions for the stan&y liquid control system.
It clearly determines the allowable concentration range of sodium pentaborate which could be effectively maintained by the system and the corresponding volumes of solution which constitute directly seasurable quantities.
However, validity of the graph in Figure 3.1.5-1 is tenperature dependent.
If the temperature of the solution exceeds a certain value, its s)ecific yolume nay becone too hi h to hold enough sodium pentaborate in 9
tic net tank volume specified by the graph.
Acuta 11y this was fwnd to be the case for the 13.6 perant solution at the upper limit of the specified containment air tenperature range (100'F).
In order to prevent this from happening, the limiting temperature of the solution for which the graph in Fig. 3.1.5-1 is valid should be specified on the figure.
Provide a revised figure with the limiting tenperature on it.
2.
Another TS modification proposed by the licensee consists of assuring solubility of sodium pentaborate in the pump suction piping, not by relying on an operable heat tracing circuitry, but by maintaining and monitoring solution temperature within the range of 75' F and 130' F.
The 75' terperature L
provides approxinetely 5' F margin to the saturation temperature for the i
maximm allowable concentration of sodium pentaborate (15.2 percent).
The upper limit of the tenperature range is determined by the operability require-i i
ments of the punp and includes a margin of 20' F.
This change is reflected in the proposed anenonents to TS 4.1.5.a and the Footnote to TS 4.1.5.d 3.
The l
licensee states that with the new concentration ranges there will be no need I
for heat tracing of the pump suction pipe because containment air tenperature l
will be maintained in the range of 70* F to 100* F which would maintain the solution above the saturation temperature hence the surveillance requirement L
for the heat tracing circuits can be removed from TS 4.1.5.a and Footnote to TS 4.1.5. d.3.
Although in most cases, the containment air tenperature will rennin within the range specified for the punp suction piping (75' F to 130' F) it does not constitute a fully contro11abic quantity and cannot be relied upon at all tines.
For example, it may drop below 70'F when the reactor is shutdown and the containment is opened during a refueling operation.
The heat tracing should still be retained as a means for maintaining solution temperature.
The TS should retain, therefore, surveillance requirenents to assure that the heat tracing circuits remain in operable condition.
Provide a revision to your application to retain surveillance requirements in TS 4.1.5.a.3 for the heat tracing circuits and in the Footnote to TS 4.1.5.d.3.
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ACRS (10)
P-315 Grand Gulf File 1
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