ML102010674
| ML102010674 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 07/20/2010 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of Operating Reactor Licensing |
| References | |
| Download: ML102010674 (3) | |
Text
WBN2Public Resource From: Poole, Justin Sent: Tuesday, July 20, 2010 3:26 PM To: wdcrouch@tva.gov Cc: WBN2HearingFile Resource
Subject:
Draft Request for Additional Information Regarding Section 3.11
- Bill, By letters dated November 24, 2009, and January 11, 2010 (ADAMS Accession Nos. ML093370605 and ML100191686), the Tennessee Valley Authority (the licensee) submitted FSAR Amendments 95 and 97 for Watts Bar Nuclear Plant Unit 2 (WBNP2).
The Electrical Engineering Branch has reviewed the information provided for Section 3.11 , Environmental Qualification of Mechanical and Electrical Equipment, and determined that in order to complete its evaluation, additional information is required. Please review to ensure that the RAI questions are understandable, the regulatory basis is clear, there is no proprietary information contained in the RAI, and to determine if the information was previously docketed. If not, we would like to discuss the questions, in draft form below, with you in a conference call. Please also let me know how much time Tennessee Valley Authority needs to respond to the RAI questions.
This e-mail aims solely to prepare you and others for the proposed conference call. It does not convey a formal NRC staff position, and it does not formally request for additional information.
Justin C. Poole Project Manager NRR/DORL/LPWB U.S. Nuclear Regulatory Commission (301)4152048 email: Justin.Poole@nrc.gov
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DRAFT
- 1. On Page 3.11-1 of the FSAR, the licensee stated the following:
Two programs are in place to environmentally qualify safety-related electrical equipment (including cable) and active safety-related mechanical equipment to function or not fail for event mitigation. These programs involve:
(1) Safety-related electrical equipment within the scope of 10 CFR 50.49.
(2) Active, safety-related mechanical equipment located in a harsh environment.
Confirm that the Environmental Qualification program for WBNP2 includes guidance for qualifying 1) nonsafety-related electric equipment whose failure under postulated environmental conditions could prevent satisfactory accomplishment of safety functions identified in 10 CFR 50.49 and 2) required post-accident monitoring equipment.
- 2. Confirm that equipment that is being replaced or refurbished will be qualified as Category 1 as required by 10 CFR 50.49.
1
- 3. On Page 3.11-1 of the FSAR, the licensee stated the following:
A mild environment is defined as a room or building zone where, (3) the event radiation is less than or equal to 1E4 rad.
Clarify that a mild environment for electronic components such as semiconductors or electronic components containing organic material is a total integrated dose less than 1E3 rad, and a mild radiation environment for other equipment is less than 1E4 rad.
- 4. On page 3.11-2 of the FSAR, the licensee stated the following:
Abnormal operating conditions - The environmental service conditions which result from outside temperature excursions, temporary greater than design heat loads, or degraded environmental control operations. This condition can exist for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> per excursion for non-reactor building spaces and will occur less than 1% of the plant life, unless alternate times and %0+
plant life conditions are specifically approved in reference [4] and its associated environmental data drawings.
- a. Explain the basis for increasing the time from 8 to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
- b. Clarify what is meant by %0+ plant life conditions.
- 6. On page 3.11-5 of the FSAR, the licensee stated the following:
Doses were integrated to determine a equipment exposure for a 100-day period after the accident.
Explain the basis for reducing the period of exposure after an accident from one year to 100 days.
DRAFT 2
Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 44 Mail Envelope Properties (19D990B45D535548840D1118C451C74D5A4EB73218)
Subject:
Draft Request for Additional Information Regarding Section 3.11 Sent Date: 7/20/2010 3:25:59 PM Received Date: 7/20/2010 3:26:02 PM From: Poole, Justin Created By: Justin.Poole@nrc.gov Recipients:
"WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>
Tracking Status: None "wdcrouch@tva.gov" <wdcrouch@tva.gov>
Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 3982 7/20/2010 3:26:02 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received: