ML15356A779
| ML15356A779 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 12/18/2015 |
| From: | Mark D. Sartain Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 15-245B | |
| Download: ML15356A779 (3) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 December 18, 2015 10 CFR 50.90 U.S. Nuclear Regulatory Commission Serial No. 15-245B Attention: Document Control Desk NLOS/DEA R0 Washington, DC 20555 Docket No.: 50-338 License No.: NPF-4 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNIT 1 CLARIFICATION PERTAINING TO SUBMITTALS15-245 AND 15-245A AS DISCUSSED IN NOVEMBER 30. 2015 TELECONFERENCE This letter formally documents an email communication sent to Mr. V. Sreenivas (NRC) from Ms. Diane Aitken (Dominion) on November 30, 2015. The purpose of the email was to provide clarification on two items pertaining to Dominion's submittals dated May 19, 2015 (Serial No.15-245) and September 9, 2015 (Serial No. 15-245A) that were discussed during a November 14, 2015 conversation. The technical content of the email to Mr. Sreenivas is provided below:
Item #1 related to (Serial No.15-245)
Alternative Clarification Dominion is requesting an alternative to the system leakage test requirements of IWB-5222(b). Specifically, Request NI-14-SPT-006 described in Dominion letter dated May 19, 2015 (Serial No.15-245) is asking for exemption from the requirements of IWB-5222(b) for the subject piping between 1-CH-HCV-1311 and 1-CH-328 because there is no installed design ability to verify the pressure in the line or purposely open the HCV to pressurize the line without creating the possibility of an unnecessary plant transient and a thermal shock transient in the spray piping and spray nozzle. The normal Class 1 pressure test walkdowns for leakage performed each refueling outage is sufficient to identify leakage from the line.
Serial No: 15-245B Docket No.: 50-338 November 30, 2015 Teleconference Page 2 of 3 Item #2 RAI 7 from (Serial No. 1 5-245A)
Will there be any retained pressure in the pipe during the VT-2 Examinations? If so, provide the retained pressure values in the pipe and what will be in the pipe (i.e., RCS coolant or air?)
Dominion Clarified Response The subject piping segment between 1-CH-HCV-1311 and 1-CH-328 is assumed to be pressurized to RCS pressure due to minor valve leakage through the Auxiliary Spray check valve (1-CH-328). 1-CH-328 is a 3" swing check valve located downstream of 1-CH-HCV-1 311. This type of valve is subject to minor seat leakage due to imperfections in the seating surface, worn hinge pin bushings, and disc distortions during operation. A review of the inspection and work order history for 1-CH-328 revealed evidence of seat leakage. Although minor, this seat leakage would eventually allow the upstream piping to reach RCS pressure of 2235 psig. However, since no connection is available for mounting temporary instrumentation, pressure in the upstream piping segment has not been validated.
Should you have any questions in regard to this submittal, please contact Ms. Diane E. Aitken at (804) 273-2694.
Mark D. Sartain Vice President - Nuclear Engineering COMMONWEALTH OF VIRGINIA)
COUNTY OF HEN RICO)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Mark D. Sartain, who is Vice President - Nuclear Engineering of Virginia Electric and Power Company. 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 iSr" day of "tCzr.o+/-..wc. 2015.
My Commission Expires: i*+/-L2*L, .. 1
____ ____ ___ ___ ___ ___Notary Public
... WANDA D.CRAFT ..
~~Notary Public
- Commonwealth of Virginia
~Reg.
My # 7520495r Commission Expi res January 31v20+/-*-*
Serial No: 15-245B Docket No.: 50-338 November 30, 2015 Teleconference Page 3 of 3 Commitments made in this letter: No new regulatory commitments.
cc: U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1 257 State Health Commissioner Virginia Department of Health James Madison Building - 7 th floor 109 Governor Street Suite 730 Richmond, VA 23219 Dr. V. Sreenivas NRC Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Karen Cotton-Gross NRC Project Manager U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector North Anna Power Station
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 December 18, 2015 10 CFR 50.90 U.S. Nuclear Regulatory Commission Serial No. 15-245B Attention: Document Control Desk NLOS/DEA R0 Washington, DC 20555 Docket No.: 50-338 License No.: NPF-4 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNIT 1 CLARIFICATION PERTAINING TO SUBMITTALS15-245 AND 15-245A AS DISCUSSED IN NOVEMBER 30. 2015 TELECONFERENCE This letter formally documents an email communication sent to Mr. V. Sreenivas (NRC) from Ms. Diane Aitken (Dominion) on November 30, 2015. The purpose of the email was to provide clarification on two items pertaining to Dominion's submittals dated May 19, 2015 (Serial No.15-245) and September 9, 2015 (Serial No. 15-245A) that were discussed during a November 14, 2015 conversation. The technical content of the email to Mr. Sreenivas is provided below:
Item #1 related to (Serial No.15-245)
Alternative Clarification Dominion is requesting an alternative to the system leakage test requirements of IWB-5222(b). Specifically, Request NI-14-SPT-006 described in Dominion letter dated May 19, 2015 (Serial No.15-245) is asking for exemption from the requirements of IWB-5222(b) for the subject piping between 1-CH-HCV-1311 and 1-CH-328 because there is no installed design ability to verify the pressure in the line or purposely open the HCV to pressurize the line without creating the possibility of an unnecessary plant transient and a thermal shock transient in the spray piping and spray nozzle. The normal Class 1 pressure test walkdowns for leakage performed each refueling outage is sufficient to identify leakage from the line.
Serial No: 15-245B Docket No.: 50-338 November 30, 2015 Teleconference Page 2 of 3 Item #2 RAI 7 from (Serial No. 1 5-245A)
Will there be any retained pressure in the pipe during the VT-2 Examinations? If so, provide the retained pressure values in the pipe and what will be in the pipe (i.e., RCS coolant or air?)
Dominion Clarified Response The subject piping segment between 1-CH-HCV-1311 and 1-CH-328 is assumed to be pressurized to RCS pressure due to minor valve leakage through the Auxiliary Spray check valve (1-CH-328). 1-CH-328 is a 3" swing check valve located downstream of 1-CH-HCV-1 311. This type of valve is subject to minor seat leakage due to imperfections in the seating surface, worn hinge pin bushings, and disc distortions during operation. A review of the inspection and work order history for 1-CH-328 revealed evidence of seat leakage. Although minor, this seat leakage would eventually allow the upstream piping to reach RCS pressure of 2235 psig. However, since no connection is available for mounting temporary instrumentation, pressure in the upstream piping segment has not been validated.
Should you have any questions in regard to this submittal, please contact Ms. Diane E. Aitken at (804) 273-2694.
Mark D. Sartain Vice President - Nuclear Engineering COMMONWEALTH OF VIRGINIA)
COUNTY OF HEN RICO)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Mark D. Sartain, who is Vice President - Nuclear Engineering of Virginia Electric and Power Company. 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 iSr" day of "tCzr.o+/-..wc. 2015.
My Commission Expires: i*+/-L2*L, .. 1
____ ____ ___ ___ ___ ___Notary Public
... WANDA D.CRAFT ..
~~Notary Public
- Commonwealth of Virginia
~Reg.
My # 7520495r Commission Expi res January 31v20+/-*-*
Serial No: 15-245B Docket No.: 50-338 November 30, 2015 Teleconference Page 3 of 3 Commitments made in this letter: No new regulatory commitments.
cc: U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1 257 State Health Commissioner Virginia Department of Health James Madison Building - 7 th floor 109 Governor Street Suite 730 Richmond, VA 23219 Dr. V. Sreenivas NRC Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Karen Cotton-Gross NRC Project Manager U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector North Anna Power Station