L-PI-07-039, Supplement to License Amendment Request (LAR) for Extension of Technical Specification (TS) 3.8.1, AC Sources-Operating, Emergency Diesel Generator Completion Time
| ML071310108 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 05/10/2007 |
| From: | Wadley M Nuclear Management Co |
| To: | Document Control Desk, NRC/NRR/ADRO |
| References | |
| L-PI-07-039, TAC MC9001, TAC MC9002 | |
| Download: ML071310108 (5) | |
Text
Committed to Nuclear Excellence I-L-PI-07-039 10 CFR 50.90 U S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant Units 1 and 2 Dockets 50-282 and 50-306 License Nos. DPR-42 and DPR-60 Supplement to License Amendment Request (LAR) For Extension Of Technical Specification (TS) 3.8.1, "AC Sources-Operating," Emergency Diesel Generator Completion Time (TAC Nos. MC9001 and MC9002)
References:
- 1. License Amendment Request (LAR) For Extension Of Technical Specification (TS) 3.8.1, "AC Sources-Operating," Emergency Diesel Generator Completion Time, dated November 21, 2005, Accession Number ML053260088.
In Reference 1, Nuclear Management Company (NMC) submitted an LAR to revise the Emergency Diesel Generator (EDG) Completion Time in TS 3.8.1 Required Action B.4 from 7 days to 14 days. By letters dated June 16, 2006, August 31, 2006, September 29, 2006, October 30, 2006 and March 15, 2007, NMC provided supplemental information to this LAR. In the course of telephone discussions with the NRC Staff on April 5 and April 10, 2007, NMC proposed four new commitments to the NRC. These commitments are captured as the double underlined commitments in Enclosure 1 which includes all NMC commitments associated with Reference 1 and its supplements. This letter also revises the wording of the commitment made in the supplement dated June 16, 2006, regarding cooling water (CL) pump availability. As shown in Enclosure I, the configuration of the three CL pumps is stated explicitly to clarify the requirements of this commitment for the plant operators. NMC submits this supplement in accordance with the provisions of 10 CFR 50.90.
The supplemental information provided in this letter does not impact the conclusions of the Determination of No Significant Hazards Consideration and Environmental Assessment presented in the November 21,2005 submittal as supplemented June 16, 2006, August 31,2006, September 29, 2006, October 30,2006 and March 15,2007.
In accordance with 10 CFR 50.91, NMC is notifying the State of Minnesota of this LAR by transmitting a copy of this letter and enclosure to the designated State Official.
171 7 Wakonade Drive East Welch, Minnesota 55089-9642 Telephone: 651.388.1 121
Document Control Desk Page 2 Please address any comments or questions regarding this LAR supplement to Mr. Dale Vincent, P.E., at 1-651-388-1 121.
Summaw of Commitments of this letter provides new and revised commitments which supersede the commitments listed in Enclosure 2 of NMC letter L-PI-06-031, dated June 16, 2006, Accession Number ML062050567.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on dowaY$.
Michael D. Wadley Site Vice President, Prairie Island Nuclear Generating Plant Units 1 and 2 Nuclear Management Company, LLC Enclosures (1) cc:
Administrator, Region Ill, USNRC Project Manager, Prairie Island, USNRC Resident Inspector, Prairie Island, USNRC State of Minnesota L-PI-07-039 LIST OF COMMITMENTS Page 1 of 3 REGULATORY COMMITMENT Procedures shall be established to assure that the following provisions are invoked when an emergency diesel generator (EDG) is inoperable for an extended Completion Time in TS 3.8.1 Condition B:
The condition of the offsite power supply and switchyard will be evaluated prior to entering the extended EDG Completion Time for elective maintenance. NMC will develop a procedure to determine acceptable grid conditions for entering an extended EDG Completion Time to perform elective maintenance. An extended EDG Completion Time will not be entered to perform elective maintenance when grid stress conditions are high such as during extreme summer temperatures or high demand.
No elective maintenance will be scheduled in the switchyard that would challenge offsite power availability and no elective maintenance will be scheduled on the main, auxiliary or startup transformers associated with the unit during the proposed extended EDG Completion Time.
The system dispatcher will be contacted once per day to ensure no significant grid perturbations are expected during the extended EDG Completion Time. The system dispatcher will be informed of the EDG status, the power needs of the facility and requested to inform PlNGP if conditions change such that unacceptable voltage would occur following a unit trip.
The LC0 statement requirements of TS 3.8.1 and TS 3.8.9, for safeguards AC buses, will be met on the opposite unit (regardless of Mode) during the extended EDG Completion Time (required emergent corrective maintenance or TS required surveillance testing on EDGs, offsite paths or safeguards AC buses may be performed).
The turbine driven AFW pump on the associated unit will not be removed from service for planned maintenance DUE DATE Implementation date of the license amendment requested in letter PI 036
Page 2 of 3 REGULATORY COMMITMENT activities during the extended EDG Completion Time.
Assure operating crews are briefed on the EDG work plan and procedural actions regarding:
o LOOP and SBO o 4 kV safeguards bus cross-tie o Reactor Coolant System bleed and feed.
Weather conditions will be evaluated prior to entering the extended EDG Completion Time for elective maintenance. An extended EDG Completion Time will not be entered for elective maintenance purposes if official weather forecasts are predicting severe conditions (tornado or thunderstorm warnings).
12 and 22-cooling water (CL) pumps will be operable and 121 CL pump will be available and aligned to the operable Unit 2 EDG when a Unit 2 EDG is in an extended Completion Time, except required emergent corrective maintenance or TS required surveillance testing on theses&cpwk CL pumps or Unit 2 EDGs may be performed if required.
Assess the overall impact of maintenance on plant risk using a Configuration Risk Manaaement Proaram before entering TS 3.8.1 Condition B for planned EDG maintenance activities.
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Unit 1 and Unit 2 safeguards buses are available before entering the TS 3.8.1 Condition B for extended EDG maintenance activities.
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NMC shall submit a License Amendment Request which proposes changes to the Technical Specifications in Appendix A. similar to current plant procedural practices, which will require the Unit 1 monthlv Emergency Diesel Generators load test (SR 3.8.1.3) to be performed at or above 90% of the diesel generator's continuous power ratina.
DUE DATE Auaust 31.2007
Page 3 of 3 REGULATORY COMMITMENT NMC shall submit a License Amendment Request which proposes changes to the Technical Specifications in Appendix A which will require the 24-hour Emeruencv Diesel Generators load test (SR 3.8. I
.9) to be performed at or below a specified power factor. These chanaes shall be consistent with the guidance in NUREG-1431. "Improved Technical Specifications, Westinghouse Plants", Revision 3.1. SR 3.8.1.14.
DUE DATE October 31 : 2007