ML14177A731

Hardened Containment Venting System (HCVS) Phase 1 Overall Integrated Plan, Pages 31 Through 52

ML14177A731
Person / Time
Site:	Susquehanna
Issue date:	06/26/2014
From:	Susquehanna
To:	Office of Nuclear Reactor Regulation
References
EA-13-109, PLA-7180
Download: ML14177A731 (22)

Text

Enclosure to PLA-7180 Page 31 of 52 Part 3: Boundary Conditions for Dry Well Vent NOTE: This is a Phase 2 Action - Information will be included in a future update.

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c Provide a sequence of events and identify any time constraint required for success including the basis for the time constraint.

HCVS Actions that have a time constraint to be successful should be identified with a technical basis and a justification provided that the time can reasonably be met (for example, a walk-through of deployment).

Describe in detail in this section the technical basis for the time constraint identified on the sequence of events timeline Attachment 2B See attached sequence of events time line (Attachment 2B ).

Ref: EA-13-109 Section X.X.X I NEI 13-02 Section X.X.x

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Severe Accident Venting Determine venting capability for Severe Accident Venting, such as may be used in an ELAP scenario to mitigate core damage.

Ref: EA-13-109 Section X.X.X I NEI 13-02 Section X.X.x First 24 Hour Coping Detail Provide a general description of the venting actions for first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> using installed equipment including station modifications that are proposed.

Ref: EA-13-109 Section X.X.X I NEI 13-02 Section X.X.x Greater Than 24 Hour Coping Detail Provide a general description of the venting actions for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> using portable and installed equipment including station modifications that are proposed.

Enclosure to PLA-7180 Page 32 of 52 Part 3: Boundary Conditions for Dry Well Vent NOTE: This is a Phase 2 Action - Information will be included in a future update.

Ref: EA-13-109 Section X.X.X I NEI 13-02 Section X.X.x Details:

Provide a brief description of Procedures I Guidelines:

Confirm that procedure/guidance exists or will be developed to support implementation.

Identify modifications:

List modifications and describe how they support the HCVS Actions.

Key Venting Parameters:

List instrumentation credited for the venting HCVS Actions.

Notes:

Enclosure to PLA-7180 Page 33 of 52 Part 4: Programmatic Controls, Training, Drills and Maintenance Identify how the programmatic controls will be met.

Provide a description of the programmatic controls equipment protection, storage and deployment and equipment quality addressing the impact of temperature and environment Ref: EA-13-109 Section 3.1, 3.2/ NEI 13-02 Section 6.1.2, 6.1.3, 6.2 Program Controls:

The HCVS venting actions will include:

• Site procedures and programs are being developed in accordance with NEI 13-02 to address use and storage of portable equipment relative to the Severe Accident defined in NRC Order EA-13-109 and the hazards applicable to the site per Part 1 of this OIP.

• Routes for transporting portable equipment from storage location(s) to deployment areas will be developed as the response details are identified and finalized. The identified paths and deployment areas will be accessible during all modes of operation and during Severe Accidents.

Procedures:

Procedures will be established for system operations when normal electrical supply is available, and during ELAP conditions.

The HCVS procedures will be developed and implemented following the plants process for initiating or revising procedures and contain the following details:

• appropriate conditions and criteria for use of the HCVS when and how to place the HCVS in operation, the location of system components,

• instrumentation available,

• normal electrical supplies,

• directions for sustained operation, including the storage location of portable equipment,

• training on operating the portable equipment, and

• testing of portable equipment Susquehanna will establish and document provisions for out-of-service requirements of the HCVS and compensatory measures.

The provisions for out-of-service requirements for HCVS functionality are applicable in Modes 1, 2 and 3.

Enclosure to PLA-7180 Page 34 of 52 Part 4: Programmatic Controls, Training, Drills and Maintenance r,

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• If for up to 90 consecutive days, the primary or alternate means of HCVS operation are non-functional, no compensatory actions are necessary.

• If for up to 30 days, the primary and alternate means of HCVS operation are non-functional, no compensatory actions are necessary.

• If the out of service times exceed 30 or 90 days as described above, the following action will be performed:

o The condition will entered into the corrective action system, o The HCVS functionality will be restored in a manner consistent with plant procedures, o A cause assessment will be performed to prevent future loss of function for similar causes.

o Initiate action to implement appropriate compensatory actions

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Describe training plan List training plans for affected organizations or describe the plan for training development Ref: EA-13-109 Section 3.2 I NEI 13-02 Section 6.1.3 Personnel expected to perform direct execution of the HCVS will receive necessary training in the use of plant procedures for system operations. The training will be refreshed on a periodic basis and as any changes occur to the HCVS. Training content and frequency will be established using the Systematic Approach to Training (SAT) process.

In addition, (reference NEI 12-06) all personnel on-site will be available to supplement trained personnel.

Identify how the drills and exercise parameters will be met.

Alignment with NEI 13-06 and 14-01 as codified in NTTF Recommendation 8 and 9 rulemaking The Licensee should demonstrate use of the HCVS system in drills, tabletops, or exercises as follows:

Enclosure to PLA-7180 Page 35 of 52 Part 4: Programmatic Controls, Training, Drills and Maintenance Hardened containment vent operation on normal power sources (no ELAP).

During FLEX demonstrations (as required by EA-12-049: Hardened containment vent operation from primary or alternate location during conditions of ELAP/loss of UHS with no core damage. System use is for containment heat removal AND containment pressure control.

HCVS operation from primary or alternate location during conditions of ELAP/loss of UHS with core damage. System use is for containment heat removal AND containment pressure control with potential for combustible gases (Demonstration may be in conjunction with SAG change).

Ref: EA-13-109 Section 3.1 I NEI 13-02 Section 6.1.3 The site will utilize the guidance provided in NEI 13-06 and 14-01 for guidance related to drills, tabletops, or exercises for HCVS operation. In addition, the site will integrate these requirements with compliance to any rulemaking resulting from the NTTF Recommendations 8 and 9.

Describe maintenance plan:

The HCVS maintenance program should ensure that the HCVS equipment reliability is being achieved in a manner similar to that required for FLEX equipment. Standard industry templates (e.g., EPRI) and associated bases may be developed to define specific maintenance and testing.

o Periodic testing and frequency should be determined based on equipment type, expected use and manufacturer's recommendations (further details are provided in Section 6 of this document).

o Testing should be done to verify design requirements and/or basis. The basis should be documented and deviations from vendor recommendations and applicable standards should be justified.

o Preventive maintenance should be determined based on equipment type and expected use. The basis should be documented and deviations from vendor recommendations and applicable standards should be justified.

o Existing work control processes may be used to control maintenance and testing.

HCVS permanent installed equipment should be maintained in a manner that is consistent with assuring that it performs its function when required.

o HCVS permanently installed equipment should be subject to maintenance and testing guidance provided to verify proper function.

Enclosure to PLA-7180 Page 36 of 52 Part 4: Programmatic Controls2 Training2 Drills and Maintenance

• HCVS non-installed equipment should be stored and maintained in a manner that is consistent with assuring that it does not degrade over long periods of storage and that it is accessible for periodic maintenance and testing.

Ref: EA-13-109 Section 1.2.13/ NEI 13-02 Section 5.4, 6.2 The site will utilize the standard EPRI industry PM process (Similar to the Preventive Maintenance Basis Database) for establishing the maintenance calibration and testing actions for HCVS components. The control program will include maintenance guidance, testing procedures and frequencies established based on type of equipment and considerations made within the EPRI guidelines.

Susquehanna will implement the following operation, testing and inspection requirements for the HCVS to ensure reliable operation of the system.

Table 4-1: Testing and Inspection Requirements Description Frequency Cycle the HCVS valves and the interfacing Once per operating cycle system valves not used to maintain containment integrity.

Perform visual inspections and a walk Once per operating cycle down of HCVS components Test and calibrate the HCVS radiation Once per operating cycle monitors.

Leak test the HCVS.

(1) Prior to first declaring the system functional; (2) Once every three operating cycles thereafter; and (3) After restoration of any breach of system boundary within the buildings

Enclosure to PLA-7180 Page 37 of 52 Part 4: Programmatic Controls~ Training~ Drills and Maintenance Validate the HCVS operating procedures Once every other operating cycle by conducting an open/close test of the HCVS control logic from its control panel and ensuring that all interfacing system valves move to their proper (intended) positions.

Notes:

Part 5: Milestone Schedule 1'1.'

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Provide a milestone schedule. This schedule should include:

• Modifications timeline

• Procedure guidance development complete 0

HCVS Actions 0

Maintenance

• Long term use equipment acquisition timeline

• Training completion for the HCVS Actions

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Enclosure to PLA-7180 Page 38 of 52 The dates specifically required by the order are obligated or committed dates. Other dates are planned dates subject to change. Updates will be provided in the periodic (six-month) status reports.

Ref: EA-13-109 Section D.1, D.3 I NEI 13-02 Section 7.2.1 The following milestone schedule is provided. The dates are planning dates subject to change as design and implementation details are developed. Any changes to the following target dates will be reflected in the subsequent 6-month status reports.

Comments Target Activity

{Include date Milestone Completion Date Status changes in this columnl Hold preliminary/conceptual design meeting Jun.2014 Complete Submit Overall Integrated Implementation Jun.2014 Complete Plan Submit 6 Month Status Report Dec. 2014 Submit 6 Month Status Report Jun. 2015 Submit 6 Month Status Report Dec. 2015 Simultaneous with Phase 2 OIP U2 Design Engineering Complete Mar. 2016

Part 5: Milestone Schedule Submit 6 Month Status Report Jun.2016 U2 Operations Procedure Changes Dec. 2016 Developed U2 Maintenance Procedures Developed Dec. 2016 Submit 6 Month Status Report Dec. 2016 U2 Training Complete Dec. 2016 U2 Implementation Outage Feb.2017 U2 Procedure Changes Active Mar. 2017 U2 Walk Through Mar. 2017 Demonstration/Functional Test U1 Design Engineering Complete Mar. 2017 Submit 6 Month Status Report Jun. 2017 Submit 6 Month Status Report Dec. 2017 U 1 Operations Procedure Changes Dec. 2017 Developed U1 Maintenance Procedures Developed Dec. 2017 U 1 Training Complete Dec, 2017 U1 Implementation Outage Feb.2018 U 1 Procedure Changes Active Mar. 2018 U1 Walk Through Demonstration/Functional Mar. 2018 Test Submit Completion Report May 2018 Enclosure to PLA-7180 Page 39 of 52

HCVS Portable Egui:ument BDBEE Severe Pe1jormance List portable equipment Venting Accident Criteria Venting Nitrogen Cylinders X

X TBD FLEX Electrical Generator X

X TBD Enclosure to PLA-7180 Page 40 of 52 Maintenance I PM requirements Check periodically for pressure, replace or replenish as needed Per Response to EA-12-049

Sequence of Events Timeline SBO Enclosure to PLA-7180 Page 41 of 52 Case 1 J

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Flex Successful Ref: SSES FLEX OIP No t= 1hr I

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I t=8hrs Legend Adequate Core Cooling mainta.ined Injection Lost Increased Shine and Leakage of Radionuclide primarily from Wetwell HCVS Post Core Damage Dose Evaluation Required T

Level at TAF t= 23hrs Table 2: Wet Well HCVS Timeline t= 24hrs t= 34hrs Case2 RCIC Late Failure Ref: SECY-12-0157 Case3 RCIC Early Failure Ref: SOARCA I Not to Scale I

Conceptual Sketches Sketch 1:

Electrical Layout of System Sketch 2:

P&ID Layout of HCVS Sketch 3:

Piping routing for vent path Unit 2 Sketch 4:

Remote Operating Station Layout Sketch 5:

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Enclosure to PLA-7180 Page 47 of 52 7

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Functional Failure Mode Failure of Vent to Open on Demand Failure of Vent to Open on Demand Failure of Vent to Open on Demand Failure of Vent to Open on Demand Failure of Vent to Open/close on Demand : Failure Evaluation Table Table 4A: Wet Well HCVS Failure Evaluation Table Failure Cause Alternate Action Valves fail to open due to Open three way valve provided at loss of AC power to ROS to bypass solenoid valves.

solenoid valves or This action directs gas supply to the complete loss of HCVS valves to open valves on demand power supply Valve fails to open due to Open three way valve provided at failure of solenoid valve ROS to bypass failed solenoid valve.

Valves fail to open due to Recharge station service batteries loss of HCVS power with 4 kV FLEX generators, supply (long term) considering severe accident conditions Valves fail to open due to Tie-in portable gas supply to loss of alternate pneumatic pneumatic system supporting HCVS air supply (long term) valves, replace portable supply, as needed.

Valve fails to open/close No alternate action credited since due to valve or valve valves may not be accessible.

actuator failure Enclosure to PLA-7180 Page 48 of 52 Failure with Alternate Action Impact on Containment Venting?

No No No No Yes

References Enclosure to PLA-7180 Page 49 of 52

1.

Generic Letter 89-16, Installation of a Hardened Wetwell Vent, dated September 1, 1989

2.

Order EA-12-049, Mitigation Strategies for Beyond-Design-Basis External Events, dated March 12, 2012

3.

Order EA-12-050, Reliable Hardened Containment Vents, dated March 12, 2012

4.

Order EA-12-051, Reliable SFP Level Instrumentation, dated March 12, 2012

5.

Order EA-13-109, Severe Accident Reliable Hardened Containment Vents, dated June 6, 2013

6.

JLD-ISG-2012-01, Compliance with Order EA-12-049, Mitigation Strategies for Beyond-Design-Basis External Events, dated August 29, 2012

7.

JLD-ISG-2012-02, Compliance with Order EA-12-050, Reliable Hardened Containment Vents, dated August 29, 2012

8.

JLD-ISG-2013-02, Compliance with Order EA-13-109, Severe Accident Reliable Hardened Containment Vents, dated November 14,2013

9.

NRC Responses to Public Comments, Japan Lessons-Learned Project Directorate Interim Staff Guidance JLD-ISG-2012-02: Compliance with Order EA-12-050, Order Modifying Licenses with Regard to Reliable Hardened Containment Vents, ADAMS Accession No. ML12229A477, dated August 29, 2012

10.

NEI 12-06, Diverse and Flexible Coping Strategies (FLEX) Implementation Guide, Revision 1, dated August 2012

11.

NEI 13-02, Industry Guidance for Compliance with Order EA-13-1 09, Revision 0, dated November 2013

12.

NEI 13-06, Enhancements to Emergency Response Capabilities for Beyond Design Basis Accidents and Events, Revision 0, dated March 2014

13.

NEI 14-01, Emergency Response Procedures and Guidelines for Extreme Events and Severe Accidents, Revision 0, dated March 2014

14.

NEI FAQ HCVS-01, HCVS Primary Controls and Alternate Controls and Monitoring Locations

15.

NEI FAQ HCVS-02, HCVS Dedicated Equipment

16.

NEI FAQ HCVS-03, HCVS Alternate Control Operating Mechanisms

17.

NEI FAQ HCVS-04, HCVS Release Point

18.

NEI FAQ HCVS-05, HCVS Control and 'Boundary Valves'

19.

NEI FAQ HCVS-06, FLEX Assumptions/HCVS Generic Assumptions

20.

NEI FAQ HCVS-07, Consideration of Release from Spent Fuel Pool Anomalies

21.

NEI FAQ HCVS-08, HCVS Instrument Qualifications

22.

NEI FAQ HCVS-09, Use of Toolbox Actions for Personnel Enclosure to PLA-7180 Page 50 of 52

23.

NEI White Paper HCVS-WP-01, HCVS Dedicated Power and Motive Force

24.

NEI White Paper HCVS-WP-02, HCVS Cyclic Operations Approach

25.

NEI White Paper HCVS-WP-03, Hydrogen/CO Control Measures

26.

NEI White Paper HCVS-WP-04, FLEX/HCVS Interactions

27.

IEEE Standard 344-1975, IEEE Recommended Practice for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations,

28.

SSES EA-12-049 (FLEX) Overall Integrated Implementation Plan, Rev 0, February 2013

29.

SSES EA-12-050 (HCVS) Overall Integrated Implementation Plan, Rev 0, February 2013

30.

SSES EA-12-051 (SFP LI) Overall Integrated Implementation Plan, Rev 0, February 2013

31.

E0-000-1 03 - Primary Containment Control

32.

EP-PS-004-Primary Containment and RPV Venting

Enclosure to PLA-7180 Page 51 of 52 : Changes/Updates to this Overall Integrated Implementation Plan Any significant changes to this plan will be communicated to the NRC staff in the 6 Month Status Reports

Open Item 1

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Enclosure to PLA-7180 Page 52 of 52 : List of Overall Integrated Plan Open Items Action Comment Confirm suppression pool heat capacity Confirmatory Action Deployment under severe accident conditions will be confirmed for the Confirmatory Action deployment of the FLEX generators credited to re-energize battery chargers.

Deployment under severe accident conditions will be confirmed for the Confirmatory Action deployment of the supplemental nitrogen bottles.

The gas supply will be sized to support HCVS operation for a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (a minimum of 12 valve cycles of valve operation is assumed, consistent Confirmatory Action with recommendations in HCVS-WP-02). This design assumption will require future validation in the design phase of this project.

An assessment of temperature and radiological conditions will be performed to ensure that operating personnel can safely access and operate controls at the Confirmatory Action remote operating station, based on time constraints listed in Attachment 2.

Evaluate viable options to address Hydrogen detonation concerns in HCVS piping to meet the requirements ofEA-13-109, Section 1.2.11 and incorporate Confirmatory Action in HCVS design. SSES will determine the method to be deployed once NRC review of HCVS-WP-03 is complete.

An evaluation will be performed to confirm the HCVS power supply can Confirmatory Action support HCVS operation for a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.