ML15089A155

NRR E-mail Capture - Diablo Units 1 and 2 - (Round 2) Requests for Additional Information (Rais) for License Amendment Request 14-01 Associated with Revision to TS 3.8.1, AC Sources - Operating (TAC Nos. MF3826 and MF3827)

ML15089A155
Person / Time
Site:	Diablo Canyon
Issue date:	03/25/2015
From:	Eric Oesterle Plant Licensing Branch IV
To:	Richardson M Pacific Gas & Electric Co
References
TAC MF3826, TAC MF3827
Download: ML15089A155 (2)

Text

NRR-PMDAPEm Resource From: Oesterle, Eric Sent: Wednesday, March 25, 2015 12:55 PM To: Richardson, Michael Cc: Lingam, Siva; Som, Swagata; Martinez-Navedo, Tania; Mathew, Roy

Subject:

Diablo Units 1 and 2 - [Round 2] Requests for Additional Information (RAIs) for License Amendment Request 14-01 Associated with Revision to TS 3.8.1, "AC Sources - Operating" (TAC Nos. MF3826 and MF3827)

Importance: High The proposed subject amendment dated March 27, 2014 (Agencywide Documents Access and Management System Accession No. ML14086A426) and supplemented by letter dated February 19, 2015 (ADAMS Accession No. ML15050A389), would revise technical specification (TS) surveillance requirements (SRs) associated with emergency diesel generators (DGs) for Diablo Canyon Power Station, Units 1 and 2. The proposed changes reflect the results of a revised load study analysis, as well as a revision to the DG 30-minute load rating. These changes were submitted to address multiple issues identified by U.S. Nuclear Regulatory Commission (NRC) and Pacific Gas and Electric Company (PG&E or the licensee) investigations, and are intended to correct various non-conservative TS SRs/values associated with DG testing.

Please note the following additional official RAIs for the subject amendment, and provide your responses no later than 30 days from the date of this e-mail. Providing responses early than 30 days may help to facilitate completion of NRC staff review.

1. Diablo Canyon Power Plant is revising the proposed voltage limit in SR 3.8.1.10 from 5075V to 5096V, please explain why this new voltage limit is acceptable such that none of the components, including the generator, will be adversely affected, damaged or tripped.

2. Please confirm that the stored diesel fuel oil volume requirements specified in Technical Specification 3.8.3. A and B remain valid for the proposed Emergency Diesel Generator (EDG) loading requirements as a result of variations in EDG frequency and voltage.

Eric R. Oesterle Acting NRC Project Manager Diablo Canyon NRR/DORL/LPL4-1 301-415-1014 1

Hearing Identifier: NRR_PMDA Email Number: 1955 Mail Envelope Properties (6566BAEC3DB1314381965386524904EC02BA541E7BDD)

Subject:

Diablo Units 1 and 2 - [Round 2] Requests for Additional Information (RAIs) for License Amendment Request 14-01 Associated with Revision to TS 3.8.1, "AC Sources - Operating" (TAC Nos. MF3826 and MF3827)

Sent Date: 3/25/2015 12:55:02 PM Received Date: 3/25/2015 12:55:03 PM From: Oesterle, Eric Created By: Eric.Oesterle@nrc.gov Recipients:

"Lingam, Siva" <Siva.Lingam@nrc.gov>

Tracking Status: None "Som, Swagata" <Swagata.Som@nrc.gov>

Tracking Status: None "Martinez-Navedo, Tania" <Tania.Martinez-Navedo@nrc.gov>

Tracking Status: None "Mathew, Roy" <Roy.Mathew@nrc.gov>

Tracking Status: None "Richardson, Michael" <MJRm@pge.com>

Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 1694 3/25/2015 12:55:03 PM Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: