ML103140655

2010/10/21 Watts Bar 2 OL - FW: NRC Information Requests

ML103140655
Person / Time
Site:	Watts Bar
Issue date:	10/21/2010
From:	Office of Nuclear Reactor Regulation
To:	Division of Operating Reactor Licensing
References
Download: ML103140655 (5)

Text

1 WBN2Public Resource From: Poole, Justin Sent: Thursday, October 21, 2010 4:55 PM To: Garg, Hukam; Singh, Gursharan Cc: WBN2HearingFile Resource

Subject:

FW: NRC Information Requests See below JustinC.PooleProjectManagerNRR/DORL/LPWBU.S.NuclearRegulatoryCommission(301)4152048email:Justin.Poole@nrc.gov From: Crouch, William D [1]

Sent: Thursday, October 21, 2010 4:42 PM To: Poole, Justin Cc: Hilmes, Steven A; Clark, Mark Steven; Knuettel, Edward Terry

Subject:

FW: NRC Information Requests Seebelowresponsetoyourquestionsentyesterdayviaemail.William D. (Bill) Crouch(423)365 2004WBN(256)777 7676Cell FSAR Table 7.5-2 variable 4 provides the design information specific to the Containment High Range Radiation Monitors as excerpted below. The type/category design requirements are provided in FSAR Section 7.5.1.4.3 excerpted below. Since the highest classification is A1, the design criteria for the C3 and E1 variables is not included. These are the same requirements that are included in WB-DC-30-7, Post Accident Monitoring Instrumentation which was submitted on TVA Letter to NRC dated June 18, 2010, WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - INSTRUMENTATION AND CONTROLS STAFF INFORMATION REQUESTS.

There is no response time requirement for the Containment High Range Radiation Monitors.

FSAR Table 7.5-2 Deviation 36 is applicable to Variable 4 and is included in this response.

Additional information is included in the procurement specifications which are scheduled to be provided on the October 29, 2010 letter. These documents are too large to transmit via e-mail.

Variable Number Variable Name Type /

Category Redundant Channels Minimum Range From Maximum Range To Range Units Notes 4. Containment Radiation A1 C3 E1 P1 P2 2 Upper 2 Lower 1 1.0E7 R/hr Deviation

1. 36 7.5.1.4.3 Design Criteria For Category 1 Variables 2 (A) Redundant Class 1E qualified continuous indication of these variables has been provided. Qualification applies from the sensor to the display. The variables have been provided with a minimum of two independent channels (PAM 1 and PAM 2) for monitoring each variable. These two redundant channels allow the operator to deduce actual plant conditions.

Where failure of a channel would present ambiguous or confusing information to the operator, preventing the operator from taking action or misleading the operator, an additional redundant (PAM 3) channel has been provided. The PAM 3 channel has been qualified to the same requirements as the first two channels. Table 7.5-2 lists the redundancy requirements for each Category 1 variable.

DEVIATION 36

VARIABLE 4 Containment Area Radiation, High Range DEVIATION FROM RG 1.97 GUIDANCE

Note 7 of RG 1.97, Revision 2 for the subject variable states, "detectors should respond to gamma photons within any energy range from 60 KeV to 3 MeV with an energy response accuracy of 20% at any specific photon energy from 0.1 MeV to 1 MeV. Overall system accuracy should be within a factor of 2 over the entire range. TVA meets the requirements of RG 1.97, Revision 3 Note 7 for the subject variable, which states, "Detectors should respond to gamma radiation photons within any range from 60 KeV to 3 MeV with a dose rate response accuracy within a factor of 2 over the entire range."

JUSTIFICATION It is acceptable to meet the requirements of RG 1.97, Revision 3.

From: Poole, Justin tin.Poole@nrc.gov

Sent: Wednesday, October 20, 2010 4:25 PM To: Crouch, William D Cc: WBN2HearingFile Resource

Subject:

FW: NRC Information Requests Please see below.

JustinC.PooleProjectManagerNRR/DORL/LPWBU.S.NuclearRegulatoryCommission(301)4152048email:Justin.Poole@nrc.gov From: Singh, Gursharan Sent: Monday, October 18, 2010 1:00 PM To: Poole, Justin Cc: Garg, Hukam

Subject:

RE: NRC Information Requests Justin, 3I do not find design criteria within this document. This document covers all radiation monitors. Have TVA look at the following document to see if it contains criteria for the containment high range area monitors (referenced in the document in your email).

8.3.5 TVA WB-DC-30-7, Post Accident Monitoring Instrumentation

FSAR Section 7.5.1 contains the general design criteria for all Category 1 radiation monitors. I am looking for a design document that includes containment high range radiation monitor design requirements such as ranges, accuracy, maximum acceptable response time for the system etc.

Gush

From: Poole, Justin Sent: Friday, October 15, 2010 10:56 AM To: Singh, Gursharan Cc: Garg, Hukam; WBN2HearingFile Resource

Subject:

FW: NRC Information Requests Gush, Please see below. Please note that if you intend to use any of this information in your safety evaluation, then TVA needs to send this on the docket (this is not official) so let me know. Thanks.

JustinC.PooleProjectManagerNRR/DORL/LPWBU.S.NuclearRegulatoryCommission(301)4152048email:Justin.Poole@nrc.gov From: Knuettel, Edward Terry [2]

Sent: Friday, October 15, 2010 10:42 AM To: Poole, Justin Cc: Clark, Mark Steven; Hilmes, Steven A; Crouch, William D

Subject:

NRC Information Requests Justin, the attached information was requested by Gursharan Singh. Please contact me or Steve Clark with any questions/comments regarding these responses.

Thanks ***************************************************************

Terry Knuettel WBN Unit 2 Licensing EQB 1B-WBN [Licensing Trailer] 423-365-7750, fax 423-365-3833 From: Clark, Mark Steven Sent: Friday, October 15, 2010 9:48 AM To: Knuettel, Edward Terry Cc: Hilmes, Steven A

Subject:

NRC Information Requests Terry:

4 Please forward to Justin Poole for Gursharan Singh.

1. Please send the Radiation Monitoring Design Criteria document.

Response: Design Criteria WB-DC-40-24 Rev. 21 is attached. 2. Why isn't the Loose Part Monitoring System included in FSAR Section 3.10 when it is designed to withstand an OBE?

Response: The FSAR Section 3.10 title is SEISMIC DESIGN OF CATEGORY I INSTRUMENTATION AND ELECTRICAL EQUIPMENT. Since the Loose Part Monitoring System is not a Category 1 system, it is not included in the scope of 3.10. FSAR Section 7.6.7 provides the information the seismic design of the system which is consistent with the requirements of TVA Design Criteria, WB-DC-30-31, LOOSE PARTS MONITORING SYSTEM.

3. Question on Responses to RAI Matrix Items 54 and 55. What is Reference 3?

Response:

Reference 3 is TVA Design Criteria WB-DC-40-54, ENVIRONMENTAL QUALIFICATION TO 10CFR50.49, which provides the definition of mild and harsh environments. 4. Question on RAI Matrix item 318. Is 1QR or QR correct for document number 04508905-QR?

Response: 04508905-QR is correct. The response will be revised before it is submitted.

Please let me know if you need either of the referenced design criteria documents submitted on the docket.

Regards, Steve Steve Clark Bechtel Power Corp.Control SystemsWatts Bar 2 Completion ProjectPhone: 865.632.6547Fax: 865.632.2524e-mail: msclark0@tva.gov Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 176 Mail Envelope Properties (19D990B45D535548840D1118C451C74D6FD3723A31)

Subject:

FW: NRC Information Requests Sent Date: 10/21/2010 4:55:03 PM Received Date: 10/21/2010 4:56:21 PM From: Poole, Justin Created By: Justin.Poole@nrc.gov Recipients: "WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>

Tracking Status: None "Garg, Hukam" <Hukam.Garg@nrc.gov>

Tracking Status: None "Singh, Gursharan" <Gursharan.Singh@nrc.gov> Tracking Status: None

Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 7511 10/21/2010 4:56:21 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received: