ML101060295
| ML101060295 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 04/19/2010 |
| From: | Milano P Watts Bar Special Projects Branch |
| To: | Bhatnagar A Tennessee Valley Authority |
| Milano, P , NRR/DORL, 415-1457 | |
| References | |
| TAC MD6581 | |
| Download: ML101060295 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 19, 2010 Mr. Ashok S. Bhatnagar Senior Vice President Nuclear Generation Development and Construction Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 SUB~IECT:
WADS BAR NUCLEAR PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING CONSTRUCTION REFURBISHMENT PROGRAM PLAN (TAC NO. MD6581)
Dear Mr. Bhatnagar:
In its letter of December 9, 2008, as supplemented on July 8, 2009, and February 5, 2010, Tennessee Valley Authority (TVA) submitted its Procedure 25402-000-GPP-0000T1216, "Watts Bar Unit 2 Completion Project Refurbishment Program" (T1216). As delineated in Procedure TI216, the program would provide the guidance for the refurbishment of active and passive safety-related, quality-related and nonquality-related equipment. This procedure also identifies requirements that would be used to evaluate preservice degradation of equipment that will not be replaced or refurbished.
The U.S. Nuclear Regulatory Commission (NRC) staff is reviewing the TVA Procedure TI216 in support of the operating license application for Watts Bar Unit 2. The staff has determined that it needs additional information to complete its review. The specific information is detailed in the enclosed request for additional information (RAI). In this regard, the NRC staff requests a response to this RAI within 30 days of receipt of this letter.
If you should have any questions, please contact me at 301-415-1457.
Sincerely, rtJ~(J:).""--............_*__
Patrick D. Milano, Senior Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-391
Enclosure:
RAI cc w/encl: Distribution via Listserv
REQUEST FOR ADDITIONAL INFORMATION WATTS BAR NUCLEAR PLANT, UNIT 2 CONSTRUCTION REFURBISHMENT PROGRAM PLAN TENNESSEE VALLEY AUTHORITY DOCKET NO. 50-391 On December 9,2008, as supplemented on July 8,2009, and February 5,2010, Tennessee Valley Authority (TVA) submitted its Procedure 25402-000-GPP-0000T1216, "Watts Bar [WBN]
Unit 2 Completion Project Refurbishment Program" (T1216). Procedure TI216 provides the guidance for the refurbishment of active and passive safety-related, quality-related and non-quality related equipment. This procedure also identifies requirements that would be used to evaluate pre-service degradation of equipment that will not be replaced or refurbished.
The U.S. Nuclear Regulatory Commission staff is reviewing this program plan and finds that additional information is needed to complete its review. The specific information is described as follows in this request for additional information:
- 1.
For active and passive electrical components that will be refurbished and not replaced, TVA needs to consider the effects of shelf life, pre-aging and other degradation factors.
- a.
Provide a discussion of the basis, methodology, and criteria used to define the categories of electrical components, to determine whether to replace or refurbish, and to establish the actions needed to refurbish specific components. Include examples to assist in understanding the implementation process on a component commodity.
- b.
Describe the methodology for adjusting the qualified or design life of components to account for aging during the layup period (rebaseline). Include examples to assist in describing the program elements and implementation of this methodology.
- c.
Identify those industry standards that govern refurbishment of electrical equipment, and describe how TVA will utilize these standards to refurbish equipment.
- 2.
Describe the actions being taken to assess the conditions of electrical cables that have been in lay-up, including any evaluations and testing to ensure that the cables important to safety meet design basis requirements. The discussion should address, and include examples as necessary to aid in the description:
- a.
The effect of the long-term layup in a de-energized state.
Enclosure
- 2
- b.
The methodology for re-establishing the design life of all WBN Unit 2 cables.
Provide specific details, including examples, on how the cables are being evaluated and the criteria that will be used to adjust the design life. Identify any industry standards used to assess conditions and establish design life.
- c.
The treatment of any issues associated with WBN Unit 1 cables that could have adversely affected WBN Unit 2 cables. Describe the impact of heat generated by WBN Unit 1 cables that are installed next to WBN Unit 2 cables.
- d.
Provide the acceptance criteria that will be used to determine when to replace cables at WBN Unit 2. Describe how meggering of high and low voltage cables is adequate to provide an accurate indication of the condition of these cables.
- e.
Describe how WBN Unit 2 cables that were used during operation of WBN Unit 1 have been monitored and evaluated.
- f.
Describe the program to prevent submergence of cables. If any WBN Unit 2 cables have been subjected to submergence, provide a discussion to address the qualification for this environment and evaluation of the impact from this environment.
- g.
Describe how WBN Unit 2 cables located near Unit 1 equipment have been evaluated to determine if vibration may have adversely impacted these cables.
- h.
Provide a detailed discussion on the impact of ambient relative humidity, and how it will be evaluated for adverse impact on the WBN Unit 2 cables.
- i.
Describe the acceptance criteria for 'significant dust' and how it will be applied/measured.
- 3.
For the components that are not being replaced, describe how the program ensures that environmental qualification requirements for these components were maintained during the period of lay-up.
Mr. Ashok S. Bhatnagar Senior Vice President Nuclear Generation Development and Construction Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WADS BAR NUCLEAR PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING CONSTRUCTION REFURBISHMENT PROGRAM PLAN (TAC NO. MD6581)
Dear Mr. Bhatnagar:
In its letter of December 9, 2008, as supplemented on July 8, 2009, and February 5, 2010, Tennessee Valley Authority (TVA) submitted its Procedure 25402-000-GPP-0000T1216, "Watts Bar Unit 2 Completion Project Refurbishment Program" (T1216). As delineated in Procedure T1216, the program would provide the guidance for the refurbishment of active and passive safety-related, quality-related and nonquality-related equipment. This procedure also identifies requirements that would be used to evaluate preservice degradation of equipment that will not be replaced or refurbished.
The U.S. Nuclear Regulatory Commission (NRC) staff is reviewing the TVA Procedure TI216 in support of the operating license application for Watts Bar Unit 2. The staff has determined that it needs additional information to complete its review. The specific information is detailed in the enclosed request for additional information (RAI). In this regard, the NRC staff requests a response to this RAI within 30 days of receipt of this letter.
If you should have any questions, please contact me at 301-415-1457.
Sincerely, IRA!
Patrick D. Milano, Senior Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-391
Enclosure:
RAI cc w/encl: Distribution via Listserv DISTRIBUTION:
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DRoth LRaghavan DATE 04/16/10 04/16/10 04/16/10 04/16/10 04/19/10 OFFICIAL AGENCY RECORD