ML031060297
| ML031060297 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/21/2003 |
| From: | Richard Ennis NRC/NRR/DLPM/LPD1 |
| To: | Douglas Dodson, Price J Dominion Nuclear Connecticut |
| Ennis R, NRR/DLPM, 415-1420 | |
| References | |
| TAC MB8164 | |
| Download: ML031060297 (8) | |
Text
April 21, 2003 Mr. J. A. Price Site Vice President - Millstone Dominion Nuclear Connecticut, Inc.
c/o Mr. David W. Dodson Rope Ferry Road Waterford, CT 06385
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - REQUEST FOR RELAXATION FROM SECTION IV.C(a)(1) OF THE ORDER ESTABLISHING INTERIM INSPECTION REQUIREMENTS FOR REACTOR PRESSURE VESSEL HEADS, MILLSTONE POWER STATION, UNIT NO. 2 (TAC NO. MB8164)
Dear Mr. Price:
By letter dated March 28, 2003, you submitted a request for relaxation of requirements contained in Nuclear Regulatory Commission (NRC) Order EA-03-009, Issuance of Order Establishing Interim Inspection Requirements for Reactor Pressure Vessel [RPV] Heads at Pressurized Water Reactors, dated February 11, 2003, for Millstone Power Station, Unit No. 2 (MP2). Specifically, you requested a one-time relaxation from Section IV.C(1)(a) of the Order, which requires a bare metal visual examination of 100 percent of the RPV head surface (including 360 degrees around each RPV head penetration nozzle).
The NRC staff is reviewing your submittal and has determined that the information contained in the enclosed request for additional information (RAI) will be needed for the staff to complete its review. An advance copy of these RAI questions was faxed to Mr. Ravi Joshi of your staff on April 16, 2003.
As discussed in your letter dated March 28, 2003, you requested that the NRC staff complete its review by May 30, 2003, to support planning for the MP2 fall 2003 refueling outage.
Therefore, we request your response as soon as possible. If you have any questions, please contact me at (301) 415-1420.
Sincerely,
/RA/
Richard B. Ennis, Senior Project Manager, Section 2 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-336
Enclosure:
As stated cc w/encl: See next page
ML031060297 OFFICE PDI-2/PM PDI-2/LA EMCB/SC PDI-2/SC NAME REnnis SLittle forCRaynor GGeorgiev for TChan JClifford DATE 4/17/03 4/17/03 4/18/03 4/18/03
Millstone Power Station Unit 2 cc:
Ms. L. M. Cuoco Senior Counsel Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Edward L. Wilds, Jr., Ph.D.
Director, Division of Radiation Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 First Selectmen Town of Waterford 15 Rope Ferry Road Waterford, CT 06385 Charles Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering 12300 Twinbrook Pkwy, Suite 330 Rockville, MD 20852 Senior Resident Inspector Millstone Power Station c/o U.S. Nuclear Regulatory Commission P.O. Box 513 Niantic, CT 06357 Mr. W. R. Matthews Senior Vice President - Nuclear Operations Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Mr. P. J. Parulis Manager - Nuclear Oversight Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Mr. D. A. Christian Senior Vice President - Nuclear Operations and Chief Nuclear Officer Innsbrook Technical Center - 2SW 5000 Dominion Boulevard Glen Allen, VA 23060 Mr. John Markowicz Co-Chair Nuclear Energy Advisory Council 9 Susan Terrace Waterford, CT 06385 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terrys Plain Road Simsbury, CT 06070 Mr. D. A. Smith Manager - Licensing Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Ms. Nancy Burton 147 Cross Highway Redding Ridge, CT 00870 Mr. G. D. Hicks Director - Nuclear Station Safety and Licensing Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Mr. S. E. Scace Assistant to the Site Vice President Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385
Millstone Power Station Unit 2 cc:
Mr. A. J. Jordan, Jr.
Director - Nuclear Engineering Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385 Mr. S. P. Sarver Director - Nuclear Station Operations and Maintenance Dominion Nuclear Connecticut, Inc.
Rope Ferry Road Waterford, CT 06385
Enclosure REQUEST FOR ADDITIONAL INFORMATION REQUEST FOR RELAXATION FROM SECTION IV.C(a)(1) OF THE ORDER ESTABLISHING INTERIM INSPECTION REQUIREMENTS FOR REACTOR PRESSURE VESSEL HEADS MILLSTONE POWER STATION, UNIT NO. 2 DOCKET NO 50-336 By letter dated March 28, 2003, Dominion Nuclear Connecticut, Inc. (DNC or the licensee) submitted a request for relaxation of requirements contained in Nuclear Regulatory Commission (NRC) Order EA-03-009, Issuance of Order Establishing Interim Inspection Requirements for Reactor Pressure Vessel [RPV] Heads at Pressurized Water Reactors, dated February 11, 2003, for Millstone Power Station, Unit No. 2. Specifically, the licensee requested a one-time relaxation from Section IV.C(1)(a) of the Order, which requires a bare metal visual examination of 100 percent of the RPV head surface (including 360 degrees around each RPV head penetration nozzle).
The NRC staff is reviewing the DNC submittal and has determined that the following information is needed for the staff to complete its review.
1.
Section 5.0(A.1) of the licensees submittal states, in part, that In place of the BMV
[Bare Metal Visual] examination of 100 percent of the RPV head surfaces, DNC proposes the use of ultrasonic (UT) scanning of the low alloy steel vessel head material from the clad surface underside of the vessel head. This inspection technique will scan for acceptable vessel head material thickness in the areas between nozzle penetrations.
... UT scanning will employ multiple transducers in a sled device that is manually manipulated along the underside of the vessel head. The sled will utilize beam patterns that will permit coverage of 100 percent of the external surface of the RPV head low alloy steel that is inaccessible to BMV examination.
- a. Describe the UT scanning that will be performed (i.e., beam angles, etc.).
- b. What contingency plans are there for inspection of base metal adjacent to the downhill side of nozzles that may be shielded by the J-groove weld?
c.
What is the volume percent coverage of the total volume of low alloy steel vessel head material that will be examined between nozzle penetrations using the UT technique from the clad surface underside of the vessel head?
- d. If the volume percent coverage is less than 100 percent, provide justification for the acceptability of the reduced coverage in accordance with Section IV Paragraph F of NRC Order EA-03-009.
2.
Section 5.0(A.1) of the licensees submittal states, in part, that If data reveals measurements that could represent significant degradation, the Millstone Station Corrective Action Program will be used to address the finding and additional nondestructive examinations (NDE) will be performed as appropriate.
- a. What specific criteria will be used to define whether findings are significant degradation?
- b. How does this criteria account for expected variability in the RPV head thickness?
3.
Section 5.0(A.4) of the licensees submittal states, Additional NDE will be performed, should any indications suggest a potential for through wall flaws in the nozzle base material, degradation of the low alloy steel vessel head material, or evidence of leakage paths through the interference fit region. The NDE will include liquid penetrant testing of the nozzle base material and of the J-groove weld as needed to characterize flaws.
- a. If a through-wall flaw in the nozzle base material, degradation of the low alloy steel vessel head material or a leakage path through the interference fit region is found, what specific additional NDE will be performed?
- b. What findings would require a local or global bare metal visual inspection of the RPV head?