Text

Response to NRC Request for Additional Information Regarding TSTF-498, Revision 0, Risk-Informed Containment Isolation Valve Completion Times (BAW-2461), Dated June 13, 2007
	ML072840444
Person / Time
Site:	Technical Specifications Task Force
Issue date:	10/10/2007
From:	David Bice, Gambrell R, Joseph Messina, Yates B; Babcock & Wilcox, BWR Owners Group, Combustion Engineering Owners Group, PWR Owners Group, Technical Specifications Task Force
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	BAW-2461, TSTF-07-27
	Download: ML072840444 (30)
	v • d • e

TECHNICAL SPECIFICATIONS TASK FORCE TSTF A JOINT OWNERS GROUP ACTIVITY October 10, 2007 TSTF-07-27 PROJ0753 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Response to NRC Request for Additional Information Regarding TSTF-498, Revision 0, "Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)," dated June 13, 2007.

REFERENCES:

1. Letter from Timothy Kobetz (NRC) to the Technical Specifications Task Force, requesting additional information regarding TSTF-498, Revision 0, "Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)," dated June 13, 2007.

2. Letter from TSTF to NRC Document Control Desk, "Revision to Scheduled Response Date for NRC Request for Additional Information Regarding TSTF-498, Revision 0, 'Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)',: dated September 24, 2007.

Dear Sir or Madam:

In Reference 1, the NRC provided a Request for Additional Information (RAI) regarding TSTF-498, Revision 0, "Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)." In Reference 2, the TSTF informed the NRC of a revised schedule for responding to the RAI. This letter responds to the NRC's referenced request.

In responding to the RAI, the TSTF identified changes to TSTF-498. Revision 1 of TSTF-498 is attached.

Any NRC review fees associated with the review of TSTF-498 should continue to be billed to the Pressurized Water Reactor Owners Group.

The TSTF requests that the Traveler be made available under the Consolidated Line Item Improvement Process.

11921 Rockville Pike, Suite 100, Rockville, MD 20852 Phone: 301-984-4400, Fax: 301-984-7600 Email: tstf@excelservices.com Administered by EXCEL Services Corporation

TSTF 07-27 October 10, 2007 Page 2 Should you have any questions, please do not hesitate to contact us.

Bert Yates (PWROG/W) John Messina (BWROG)

David Bice (PWROG/CE) Reene' Gambrell (PWROG/B&W)

Enclosure Attachment cc: Tim Kobetz, Technical Specifications Branch, NRC Ross Telson, Technical Specifications Branch, NRC Matthew Hamm, Technical Specifications Branch, NRC

Response to NRC Request for Additional Information Regarding TSTF-498, Revision 0, "Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)," dated June 13, 2007 The following is the Technical Specification Task Force (TSTF) response to NRCs June 13, 2007, letter requesting the information to complete the review of TSTF-498.

1. Question:

Since TSTF-498 is not in compliance with topical report BAW-2461, either TSTF-498 should be revised to incorporate the conditions/limitations of topical report BAW-2461 and the staff SE, or topical report BAW-2461 should be revised to include the proposed change and resubmitted for staff review. Provide justification showing that the topical report results remain acceptable without the specified TS conditions and required actions applied to CIVs associated with a closed system and that the increase in risk continues to be very small.

Response

The TSTF determined that incorporating the conditions and limitations in BAW-2461 related to the change to the Completion Time for penetrations with a single CIV and a closed system would require a substantial revision to Specification 3.6.3, "Containment Isolation Valves,"

and would require changes and justification beyond the scope of BAW-2461. Therefore, the attached Revision 1 of TSTF-498 eliminates the change to the Completion Time for an inoperable containment isolation valve (CIV) in a penetration with a single CIV and a closed system.

2. Question:

TSTF-498 does not address TS LCO 3.6.3 Note 2 that allows separate condition entry for each penetration flow path. Based on the BAW-2461 staff SE, and previous discussions with the Pressurized Reactor Owners Group (PWROG), TSTF-498 should be revised to address an inoperable CIV in multiple penetration flow paths such that the proposed 7-day CIV completion time (CT) LCO will be limited to no more than one CIV in at any given time.

Response

The attached Revision 1 to TSTF-498 adds a Condition for "Two or more penetration flow paths with one containment isolation valve inoperable [for reasons other than Condition[s] E

[and F))," with a Required Action, "Isolate all but one penetration flow path by use of at least one closed and de-activated automatic valve, closed manual valve, or blind flange." This action has a 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time. This retains the existing Technical Specification actions and Completion Times when multiple penetration flow paths are inoperable and limits the 7 day Completion Time to no more than one CIV at any given time.

BWOG-114, Rev. 0 TSTF-498, Rev. 1 Technical Specification Task Force Improved Standard Technical Specifications Change Traveler Risk-Informed Containment Isolation Valve Completion Times (BAW-2461)

NUREGs Affected: 1430 1431 1432 1433 1434 Classification: 1) Technical Change Recommended for CLIIP?: Yes Correction or Improvement: Improvement NRC Fee Status: Not Exempt Benefit: Provides Longer Completion Time Industry

Contact:

Reene' Gambrell, (864) 885-3364, RVGambrell@duke-energy.com 1.0 Description The proposed change extends the Completion Times for containment penetration flow paths with one containment isolation valve inoperable from 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months to 7 days for Babcock & Wilcox (B&W) NSSS plants.

This change is applicable to containment penetrations with two [or more] containment isolation valves in which one containment isolation valve is inoperable [for reasons other than purge valve leakage not within limit]. The extended Completion Time is not applicable to containment isolation valves in the main steam lines or those identified by plant-specific analysis as having high risk significance for interfacing systems loss of coolant accidents (ISLOCAs) and the existing 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time applies.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1 2.0 Proposed Change The proposed change applies to B&W plants and allows 7 days, versus 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , to restore an inoperable containment isolation valve (or isolate the affected penetration) based on the evaluations in BAW-2463-A, "Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change." The specific changes are described below.

For the Condition of one or more penetration flow paths with one containment isolation valve inoperable in a penetration flow path with two [or more] containment isolation valves, the Completion Time for isolating the affected penetration is revised from 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months to 7 days. This condition is modified by a Note which states that it is not applicable to containment isolation valves in the main steam lines or (as described in a Reviewer's Note) those identified by plant-specific analysis as having high risk significance for ISLOCAs. A new Required Action is added (Required Action A.1) which requires verification that the Operable containment isolation valve in the penetration is not inoperable due to common cause failure. Additional details on evaluating possible common cause failure is given in the Bases.

A new Condition, Condition B, is added which is identical to the existing Condition A. It contains a 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time to isolate the affected flow path and is only applicable to the containment isolation valves excluded from Condition A (e.g., containment isolation valves in the main steam lines or (as described in a Reviewer's Note) those identified by plant-specific analysis as having high risk significance for ISLOCAs.)

A new Condition, Condition C, is added which is applicable when two or more penetrations have one inoperable containment isolation valve. This Condition requires isolating all but one of the affected penetrations with 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months (the existing Completion Time for Condition A). This condition limits the 7 day Completion Time in Condition A to a single penetration.

Existing Condition C, now renamed Condition E due to the addition of Conditions B and C, which applies to one or more penetrations with one containment isolation valve inoperable and is only applicable to penetration flow paths with only one containment isolation valve and a closed system. While BAW-2461 justifies a 7 day Completion Time for this Condition, it is not included in this Traveler. The BAW-2461 justification relies on Technical Specification controls that cannot be incorporated into the ISTS without a significant revision to the Specification.

Existing Conditions B thorough E are renumbered to reflect the addition of new Conditions B and C.

The Bases are revised to reflect the changes to the Specifications.

10-Oct-07 Traveler Rev. 3. Copyright (C) 2006, EXCEL Services Corporation. Use by EXCEL Services associates, utility clients, and the U.S. Nuclear Regulatory Commission is granted. All other use without written permission is prohibited.

BWOG-114, Rev. 0 TSTF-498, Rev. 1

3.0 Background

The Pressurized Water Reactor Owners Group (PWROG) Topical Report BAW-2461 provides a risk-informed technical basis for specific changes to Technical Specification Completion Times of NUREG-1430 Specification 3.6.3, "Containment Isolation Valves," which is applicable to B&W plants. The primary intent of the proposed change is to provide for the potential of on-line maintenance, repair, and testing of a containment isolation valve that is declared inoperable during operation in the applicable Modes. These changes are warranted based on the low risk associated with the extended Completion Times.

This application is being pursued by the PWROG as a risk-informed plant modification for B&W plants in accordance with NRC Regulatory Guides 1.174 and 1.177. BAW-2461 provides generic risk assessments of the adoption of these Technical Specification changes.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1 4.0 Technical Analysis BAW-2461 documented the analysis used for evaluating plant risk associated with the proposed changes to the containment isolation valve Technical Specification Completion Times. The process involves grouping the various containment penetrations into groups and performing evaluations for each of the groups of containment penetrations to assess the impact on plant risk due to the proposed Completion Time extensions for the associated containment isolation valves. The evaluation of the impact on plant risk determines the change in core damage frequency ( CDF), the ICCDP, the change in large early release frequency (

LERF), and the ICLERP.

The results of the evaluations in BAW-2461 demonstrate that the proposed Completion Time extensions provide plant operational flexibility while simultaneously allowing plant operation with an acceptable level of risk. The results demonstrate that the risk level associated with the proposed Completion Time is below the guidelines set forth in Regulatory Guides 1.174 and 1.177.

The following comments apply to BAW-2461, Table 2-1, "Summary of Proposed Technical Specifications Change." As noted in the footnote to Table 2-1, the Table is for illustration only and the TSTF Traveler will provide the specific wording, as discussed below.

1. BAW-2461, Table 2-1, Condition A note states "Only applicable to penetration flow paths with two [or more] containment isolation valves with the exception of containment isolation valves in the main steam lines [and list of specific penetrations (if any) identified by the plant-specific risk-informed process to have high risk significance for ISLOCA.]" To be consistent with the ITS format and content rules, the Condition A Note was written as "Only applicable to penetration flow paths with two [or more]

containment isolation valves except containment isolation valves in the main steam lines and [ ]." The Condition is modified by a Reviewer's Note which states, "The Condition A Note should list the specific penetrations (if any) identified by the plant-specific risk analysis as having high risk significance for an inter-system loss of coolant accident (ISLOCA)." This change is editorial and does not affect the application of the TS.

2. The July 5, 2006 RAI response to NRC Question 1 stated that the following action would be added as Required Action A.1 with a 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time, "Verify that the redundant CIV on the same penetration is operable [applicable only if the redundant CIV has an operator and/or body type that is not diverse from the inoperable CIV depending on which parts are inoperable]." In the Traveler, Required Action A.1 has a 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time and states, "Determine the OPERABLE containment isolation valve in the affected penetration is not inoperable due to common cause failure." The wording was chosen to be consistent with LCO 3.8.1, Required Action B.3.1, regarding inoperable diesel generators. The discussion of what is required to be evaluated, "applicable only if the redundant CIV has an operator and/or body type that is not diverse from the inoperable CIV depending on which parts are inoperable," is placed in the Required Action A.1 Bases. This is consistent with the ITS format and content rules and is considered editorial as the intent of the Required Action has not been changed.

3. BAW-2461 added a new Condition which contained the same Note as Condition A. The new Condition (Condition B) was revised similar to the changes to Condition A discussed in Item 1, above (i.e., revising the Note and including a Reviewer's Note).

4. A new Condition, Condition C, is added which is applicable when two or more penetrations have one inoperable containment isolation valve. This Condition requires isolating all but one of the affected penetrations with 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months (the existing Completion Time for Condition A). This condition limits the 7 day Completion Time in Condition A to a single penetration and is consistent with Condition and Limitation 6 in the NRC's Safety Evaluation for BAW-2461.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1

5. BAW-2461 justified a 7 day Completion Time for an inoperable containment isolation valve in a penetration with one containment isolaiton valve and a closed system. This change is not included in this Traveler. The BAW-2461 justification relies on Technical Specification controls that cannot be incorporated into the ISTS without a significant revision to the Specification.

10-Oct-07 Traveler Rev. 3. Copyright (C) 2006, EXCEL Services Corporation. Use by EXCEL Services associates, utility clients, and the U.S. Nuclear Regulatory Commission is granted. All other use without written permission is prohibited.

BWOG-114, Rev. 0 TSTF-498, Rev. 1 5.0 Regulatory Analysis 5.1 No Significant Hazards Consideration The TSTF has evaluated whether or not a significant hazards consideration is involved with the proposed generic changes by focusing on the three standards set forth in 10 CFR 50.92, "Issuance of amendment," as discussed below:

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

Response: No.

The proposed changes revise the Completion Times for restoring an inoperable containment isolation valve (or isolating the affected penetration) within the scope of Topical Report BAW-2461-A, "Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change." The Completion Times are extended from 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months to 7 days. Containment isolation valves are not accident initiators in any accident previously evaluated. Consequently, the probability of an accident previously evaluated is not significantly increased. Containment isolation valves control the extent of leakage from the containment following an accident. As such, containment isolation valves are instrumental in controlling the consequences of an accident. However, the consequences of any accident previously evaluated are no different during the proposed extended Completion Times than during the existing Completion Times. As a result, the consequences of any accident previously evaluated are not significantly increased. Therefore, the proposed changes do not involve a significant increase in the probability or consequences of an accident previously evaluated.

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

Response: No.

The proposed changes revise the Completion Times for restoring an inoperable containment isolation valve (or isolating the affected penetration) within the scope of Topical Report BAW-2461-A, "Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change. The proposed changes do not change the design, configuration, or method of operation of the plant. The proposed changes do not involve a physical alteration of the plant (no new or different kind of equipment will be installed). Therefore, the proposed changes do not create the possibility of a new or different kind of accident from any accident previously evaluated.

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

Response: No.

The proposed changes revise the Completion Times for restoring an inoperable containment isolation valve (or isolating the affected penetration) within the scope of Topical Report BAW-2461-A, "Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change. In order to evaluate the proposed Completion Time extensions, a probabilistic risk evaluation was performed as documented in Topical Report BAW-2461-A. The risk evaluation concluded that the proposed increase in the Completion Times does not result in an unacceptable incremental conditional core damage probability or incremental conditional large early release probability according to the guidelines of Regulatory Guide 1.177. Therefore, the proposed changes do not involve a significant reduction in a margin of safety.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1 Based on the above, the TSTF concludes that the proposed changes present no 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.

5.2 Applicable Regulatory Requirements/Criteria Appendix A of 10 CFR Part 50 - General Design Criterion (GDC) 55, "Reactor Coolant Pressure Boundary Penetrating Containment," requires that each line that is part of the reactor coolant pressure boundary and that penetrates the containment shall be provided with containment isolation valves.

Appendix A of 10 CFR 50 - GDC 56, "Primary Containment Isolation," requires that each line that connects directly to the containment atmosphere and penetrates the reactor containment shall be provided with containment isolation valves.

The Maintenance Rule, 10 CFR 50.65(a)(4), as it relates to the proposed changes, requires the assessment and management of the increase in risk that may result from a proposed maintenance activity.

The design of the applicable plants is not changed and single failure protection is still a design requirement. However, the proposed changes extend the limited time during which single failure protection for isolation of a containment penetration is relaxed.

The proposed change does not affect plant compliance with these regulations.

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 approval of the proposed change will not be inimical to the common defense and security or to the health and safety of the public.

6.0 Environmental Consideration A review has determined that the proposed changes would change requirements 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 changes do 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 changes meet 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 changes.

7.0 References

1. BAW-2641-A, "Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change."

2. Letter from Ho K. Nieh (NRC) to Gordon Bischoff (PWROG), "Final Safety Evaluation For Pressurized Water Reactor Owners Group (PWROG) Topical Report BAW-2461, Revision 0, 'Risk-Informed Justification For Containment Isolation Valve Allowed Outage Time Change'," dated August 29, 2007.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1 Revision History OG Revision 0 Revision Status: Closed Revision Proposed by: Areva Revision

Description:

Original Issue Owners Group Review Information Date Originated by OG: 26-Sep-06 Owners Group Comments (No Comments)

Owners Group Resolution: Approved Date: 08-Oct-06 TSTF Review Information TSTF Received Date: 31-Oct-06 Date Distributed for Review 31-Oct-06 OG Review Completed: BWOG WOG CEOG BWROG TSTF Comments:

(No Comments)

TSTF Resolution: Approved Date: 18-Nov-06 NRC Review Information NRC Received Date: 22-Dec-06 NRC Comments: Date of NRC Letter: 13-Jun-07 BAW-2461 was approved on 8/29/07.

NRC provided RAI on 6/13/07.

Final Resolution: Superceded by Revision TSTF Revision 1 Revision Status: Active Revision Proposed by: NRC Revision

Description:

TSTF-498 is revised to address differences between Revision 0 and the approved BAW-2461 Topical Report.

1) A new Condition is added (Condition C) with retains the existing 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time for multiple penetrations with one inoperable CIV. All but one penetration must be isolated within the existing 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time.

2) The Revision 0 Completion Time extension from 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months to 7 days for Condition C (penetrations with one CIV and a closed system) is removed. The justification in BAW-2461 relied on Technical Specification constraints which cannot be incorporated in to the ISTS without a rewrite of the entire specification.

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BWOG-114, Rev. 0 TSTF-498, Rev. 1 TSTF Revision 1 Revision Status: Active Owners Group Review Information Date Originated by OG: 24-Sep-07 Owners Group Comments (No Comments)

Owners Group Resolution: Approved Date: 09-Oct-07 TSTF Review Information TSTF Received Date: 24-Sep-07 Date Distributed for Review 24-Sep-07 OG Review Completed: BWOG WOG CEOG BWROG TSTF Comments:

(No Comments)

TSTF Resolution: Approved Date: 09-Oct-07 NRC Review Information NRC Received Date: 10-Oct-07 Affected Technical Specifications Ref. 3.6.3 Containment Isolation Valves Action 3.6.3.A Containment Isolation Valves Action 3.6.3.A Bases Containment Isolation Valves Action 3.6.3.B Containment Isolation Valves Change

Description:

Renamed Condition D Action 3.6.3.B Containment Isolation Valves Change

Description:

New Condition Action 3.6.3.B Bases Containment Isolation Valves Change

Description:

Renamed Condition D Action 3.6.3.B Bases Containment Isolation Valves Change

Description:

New Condition Action 3.6.3.C Containment Isolation Valves Change

Description:

Renamed Condition E 10-Oct-07 Traveler Rev. 3. Copyright (C) 2006, EXCEL Services Corporation. Use by EXCEL Services associates, utility clients, and the U.S. Nuclear Regulatory Commission is granted. All other use without written permission is prohibited.

BWOG-114, Rev. 0 TSTF-498, Rev. 1 Action 3.6.3.C Bases Containment Isolation Valves Change

Description:

Renamed Condition E Action 3.6.3.D Containment Isolation Valves Change

Description:

Renamed Condition F Action 3.6.3.D Bases Containment Isolation Valves Change

Description:

Renamed Condition F Action 3.6.3.E Containment Isolation Valves Change

Description:

Renamed Condition G Action 3.6.3.E Bases Containment Isolation Valves Change

Description:

Renamed Condition G SR 3.6.3.1 Bases Containment Isolation Valves SR 3.6.3.6 Bases Containment Isolation Valves 10-Oct-07 Traveler Rev. 3. Copyright (C) 2006, EXCEL Services Corporation. Use by EXCEL Services associates, utility clients, and the U.S. Nuclear Regulatory Commission is granted. All other use without written permission is prohibited.

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 3.6 CONTAINMENT SYSTEMS 3.6.3 Containment Isolation Valves LCO 3.6.3 Each containment isolation valve shall be OPERABLE.

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

ACTIONS

NOTES----------------------------------------------------------

1. Penetration flow paths [except for 48 inch purge valve penetration flow paths] may be unisolated intermittently under administrative controls.

2. Separate Condition entry is allowed for each penetration flow path.

3. Enter applicable Conditions and Required Actions for system(s) made inoperable by containment isolation valves.

4. Enter applicable Conditions and Required Actions of LCO 3.6.1, "Containment," when isolation valve leakage results in exceeding the overall containment leakage rate acceptance criteria.

BWOG STS 3.6.3-1 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 CONDITION REQUIRED ACTION COMPLETION TIME

REVIEWER'S NOTE----- A.1 Determine the OPERABLE 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months The Condition A Note containment isolation valve should list the specific in the affected penetration penetrations (if any) is not inoperable due to identified by the plant- common cause failure.

specific risk analysis as having high risk AND significance for an interfacing systems loss A.21 Isolate the affected 7 days of coolant accident penetration flow path by 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months (ISLOCA). use of at least one closed

and de-activated automatic valve, closed manual valve, A. ------------NOTE------------ blind flange, or check valve Only applicable to with flow through the valve penetration flow paths secured.

with two [or more]

containment isolation AND valves except containment isolation A.32 -------------NOTES--------------

valves in the main steam 1. Isolation devices in high lines and [ ]. radiation areas may be

verified by use of administrative means.

One or more penetration flow paths with one 2. Isolation devices that containment isolation are locked, sealed, or valve inoperable [for otherwise secured may reasons other than be verified by use of purge valve leakage not administrative means.

within limit]. -------------------------------------

Verify the affected Once per 31 days for penetration flow path is isolation devices isolated. outside containment AND Prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days for isolation devices inside containment BWOG STS 3.6.3-2 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME

REVIEWER'S NOTE----- B.1 Isolate the affected 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months The Condition B Note penetration flow path by should list the specific use of at least one closed penetrations (if any) and de-activated automatic identified by the plant- valve, closed manual valve, specific risk analysis as blind flange, or check valve having high risk with flow through the valve significance for an secured.

interfacing systems loss of coolant accident AND (ISLOCA).

B.2 -------------NOTES--------------

1. Isolation devices in high B. ------------NOTE------------ radiation areas may be Only applicable to verified by use of penetration flow paths administrative means.

with two [or more]

containment isolation 2. Isolation devices that valves in the main steam are locked, sealed, or lines and [ ]. otherwise secured may

be verified by use of administrative means.

One or more penetration -------------------------------------

flow paths with one containment isolation Verify the affected Once per 31 days for valve inoperable [for penetration flow path is isolation devices reasons other than isolated. outside containment purge valve leakage not within limit]. AND Prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days for isolation devices inside containment BWOG STS 3.6.3-3 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. ------------NOTE------------ C.1 Isolate all but one of the 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Only applicable to affected penetration flow penetration flow paths paths by use of at least one with two [or more] closed and de-activated containment isolation automatic valve, closed valves. manual valve, or blind

flange.

Two or more penetration flow paths with one containment isolation valve inoperable [for reasons other than Condition[s] E [and F)).

DB. ------------NOTE------------ DB.1 Isolate the affected 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months Only applicable to penetration flow path by penetration flow paths use of at least one closed with two [or more] and de-activated automatic containment isolation valve, closed manual valve, valves. or blind flange.

One or more penetration flow paths with two [or more] containment isolation valves inoperable [for reasons other than purge valve leakage not within limit].

EC. ------------NOTE------------ EC.1 Isolate the affected 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months Only applicable to penetration flow path by penetration flow paths use of at least one closed with only one and de-activated automatic containment isolation valve, closed manual valve, valve and a closed or blind flange.

system.

AND One or more penetration flow paths with one containment isolation valve inoperable.

BWOG STS 3.6.3-4 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME EC.2 -------------NOTES--------------

1. Isolation devices in high radiation areas may be verified by use of administrative means.

2. Isolation devices that are locked, sealed, or otherwise secured may be verified by use of administrative means.

Verify the affected Once per 31 days penetration flow path is isolated.

FD. [ One or more FD.1 Isolate the affected 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months penetration flow paths penetration flow path by with one or more use of at least one [closed containment purge and de-activated automatic valves not within purge valve, closed manual valve, valve leakage limits. or blind flange].

AND BWOG STS 3.6.3-5 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves 3.6.3 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME FD.2 -------------NOTES--------------

1. Isolation devices in high radiation areas may be verified by use of administrative means.

2. Isolation devices that are locked, sealed, or otherwise secured may be verified by use of administrative means.

Verify the affected Once per 31 days for penetration flow path is isolation devices isolated. outside containment AND Prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days for isolation devices inside containment AND FD.3 Perform SR 3.6.3.6 for the Once per [ ] days ]

resilient seal purge valves closed to comply with Required Action DE.1.

GE. Required Action and GE.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. AND GE.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months BWOG STS 3.6.3-6 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES ACTIONS (continued)

A second Note has been added to provide clarification that, for this LCO, separate Condition entry is allowed for each penetration flow path. This is acceptable , since the Required Actions for each Condition provide appropriate compensatory actions for each inoperable containment isolation valve. Complying with the Required Actions may allow for continued operation, and subsequent inoperable containment isolation valves are governed by subsequent Condition entry and application of associated Required Actions.

The ACTIONS are further modified by a third Note, which ensures appropriate remedial actions are taken, if necessary, if the affected systems are rendered inoperable by an inoperable containment isolation valve.

In the event isolation valve leakage results in exceeding the overall containment leakage rate, Note 4 directs entry into the applicable Conditions and Required Actions of LCO 3.6.1.

A.1, A.2, and A.32 Condition A has been modified by a Note indicating this Condition is only applicable to those penetration flow paths with two [or more] containment isolation valves. The Note also states that the Condition is not applicable to containment isolation valves in the main steam lines and [any specific penetrations identified by the plant-specific risk analysis as having high risk significance for an interfacing systems loss of coolant accident (ISLOCA), as described in Reference 6]. For penetration flow paths with only one containment isolation valve and a closed system, Condition E provides appropriate actions.

In the event one containment isolation valve in one or more penetration flow paths is inoperable, [except for purge valve leakage not within limit,],

the affected penetration flow path must be isolated. The method of isolation must include the use of at least one isolation barrier that cannot be adversely affected by a single active failure. Isolation barriers that meet this criterion are a closed and de-activated automatic containment isolation valve, a closed manual valve, a blind flange, and a check valve with flow through the valve secured. For a penetration isolated in accordance with Required Action A.21, the device used to isolate the penetration should be the closest available one to containment. Required Action A.1 2 must be completed within the 7 day 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time.

The specified time period is based on an analysis of plant risk (Ref.

6).reasonable, considering the time required to isolate the penetration and the relative importance of supporting containment OPERABILITY during MODES 1, 2, 3, and 4. Required Action A.1 requires a BWOG STS B 3.6.3-5 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 determination that the OPERABLE containment isolation valve in the affected penetration is not inoperable due to a common cause failure. If the inoperable containment isolation valve and the OPERABLE containment isolation valve in the penetration share a similar design in a feature that is related to the valve inoperability, a situation-specific verification of the OPERABLE containment isolation valve (e.g.,

inspection, partial stroke, functionality test, or engineering evaluation) must be performed with 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

For affected penetration flow paths that cannot be restored to OPERABLE status within the 7 day 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time and that have been isolated in accordance with Required Action A.21, the affected penetration flow paths must be verified to be isolated on a periodic basis.

This periodic verification is necessary to ensure that containment penetrations required to be isolated following an accident and no longer capable of BWOG STS B 3.6.3-6 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES ACTIONS (continued) being automatically isolated will be in the isolation position should an event occur. This Required Action does not require any testing or device manipulation. Rather, it involves verification that those isolation devices outside containment and capable of being mispositioned are in the correct position. The Completion Time of "once per 31 days for isolation devices outside containment" is appropriate considering the fact that the devices are operated under administrative controls and the probability of their misalignment is low. For the isolation devices inside containment, the time period specified as "prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days" is based on engineering judgment and is considered reasonable in view of the inaccessibility of the isolation devices and other administrative controls that will ensure that isolation device misalignment is an unlikely possibility.

Condition A has been modified by a Note indicating this Condition is only applicable to those penetration flow paths with two [or more] containment isolation valves. For penetration flow paths with only one containment isolation valve and a closed system, Condition C provides appropriate actions.

Required Action A.2 3 is modified by two Notes. Note 1 applies to isolation devices located in high radiation areas and allows the devices to be verified by use of administrative means. Allowing verification by administrative means is considered acceptable since access to these areas is typically restricted. Note 2 applies to isolation devices that are locked, sealed, or otherwise secured in position and allows these devices to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since the function of locking, sealing, or securing components is to ensure that these devices are not inadvertently repositioned. Therefore, the probability of misalignment of these devices, once they have been verified to be in the proper position, is small.

B.1 and B.2 Condition B has been modified by a Note indicating this Condition is only applicable to those penetration flow paths with two [or more] containment isolation valves that are containment isolation valves in the main steam lines or are [any specific penetrations identified by the plant-specific risk analysis as having high risk significance for an interfacing systems loss of coolant accident (ISLOCA), as described in Reference 6].

In the event one containment isolation valve in one or more penetration flow paths is inoperable, [except for purge valve leakage not within limit,]

the affected penetration flow path must be isolated. The method of BWOG STS B 3.6.3-7 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 isolation must include the use of at least one isolation barrier that cannot be adversely affected by a single active failure. Isolation barriers that meet this criterion are a closed and de-activated automatic containment isolation valve, a closed manual valve, a blind flange, and a check valve with flow through the valve secured. For a penetration isolated in accordance with Required Action B.1, the device used to isolate the penetration should be the closest available one to containment. Required Action B.1 must be completed within the 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time. The specified time period is reasonable, considering the time required to isolate the penetration and the relative importance of supporting containment OPERABILITY during MODES 1, 2, 3, and 4.

For affected penetration flow paths that cannot be restored to OPERABLE status within the 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time and that have been isolated in accordance with Required Action B.1, the affected penetration flow paths must be verified to be isolated on a periodic basis. This periodic verification is necessary to ensure that containment penetrations required to be isolated following an accident and no longer capable of being automatically isolated will be in the isolation position should an event occur. This Required Action does not require any testing or device manipulation. Rather, it involves verification that those isolation devices outside containment and capable of being mispositioned are in the correct position. The Completion Time of "once per 31 days for isolation devices outside containment" is appropriate considering the fact that the devices are operated under administrative controls and the probability of their misalignment is low. For the isolation devices inside containment, the time period specified as "prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days" is based on engineering judgment and is considered reasonable in view of the inaccessibility of the isolation devices and other administrative controls that will ensure that isolation device misalignment is an unlikely possibility.

Required Action B.2 is modified by two Notes. Note 1 applies to isolation devices located in high radiation areas and allows the devices to be verified by use of administrative means. Allowing verification by administrative means is considered acceptable since access to these areas is typically restricted. Note 2 applies to isolation devices that are locked, sealed, or otherwise secured in position and allows these devices to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since the function of locking, sealing, or securing components is to ensure that these devices are not inadvertently repositioned. Therefore, the probability of misalignment of these devices, once they have been verified to be in the proper position, is small.

C.1 BWOG STS B 3.6.3-8 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 In the event one containment isolation valve in two or more penetration flow paths are inoperable, all but one of the affected containment isolation valves must be isolated within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months . The 7 day Completion Time in Condition A is only applicable to a single inoperable containment isolation valve in one penetration. Therefore, all but one penetration must be isolated using a closed and de-activated automatic valve, a closed manual valve, or a blind flange within the 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months Completion Time.

When the affected penetration is isolated in accordance with Required Action C.1, the affected penetration must be verified to be isolated on a periodic basis per Required Action A.3 or B.2, which remain in effect.

This periodic verification is necessary to assure leak tightness of containment and that penetrations requiring isolation following an accident are isolated. The Completion Time of once per 31 days for verifying each affected penetration flow path is isolated is appropriate considering the fact that the valves are operated under administrative controls and the probability of their misalignment is low.

Condition C is modified by a Note indicating this Condition is only applicable to penetration flow paths with two [or more] containment isolation valves. Conditions A, B, and C of this LCO address the condition of one containment isolation valve inoperable in this type of penetration flow path.

DB.1 With two [or more] containment isolation valves in one or more penetration flow paths inoperable, [except for purge valve leakage not within limit,], the affected penetration flow path must be isolated within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . The method of isolation must include the use of at least one isolation barrier that cannot be adversely affected by a single active BWOG STS B 3.6.3-9 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES ACTIONS (continued) failure. Isolation barriers that meet this criterion are a closed and de-activated automatic valve, a closed manual valve, and a blind flange. The 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months Completion Time is consistent with the ACTIONS of LCO 3.6.1. In the event the affected penetration is isolated in accordance with Required Action DB.1, the affected penetration must be verified to be isolated on a periodic basis per Required Action A.32 or B.2, which remains in effect.

This periodic verification is necessary to assure leak tightness of containment and that penetrations requiring isolation following an accident are isolated. The Completion Time of once per 31 days for verifying each affected penetration flow path is isolated is appropriate considering the fact that the valves are operated under administrative controls and the probability of their misalignment is low.

Condition DB is modified by a Note indicating this Condition is only applicable to penetration flow paths with two [or more] containment isolation valves. Conditions A, B, and C of this LCO addresses the condition of one containment isolation valve inoperable in this type of penetration flow path.

EC.1 and EC.2 With one or more penetration flow paths with one containment isolation valve inoperable, the inoperable valve must be restored to OPERABLE status or the affected penetration flow path must be isolated. The method of isolation must include the use of at least one isolation barrier that cannot be adversely affected by a single active failure. Isolation barriers that meet this criterion are a closed and de-activated automatic valve, a closed manual valve, and a blind flange. A check valve may not be used to isolate the affected penetration. Required Action EC.1 must be completed within the 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months Completion Time. The specified time period is reasonable, considering the relative stability of the closed system (hence, reliability) to act as a penetration isolation boundary and the relative importance of supporting containment OPERABILITY during MODES 1, 2, 3, and 4. In the event the affected penetration is isolated in accordance with Required Action CE.1, the affected penetration flow path must be verified to be isolated on a periodic basis. This periodic verification is necessary to assure leak tightness of containment and that containment penetrations requiring isolation following an accident are isolated. The Completion Time of once per 31 days for verifying that each affected penetration flow path is isolated is appropriate considering the fact that the valves are operated under administrative controls and the probability of their misalignment is low.

BWOG STS B 3.6.3-10 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES ACTIONS (continued)

Condition C E is modified by a Note indicating that this Condition is only applicable to those penetration flow paths with only one containment isolation valve and a closed system. The closed system must meet the requirements of Reference 67. This Note is necessary since this Condition is written to specifically address those penetration flow paths in a closed system.

Required Action CE.2 is modified by two Notes. Note 1 applies to valves and blind flanges located in high radiation areas and allows these devices to be verified by use of administrative means. Allowing verification by administrative means is considered acceptable since access to these areas is typically restricted. Note 2 applies to isolation devices that are locked, sealed, or otherwise secured in position and allows these devices to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since the function of locking, sealing, or securing components is to ensure that these devices are not inadvertently repositioned. Therefore, the probability of misalignment of these devices, once verified to be in the proper position, is small.

[ FD.1, FD.2, and FD.3 In the event one or more containment purge valves in one or more penetration flow paths are not within the purge valve leakage limits, purge valve leakage must be restored to within limits or the affected penetration flow path must be isolated. The method of isolation must be by the use of at least one isolation barrier that cannot be adversely affected by a single active failure. Isolation barriers that meet this criterion are a [closed and de-activated automatic valve, closed manual valve, and blind flange]. A purge valve with resilient seals utilized to satisfy Required Action FD.1 must have been demonstrated to meet the leakage requirements of SR 3.6.3.6. The specified Completion Time is reasonable, considering that one containment purge valve remains closed so that a gross breach of containment does not exist.

In accordance with Required Action FD.2, this penetration flow path must be verified to be isolated on a periodic basis. The periodic verification is necessary to ensure that containment penetrations required to be isolated following an accident, which are no longer capable of being automatically isolated, will be in the isolation position should an event occur. This BWOG STS B 3.6.3-11 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES ACTIONS (continued)

Required Action does not require any testing or valve manipulation.

Rather, it involves verification that those isolation devices outside containment and potentially capable of being mispositioned are in the correct position. For the isolation devices inside containment, the time period specified as "prior to entering MODE 4 from MODE 5 if not performed within the previous 92 days" is based on engineering judgment and is considered reasonable in view of the inaccessibility of the isolation devices and other administrative controls that will ensure that isolation device misalignment is an unlikely possibility.

For the containment purge valve with resilient seal that is isolated in accordance with Required Action FD.1, SR 3.6.3.6 must be performed at least once every [ ] days. This provides assurance that degradation of the resilient seal is detected and confirms that the leakage rate of the containment purge valve does not increase during the time the penetration is isolated. The normal Frequency for SR 3.6.3.6, 184 days, is based on an NRC initiative, Generic Issue B-20 (Ref. 89). Since more reliance is placed on a single valve while in this Condition, it is prudent to perform the SR more often. Therefore, a Frequency of once per [ ] days was chosen and has been shown acceptable based on operating experience.

Required Action FD.2 is modified by two Notes. Note 1 applies to isolation devices located in high radiation areas and allows these devices to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since access to these areas is typically restricted. Note 2 applies to isolation devices that are locked, sealed, or otherwise secured in position and allows these devices to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since the function of locking, sealing, or securing components is to ensure that these devices are not inadvertently repositioned. ]

GE.1 and GE.2 If the Required Actions and associated Completion Times are not met, the plant must be brought to a MODE in which the LCO does not apply.

To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to 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.

BWOG STS B 3.6.3-12 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES SURVEILLANCE [ SR 3.6.3.1 REQUIREMENTS Each [48] inch containment purge valve is required to be verified sealed closed at 31 day intervals. This Surveillance is designed to ensure that a gross breach of containment is not caused by an inadvertent or spurious opening of a containment purge valve. Detailed analysis of the purge valves failed to conclusively demonstrate their ability to close during a LOCA in time to limit offsite doses. Therefore, these valves are required to be in the sealed closed position during MODES 1, 2, 3, and 4. A containment purge valve that is sealed closed must have motive power to the valve operator removed. This can be accomplished by de-energizing the source of electric power or by removing the air supply to the valve operator. In this application, the term "sealed" has no connotation of leak tightness. The Frequency is a result of an NRC initiative, Generic Issue B-24 (Ref. 78), related to containment purge valve use during unit operations. In the event purge valve leakage requires entry into Condition ED, the Surveillance permits opening one purge valve in a penetration flow path to perform repairs. ]

SR 3.6.3.2 This SR ensures that the minipurge valves are closed as required or, if open, open for an allowable reason. If a purge valve is open in violation of this SR, the valve is considered inoperable. If the inoperable valve is not otherwise known to have excessive leakage when closed, it is not considered to have leakage outside of limits. The SR is not required to be met when the minipurge valves are open for pressure control, ALARA or air quality considerations for personnel entry, or for Surveillances that require the valves to be open. The minipurge valves are capable of closing in the environment following a LOCA. Therefore, these valves are allowed to be open for limited periods of time. The 31 day Frequency is consistent with other containment isolation valve requirements discussed in SR 3.6.3.3.

SR 3.6.3.3 This SR requires verification that each containment isolation manual valve and blind flange located outside containment and not locked, sealed, or otherwise secured and required to be closed during accident conditions is closed. The SR helps to ensure that post accident leakage of radioactive fluids or gases outside the containment boundary is within BWOG STS B 3.6.3-13 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES SURVEILLANCE REQUIREMENTS (continued)

The Note allows valves and blind flanges located in high radiation areas to be verified closed by use of administrative means. Allowing verification by administrative means is considered acceptable, since the access to these areas is typically restricted during MODES 1, 2, 3, and 4 for ALARA reasons. Therefore, the probability of misalignment of these containment isolation valves, once they have been verified to be in their proper position, is small.

SR 3.6.3.5 Verifying that the isolation time of each automatic power operated containment isolation valve is within limits is required to demonstrate OPERABILITY. The isolation time test ensures the valve will isolate in a time period less than or equal to that assumed in the safety analyses.

[The isolation time and Frequency of this SR are in accordance with the Inservice Testing Program or 92 days.]

SR 3.6.3.6 For containment purge valves with resilient seals, additional leakage rate testing beyond the test requirements of 10 CFR 50, Appendix J, Option

[A][B] is required to ensure OPERABILITY. Operating experience has demonstrated that this type of seal has the potential to degrade in a shorter time period than do other seal types. Based on this observation and the importance of maintaining this penetration leak tight (due to the direct path between containment and the environment), a Frequency of once per 184 days was established as part of the NRC resolution of Generic Issue B-20, "Containment Leakage Due to Seal Deterioration" (Ref. 89).

Additionally, this SR must be performed within 92 days after opening the valve. The 92 day Frequency was chosen recognizing that cycling the valve could introduce additional seal degradation (greater than that occurring to a valve that has not been opened). Thus, decreasing the interval (from 184 days) is a prudent measure after a valve has been opened.

BWOG STS B 3.6.3-15 Rev. 3.0, 03/31/04

TSTF-498, Rev. 1 Containment Isolation Valves B 3.6.3 BASES REFERENCES 1. 10 CFR 20.

2. FSAR, Section [5.6].

3. FSAR, Sections [14.1 and 14.2].

4. FSAR, Section [5.3].

5. FSAR, Section [5.3].

6. BAW-2461-A, Risk-Informed Justification for Containment Isolation Valve Allowed Outage Time Change.

76. Standard Review Plan 6.2.4.

87. Generic Issue B-24.

98. Generic Issue B-20.

BWOG STS B 3.6.3-17 Rev. 3.0, 03/31/04

TSTF-07-27, Response to NRC Request for Additional Information Regarding TSTF-498, Revision 0, Risk-Informed Containment Isolation Valve Completion Times (BAW-2461), Dated June 13, 2007

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TSTF-07-27, Response to NRC Request for Additional Information Regarding TSTF-498, Revision 0, Risk-Informed Containment Isolation Valve Completion Times (BAW-2461), Dated June 13, 2007

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