ML15029A664
| ML15029A664 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/29/2015 |
| From: | Siva Lingam Plant Licensing Branch IV |
| To: | Richardson M Pacific Gas & Electric Co |
| References | |
| TAC MF3826, TAC MF3827 | |
| Download: ML15029A664 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Lingam, Siva Sent:
Thursday, January 29, 2015 3:53 PM To:
mjrm@pge.com Cc:
Oesterle, Eric; Wolfgang, Robert; Som, Swagata; Martinez-Navedo, Tania
Subject:
Diablo Canyon Power Station, Units 1 and 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)
The proposed subject amendment dated March 27, 2014 (Agencywide Documents Access and Management System Accession No. ML14086A426) 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 official RAIs for the subject amendment, and provide your responses within 15 days from the date of this e-mail.
RAI EPNB-1 Section 3.4 of the license amendment request states that, for each day tank, The minimum volume is obtained by considering: DG operation at full load for 60 minutes plus margin ANSI N195-1976 states that the day tank capacity shall be based on the fuel consumption at a load of 100% of the continuous rating of the diesel plus a minimum margin of 10%. Please confirm that the margin that you used is at least 10%.
RAI EEEB-1 In PG&Es submittal dated March 27, 2014, the licensee provided a summary of assumptions and results of the DG load study analysis. This DG load study analysis was performed to address the NRC resident inspector observations related to the implementation of NRC Temporary Instruction 2515/176, Emergency Diesel Generator Technical Specification Surveillance Requirements Regarding Endurance and Margin Testing, to evaluate Class 1E 4160 V Engineered Safety Features bus loading under various Design Basis Accident scenarios. The DG load study analysis appears to only consider kilowatt (kW) losses. Since the kilovolt (kV) ampere reactive (kVAR) losses will increase the current that the switchgear has to manage, please describe how the kVAR losses were considered when analyzing the DG loading.
RAI EEEB-2 The LAR proposes a new voltage range of 3980 V and 4340 V for SRs 3.8.1.2, 3.8.1.7, 3.8.1.9, 3.8.1.11, 3.8.1.12, 3.8.1.19, and 3.8.1.20. The current requirements of induction motors and other voltage sensitive equipment vary according to available voltage and frequency. Please provide excerpts from calculations with a summary that validate DG loading when operating at extremes of the proposed voltage range.
Siva P. Lingam U.S. Nuclear Regulatory Commission Project Manager (NRR/DORL/LPL4-1)
Cooper Nuclear Station Diablo Canyon Nuclear Power Plant Location: O8-D5; Mail Stop: O8-B3 Telephone: 301-415-1564; Fax: 301-415-1222 E-mail address: siva.lingam@nrc.gov
2
Hearing Identifier:
NRR_PMDA Email Number:
1838 Mail Envelope Properties (Siva.Lingam@nrc.gov20150129155300)
Subject:
Diablo Canyon Power Station, Units 1 and 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:
1/29/2015 3:53:23 PM Received Date:
1/29/2015 3:53:00 PM From:
Lingam, Siva Created By:
Siva.Lingam@nrc.gov Recipients:
"Oesterle, Eric" <Eric.Oesterle@nrc.gov>
Tracking Status: None "Wolfgang, Robert" <Robert.Wolfgang@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 "mjrm@pge.com" <mjrm@pge.com>
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 2901 1/29/2015 3:53:00 PM Options Priority:
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