CNL-15-246, Revision to Commitment on Foxboro Spec 200 Hardware
| ML15337A130 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 12/03/2015 |
| From: | James Shea Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CNL-15-246 | |
| Download: ML15337A130 (5) | |
Text
Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-15-246 December 3, 2015 U.S. Nuclear Regulatory Commission ATTN; Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391 10CFR 50.4
Subject:
Watts Bar Nuclear Plant Unit 2 - Revision to Commitment on Foxboro Spec 200 Hardware
Reference:
TVA Letter to NRC, "Watts Bar Nuclear Plant (WBN) Unit 2 - Instrumentation and Controls Staff Information Requests," dated October 5, 2010
[ML102880525]
The purpose of this letter is to revise the commitment made in Reference 1 with respect to the completion of certain activities related to the installation of Foxboro Spec 200 hardware.
There are Watts Bar Nuclear Plant (WBN) Unit 2 instrument loops that have been and are currently in-service that support WBN Unit 1 operation. These instrument loops are being upgraded to use the Foxboro Spec 200 hardware. The Tennessee Valley Authority (TVA) made a commitment in the referenced letter to complete the installation of the updated hardware in the Unit 2 instrument loops that support Unit 1 operation prior to fuel loading on WBN Unit 2. The Nuclear Regulatory Commission (NRC) acknowledged this commitment in the review of the Foxboro Spec 200 hardware documented in NUREG-0847 Supplement 23, "Safety Evaluation Report Related to the Operation of Watts Bar Nuclear Plant, Unit 2." TVA is notifying the NRC that the commitment is being changed. The revised commitment is to install the Foxboro Spec 200 equipment in the WBN Unit 2 loops that support Unit 1 operation prior to WBN Unit 2 entering Mode 4.
U.S. Nuclear Regulatory Commission CNL-15-246 Page 2 December 3, 2015 Foxboro Spec 200 is updated analog hardware used to replace the existing obsolete hardware with the same functions. The Foxboro Spec 200 hardware is not a system. There are no interconnections between the analog loops unless such interconnections existed prior to the replacement. This is an analog-to-analog upgrade due to equipment obsolescence.
The Foxboro hardware is installed in existing cabinets which require modifications to accept the Foxboro hardware racks.
The instrumentation being replaced that is affected by this commitment change is in the Component Cooling Water (CCS) and Essential Raw Cooling Water (ERCW) systems.
Changing this commitment from prior to fuel load to prior to entry into Mode 4 on WBN Unit 2 does not increase the flow or heat removal requirements on CCS or ERCW from those that have been seen by these systems during the testing on WBN Unit 2 performed to date. The technical evaluations and 10 CFR 50.59 review performed for WBN Unit 1 are unchanged by revising this commitment.
The enclosure provides the revised regulatory commitment. Please address any questions regarding this request to Gordon Arent at 423-365-2004.
Rescrectfully, W. Shea
^ce President, Nuclear Licensing Enclosure; Revised Regulatory Commitment
U.S. Nuclear Regulatory Commission CNL-15-246 Page 3 Decembers, 2015 cc (Enclosure):
U.S. Nuclear Regulatory Commission, Region II NRC Senior Resident Inspector, Watts Bar Nuclear Plant NRC Project Manager - Watts Bar Nuclear Plant
U.S. Nuclear Regulatory Commission CNL-15-246 Page 4 December 3,2015 bcc (Enclosure):
Ben Beasley U.S. Nuclear Regulatory Commission MS OSGSA One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Leonard Wert, Deputy Regional Administrator for Operations U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Geoi^ia 30303-1257
ENCLOSURE Revised Regulatory Commitment The Tennessee Valley Authority will complete the installation of the updated Foxboro Spec 200 hardware in the Watts Bar Nuclear Plant (WBN) Unit2 instrument loops that support WBN Unit 1 operation prior to WBN Unit 2 entry into Mode 4.
Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-15-246 December 3, 2015 U.S. Nuclear Regulatory Commission ATTN; Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391 10CFR 50.4
Subject:
Watts Bar Nuclear Plant Unit 2 - Revision to Commitment on Foxboro Spec 200 Hardware
Reference:
TVA Letter to NRC, "Watts Bar Nuclear Plant (WBN) Unit 2 - Instrumentation and Controls Staff Information Requests," dated October 5, 2010
[ML102880525]
The purpose of this letter is to revise the commitment made in Reference 1 with respect to the completion of certain activities related to the installation of Foxboro Spec 200 hardware.
There are Watts Bar Nuclear Plant (WBN) Unit 2 instrument loops that have been and are currently in-service that support WBN Unit 1 operation. These instrument loops are being upgraded to use the Foxboro Spec 200 hardware. The Tennessee Valley Authority (TVA) made a commitment in the referenced letter to complete the installation of the updated hardware in the Unit 2 instrument loops that support Unit 1 operation prior to fuel loading on WBN Unit 2. The Nuclear Regulatory Commission (NRC) acknowledged this commitment in the review of the Foxboro Spec 200 hardware documented in NUREG-0847 Supplement 23, "Safety Evaluation Report Related to the Operation of Watts Bar Nuclear Plant, Unit 2." TVA is notifying the NRC that the commitment is being changed. The revised commitment is to install the Foxboro Spec 200 equipment in the WBN Unit 2 loops that support Unit 1 operation prior to WBN Unit 2 entering Mode 4.
U.S. Nuclear Regulatory Commission CNL-15-246 Page 2 December 3, 2015 Foxboro Spec 200 is updated analog hardware used to replace the existing obsolete hardware with the same functions. The Foxboro Spec 200 hardware is not a system. There are no interconnections between the analog loops unless such interconnections existed prior to the replacement. This is an analog-to-analog upgrade due to equipment obsolescence.
The Foxboro hardware is installed in existing cabinets which require modifications to accept the Foxboro hardware racks.
The instrumentation being replaced that is affected by this commitment change is in the Component Cooling Water (CCS) and Essential Raw Cooling Water (ERCW) systems.
Changing this commitment from prior to fuel load to prior to entry into Mode 4 on WBN Unit 2 does not increase the flow or heat removal requirements on CCS or ERCW from those that have been seen by these systems during the testing on WBN Unit 2 performed to date. The technical evaluations and 10 CFR 50.59 review performed for WBN Unit 1 are unchanged by revising this commitment.
The enclosure provides the revised regulatory commitment. Please address any questions regarding this request to Gordon Arent at 423-365-2004.
Rescrectfully, W. Shea
^ce President, Nuclear Licensing Enclosure; Revised Regulatory Commitment
U.S. Nuclear Regulatory Commission CNL-15-246 Page 3 Decembers, 2015 cc (Enclosure):
U.S. Nuclear Regulatory Commission, Region II NRC Senior Resident Inspector, Watts Bar Nuclear Plant NRC Project Manager - Watts Bar Nuclear Plant
U.S. Nuclear Regulatory Commission CNL-15-246 Page 4 December 3,2015 bcc (Enclosure):
Ben Beasley U.S. Nuclear Regulatory Commission MS OSGSA One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Leonard Wert, Deputy Regional Administrator for Operations U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Geoi^ia 30303-1257
ENCLOSURE Revised Regulatory Commitment The Tennessee Valley Authority will complete the installation of the updated Foxboro Spec 200 hardware in the Watts Bar Nuclear Plant (WBN) Unit2 instrument loops that support WBN Unit 1 operation prior to WBN Unit 2 entry into Mode 4.