GO2-16-085, Columbia - Response to Third Request for Additional Information Related to an Amendment to Adopt Technical Specification Task Force (TSTF)-425, Revision 3 to Relocate Specific Surveillance Frequencies to a Licensee Controlled Program

Columbia - Response to Third Request for Additional Information Related to an Amendment to Adopt Technical Specification Task Force (TSTF)-425, Revision 3 to Relocate Specific Surveillance Frequencies to a Licensee Controlled Program

ML16174A432
Person / Time
Site:	Columbia
Issue date:	06/22/2016
From:	Hettel W G Energy Northwest
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GO2-16-085
Download: ML16174A432 (3)

Text

William G. Hettel Vice President, Operations P.O. Box 968, Mail Drop PE23 Richland, WA 99352-0968 Ph. 509-377-8311 F. 509-377-4674 wghettel@energy-northwest.com GO2-16-085 10 CFR 50.90 U.S. Nuclear Regulat ory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

Subject:

COLUMBIA GENERATING STATION, DOCKET NO. 50-397 RESPONSE TO THIRD REQUEST FOR ADDITIONAL INFORMATION (RAI) RELATED TO AN AMENDMENT TO ADOPT TECHNICAL SPECIFICATION TASK FORCE (TSTF)-425, REVISION 3 TO RELOCATE SPECIFIC SURVEILLANCE FREQUENCIES TO A LICENSEE CONTROLLED PROGRAM

References:

1. Letters from Energy Northwest to NRC, dated March 17, 2015 (ADAMS Accession Number ML15093A178), September 17, 2015 (ADAMS Accession Number ML15260A570), October 29, 2015 (ADAMS Accession Number ML15302A492), and April 7, 2016, (ADAMS Accession Number ML160984A387) 2.Emails from NRC to Ener gy Northwest, dated August 12, 2015 (ADAMS Accession Number ML15224B646), March 9, 2016 (ADAMS Accession Number ML16069A359), and May 31, 2016, (ADAMS Accession Number not yet assigned)

Dear Sir or Madam:

The Reference 1 letters submitted and supplemented a License Amendment Request (LAR) by Energy Northwest for Columbia Generating Station (Columbia) to Adopt Technical Specification Task Force (TSTF)-425, Revision 3 to Relocate Specific Surveillance Frequencies to a Licensee Contro lled Program. The Reference 2 emails transmitted three sets of Requests for Addi tional Information (RAI) questions from the Nuclear Regulatory Commission (NRC) related to Energy Northwest's probabilistic risk assessment (PRA) model in re lation to the subject LAR.

G02-16-085 Page 2 of 2 In response to Reference 2 email dated May 31, 2016 (ADAMS Accession Number not yet assigned)

Energy Northwest is submitting as Attachment 1, its response to the Third Request for Additional Information related to an Amendment to Adopt Technical Specification Task Force (TSTF)-425, Revision 3 to Relocate Specific Surveillance Frequencies to a Licensee Controlled Program. The No Significant Hazards Consideration Determination (NSHCD) provided in the original submittal is not altered by this submittal.

This letter and its attachment contain no regulatory commitments.

If there are any questions or if additional information is needed, please contact Ms. L. L. Williams, Licensing Supervisor, at 509-377-8148.

I declare under penalty of perjury that the foregoing is true and correct. Executed this zo day of -:ru (VI--' 2016. Respectfully, W.G. Hettel Vice President, Operations Attachments:

As stated cc: NRC Region IV Administrator NRC NRR Project Manager NRG Sr. Resident Inspector

-988C CD Sonoda -BPN1399 (email) WA Horin -Winston & Strawn RR Cowley -WDOH (email) EFSECutc.wa.gov

-EFSEC (email)

GO2-16-085 Page 1 of 1

RESPONSE TO SECOND REQUEST FOR ADDITIONAL INFORMATION NRC Request:

The licensee is asked to resubmit the response to RAI question PRA RAI 1.1 a) submitted to the licensee on March 9, 2017 which states;

a. The peer review F&O 1-3 states "In almo st all of the post-in itiator Human Error Probabilities (HEPs) where optimal stress is assumed, time is a factor with core damage

occurring between 30 minutes and an hours."

Clarify if these post-initiator HEPs were assumed to be optimal stress in all cases involving this time frame or if such HEPs were determined on a case-by-case basis to represent optimal stress or high stress as appropriate. Please describe your process to make this determination.

Energy Northwest Response:

These post-initiator HEP's were not assumed to be optimal stress in all cases, including the time frame of 30 minutes and an hour.

Post-initiators HEP stress levels were dete rmined on a case-by-case basis to represent

optimal (Low), moderate stress or high st ress as appropriate, including those where time is a factor with core damage o ccurring between 30 minutes and an hour. The determination of stress was made using t he Execution Stress decision tree in the Human Reliability Analysis (HRA) Calculator.