ML051920247
| ML051920247 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/07/2005 |
| From: | Grecheck E Dominion Nuclear Connecticut |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 04-707A | |
| Download: ML051920247 (6) | |
Text
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\\V.iiciIord, (I O(1185 July 7, 2005 U. S. Nuclear Regulatory Commission Serial No.
04-707A Attention: Document Control Desk NLOS/PRW RO One White Flint North Docket Nos. 50-336 Rockville, MD 20852-2738 1 1555 Rockville Pike 50-423 License Nos. DPR-65 N PF-49 DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNITS 2 AND 3 SUPPLEMENT TO PROPOSED TECHNICAL SPECIFICATIONS CHANGES SHUTDOWN OPERATIONS INVOLVING POSITIVE REACTIVITY ADDITIONS In a letter dated March 9, 2005, Dominion Nuclear Connecticut, Inc. (DNC) submitted a request to amend Operating Licenses DPR-65 for Millstone Power Station Unit 2 (MPS2) and NPF-49 for Millstone Power Station Unit 3 (MPS3).
The changes incorporate wording for shutdown operations involving positive reactivity additions consistent with Improved Standard Technical Specifications Change Traveler, TSTF-286-A, Revision 2.
In a phone conversation May 24, 2005, DNC and the U. S. Nuclear Regulatory Commission (NRC) discussed clarifications to the request. The attachment to this letter contains supplemental wording to the request based on that phone conversation. This information describes procedures in use at Millstone and the normal practices associated with updating them as part of implementation of license amendments.
The additional information provided in this letter does not affect the conclusions of the safety summary and significant hazards considerations discussion in DNCs March 9, 2005, submittal.
Should you have any questions regarding the supplemental wording, please contact Mr. Paul R. Willoughby at (804) 273-3572.
Very truly yours, n
Eugene S. Grecheck Vice President - Nuclear Support Services Attachment There are no new commitments contained in this letter.
Serial No. 04-707A Docket Nos. 50-336/50-423 Supplement to Proposed Technical Specifications Changes Page 2 of 3 cc:
U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1 41 5 Mr. V. Nerses Senior Project Manager, Millstone Unit 2 U.S. Nuclear Regulatory Commission One White Flint North 1 1555 Rockville Pike Mail Stop 8C2 Rockville, MD 20852-2738 Mr. G. F. Wunder Senior Project Manager, Millstone Unit 3 U.S. Nuclear Regulatory Commission One White Flint North 1 1555 Rockville Pike Mail Stop 08-8-1 A Rockville, MD 20852-2738 Mr. S. M. Schneider NRC Senior Resident Inspector Millstone Power Station
Serial No. 04-707A Docket Nos. 50-336/50-423 Supplement to Proposed Technical Specifications Changes Page 3 of 3 COMMONWEALTH OF VIRGINIA
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COUNTY OF HENRICO 1
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Eugene S. Grecheck, who is Vice President - Nuclear Support Services of Dominion Nuclear Connecticut, Inc. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 7 ut7 day of VL&~
,2005.
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Notary Public (SEAL)
Serial No. 04-707A Docket Nos. 50-336/50-423 ATTACHMENT SUPPLEMENT TO PROPOSED TECHNICAL SPECIFICATIONS CHANGES SHUTDOWN OPERATIONS INVOLVING POSITIVE REACTIVITY ADDITIONS SUPPLEMENT TO SAFETY
SUMMARY
DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNITS 2 AND 3
Serial No. 04-707A Docket Nos. 50-336/50-423 Supplement to Proposed Technical Specification Changes Attachment Page 1 of 2 SUPPLEMENT TO SAFETY
SUMMARY
Per Section 4.0, Safety Summary of Attachments 1 and 4 of the Dominion Nuclear Connecticut letter dated March 9, 2005, the following wording is generally applied to describe introduction of coolant inventory to the reactor coolant system (RCS):
Introduction of coolant inventory must be from sources that have a boron concentration greater than what would be required in the RCS for minimum shut down margin (SDM) or refueling boron concentration, but provides acceptable margin to maintaining subcritical operation. Coolant additions are controlled by plant operating procedures to ensure SDM and minimum required boron concentration are mai n tai ned.
To address how coolant additions are to be controlled, the following supplemental information is provided:
Sources of borated RCS inventory makeup include the refueling water storage tank (RWST) and boric acid tanks. Borated makeup water to the RCS may be injected from each of the above sources individually, or may be injected as a blended boric acid solution from the boric acid tanks and a demineralized water source.
The plant operating procedures currently calculate the required SDM boron concentration for the operating conditions (e.g., plant operating mode, RCS temperature, core burnup, etc.) and other conditions as required. These SDM calculations will not be changed by the proposed technical specification change.
As part of the implementation of the proposed changes to the TS, the plant operating procedures will be changed to add conditional statements to require that the boron concentration of the makeup water is greater than or equal to the required minimum SDM boron concentration (or the refueling boron concentration for the refueling operations limiting conditions for operation).
An example of the wording that may be proposed for the procedure changes for Millstone Unit 2:
- 1. IF RCS inventory makeup is required AND the Technical Specifications do NOT allow introduction of makeup water with boron concentration less than the required minimum SDM boron concentration, PERFORM one of the fo I lowi ng :
Refer To OP 2304C, Make Up (Boration and Dilution) Portion of CVCS, and BORATE from RWST or boric acid storage tanks, QFJ
Serial No. 04-707A Docket Nos. 50-336/50-423 Supplement to Proposed Technical Specifications Changes Page 2 of 2 Refer To OP 2208, Reactivity Calculations (for maintaining SDM),
and OP 2304C, Make Up (Boration and Dilution) Portion of CVCS, and PERFORM applicable action to inject makeup water at a boron concentration greater than the required shutdown boron concentration for current plant conditions Similarly, Millstone Unit 3 procedures will be modified to add conditional statements to require makeup water boron concentration greater than that required for the minimum SDM or refueling boron concentration.