ML20235G834
| ML20235G834 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 09/22/1987 |
| From: | James O'Reilly GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20235G836 | List: |
| References | |
| SL-3195, TAC-66471, NUDOCS 8709300250 | |
| Download: ML20235G834 (9) | |
Text
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5 A*J
. Georgia Fbwer Company
' 333 Piedmont Awinue -
. Atlanta, Georgia 30308 Telephone 404 5?6 7851
' Mailing Address:.
Ftst Olhee Box 4545 Atlanta. Georgia 30302 o V ce r dent Nuclear OperaDons
-SL-3195 1667C-X7GJ17-H000.
September 22, 1987 U.S; Nuclear Regulatory Commission ATTN: Document Control Desk Hashington, D.C.
20555 PLANT HATCH - UNIT 2 h uS 2
NRC DOCKET 50-321 to OPERATING LICENSE NPF-5 REQUEST TO REVISE TECHNICAL SPECIFICATIONS y J, STANDBY LIOUID CONTROL SYSTEM OPERATION USING ENRICjiED SODIUM PENTABORATE-w Gentlemen:
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-In accordance with the provisions of 10 CFR 50.90 as required by 10 CFR 50.59(c) (1), Georgia Power Company hereby proposes a change to the Plant Hatch Unit 2 Technical Specifications, Appendix A to Operating License NPF-5.
The proposed change-addresses the use of sodium pentaborate enriched with the boron-10 isotope in the Standby Liquid Control System (SLCS).
Georgia Power Company has proposed the use of enriched sodium pentaborate to meet the requirements of the ATHS Rule, 10 CFR 50.62~ paragraph (c) (4). provides a detailed description of the proposed change and -
circumstances necessitating the change request. details the basis for our determination that the proposed change does not involve significant hazards considerations. provides page change instructions for incorporating the proposed change into the Plant Hatch Unit 2 Technical Specifications.
The proposed revised Plant Hatch Unit 2 Technical Specifications pages follow.
Payment of filing fee is enclosed.
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In order to allow time for procedure revision and orderly incorporation
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into copies of the Technical Specifications, we request that the proposed amendment once approved by the NRC, be issued with an effective date to be no later than 60 days from the date of issuance of the amendment.
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U. S.- Nuclear Regulatory Commission September 22, 1987 Page Two In accordance with the requirements of 10 CFR 50.91, Mr. J. L. Ledbetter of the Environmental Protection Division of the Georgia Department of Natural Resources will be sent a copy of this letter and all applicable attachments.
James P. O'Reilly states that he is Senior Vice President of Georgia Power Company and is authorized to execute this oath on behalf ~ of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.
GEORGIA POWER COMPANY By:
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N Jame P. O'Reilly
-Sworn to and subscribed before me this 22st day
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Nd L ^ v r a:tary Public A vo* eta County. Georgia My Commusen Expires Sept 15,1989 i
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Enclosures:
1.
Basis for change request 2.
10 CFR 50.92 Evaluation 3.
Page Change Instructions 4.
Filing Fee - $150.00 l
c:
(see next page) i l
1667C
l 4
r U. S. Nuclear Regulatory Commission September 22, 1987 Page Three c: Georaia Power Comoany Mr. J. T. Beckham, Jr., Vice President - Plant Hatch GO-NORMS U. S. Nuclear Regulatory Commission. Washinoton. D. C1 Mr. L. P. Crocker, Licensing Project Manager - Hatch U. S. Nuclear Reaulatory Commission. Reaion II Dr. J. N. Grace, Regional Administrator I
Mr. P. Holmes-Ray, Senior Resident Inspector - Hatch State of Georaia Mr. J. L. Ledbetter, Commissioner - Department of Natural Resources
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1667C
y ENCLOSURE 1 PLANT HATCH - UNIT 2 NRC' DOCKET 50-366 OPERATING LICENSE NPF-5 REQUEST TO REVISE TECHNICAL SPECIFICATIONS BASIS FOR CHANGE RE0 VEST l
Proposed Chanag This change modifies the Standby Liquid Control System (SLCS) Technical Specifications to allow enriched sodium pentaborate to be used.
Technically, this involves lowering the limits on solution volume and amount of sodium pentaborate in solution to account for the increased shutdown capacity of enriched sodium pentaborate, and adding an additional surveillance requirement to test the solution periodically for isotopic enrichment.
Administrative 1y, it was desirable to incorporate these changes in such a way as to make the Unit 1 and 2 Technical Specifications as uniform as possible.
The Unit 1 Technical Specifications specify a permissible region of operation on a volume versus concentration graph.
The existing Unit 2 Technical Specifications place limits on the minimum solution volume and sodium pentaborate weight in solution.
It is proposed that the Unit 2 specifications be changed to use the Unit 1 approach.
This involves replacing the existing Figure 3.1.5-1 with two new figures identical to Figures 3.4-1 and 3.4-2 in the Unit 1 Technical Specifications.
The proposed Figure 3.1.5-1 specifies the allowable region of operation on a volume versus concentration graph.
The proposed Figure 3.1.5-2 specifies the allowable region of operation on a temperature versus concentration graph.
The text of Section 3/4.1.5 is revised to reference the proposed figures.
The net effect of these changes is that the Unit 1 and Unit 2 Technical Specifications will have identical figures and apply the same acceptance criteria to the SLCS solution.
A new surveillance requirement (4.1.5.c.5) is added to isotopically test the solution at least every 18 months, prior to startup.
Bases section 3/4.1.5 is revised to reflect operation with enriched sodium pentaborate, and to have the same content as the corresponding Unit 1 bases.
l Basis l
l This change is proposed as a result of new requirements placed on the SLCS by the ATHS Rule,10 CFR 50.62.
The ATHS Rule requires each operating BHR to have an SLCS equivalent in control capacity to a system with an 86 gpm injection rate of 13 weight percent unenriched sodium pentaborate, normalized to a 251 inch diameter reactor vessel. Georgia Power Company has chosen to meet this requirement for Plant Hatch by using sodium pentaborate enriched with the boron-10 isotope.
This solution was one of several proposed by
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General Electric's licensing topical report NEDE-31096-P (Reference 1) and I
found acceptable by the NRC as stated in Reference 2.
1667C El-1 9/22/87 SL-3195 1
ENCLOSURE 1 (Continued)
REQUEST TO REVISE TECHNICAL SPECIFICATIONS BASIS FOR CHANGE REOUEST The increase in reactivity control capability provided by the enriched sodium pentaborate makes it possible to reduce the minimum limits currently in the Technical Specifications.
The minimum allowable concentration of enriched sodium pentaborate is determined by the lowest concentration that will meet the requirements of the ATHS Rule.
Using the calculation methods of NEDE-31096-P, a minimum concentration of 6.2 weight percent sodium pentaborate was found to meet the requirements of the ATHS Rule, based on sodium pentaborate enriched to 60 atomic percent boron-10, an injection flow rate of 41.2 gpm, and a water mass of 434,800 pounds contained within the reactor vessel and associated piping.
These values were chosen so that the results could be applied to both Hatch units.
The effect of decreasing the solution concentration will be to reduce the precipitation temperature for the sodium pentaborate solution.
This reduces the possibility of system failure due to sodium pentaborate precipitation, and increases the reliability of the system.
The minimum allowable volume of solution is a function of concentration and is calculated to meet or exceed the existing' shutdown margin of safety.
The recently approved limits for Unit I raised the margin of safety for Unit 1 to that proposed for Unit 2.
The limits for Unit 2 maintain the margin of safety currently in the Unit 2 Technical Specifications.
The proposed minimum volume of 6.2 weight percent solution is 2883 gallons gross volume; for higher concentrations a lower volume is allowed.
The minimum volume limits include the unusable portion of solution that would be left in the tank and suction lines following SLCS operation.
The new limits are identical to those recently approved by the NRC for j
Unit 1 in Amendment 138 (Reference 3).
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The added surveillance requirement for isotopic testing will ensure that the isotopic content of the solution is at least 60 percent enriched boron-10.
This requirement is identical to the one added to the Unit 1 i
Technical Specifications in Amendment 142 (Reference 4).
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1667C El-2 9/22/87 l
SL-3195 l
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ENCLOSURE 1 (Continued)
-REQUEST TO REVISE TECHNICAL SPECIFICATIONS BASIS FOR CHANGE REOUEST l
Reference 1 1.
" Anticipated Transients Without Scram: Response to NRC ATHS Rule, 10 CFR 50.62", NEDE-31096-P, December 19P5.
2.
" Safety-Evaluation of Topical Report (NEDE-31096-P)
' Anticipated Transients Hithout Scram:
. Response to ATHS. Rule, 10 CFR ' 50,62'",
October 21, 1986.
3.
Amendment No.138 to Facility Operating License DPR-57 for Edwin I. Hatch Nuclear Plant Unit 1; issued May 28, 1987 4.
Amendment No.142 to-Facility Operating License DPR-57 for Edwin I. Hatch Nuclear Plant Unit 1; issued July 7, 1987 4
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1 1667C El-3 9/22/87 SL-3195
ENCLOSURE 2 PLANT HATCH - UNIT 2 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 REQUEST TO REVISE TECHNICAL SPECIFICATIONS 10 CFR 50.92 EVALUATION 1
l' In accordance with 10 CFR 50.92, Georgia Power Company (GPC) evaluated the proposed Technical Specifications amendment and determined that its adoption would not involve a significant hazards consideration.
The bases for this determination are as follows:
ProDosed Change This change modifies the SLCS Technical Specifications to allow enriched sodium pentaborate to be used.
The limits on minimum solution volume and sodium pentaborate content are lowered to account for the increased shutdown capacity of the enriched sodium pentaborate.
Additionally, the form of the limits is changed to specify a permissible region of operation on a volume versus concentration graph.
This change replaces the existing Figure 3.1.5-1 with two new figures, identical to those in the Unit 1 SLCS specifications.
)
The text of Section 3/4.1.5 is revised to reference the limits shown in these new figures.
A new surveillance requirement (4.1.5.c.5) is added to isotopically test the solution at least every 18 months, prior to startup.
Bases section 3/4.1.5 is revised to reflect operation with enriched sodium pentaborate, and to have the same content as the Unit 1 bases.
Baili This change does not involve a significant hazards consideration for the following reasons:
1.
The proposed change does not increase the probability or consequences of an accident previously evaluated because the reliability and function of the SLCS are unaffected by this change.
The only effect on the plant that this change will have is to increase the rate at which boron-10 is injected to the reactor.
This will not increase the probability or consequences of any accident previously evaluated.
2.
The proposed change does not create the possibility of a new or different kind of accident from any accident previously evaluated because no new plant configurations for operation result from this i
change.
The basic operation of the SLCS is unchanged.
The increased rate at which boron-10 atoms is delivered to the core will shut down the reactor faster than before, and is not considered to create f
1667C E2-1 9/22/87 SL-3195 l.
ENCLOSURE 2 (Continued)
REQUEST TO REVISE TECHNICAL SPECIFICATIONS 10 CFR 50.92 EVALUATION the possibility of a new or different kind of accident.
Replacing the weight an'd volume limit with a volume versus concentration curve does not create the possibility of any new accidents 'because this only involves the acceptance criteria for the surveillance tests.
Volume and concentration have always been - the parameters measured, but previously the data. had to be converted to weight of sodium pentaborate.
Eliminating this conversion reduces the possibility of human error.. The possibility of the sodium pentaborate solution containing the incorrect isotopic enrichment of boron-10 is adequately protected against by adding the requirement for periodic isotopic testing of the solution.
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The proposed change does not involve a significant reduction in the margin of safety because the ' minimum volume and concentration limits are calculated to meet the existing shutdown margin for Unit 2.
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1667C E2-2 9/22/87 SL-3195 m
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ENCLOSURE 3 PLANT HATCH - UNIT 2-NRC DOCKET 50-366 OPERATING LICENSE NPF-5 REQUEST TO REVISE TECHNICAL SPECIFICATIONS:
INSTRUCTIONS FOR INCORPORATION The proposed change to Technical-Specifications (Appendix - A to Operating License NPF-5) would be incorporated as follows:
Remove Page Insert Paae 3/4 1-18 3/4 1-18 3/4 1-19 3/4 1-19 3/4.1-20 3/4 1-20 3/4 1-20a B 3/4 1-4 B 3/4 1-4 B 3/4 1-4a B 3/4 1-4a B 3/4 1-4b I
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1667C E3-1 9/22/87 SL-3195
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