ML20196H006
| ML20196H006 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/30/1998 |
| From: | Conway J NIAGARA MOHAWK POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20196H010 | List: |
| References | |
| NMP1L-1386, NUDOCS 9812080183 | |
| Download: ML20196H006 (2) | |
Text
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Jolm T. Conway Pt one: 315.349.4213
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Vice Presiderg Fax: 315.349.2605 Nuclear Generation November 30,1998 NMPIL 1386 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE:
Nine Mile Point Unit 1 Docket No. 50-220 DPR-63 Gentlemen:
i Niagara Mohawk Power Corporation (NMPC) hereby transmits an Application for Amendment to Nine Mile Point Unit 1 (NMP1) Operating License DPR-63. Also enclosed as Attachment A are the proposed changes to the Technical Specifications (TS) and the associated Bases set forth in Appendix A to the above mentioned license. Supporting information and analyses demonstrating that the proposed changes involve no significant
- hazards consideration pursuant to 10CFR50.92 are included as Attachment B. Also included in Attachment B is a statement of eligibility for categorical exclusion from performing an environmental assessment. Hand marked copies of the affected current NMP1 TS pages are provided as Attachment C of our application to assist your review.
The proposed amendment provides changes to correct the Limiting Condition for Operation and the associated Bases for TS Section 3.1.2, " Liquid Poison System," that had been incorporated into the TS as part of NMP1 TS Amendment No.101. The first revision occurs in Bases 3.1.2 and concerns the current concentration of 120 ppm boron-10. The
~ 120 ppm boron-10 was incorrectly calculated using atomic percent instead of weight percent. The correct concentration of boron-10 is 109.8 ppm.
The second revision occurs in TS Section 3.L2c. The currently specified minimum volume of 1185 gallons was also incorrectly calculated based on atomic percent boron-10 and a j
pump injection rate of 27 gpm, rather than weight percent boron-10 and a pump injection 1
rate of 30 gpm Based on the correct weight percent of boron-10 and the pump injection
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rate of 30 gpm, the correct minimum volume of boron bearing solution is 1300 gallons.
j The 1300 gallons includes a 25% margin (to account for non-uniform mixing) and 197 gallons unusable volume. Including a 25 gallon margin for conservatism, the new proposed TS minimum volume is 1325 gallons.
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P PDR ig Nine Mile Point Nuclear Station R0. Box 63 Lycoming. New York 13093-0063
- www.nimo com
Page 2 Upon discovery of the inadequate TS controls, NMPC evaluated the operability of the Liquid Poison System based on the historical normalliquid poison tank volume and the solution enrichment and concentration. NMPC has concluded that at no time has the Liquid Poison System been inoperable due to the inadequate TS controls. In addition, administrative controls were immediately established for required enrichment, concentration, and minimum tank volume to assure the continued operability of the Liquid Poison System untilissuance of this proposed amendment. The proposed changes are needed to maintain compliance with the requirements of 10CFR50.62, " Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATWS) Events for Light-Water-Cooled Nuclear Power Plants." In addition, these changes will maintain the capability of the Liquid Poison System to bring the reactor from a full design rating of 1850 megawatts thermal to greater than 3 percent delta k suberitical (0.97 k,n) assuming none of the control rods can be inserted, and considering the combined effects of coolant voids, temperature change, fuel doppler effect, and presence of xenon and samarium. These changes are plant specific and unrelated to the improved Standard Technical Specifications, NUREG-1433.
Pursuant to 10CFR50.91(b)(1), NMPC has provided a copy of this license amendment request and the associated analyses regarding no significant hazards consideration to the appropriate state representative.
Very truly yours, e
(*
John T. Conway Vic resident Nuclear Generation JTC/KLL/ kap Attachments xc:
Mr. H. J. Miller, Regional Administrator, Region 1 Mr. S. S. Bajwa, Director, Project Directorate,1-1, NRR Mr. G. K. Hunegs, Senior Resident inspector Mr. D. S. Hood, Senior Project Manager, NRR Mr. J. P. Spath NYSERDA 286 Washington Avenue Ext.
Albany, NY 12203-6399 Records Management