ML101340588
| ML101340588 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 05/12/2010 |
| From: | Bajestani M Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML101340588 (4) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Spring City, TN 37381-2000 May 12, 2010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391
Subject:
Watts Bar Nuclear Plant (WBN) Unit 2 - Independent Design Verification Program The purpose of this letter is to provide the U.S. Nuclear Regulatory Commission (NRC) a description of the WBN Unit 2 Independent Design Verification Program, as requested during a conversation between the NRC Staff and the Tennessee Valley Authority (TVA). The enclosure to this letter provides the requested information.
There are no regulatory commitments associated with this submittal. If you have any questions, please contact William Crouch at (423) 365-2004.
Sincerely, Masou,'ajestani Watts r Unit2 Vice President
Enclosure:
- 1. Watts Bar Nuclear Plant Unit 2 Independent Design Verification Program cc: See page 2 Zi0D3 C Printed on recycled paper
U.S. Nuclear Regulatory Commission Page 2 May 12, 2010 cc (Enclosure):
U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, GA 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381
Enclosure Watts Bar Nuclear Plant Unit 2 Independent Design Verification Program
Watts Bar Nuclear Plant Unit 2 Independent Design Verification Program The Watts Bar Nuclear Plant (WBN) Unit 2 Independent Design Verification Program (IDVP) will be implemented to demonstrate WBN's ability to provide engineering, procurement, construction, and quality assurance support to ensure that:
- 1. Regulatory requirements and design bases as specified in the license application are correctly implemented in specifications, drawings, calculations, and procedures.
- 2. The correct design information has been provided to the responsible design organizations.
- 3. Design engineers have sufficient technical guidance and experience to perform assigned engineering functions.
- 4. Design controls, as applied to the original design, have also been applied to design changes, including field changes.
WBN Bar Unit 2 has selected the Residual Heat Removal (RHR) System (System 074) and the Component Cooling System (CCS) (System 070) as the systems which will be evaluated under the IDVP process.
The RHR system is a complex safety-related, single unit emergency core cooling system which receives support from other safety-related systems/features such as auxiliary power, emergency diesel power, control air, containment isolation, essential raw cooling water, etc. The Unit 2 design for this system will include the procurement of a major piece of ASME Section III replacement hardware (RHR heat exchanger upper shell and tube bundle). These items are being replaced since the original Unit 2 hardware was installed in Unit 1 in 1997. The CCS is a safety-related system which is shared by Units 1 and 2. Review of these systems will evaluate the overall processes described above as well as the manner in which shared system requirements are addressed and demonstrate effective interface with the operating unit engineering documents and staff.
The vertical slice review of these systems will evaluate TVA's overall engineering, procurement, construction, and quality assurance processes, as well as demonstrate the ability to translate system requirements between systems and units. The review will address the mechanical, instrumentation and controls, electrical, and civil features and thus provides a comprehensive overview.
The WBN Unit 1 review was performed by a Sargent & Lundy team. The Unit 2 review will be led by an independent TVA senior manager (not associated with the WBN Unit 2 project) with outside consultants. The review is scheduled to begin the last week of September 2010 and expected to continue for approximately two weeks.
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