Text

Application to Modify Technical Specifications Regarding Discrepancies in Control Room Ventilation and Other Administrative Changes to the Technical Specifications (WBN-TS-16-03)
	ML16159A208
Person / Time
Site:	Watts Bar
Issue date:	06/07/2016
From:	James Shea; Tennessee Valley Authority
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	CNL-16-031, WBN-TS-16-03
	Download: ML16159A208 (50)
	v • d • e

Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-16-031 June 7, 2016 10 CFR 50.90 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NPF-90 NRC Docket No. 50-390 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391

Subject:

Application to Modify Watts Bar Nuclear Plant Unit 1 and Unit 2 Technical Specifications Regarding Discrepancies in Control Room Ventilation and Other Administrative Changes to the Technical Specifications (WBN-TS-16-03)

In accordance with the provisions of Title 10 of the Code of Federal Regulations (10 CFR) 50.90, "Application for amendment of license, construction permit, or early site permit,"

Tennessee Valley Authority (TVA) is submitting a request for an amendment to Facility Operating License Nos. NPF-90 and NPF-96 for Watts Bar Nuclear Plant (WBN) Unit 1 and Unit 2, respectively.

This license amendment proposes to amend the WBN Unit 2 Technical Specification (TS) 3.7.10 Actions to include a new Condition F with specific shutdown Required Actions and associated completion times when Condition E is not met (i.e., two control room emergency ventilation system trains are inoperable for longer than allowed due to actions taken because of a tornado warning). This proposed change also results in current Conditions F and G being renumbered as Conditions G and H, respectively. These proposed changes are consistent with the WBN Unit 1 TS 3.7.10.

Additional administrative changes are proposed to remove an expired footnote in WBN Unit 1 TS 3.7.11 and to correct inconsistencies in the Applicability statements for WBN Unit 1 TS 3.3.6, TS 3.3.7, TS 3.3.8, TS 3.4.17, TS 3.7.10, TS 3.7.11, and TS 3.7.12, and WBN Unit 2 TS 3.3.7.

U.S. Nuclear Regulatory Commission CNL-16-031 Page 2 June 7, 2016 The enclosure to this letter provides a description of the proposed changes , technical evaluation of the proposed changes , regulatory evaluation , and a discussion of environmental considerations . Attachments 1 and 2 to the enclosure provide the existing TS pages marked-up to show the proposed changes . Attachments 3 and 4 provide the existing TS Bases pages marked-up to show the proposed changes . Attachments 5 and 6 to the enclosure provide the proposed TS pages retyped to show the changes incorporated.

Attachments 7 and 8 to the enclosure provide the proposed TS Bases pages retyped to show the changes incorporated. Changes to the existing TS Bases are provided for information only and will be implemented under the Technical Specification Bases Control Program.

The WBN Plant Operations Review Committee and the TVA Nuclear Safety Review Board have reviewed this proposed change and determined that operation of WBN Units 1 and 2 in accordance with the proposed change will not endanger the health and safety of the public.

TVA has determined that there are no significant hazards considerations associated with the proposed change and that the TS change qualifies for a categorical exclusion from environmental review pursuant to the provisions of 10 CFR 51 .22(c)(9). Additionally , in accordance with 10 CFR 50.91 (b)(1 ), TVA is sending a copy of this letter and enclosure to the Division of Radiological Health - Tennessee State Department of Environment and Conservation .

TVA requests approval of this proposed license amendment by June 30 2017, with implementation within 60 days following the Nuclear Regulatory Commission approval.

There are no new regulatory commitments associated with this submittal. Please address any questions regarding this request to Gordon Arent at (423) 365-2004.

I declare under penalty of perjury that the foregoing is true and correct. Executed on this 7th day of June 2016.

Resp, ~Yd--

J.

Vice President, Nuclear Licensing

Enclosure:

Evaluation of Proposed Change cc: See Page 3

U.S. Nuclear Regulatory Commission CNL-16-031 Page 3 June 7, 2016 cc (Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Watts Bar Nuclear Plant NRC Project Manager - Watts Bar Nuclear Plant Director, Division of Radiological Health - Tennessee State Department of Environment and Conservation

ENCLOSURE Tennessee Valley Authority Watts Bar Nuclear Plant, Units 1 and Unit 2 WBN-TS-16-03 EVALUATION OF PROPOSED CHANGE

Subject:

Application to Modify Watts Bar Nuclear Plant Unit 1 and Unit 2 Technical Specifications Regarding Discrepancies in Control Room Ventilation and Other Administrative Changes to the Technical Specifications (WBN-TS-16-03)

CONTENTS 1.0 Summary Description.................................................................................... E-3 2.0 Detailed Description ...................................................................................... E-3 2.1 Proposed Changes ....................................................................................... E-3 2.1.1 Addition of Specific Shutdown Required Actions .......................................... E-3 2.1.2 Deletion of Expired Footnote ......................................................................... E-4 2.1.3 Administrative Changes to TS Applicability Statements ................................ E-4 2.2 Condition Intended to Resolve ...................................................................... E-4 2.2.1 Addition of Specific Shutdown Required Actions .......................................... E-4 2.2.2 Deletion of Expired Footnote ......................................................................... E-5 2.2.3 Administrative Changes to TS Applicability Statements ................................ E-5 3.0 Technical Evaluation ..................................................................................... E-6 3.1 Control Room Emergency Ventilation System Description ........................... E-6 3.2 Technical Analysis ........................................................................................ E-7 3.2.1 Addition of Specific Shutdown Required Actions .......................................... E-7 3.2.2 Deletion of Expired Footnote ......................................................................... E-8 3.2.3 Administrative Changes to TS Applicability Statements ................................ E-8 4.0 Regulatory Evaluation ................................................................................... E-9 4.1 Applicable Regulatory Requirements/Criteria ............................................... E-9 4.2 Precedent...................................................................................................... E-9 4.3 Significant Hazards Consideration ................................................................ E-9 4.4 Conclusions ................................................................................................ E-11 5.0 Environmental Consideration ...................................................................... E-11 6.0 References.................................................................................................. E-11 CNL-16-031 E-1 of 12

ENCLOSURE ATTACHMENTS

1. Proposed TS Changes (Mark-Ups) for WBN Unit 1

2. Proposed TS Changes (Mark-Ups) for WBN Unit 2

3. Proposed TS Bases Page Changes (Mark-Ups) for WBN Unit 1 (For Information Only)

4. Proposed TS Bases Page Changes (Mark-Ups) for WBN Unit 2 (For Information Only)

5. Proposed TS Changes (Final Typed) for WBN Unit 1

6. Proposed TS Changes (Final Typed) for WBN Unit 2

7. Proposed TS Bases Changes (Final Typed) for WBN Unit 1 (For Information Only)

8. Proposed TS Bases Changes (Final Typed) for WBN Unit 2 (For Information Only)

CNL-16-031 E-2 of 12

ENCLOSURE 1.0

SUMMARY

DESCRIPTION Tennessee Valley Authority (TVA) is requesting a license amendment to amend the Watts Bar Nuclear Plant (WBN) Unit 1 and Unit 2 Technical Specifications (TS) by adding a new Condition F to the WBN Unit 2 TS 3.7.10 Actions with specific shutdown Required Actions and associated completion times when Condition E is not met [i.e., two control room emergency ventilation system (CREVS) trains are inoperable for longer than allowed due to actions taken because of a tornado warning]. The proposed change is consistent with the WBN Unit 1 TS 3.7.10.

In addition, various administrative changes are being made.

2.0 DETAILED DESCRIPTION

2.1 PROPOSED CHANGE

S The proposed changes are described in Sections 2.1.1 through 2.1.3 of this enclosure. Attachments 1 and 2 to the enclosure provide the existing TS pages marked-up to show the proposed changes. Attachments 3 and 4 provide the existing TS Bases pages marked-up to show the proposed changes. Attachments 5 and 6 to the enclosure provide the TS retyped with the proposed changes incorporated.

Attachments 7 and 8 to the enclosure provide the TS Bases retyped with the proposed changes incorporated.

The proposed Bases changes are provided to the Nuclear Regulatory Commission (NRC) for information only.

2.1.1 Addition of Specific Shutdown Required Actions The proposed change revises WBN Unit 2 TS 3.7.10 to add the following new Condition F:

F. Required Action and F.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition E not AND met.

F.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months Because of this proposed change, the following administrative changes to TS 3.7.10 are also being made:

Current Condition F is changed to Condition G and current Required Action F.1 is changed to Required Action G.1.

Current Condition G is changed to Condition H and current Required Action G.1 is changed to Required Action H.1 The proposed changes are consistent with the WBN Unit 1 TS 3.7.10. Conforming changes to the TS Bases have also been made.

CNL-16-031 E-3 of 12

ENCLOSURE 2.1.2 Deletion of Expired Footnote The Completion Time for WBN Unit 1 TS 3.7.11, Condition A for one control room emergency air temperature control system (CREATCS) train inoperable contains the following footnote.

"An allowance is permitted for one CREATCS train to be inoperable for 60 days. This TS provision is only authorized for one entry per train during modification activities planned for the upgrade of the MCR [main control room] chillers beginning no earlier than March 1, 2011 and ending April 30, 2012 and provided compensatory measures are implemented."

Because the timeframe for the above footnote has expired, the proposed change deletes this footnote and the associated asterisk on the 30 day Completion Time.

Conforming changes to the TS Bases have also been made. An additional administrative change to WBN Unit 1 TS 3.7.11 is described in Section 2.1.3 below.

2.1.3 Administrative Changes to TS Applicability Statements WBN Unit 1 TSs 3.3.7, TS 3.7.10, and TS 3.7.11, and WBN Unit 2 TS 3.3.7 contain the following Applicability statement.

Applicability MODES 1, 2, 3, 4, 5, and 6 During movement of irradiated fuel assemblies.

Consistent with the Improved Standard Technical Specifications (ISTS) writer's guide (Reference 1) and NUREG-1431, "Standard Technical Specifications -

Westinghouse Plants" (Reference 2), the proposed change adds a comma following "Mode 6" as shown below.

Applicability MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

Additionally, consistent with References 1 and 2, the proposed change adds a period to the end of the Applicability statements for WBN Unit 1 TS 3.3.6, TS 3.3.8, TS 3.4.17, and TS 3.7.12 as shown below.

TS 3.3.6 Applicability: MODES 1, 2, 3, and 4.

TS 3.3.8 Applicability: According to Table 3.3.8-1.

TS 3.4.17 Applicability: MODES 1, 2, 3, and 4.

TS 3.7.12 Applicability: MODES 1, 2, 3, and 4.

2.2 CONDITION INTENDED TO RESOLVE 2.2.1 Addition of Specific Shutdown Required Actions WBN Unit 2 TS 3.7.10 Condition E applies if two CREVS trains are inoperable in Modes 1, 2, 3, or 4 due to actions taken because of a tornado warning. In this Condition, the unit is required to restore one CREVS train to operable status within eight hours. However, WBN Unit 2 TS 3.7.10 does not specify a Condition and CNL-16-031 E-4 of 12

ENCLOSURE associated Required Actions if Condition E is not met. Therefore, if this Condition is not met, the unit currently would be required to enter Limiting Condition for Operation (LCO) 3.0.3. LCO 3.0.3 applies when an LCO is not met and an associated Action is not provided. However, current Action G states that if two CREVS trains are inoperable in Mode 1, 2, 3, or 4, for reasons other than Condition B or E, to enter LCO 3.0.3 immediately. With respect to current Condition E, the wording of Condition G could imply, in part, that LCO 3.0.3 entry is only for reasons other than current Condition E (i.e., LCO 3.0.3 is not required to be entered if the Required Action and associated Completion Time of Condition E is not met). Therefore, there is a potential conflict in applying the appropriate actions for not meeting the Required Action and associated Completion Time of Condition E.

To resolve this potential conflict, a change is proposed to TS 3.7.10 to add a new Condition F to require specific Required Actions and Completion Times when the Required Action and associated Completion Time of Condition E is not met. This would preclude any misunderstanding by operations personnel as to whether LCO 3.0.3 is required to be entered.

This change is consistent with the WBN Unit 1 TS 3.7.10, which was revised by the license amendment request (LAR) submitted by TVA in Reference 3 and approved by the NRC in Reference 4. At the time that the referenced LAR was submitted, the WBN Unit 2 Technical Specifications were being developed and TVA did not recognize that the revision to the WBN Unit 1 TS 3.7.10 required a similar change to the WBN Unit 2 TS 3.7.10. This error was entered into the TVA Corrective Action Program (CAP).

2.2.2 Deletion of Expired Footnote This proposed change is administrative in nature as the footnote is no longer applicable. Deleting the footnote would remove distracting information. This TS provision was only authorized for one entry per train during modification activities planned for the upgrade of the main control room (MCR) chillers beginning no earlier than March 1, 2011, and ending April 30, 2012.

Because the period of authorization has expired, the footnote is no longer valid and can be removed.

2.2.3 Administrative Changes to TS Applicability Statements Section 2.5.4.b.2 of Reference 1 states, "All Applicability statements are to end with a comma except the last one which ends with a period." Reference 1 was also used to develop the Standard Technical Specifications for Westinghouse Plants (Reference 2).

The Applicability statements for WBN Unit 1 TSs 3.3.7, TS 3.7.10, and TS 3.7.11, and WBN Unit 2 TS 3.3.7 currently state:

"MODES 1, 2, 3, 4, 5, and 6 During movement of irradiated fuel assemblies."

CNL-16-031 E-5 of 12

ENCLOSURE Because there is no comma after the number "6, the Applicability of these LCOs during movement of irradiated fuel assembles could be interpreted as being only during Mode 6 rather than anytime irradiated fuel assemblies were being moved.

To alleviate this potential misinterpretation, TVA is proposing to add a comma after the number "6" consistent with the guidance in References 1 and 2. This condition has been entered into the TVA CAP.

Additionally, TVA identified that a period needed to be added to the end of the Applicability statements for WBN Unit 1 TS 3.3.6, TS 3.3.8, TS 3.4.17, and TS 3.7.12 consistent with the guidance in References 1 and 2.

3.0 TECHNICAL EVALUATION

3.1 CONTROL ROOM EMERGENCY VENTILATION SYSTEM DESCRIPTION The CREVS is described in Sections 6.4 and 9.4.1 of the WBN Unit 1 Updated Final Safety Analysis Report (UFSAR) and the WBN Unit 2 FSAR. The CREVS provides a protected environment from which occupants can control the unit following an uncontrolled release of radioactivity, hazardous chemicals, or smoke. The main control room habitability zone (MCRHZ) is designed to maintain a positive pressure relative to the outdoors and to the adjacent areas, except during a tornado warning, to minimize air inleakage.

The CREVS consists of two independent, redundant trains that circulate and filter air in the MCRHZ (also known as the control room envelope). Each CREVS train consists of a high efficiency particulate air (HEPA) filter, an activated charcoal adsorber section for removal of gaseous activity (principally iodines), and a fan. Two independent, redundant control building emergency pressurization fans, each with their own outside air intake, are also part of the CREVS trains and pressurize the MCRHZ and maintain a minimum 1/8-inch positive pressure relative to the outdoors and adjoining spaces. A cross-connection is provided just upstream of the control building emergency pressurization fans that allows either fan to draw air from either emergency air intake, if necessary.

Actuation of the CREVS occurs automatically upon receipt of a safety injection signal or a control room air intake radiation monitor signal, which provides indication of high radiation in the outside air supply. Actuation of the CREVS in the emergency mode of operation closes the unfiltered outside air intake and unfiltered exhaust dampers and aligns the system for recirculation of the air within the MCRHZ through the redundant trains of air handling units, with a portion of the stream of air directed through HEPA and charcoal filters. The emergency mode also initiates pressurization and filtered ventilation of the air supply to the MCRHZ. Pressurization of the MCRHZ prevents infiltration of unfiltered air from the surrounding areas of the building. A single CREVS train operating at a flow rate of 4000 cubic feet per minute (cfm) +/- 10% (that includes a pressurization flow of < 711 cfm) will pressurize the MCRHZ to a minimum of 0.125 inches water gauge relative to adjacent areas.

However, during a tornado warning, the tornado dampers are closed, which isolates the MCRHZ from the outside air supply, thus precluding the pressurization function of the CREVS.

CNL-16-031 E-6 of 12

ENCLOSURE

3.2 TECHNICAL ANALYSIS

3.2.1 Addition of Specific Shutdown Required Actions WBN Unit 2 TS 3.7.10 Condition E describes the Required Action and Completion Time when two CREVS trains are inoperable in Mode 1, 2, 3, or 4 due to actions taken as a result of a tornado warning. Required Action E.1 requires restoration of one CREVS train to operable status with a Completion Time of eight hours. TVA is proposing to require a unit shutdown within the TS 3.7.10 Actions instead of entering the shutdown requirements of LCO 3.0.3 when Required Action E. 1 and the associated Completion Time are not met. This proposed change is consistent with WBN Unit 1 TS 3.7.10 as described in Section 4.2.

As described in Section 9.4.1.1 of the WBN Unit 1 UFSAR and the WBN Unit 2 FSAR, tornado dampers are closed manually from the MCR to protect the control building from tornado depressurization effects in the event of a tornado warning.

Closing the tornado dampers results in inoperability of both CREVS trains, because the CREVS may not be capable of performing the intended function due to a loss of pressurizing air to the control room when these tornado dampers closed.

In the event of a tornado warning, and if one of the tornado dampers is not restored to an operable status within the eight hour Completion Time, WBN Unit 2 TS 3.7.10 does not provide any specific follow-up actions. Under this scenario, LCO 3.0.3 would be entered. LCO.3.0.3 requires action to be initiated within one hour to be in Mode 3 in seven hours, be in Mode 4 in 13 hours1.50463e-4 days 0.00361 hours 2.149471e-5 weeks 4.9465e-6 months , and be in Mode 5 within 37 hours4.282407e-4 days 0.0103 hours 6.117725e-5 weeks 1.40785e-5 months .

The proposed change adds a specific requirement for a unit shutdown within the TS 3.7.10 Conditions instead of entering LCO 3.0.3 when both CREVS trains are inoperable in Mode 1, 2, 3, or 4 due to actions taken as because of a tornado warning and the Completion Time of eight hours for restoration of at least one CREVS train to OPERABLE status is not met. The proposed new Condition F would apply in this situation, and proposed Required Actions F.1 and F.2 would require the unit to be in MODE 3 within a Completion Time of six hours, and in Mode 5 within a Completion Time of 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months , respectively. This proposed new Condition F provides a similar requirement as the current LCO 3.0.3 Action, in that the unit will be required to be placed in a subcritical condition (Mode 3) within a finite time and in cold shutdown (Mode 5) within a finite time. The proposed new Condition F does not include the additional time (one hour) allowed by LCO 3.0.3 to be in the respective Mode, thus decreasing the Completion Times to be in Mode 3 and Mode 5 by one hour. In addition, the proposed new Condition F does not include the intermediate action to be in Mode 4 (i.e., less than 350 degrees F). This allowance (i.e., to include a specific shutdown action within TS 3.7.10) is consistent with TS 3.7.10 Condition C that applies when the Required Actions of Condition B (that also could affect both CREVS trains) are not met within the associated Completion Time. The change is acceptable because the requirements to shutdown the unit to Mode 3 and Mode 5 are similar to the current requirements (with the exception of the intermediate Required Action and Completion Time to be in Mode 4), and the required Completion Times are 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months less than the existing LCO 3.0.3 Completion Times that currently apply. Deletion of the intermediate action is acceptable because placing the unit in Mode 3 ensures the reactor is subcritical, and the requirement to be in Mode 5 will ensure the unit is cooled down to 200 degrees F.

CNL-16-031 E-7 of 12

ENCLOSURE The proposed changes to WBN Unit 2 TS 3.7.10, resolves a potential conflict in applying the appropriate actions for not meeting the Required Action and associated Completion Time of Condition E. These proposed changes are acceptable because the requirements to shutdown the unit to Mode 3 and Mode 5 are similar to the current requirements. The proposed required Completion Times are 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months less than the existing LCO 3.0.3 Completion Times that currently apply, and do not impact the design and operation of the CREVS. As such, there is no effect on the safety analysis for the CREVS.

3.2.2 Deletion of Expired Footnote In Reference 5, TVA submitted an LAR for a one-time change to WBN Unit 1 TS 3.7.11 that was approved by the NRC in Reference 6. This license amendment was applicable during plant modifications to upgrade the CREATCS chillers, to be implemented during Cycles 10 and 11 beginning December 1, 2010, and ending January 29, 2012. The plant modifications for the CREATCS chillers were necessary due to equipment reliability issues, obsolescence of spare parts, and to allow TVA to comply with future refrigerant availability as defined by 40 CFR 82, "Protection of Stratospheric Ozone."

TVA is proposing to revise WBN Unit 1 TS 3.7.11 to remove the footnote that is no longer valid. This TS provision was only authorized for one entry per train during modification activities planned for the upgrade of the MCR chillers beginning no earlier than March 1, 2011, and ending April 30, 2012.

Because the period of authorization has expired, the footnote is no longer valid and can be removed.

3.2.3 Administrative Changes to TS Applicability Statements The proposed change to add a separating comma to WBN Unit 1 TS 3.3.7, TS 3.7.10, and TS 3.7.11, and WBN Unit 2 TS 3.3.7 is consistent with the guidance in References 1 and 2.

The proposed change to add an ending period to WBN Unit 1 TS 3.3.6, TS 3.3.8, TS 3.4.17, and TS 3.7.12 is also consistent with the guidance in References 1 and 2.

Section 2.5.4.b.2 of Reference 1 states, "All Applicability statements are to end with a comma except the last one which ends with a period." The proposed changes are consistent with this guidance and minimize the potential for misunderstanding and operator error in implementation of the requirements. Because there is no change in the actual Modes in which the LCOs apply, this is an administrative change.

Revising the Applicability statements for these TSs does not change the manner in which the plant is operated and conforms to the guidance in References 1 and 2. No technical change is being proposed.

CNL-16-031 E-8 of 12

ENCLOSURE

4.0 REGULATORY EVALUATION

4.1 APPLICABLE REGULATORY REQUIREMENTS/CRITERIA 10 CFR 50, Appendix A, General Design Criteria (GDC) 19, "Control Room,"

requires that a control room be provided from which actions can be taken to operate the nuclear power unit safely under normal conditions and to maintain it in a safe condition under accident conditions, including loss-of-coolant accidents. Adequate radiation protection shall be provided to permit access and occupancy of the control room under accident conditions without personnel receiving radiation exposures in excess of five rem whole body, or its equivalent to any part of the body, for the duration of the accident.

The requirements of the proposed changes conform to the above regulatory requirement.

4.2 PRECEDENT WBN Unit 1 TS 3.7.10 has the same TS Condition, Required Actions, and Completion Times related to both CREVS trains being inoperable due to actions taken because of a tornado warning. These requirements were approved by the NRC in Reference 4.

Sequoyah Nuclear Plant (SQN) Units 1 and 2 have similar TS Actions related to both CREVS trains being inoperable due to actions taken because of a tornado warning.

Specifically, SQN Units 1 and 2 TS 3.7.10, Condition C allows eight hours to restore one CREVS train to an operable status when two CREVs trains are inoperable due to tornado dampers not in correct position (i.e., open and de-activated) as a result of tornado warning. TS 3.7.10 Condition D applies when the Required Actions and associated Completion Times of Conditions A, B, or C are not met in Modes 1, 2, 3, or 4. The Required Actions for Condition D require the unit be placed in Mode 3 within six hours and Mode 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . This allowance was approved by the NRC in SQN License Amendments 187 and 179 (Reference 7) and reflected in the SQN Improved TS (Reference 8).

4.3 SIGNIFICANT HAZARDS CONSIDERATION TVA requests a license amendment to revise the technical specifications (TS) for Watts Bar Nuclear Plant (WBN) Units 1 and 2. The requested changes would revise the WBN Unit 2 Technical Specification (TS) 3.7.10 to address inoperability of the control room emergency ventilation system (CREVS) due to the actions taken when a tornado warning is declared. The new action statement would require that with both CREVS inoperable due to actions taken as a result of a tornado warning and one train not restore within eight hours to be in at least hot standby within the next six hours and in cold shutdown within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months instead of entering LCO 3.0.3.

Additional administrative changes are proposed to remove an expired footnote in WBN Unit 1 TS 3.7.11 and to correct inconsistencies in the Applicability statements for WBN Unit 1 TS 3.3.6, TS 3.3.7, TS 3.3.8, TS 3.4.17, TS 3.7.10, TS 3.7.11, and TS 3.7.12, and WBN Unit 2 TS 3.3.7.

CNL-16-031 E-9 of 12

ENCLOSURE TVA has evaluated whether or not a significant hazards consideration is involved with the proposed amendment(s) by focusing on the three standards set forth in 10 CFR 50.92, Issuance of amendment, as discussed below:

1. Does the proposed amendment involve a significant increase in the probability or consequences of an accident previously evaluated?

Response: No.

The proposed changes modify WBN Unit 1 TS 3.7.10 to resolve a potential conflict in applying the appropriate actions for not meeting the Required Action and associated Completion Time of Condition E and request administrative changes to correct inconsistencies in TS Applicability statements.

The proposed changes do not affect the structures, systems, or components (SSCs) of the plant, affect plant operations, or any design function or an analysis that verifies the capability of an SSC to perform a design function. No change is being made to any of the previously evaluated accidents in the WBN Unit 1 Updated Final Safety Analysis Report (UFSAR) and the WBN Unit 2 FSAR.

These proposed changes are administrative or provide specific shutdown actions instead of using default shutdown actions.

The proposed changes do not 1) require physical changes to plant systems, structures, or components; 2) prevent the safety function of any safety-related system, structure, or component during a design basis event; 3) alter, degrade, or prevent action described or assumed in any accident described in the WBN Unit 1 UFSAR and the WBN Unit 2 FSAR from being perform because the safety-related systems, structures, or components are not modified; 4) alter any assumptions previously made in evaluating radiological consequences; or 5) affect the integrity of any fission product barrier.

Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed amendment create the possibility of a new or different kind of accident from any accident previously evaluated?

Response: No.

The proposed changes do not introduce any new accident causal mechanisms, since no physical changes are being made to the plant, nor do they impact any plant systems that are potential accident initiators.

Therefore, the proposed change does not create the possibility of a new or different kind of accident from any accident previously evaluated.

CNL-16-031 E-10 of 12

ENCLOSURE

3. Does the proposed amendment involve a significant reduction in a margin of safety?

Response: No.

The margin of safety associated with the acceptance criteria of any accident is unchanged. The proposed changes will have no effect on the availability, operability, or performance of safety-related systems and components. The proposed change will not adversely affect the operation of plant equipment or the function of equipment assumed in the accident analysis.

The proposed amendment does not involve changes to any safety analyses assumptions, safety limits, or limiting safety system settings. The changes do not adversely affect plant-operating margins or the reliability of equipment credited in the safety analyses.

Therefore, the proposed change does not involve a significant reduction in a margin of safety.

Based on the above, TVA concludes that the proposed amendment does not involve a significant hazards consideration under the standards set forth in 10 CFR 50.92 (c), and, accordingly, a finding of no significant hazards consideration is justified.

4.4 CONCLUSION

S In conclusion, based on the considerations discussed above, (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commissions regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

5.0 ENVIRONMENTAL CONSIDERATION

A review has determined that the proposed amendment would change a requirement with respect to installation or use of a facility component located within the restricted area, as defined in 10 CFR 20, or would change an inspection or surveillance requirement. However, the proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluents that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed amendment meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed amendment.

6.0 REFERENCES

1. Technical Specification Task Force (TSTF) letter to NRC, Transmittal of Report TSTF-GG-05-01, Revision 1, 'Writers Guide for Plant-Specific Improved Technical Specifications', dated February 14, 2012 (ML12046A089)

CNL-16-031 E-11 of 12

ENCLOSURE

2. NUREG-1431, "Standard Technical Specifications - Westinghouse Plants,"

Volume 1, Revision 4, issued April 2012 (ML12100A222)

3. TVA letter to NRC, Watts Bar Nuclear Plant (WBN) Unit 1 - Application to Modify Technical Specification 3.7.10, Control Room Emergency Ventilation System (CREVS) (WBN-TS-12-01), dated November 19, 2012 (ML12333A240)

4. NRC letter to TVA, "Watts Bar Nuclear Plant, Unit 1 -Issuance of Amendment to Technical Specification 3.7.10 for Control Room Emergency Ventilation Systems (TAC No. MF0312)," dated January 14, 2014 (ML13338A295)

5. TVA letter to NRC, Watts Bar Nuclear Plant Unit 1 - Technical Specifications Change -Main Control Room Chiller Completion Time Extension, dated February 24, 2010 (ML100570414)

6. NRC letter to TVA, "Watts Bar Nuclear Plant, Unit 1 -Issuance of Amendment Regarding the Main Control Room Chiller Completion Time Extension (TAC No. ME3429)," dated February 8, 2011 (ML110190280)

7. NRC Letter to TVA, "Issuance of Amendments (TAC Nos. M89495 and M89496) (TS 94-05)," dated October 17, 1994 (ML013310385)

8. NRC Letter to TVA, "Sequoyah Nuclear Plant, Units 1 and 2 - Issuance of Amendments for the Conversion to the Improved Technical Specifications with Beyond Scope Issues (TAC Nos. MF3128 and MF3129)," dated September 30, 2015 (ML15238B460)

CNL-16-031 E-12 of 12

ENCLOSURE ATTACHMENT 1 Proposed TS Changes (Mark-Ups) for WBN Unit 1 CNL-16-031

Containment Vent Isolation Instrumentation 3.3.6 3.3 INSTRUMENTATION 3.3.6 Containment Vent Isolation Instrumentation LCO 3.3.6 The Containment Vent Isolation instrumentation for each Function in Table 3.3.6-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS

NOTE---------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One radiation monitoring A.1 Restore the affected channel to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months channel inoperable. OPERABLE status.

(continued)

Watts Bar-Unit 1 3.3-52 Amendment 35, 92

CREVS Actuation Instrumentation 3.3.7 3.3 INSTRUMENTATION 3.3.7 Control Room Emergency Ventilation System (CREVS) Actuation Instrumentation LCO 3.3.7 The CREVS actuation instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS

NOTE----------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one CREVS train in 7 days one channel or train emergency radiation protection inoperable. mode.

(continued)

Watts Bar-Unit 1 3.3-57

ABGTS Actuation Instrumentation 3.3.8 3.3 INSTRUMENTATION 3.3.8 Auxiliary Building Gas Treatment System (ABGTS) Actuation Instrumentation LCO 3.3.8 The ABGTS actuation instrumentation for each Function in Table 3.3.8-1 shall be OPERABLE.

APPLICABILITY: According to Table 3.3.8-1.

ACTIONS

NOTE------------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one ABGTS train in 7 days one channel or train operation.

inoperable.

B. One or more Functions with B.1.1 Place one ABGTS train in Immediately two channels or two trains operation.

inoperable.

AND B.1.2 Enter applicable Conditions Immediately and Required Actions of LCO 3.7.12, "Auxiliary Building Gas Treatment System (ABGTS)," for one train made inoperable by inoperable actuation instrumentation.

OR (continued)

Watts Bar-Unit 1 3.3-61

SG Tube Integrity 3.4.17 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.17 STEAM GENERATOR (SG) TUBE INTEGRITY LCO 3.4.17 SG tube integrity shall be maintained AND All SG tubes satisfying the tube repair criteria shall be plugged in accordance with the Steam Generator Program.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS

NOTE--------------------------------------------------------

Separate Condition entry is allowed for each SG tube.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more SG tubes A.1 Verify tube integrity of the 7 days satisfying the tube repair affected tube(s) is maintained criteria and not plugged in until the next refueling outage accordance with the Steam or SG tube inspection.

Generator Program AND A.2 Plug the affected tube(s) in Prior to entering accordance with the Steam MODE 4 following Generator Program. the next refueling outage or SG tube inspection B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A not met. AND OR B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months SG tube integrity not maintained Watts Bar-Unit 1 3.4-43 Amendment 65

CREVS 3.7.10 3.7 PLANT SYSTEMS 3.7.10 Control Room Emergency Ventilation System (CREVS)

LCO 3.7.10 Two CREVS trains shall be OPERABLE.

NOTE------------------------------------------------

The control room envelope (CRE) boundary may be opened intermittently under administrative control.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One CREVS train A.1 Restore CREVS train to 7 days inoperable for reasons OPERABLE status.

other than Condition B.

B. One or more CREVS trains B.1 Initiate action to implement Immediately inoperable due to mitigating actions.

inoperable CRE boundary in Mode 1, 2, 3, or 4. AND B.2 Verify mitigating actions ensure 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months CRE occupant exposures to radiological and chemical hazards will not exceed limits and CRE occupants are protected from smoke hazards.

AND B.3 Restore CRE boundary to 90 days OPERABLE status.

(continued)

Watts Bar-Unit 1 3.7-22 Amendment 35, 70, xx

CREATCS 3.7.11 3.7 PLANT SYSTEMS 3.7.11 Control Room Emergency Air Temperature Control System (CREATCS)

LCO 3.7.11 Two CREATCS trains shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One CREATCS train A.1 Restore CREATCS train to 30 days*

inoperable. OPERABLE status.

B. Required Action and associated B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Completion Time of Condition A not met in MODE 1, 2, 3, or 4. AND B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months C. Required Action and associated C.1 Place OPERABLE CREATCS Immediately Completion Time of Condition A train in operation.

not met in MODE 5 or 6, or during movement of irradiated OR fuel assemblies.

C.2 Suspend movement of irradiated fuel assemblies. Immediately (continued)

An allowance is permitted for one CREATCS train to be inoperable for 60 days. This TS provision is only authorized for one entry per train during modification activities planned for the upgrade of the MCR chillers beginning no earlier than March 1, 2011 and ending April 30, 2012 and provided compensatory measures are implemented.

Watts Bar-Unit 1 3.7-25 Amendment 35, 85, xx

ABGTS 3.7.12 3.7 PLANT SYSTEMS 3.7.12 Auxiliary Building Gas Treatment System (ABGTS)

LCO 3.7.12 Two ABGTS trains shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.,

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One ABGTS train A.1 Restore ABGTS train to 7 days inoperable. OPERABLE status.

B. Required Action B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and associated Completion Time of AND Condition A not met.

B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months OR Two ABGTS trains inoperable.

Watts Bar-Unit 1 3.7-27 Amendment No. 92

ENCLOSURE ATTACHMENT 2 Proposed TS Changes (Mark-Ups) for WBN Unit 2 CNL-16-031

CREVS Actuation Instrumentation 3.3.7 3.3 INSTRUMENTATION 3.3.7 Control Room Emergency Ventilation System (CREVS) Actuation Instrumentation LCO 3.3.7 The CREVS actuation instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS

NOTE-------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one CREVS train in 7 days one channel or train emergency radiation inoperable. protection mode.

(continued)

Watts Bar - Unit 2 3.3-59 Amendment xx

CREVS 3.7.10 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. Required Action and C.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A or B AND not met in MODE 1, 2, 3, or 4. C.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months D. Required Action and D.1 Place OPERABLE Immediately associated Completion CREVS train in Time of Condition A not met emergency mode.

in MODE 5 or 6, or during movement of irradiated fuel OR assemblies.

D.2 Suspend movement of Immediately irradiated fuel assemblies.

E. Two CREVS trains E.1 Restore one CREVS train 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months inoperable in MODE 1, 2, 3, to OPERABLE status.

or 4 due to actions taken as a result of a tornado warning.

F. Required Action and F.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition E not AND met.

F.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months (continued)

Watts Bar - Unit 2 3.7-22 Amendment xx

CREVS 3.7.10 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME F.G. Two CREVS trains FG.1 Suspend movement of Immediately inoperable in MODE 5 or 6, irradiated fuel assemblies or during movement of irradiated fuel assemblies.

OR One or more CREVS trains inoperable due to inoperable CRE boundary in MODE 5 or 6, or during movement of irradiated fuel assemblies.

G.H. Two CREVS trains GH.1 Enter LCO 3.0.3. Immediately inoperable in MODE 1, 2, 3, or 4 for reasons other than Condition B or E.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.10.1 Operate each CREVS train for 15 minutes. 31 days SR 3.7.10.2 Perform required CREVS filter testing in accordance In accordance with with the Ventilation Filter Testing Program (VFTP). the VFTP SR 3.7.10.3 Verify each CREVS train actuates on an actual or 18 months simulated actuation signal.

SR 3.7.10.4 Perform required CRE unfiltered air inleakge testing In accordance with in accordance with the Control Room Envelope the Control Room Habitability Program. Envelope Habitability Program Watts Bar - Unit 2 3.7-23 Amendment xx

ENCLOSURE ATTACHMENT 3 Proposed TS Bases Changes (Mark-Ups) for WBN Unit 1 CNL-16-031

CREATCS B 3.7.11 BASES APPLICABLE heat loads from the control room, which include consideration of equipment SAFETY ANALYSES heat loads and personnel occupancy requirements, to ensure equipment (continued) OPERABILITY (Ref. 3).

The CREATCS satisfies Criterion 3 of the NRC Policy Statement.

LCO Two independent and redundant trains of the CREATCS are required to be OPERABLE to ensure that at least one is available, assuming a single failure disabling the other train. Total system failure could result in the equipment operating temperature exceeding limits in the event of an accident.

The CREATCS is considered to be OPERABLE when the individual components necessary to maintain the control room temperature are OPERABLE in both trains. These components include the chillers, AHUs, and associated temperature control instrumentation. In addition, the CREATCS must be operable to the extent that air circulation can be maintained.

APPLICABILITY In MODES 1, 2, 3, 4, 5, and 6, and during movement of irradiated fuel assemblies, the CREATCS must be OPERABLE to ensure that the control room temperature will not exceed equipment operational requirements following isolation of the control room.

In MODE 5 or 6, CREATCS is required during a control room isolation following a waste gas decay tank rupture.

ACTIONS A.1 With one CREATCS train inoperable, action must be taken to restore OPERABLE status within 30 days. In this Condition, the remaining OPERABLE CREATCS train is adequate to maintain the control room temperature within limits. However, the overall reliability is reduced because a single failure in the OPERABLE CREATCS train could result in loss of CREATCS function. The 30 day Completion Time is based on the low probability of an event requiring control room isolation, the consideration that the remaining train can provide the required protection, and that alternate safety or nonsafety related cooling means are available.

(continued)

Watts Bar-Unit 1 B 3.7-59 Revision 64 Amendment 50

CREATCS B 3.7.11 BASES ACTIONS A.1 (continued)

During modification activities to replace the CREATCS chillers, an allowance is permitted for one CREATCS train to be inoperable for 60 days provided the following compensatory measures are in place:

A temporary chilled water package will be installed and maintained in a standby condition. During the initial installation, the chiller skids and chilled water pumps will be stationed in the yard with the chilled water lines filled and vented at the manifolds in the Control Building Mechanical Equipment Room located on Elevation 755.0 and the Shutdown Board Room Mechanical Equipment Rooms located on Elevation 757.0. Final connection of the chilled water hoses to the SDBR or MCR AHUs will not occur until that particular HVAC train is taken out of service for chiller replacement. All necessary hardware, hoses, and fittings will be stationed at the AHUs for rapid deployment in order to connect, fill and vent the temporary chilled water hoses to the AHUs. Procedures will be provided as part of Work Order documents to include instructions for startup, operation, preventative maintenance, and shutdown of the temporary cooling equipment.

Qualified personnel will be provided training on these procedures. Furthermore, to provide additional defense-in-depth, the following requirements would also be implemented:

1. If a temporary chilled water system hose breaks in the Control Building during the timeframe that the temporary equipment is installed, the two manual isolation ball valves located at the MCRHZ boundary will be closed immediately. Qualified personnel will be capable of closing the valves and will be stationed in the area whenever the valves are in the Open position and the temporary cooling system is in service.

2. If a temporary chilled water system hose breaks in the Auxiliary Building or Shutdown Board Room during the timeframe that the temporary equipment is installed, the manual isolation valves will be closed immediately. Qualified personnel will be capable of closing the valves and will be stationed in the area whenever the valves are in the Open position and the temporary cooling system is in service.

3. Due to lack of operating data, the availability or reliability of the new MCR chiller packages are unknown. To compensate for this uncertainty the new train-B chiller packages will be operated for a minimum of 2 weeks prior to removing the train-A MCR chillers from service for replacement.

4. During replacement of the MCR chillers, no planned maintenance activity, except for SRs 3.8.1.2, 3.8.1.3, and 3.8.1.7 that could impact the OPERABILITY of the DGs that provide emergency power to the OPERABLE MCR chiller train will be performed.

This TS provision is only authorized for one entry per train during modification activities planned for the upgrade of the MCR chillers beginning no earlier than March 1, 2011 and ending April 30, 2012.

(continued)

Watts Bar-Unit 1 B 3.7-59a Revision 64, 107 Amendment 50, 85

ENCLOSURE ATTACHMENT 4 Proposed TS Bases Changes (Mark-Ups) for WBN Unit 2 (For Information Only)

CNL-16-031

CREVS B 3.7.10 BASES ACTIONS D.1 and D.2 (continued)

An alternative to Required Action D.1 is to immediately suspend activities that could result in a release of radioactivity that might require isolation of the CRE. This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel to a safe position.

E.1 If both CREVS trains are inoperable in MODE 1, 2, 3, or 4, due to actions taken as a result of a tornado, the CREVS may not be capable of performing the intended function because of loss of pressurizing air to the control room. At least one train must be restored to OPERABLE status within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or the unit must be placed in a MODE that minimizes accident risk. To achieve this status, the plant must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months restoration time is considered reasonable considering the low probability of occurrence of a design basis accident concurrent with a tornado warning.

The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.

F.1 and F.2 If one CREVS train cannot be restored to OPERABLE status within the associated Completion Time of Condition E, the plant must be placed in a MODE that minimizes accident risk. To achieve this status, the plant must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.

FG.1 In MODE 5 or 6, or during movement of irradiated fuel assemblies with two CREVS trains inoperable or with one or more CREVS trains inoperable due to an inoperable CRE boundary, action must be taken immediately to suspend activities that could result in a release of radioactivity that might require isolation of the CRE. This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel to a safe position.

(continued)

Watts Bar - Unit 2 B 3.7-55

CREVS B 3.7.10 BASES ACTIONS GH.1 (continued)

If both CREVS trains are inoperable in MODE 1, 2, 3, or 4, for reasons other than Condition B or Condition E the CREVS may not be capable of performing the intended function and the plant is in a condition outside the accident analyses. Therefore, LCO 3.0.3 must be entered immediately.

SURVEILLANCE SR 3.7.10.1 REQUIREMENTS Standby systems should be checked periodically to ensure that they function properly. As the environment and normal operating conditions on this system are not too severe, testing each train once every month provides an adequate check of this system. The systems need only be operated for 15 minutes to demonstrate the function of the system. The 31-day Frequency is based on the reliability of the equipment and the two train redundancy.

SR 3.7.10.2 This SR verifies that the required CREVS testing is performed in accordance with the Ventilation Filter Testing Program (VFTP). The CREVS filter tests are in accordance with Regulatory Guide 1.52 (Ref. 6).

The VFTP includes testing the performance of the HEPA filter, charcoal adsorber efficiency, minimum flow rate, and the physical properties of the activated charcoal. Specific test Frequencies and additional information are discussed in detail in the VFTP.

SR 3.7.10.3 This SR verifies that each CREVS train starts and operates on an actual or simulated actuation signal. The Frequency of 18 months is based on industry operating experience and is consistent with the typical refueling cycle.

(continued)

Watts Bar - Unit 2 B 3.7-56

ENCLOSURE ATTACHMENT 5 Proposed TS Changes (Final Typed) for WBN Unit 1 CNL-16-031

Containment Vent Isolation Instrumentation 3.3.6 3.3 INSTRUMENTATION 3.3.6 Containment Vent Isolation Instrumentation LCO 3.3.6 The Containment Vent Isolation instrumentation for each Function in Table 3.3.6-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS

NOTE---------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One radiation monitoring A.1 Restore the affected channel to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months channel inoperable. OPERABLE status.

(continued)

Watts Bar-Unit 1 3.3-52 Amendment 35, 92

CREVS Actuation Instrumentation 3.3.7 3.3 INSTRUMENTATION 3.3.7 Control Room Emergency Ventilation System (CREVS) Actuation Instrumentation LCO 3.3.7 The CREVS actuation instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS

NOTE----------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one CREVS train in 7 days one channel or train emergency radiation protection inoperable. mode.

(continued)

Watts Bar-Unit 1 3.3-57

ABGTS Actuation Instrumentation 3.3.8 3.3 INSTRUMENTATION 3.3.8 Auxiliary Building Gas Treatment System (ABGTS) Actuation Instrumentation LCO 3.3.8 The ABGTS actuation instrumentation for each Function in Table 3.3.8-1 shall be OPERABLE.

APPLICABILITY: According to Table 3.3.8-1.

ACTIONS

NOTE------------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one ABGTS train in 7 days one channel or train operation.

inoperable.

B. One or more Functions with B.1.1 Place one ABGTS train in Immediately two channels or two trains operation.

inoperable.

AND B.1.2 Enter applicable Conditions Immediately and Required Actions of LCO 3.7.12, "Auxiliary Building Gas Treatment System (ABGTS)," for one train made inoperable by inoperable actuation instrumentation.

OR (continued)

Watts Bar-Unit 1 3.3-61

SG Tube Integrity 3.4.17 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.17 STEAM GENERATOR (SG) TUBE INTEGRITY LCO 3.4.17 SG tube integrity shall be maintained AND All SG tubes satisfying the tube repair criteria shall be plugged in accordance with the Steam Generator Program.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS

NOTE--------------------------------------------------------

Separate Condition entry is allowed for each SG tube.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more SG tubes A.1 Verify tube integrity of the 7 days satisfying the tube repair affected tube(s) is maintained criteria and not plugged in until the next refueling outage accordance with the Steam or SG tube inspection.

Generator Program AND A.2 Plug the affected tube(s) in Prior to entering accordance with the Steam MODE 4 following Generator Program. the next refueling outage or SG tube inspection B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A not met. AND OR B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months SG tube integrity not maintained Watts Bar-Unit 1 3.4-43 Amendment 65

CREVS 3.7.10 3.7 PLANT SYSTEMS 3.7.10 Control Room Emergency Ventilation System (CREVS)

LCO 3.7.10 Two CREVS trains shall be OPERABLE.

NOTE------------------------------------------------

The control room envelope (CRE) boundary may be opened intermittently under administrative control.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One CREVS train A.1 Restore CREVS train to 7 days inoperable for reasons OPERABLE status.

other than Condition B.

B. One or more CREVS trains B.1 Initiate action to implement Immediately inoperable due to mitigating actions.

inoperable CRE boundary in Mode 1, 2, 3, or 4. AND B.2 Verify mitigating actions ensure 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months CRE occupant exposures to radiological and chemical hazards will not exceed limits and CRE occupants are protected from smoke hazards.

AND B.3 Restore CRE boundary to 90 days OPERABLE status.

(continued)

Watts Bar-Unit 1 3.7-22 Amendment 35, 70, xx

CREATCS 3.7.11 3.7 PLANT SYSTEMS 3.7.11 Control Room Emergency Air Temperature Control System (CREATCS)

LCO 3.7.11 Two CREATCS trains shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One CREATCS train A.1 Restore CREATCS train to 30 days inoperable. OPERABLE status.

B. Required Action and associated B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Completion Time of Condition A not met in MODE 1, 2, 3, or 4. AND B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months C. Required Action and associated C.1 Place OPERABLE CREATCS Immediately Completion Time of Condition A train in operation.

not met in MODE 5 or 6, or during movement of irradiated OR fuel assemblies.

C.2 Suspend movement of irradiated fuel assemblies. Immediately (continued)

Watts Bar-Unit 1 3.7-25 Amendment 35, 85, xx

ABGTS 3.7.12 3.7 PLANT SYSTEMS 3.7.12 Auxiliary Building Gas Treatment System (ABGTS)

LCO 3.7.12 Two ABGTS trains shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One ABGTS train A.1 Restore ABGTS train to 7 days inoperable. OPERABLE status.

B. Required Action B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and associated Completion Time of AND Condition A not met.

B.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months OR Two ABGTS trains inoperable.

Watts Bar-Unit 1 3.7-27 Amendment No. 92

ENCLOSURE ATTACHMENT 6 Proposed TS Changes (Final Typed) for WBN Unit 2 CNL-16-031

CREVS Actuation Instrumentation 3.3.7 3.3 INSTRUMENTATION 3.3.7 Control Room Emergency Ventilation System (CREVS) Actuation Instrumentation LCO 3.3.7 The CREVS actuation instrumentation for each Function in Table 3.3.7-1 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, 4, 5, and 6, During movement of irradiated fuel assemblies.

ACTIONS

NOTE-------------------------------------------------------------

Separate Condition entry is allowed for each Function.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more Functions with A.1 Place one CREVS train in 7 days one channel or train emergency radiation inoperable. protection mode.

(continued)

Watts Bar - Unit 2 3.3-59 Amendment xx

CREVS 3.7.10 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. Required Action and C.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A or B AND not met in MODE 1, 2, 3, or 4. C.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months D. Required Action and D.1 Place OPERABLE Immediately associated Completion CREVS train in Time of Condition A not met emergency mode.

in MODE 5 or 6, or during movement of irradiated fuel OR assemblies.

D.2 Suspend movement of Immediately irradiated fuel assemblies.

E. Two CREVS trains E.1 Restore one CREVS train 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months inoperable in MODE 1, 2, 3, to OPERABLE status.

or 4 due to actions taken as a result of a tornado warning.

F. Required Action and F.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition E not AND met.

F.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months (continued)

Watts Bar - Unit 2 3.7-22 Amendment xx

CREVS 3.7.10 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME G. Two CREVS trains G.1 Suspend movement of Immediately inoperable in MODE 5 or 6, irradiated fuel assemblies or during movement of irradiated fuel assemblies.

OR One or more CREVS trains inoperable due to inoperable CRE boundary in MODE 5 or 6, or during movement of irradiated fuel assemblies.

H. Two CREVS trains H.1 Enter LCO 3.0.3. Immediately inoperable in MODE 1, 2, 3, or 4 for reasons other than Condition B or E.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.10.1 Operate each CREVS train for 15 minutes. 31 days SR 3.7.10.2 Perform required CREVS filter testing in accordance In accordance with with the Ventilation Filter Testing Program (VFTP). the VFTP SR 3.7.10.3 Verify each CREVS train actuates on an actual or 18 months simulated actuation signal.

SR 3.7.10.4 Perform required CRE unfiltered air inleakge testing In accordance with in accordance with the Control Room Envelope the Control Room Habitability Program. Envelope Habitability Program Watts Bar - Unit 2 3.7-23 Amendment xx

ENCLOSURE ATTACHMENT 7 Proposed TS Bases Changes (Final Typed) for WBN Unit 1 (For Information Only)

CNL-16-031

CREATCS B 3.7.11 BASES THIS PAGE INTENTIONALY LEFT BLANK (continued)

Watts Bar-Unit 1 B 3.7-59a Revision 64, 107 Amendment 50, 85

ENCLOSURE ATTACHMENT 8 Proposed TS Bases Changes (Final Typed) for WBN Unit 2 (For Information Only)

CNL-16-031

CREVS B 3.7.10 BASES ACTIONS D.1 and D.2 (continued)

An alternative to Required Action D.1 is to immediately suspend activities that could result in a release of radioactivity that might require isolation of the CRE. This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel to a safe position.

E.1 If both CREVS trains are inoperable in MODE 1, 2, 3, or 4, due to actions taken as a result of a tornado, the CREVS may not be capable of performing the intended function because of loss of pressurizing air to the control room. At least one train must be restored to OPERABLE status within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or the unit must be placed in a MODE that minimizes accident risk. To achieve this status, the plant must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months restoration time is considered reasonable considering the low probability of occurrence of a design basis accident concurrent with a tornado warning.

The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.

F.1 and F.2 If one CREVS train cannot be restored to OPERABLE status within the associated Completion Time of Condition E, the plant must be placed in a MODE that minimizes accident risk. To achieve this status, the plant must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.

G.1 In MODE 5 or 6, or during movement of irradiated fuel assemblies with two CREVS trains inoperable or with one or more CREVS trains inoperable due to an inoperable CRE boundary, action must be taken immediately to suspend activities that could result in a release of radioactivity that might require isolation of the CRE. This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel to a safe position.

(continued)

Watts Bar - Unit 2 B 3.7-55

CREVS B 3.7.10 BASES ACTIONS H.1 (continued)