ML13339A892

Draft ADS Amendment RAIs

ML13339A892
Person / Time
Site:	Susquehanna
Issue date:	12/05/2013
From:	Plant Licensing Branch 1
To:
Whited J
References
Download: ML13339A892 (3)

Text

DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT REQUEST TO CHANGE SURVEILLANCE REQUIREMENT 3.5.1.12 PPL SUSQUEHANNA, LLC SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2 DOCKET NOS. 50-387 AND 50-388 By letter dated June 6, 2013,1 PPL Susquehanna, LLC (PPL) submitted a license amendment request for Susquehanna Steam Electric Station, Units 1 and 2 (SSES). The proposed amendment would change Technical Specification (TS) Surveillance Requirement (SR) 3.5.1.12 in TS 3.5.1 ECCS - Operating. Specifically, the proposed amendments would change the current TS requirement that "each [Automatic Depressurization System] ADS valve opens when manually actuated" to the requirement that "each ADS valve actuator strokes when manually actuated, Additionally, the surveillance frequency would change from "24 months on a STAGGERED TEST BASIS for each valve solenoid" to "24 months". To complete its review, the Nuclear Regulatory Commission (NRC) staff from the Division of Safety Systems, Technical Specifications Branch (STSB), and the Division of Engineering, Instrumentation and Controls Branch (EICB), and Component Performance, None-Destructive Examination (NDE),

and Testing Branch (EPNB) request responses to the below questions.

EICB RAI 1: Provide a description of Susquehannas operating experience with single and repeated open cycling action with the Automatic Depressurization System (ADS) valves that develop the leakage. The discussion would assist the staff in understanding and considering the problem being experienced.

EICB RAI 2: Justify the technical analysis as to why the valves appear to operate within their normal design per this statement: design appears to be adequate and is not considered to be a cause for ADS valve seat leakage as a result of manual operation of the ADS valves, and according to the reference citation 7.3, under the discussion, please explain the apparent contradiction to this statement: The licensee believes that the failure of the S/RV is related to the manufacturing tolerances of the valve stem and piston assembly and to the lengthy service time without adequate inspection and maintenance. It appears that ADS valves with mechanical issues per design and wear require higher inspection surveillance.

EICB RAI 3: The cited material states that the design for a Target Rock valve does degrade and requires periodic inspection, which could mean an increased validation of valve operation is best done with the ADS valve connected to the relief positioner, yet the valves cited in the LAR are identified as Crosby valves.

1 Agencywide Documents Access and Management System Accession No. ML13158A096 DRAFT

EICB RAI 4: Provide drawings/sketches/P&IDs depicting detailed design of the physical installation of the ADS valve the licensee wants to disconnect from the positioner, so the staff can verify the ADS actuator is disconnected from the valve to ensure no damage is done to the valve seat or to the valve internals EICB RAI 5: Discuss the ADS valve position indication feedback validation testing, when following the proposed change to SR 3.5.1.12.

EICB RAI 6: Provide further discussion on the S/RVs replaced under current practices for a 24 month cycle and how a main disk exercise test (referred to on page 3 of 7) performed on all S/RVs at least once every 6 years schedule and would ensure the main disks can freely open. This discussion would aid the staff in understanding the operating history of the S/RVs.

EICB RAI 7: Provide the cited document in reference 7.2 INPO Event Report, Level 3, 11-24, "Maintenance Error results in Uncontrolled Reactor Vessel Depressurization,"

dated July 26, 2011. The cited material is not available to the NRC in its entirety. Furthermore, the redacted INPO version states the valve failed open.

The staff would like to know the relevance to this proposed licensing amendment.

EPNB RAI 1 Provide a description and drawing of the Automatic Depressurization System (ADS) valve assembly including information on the actuator such as number and arrangement of solenoids and air system arrangement.

EPNB RAI 2 Are the actual installed actuators and solenoids shipped and tested with a given ADS valve during off-site bench testing?

EPNB RAI 3 Do the set point testing program and the valve control program referred to in Sections 1 and 3 of the referenced letter implement the requirements of American Society of Mechanical Engineers (ASME) operational manager(OM)

Code for the testing of the ADS valves? Describe the specific tests performed for these valves to comply with ASME OM Code, Mandatory Appendix I, paragraph I-3310.

EPNB RAI 4 Does the Susquehanna test program for the subject ADS valves fully implement the requirements of ASME OM Code Case OMN-17? In particular, are the valves disassembled and inspected after as-found set-pressure testing?

EPNB RAI 5 Do the tests performed to satisfy TS SR 3.5.1.11 and SR 3.5.1.12 actuate each solenoid independently for a given actuator?

EPNB RAI 6 Under the proposed new wording of SR 3.5.1.12, is the existing note still necessary that allows for a twelve hour delay in testing?

EPNB RAI 7 Does deletion of on a staggered test basis for each valve solenoid from the SR 3.5.1.12 Frequency requirement mean that each solenoid on each actuator will be individually tested every 24 months?

STSB RAI 1 10 CFR 50.36(c)(3), "Surveillance requirements," requires, in part, that SRs be established to ensure that the necessary quality of components is maintained, and that facility operation will be within safety limits.

DRAFT

The proposed SR changes would eliminate the TS requirement to verify that for the ADS valves to open during manual actuation of the ADS circuitry. When performing the testing in-situ as required by the current TSs, the testing verifies that the ADS valve components actuate as designed and discharge lines are not blocked. This test provides assurance that the necessary quality of components is maintained, and that facility operation will be within safety limits.

Please provide a description of the Quality Assurance and Foreign Material Exclusion methods that will be used to provide assurance that the ADS valves that have been bench-tested will actuate as designed and that discharge lines are not blocked once the valves are installed.

DRAFT