ML20021A005
| ML20021A005 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/17/2020 |
| From: | Mark D. Sartain Dominion Energy Virginia, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 20-014 | |
| Download: ML20021A005 (9) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 January 17, 2020 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 1 INSERVICE TESTING PROGRAM 10CFR50.90 Serial No.:
20-014 NAPS/DPM RO Docket No.:
50-338 License No.:
NPF-4 REQUEST FOR ALTERNATIVE TO REQUIREMENTS OF ASME OM CODE RELIEF REQUEST P-9 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION By letter dated November 18, 2019 (Serial No.19-445) (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19329A285), Virginia Electric and Power Company (Dominion Energy Virginia) submitted an alternative, pursuant to Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(z)(2), to the requirements of the American Society of Mechanical Engineers (ASME) Operation and Maintenance of Nuclear Power Plants, Division 1, OM Code: Section 1ST (OM Code) associated with inservice testing (1ST) frequency of charging pump 1-CH-P-1A at the North Anna Power Station (NAPS) Unit 1. Relief Request P-9 provided the basis for the alternative request in the November 18, 2019 letter.
The NRC staff has reviewed Relief Request P-9 and determined that additional information is needed to complete their review. In an email from Ed Miller (NRC) to Diane Aitken (Dominion Energy) dated December 20, 2019, the NRC provided specific requests for additional information (RAls) to support their review of the submittal.
Attachments 1 through 3 provide the response to the NRC RAls.
Serial No.: 20-014 Docket No.: 50-338 RR P Response to RAI Page 2 of 3 Should you have any questions or require additional information, please contact Ms. Diane E. Aitken at (804) 273-2694.
Respectfully,
-
Mark D. Sartain Vice President Nuclear Engineering and Fleet Support COMMONWEAL TH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Mr.
Mark D. Sartain, who is Vice President - Nuclear Engineering and Fleet Support, 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.
1111 Acknowledged before me this n.:_:_ day of Jt:2Mt.,ttAr"'j
, 2020.
My Commission Expires: lZ( 3 I I Zo Commitments contained in this letter: None Attachments:
1.
Relief Request P Response to RAI Notary Public
- 2. 1-CH-P-1A Comprehensive Pump Test Vibration Plot
- 3. 1-CH-P-1A Group A Pump Test Vibration Plot
cc:
U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1257 State Health Commissioner Virginia Department of Health James Madison Building - 7th floor 109 Governor Street Suite 730 Richmond, VA 23219 Mr. G. Edward Miller NRC Senior Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 09 E-3 11555 Rockville Pike Rockville, MD 20852-2738 Mr. Vaughn Thomas NRC Project Manager - Surry U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 04 F-12 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector North Anna Power Station NRC Senior Resident Inspector Surry Power Station Mr. Marcus Harris Old Dominion Electric Cooperative Innsbrook Corporate Center Suite 300 4201 Dominion Blvd.
Glen Allen, VA 23060 Serial No.: 20-014 Docket No.: 50-338 RR P Response to RAI Page 3 of 3
ATTACHMENT 1 RELIEF REQUEST P-9 RESPONSE TO RAI VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)
NORTH ANNA POWER STATION UNIT 1 Serial No.20-014 Docket No.: 50-338
Serial No.20-014 RR P-9: Response to RAI Page 1 of 1 Request for Alternative to Requirements of ASME OM Code Relief Request P-9 Response to Request for Additional Information By letter dated November 18, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19329A285), Virginia Electric and Power Company (Dominion Energy Virginia), requested U.S. Nuclear Regulatory Commission (NRC) approval of an alternative, pursuant to Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(z)(2), to the requirements of the American Society of Mechanical Engineers (ASME) Operation and Maintenance of Nuclear Power Plants, Division 1, OM Code:
Section 1ST (OM Code) associated with inservice testing (1ST) frequency of charging pump 1-CH-P-1A at the North Anna Power Station (NAPS) Unit 1.
During their review of this alternative request, the NRC determined that additional information was needed. The NRC request and Dominion Energy response is provided below.
NRC RAI In the submittal, Dominion Energy Virginia states that the Group A test provides a method to monitor pump vibration parameters comparable to that of the Comprehensive Pump Test (CPT), which is demonstrated using two vibration signature plots for the CPT and Group A test. The plots submitted in the licensee's letter are not sufficiently legible for the NRC staff to confirm the licensee's statements supporting the request.
To allow the NRC staff to independently verify the statements in the submittal, please resubmit the plots on the docket in a more legible manner such that the values and units of the axes are legible. Additionally, please ensure that the plots identify the frequencies at which vibration spikes occur.
DOMINION ENERGY RESPONSE In the November 18, 2019 letter referenced above, the two vibration plots at the bottom of page 5 of 8 comparing vibration signatures between the CPT and the Group A pump test for 1-CH-P-1A were not sufficiently legible.
The CPT and Group A vibration plots for 1-CH-P-1 A are included as Attachments 2 and 3, respectively, in a non-compressed state so that they are sufficiently legible. As indicated on these plots, the vibration spikes occur at similar frequencies for the CPT and the Group A pump test for 1-CH-P-1A.
ATTACHMENT 2 1-CH-P-1A COMPREHENSIVE PUMP TEST VIBRATION PLOT VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)
NORTH ANNA POWER STATION UNIT 1 Serial No.20-014 Docket No.: 50-338
Spectrum of Thrust Vertical Point on 1-CH-P-lA, Group A Pump Test 0.3_---r"-`---------------------------------------------,
co (I) 0.25 0.2
°;-0.15 0.1 0.05 10000 20000 30000 POINT 40000 50000 60000 Frequency - CPM Information Value 70000 1-PT-14.1 \\ [I] Thrust Vert Measurement 7/10/2019 1:46:19 PM Speed 4860 POINT description Thrust Vertical Machine description Quarterly PT [1ST]
SET name 1-CH-P-1A \\ 1-PT-14.1 \\ [I] Thrust Vert Units in/s Full scale 0.4 Low frequency cutoff 300 Frequency range O - 300000 CPM Detection Peak Window Hanning Lines 800 Averages 4
Save Data FFT and time Threshold 0.04 Spectrum Overall 0.2961 Sync 0.2729 Subsync 0.02389 Nonsync 0.1123 POINT Summary POINT Information Value 1-PT-14.1 \\ [I] Thrust Vert POINT description Thrust Vertical Units in/s Measurement 7/10/2019 1:46:19 PM POINT Frequency Order Amplitude Phase
--- 1-PT-14.1 \\[l]ThrustVert 8625 1.77 0.08953 (in/s - Peak) 1-PT-14.1 \\ [I] Thrust Vert 7125 1.47 0.03845 (in/s - Peak)
- PT-14.1 \\ [I] Thrust Vert 4875 1
0.2606 (in/s - Peak) 80000 90000 100000 Value Value
ATTACHMENT 3 1-CH-P-1A GROUP A PUMP TEST VIBRATION PLOT VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)
NORTH ANNA POWER STATION UNIT 1 Serial No.20-014 Docket No.: 50-338
0.35 0.3 0.2 5
..11:: 0.2 Cll
.5:0.1 5 0.1 0.0 5 0
0 f\\f Spectrum of Thrust Vertical Point on 1-CH-P-lA, Comprehensive Pump Test
)
l
h_
A 10000 20000 30000 POINT I\\
40000 50000 60000 Frequency - CPM Information Value 70000 80000 1-PT-138.3A/B/C \\ 1-CH-P-1A I Measurement 9/22/2019 10:53:48 AM Speed 4860 POINT description Thrust vert.
Machine description SET name 1-CH-P-1A \\ 1-PT-138.3A/B/C \\ 1-CH-P-1A I Units in/s Full scale 0.4 Low frequency cutoff 300 Frequency range 0 - 300000 CPM Detection Peak Window Hanning Lines 800 Averages 4
Save Data FFT and time Threshold 0.04 Spectrum Overall 0.3457 Sync 0.316 Subsync 0.03453 Nonsync 0.1357 POINT Summary POINT Information Value 1-PT-138.3A/B/C \\ 1-CH-P-1A I POINT description Thrust vert.
Units in/s Measurement 9/22/2019 10:53:48 AM POINT Frequency Order Amplitude Phase 1-PT-138.3 A/B/C \\ 1-CH-P-1A I 862 5 1.77 0.1219 (in/s - Peak) 1-PT-138.3 A/B/C \\ 1-CH-P-1A I 712 5 1.47 0.03946 (in/s - Peak) 1-PT-138.3A/B/C \\ 1-CH-P-1A I 487 5 1
0.2974 (in/s - Peak) 90000 Value Value 100000