GNRO-2015/00066, Submits Supplemental Response to Bulletin 88-04, Potential Safety-Related Pump Loss: Difference between revisions
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Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 | Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 | ||
*~Entergy Entergy Operations, Inc. | *~Entergy Entergy Operations, Inc. | ||
P. O. Box 756 Port Gibson, MS 39150 James Nadeau Manager, Regulatory Assurance Grand Gulf Nuclear Station Tel. (601) 437-2103 GNRO-2015/00066 November 6, 2015 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 | P. O. Box 756 Port Gibson, MS 39150 James Nadeau Manager, Regulatory Assurance Grand Gulf Nuclear Station Tel. (601) 437-2103 GNRO-2015/00066 November 6, 2015 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 | ||
Revision as of 07:52, 5 February 2020
| ML15310A323 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 11/06/2015 |
| From: | Nadeau J Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GNRO-2015/00066, IEB-88-004 | |
| Download: ML15310A323 (3) | |
Text
- ~Entergy Entergy Operations, Inc.
P. O. Box 756 Port Gibson, MS 39150 James Nadeau Manager, Regulatory Assurance Grand Gulf Nuclear Station Tel. (601) 437-2103 GNRO-2015/00066 November 6, 2015 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
Supplemental Response to Bulletin 88-04, Potential Safety-Related Pump Loss Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29
REFERENCES:
- 1.Bulletin 88-04, Potential Safety-Related Pump Loss, Dated May 5, 1988
- 2. Letter: AECM-88/0158, Potential Safety-Related Pump Loss
Dear Sir or Madam:
Entergy Operations, Inc. (Entergy), based on concerns raised during the Region IV Component Design Basis Inspection (05000418/2015007) at the Grand Gulf Nuclear Station, has conducted a review of the data requested in Bulletin 88-04, Entergy's response to Bulletin 88-04 as documented in AECM-88/0158, and the design basis for the applicable safety related systems.
These reviews revealed the need to submit supplemental data for the High Pressure Core Spray Pumps (HPCS), Residual Heat Removal Pumps (RHR), and the Low Pressure Core Spray Pumps (LPCS) to ensure Entergy's response is complete and accurate.
Entergy has evaluated and determined that the current minimum flow rates are sufficient to ensure that there will be no pump damage from low flow operation. The final minimum flow analyses performed by the vendor for Entergy for the HPCS, RHR, and LPCS pumps are:
HPCS Pump:
A minimum flow rate of 2200 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 1500 gpm for intermittent operation for an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1000 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
GNRO-2015/00066 Page 2 of 3 RHR Pumps:
A minimum flow rate of 2200 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 1500 gpm for intermittent operation for an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1000 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
LPCS Pump:
A minimum flow rate of 3000 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 2200 gpm for intermittent operation an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1200 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
Based on the data, design, and configuration of the above systems, Entergy has concluded:
- 1) The minimum flow values and limits identified above are sufficient to prevent pump damage under low flow operations.
- 2) The pumps identified above do not use a common minimum flow line, thus there is no concern for a negative pump-to-pump interaction through a minimum flow line.
- 3) The pumps identified above only experience minimum flow conditions during startup and shutdown.
- 4) No pump minimum flow piping configuration changes have been implemented or planned that could result in a negative pump-to-pump interaction.
- 5) No damage has occurred and no repairs have been required due to operating the above pumps under minimum flow conditions.
This letter contains no new commitments. If you have any questions or require additional information, please contact James Nadeau at 601-437-2103.
Sincerely, JJN/ram cc: (see page 3)
GNRO-2015/00066 Page 3 of 3 cc: (continued)
U.S. Nuclear Regulatory Commission ATIN: Mr. A. Wang, NRRlDORL Mail Stop OWFN/8 G14 11555 Rockville Pike Rockville, MD 20852-2378 NRC Senior Resident Inspector Grand Gulf Nuclear Station .
Port Gibson, MS 39150 U. S. Nuclear Regulatory Commission ATIN: Marc L. Dapas (w/2)
Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511
- ~Entergy Entergy Operations, Inc.
P. O. Box 756 Port Gibson, MS 39150 James Nadeau Manager, Regulatory Assurance Grand Gulf Nuclear Station Tel. (601) 437-2103 GNRO-2015/00066 November 6, 2015 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
Supplemental Response to Bulletin 88-04, Potential Safety-Related Pump Loss Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29
REFERENCES:
- 1.Bulletin 88-04, Potential Safety-Related Pump Loss, Dated May 5, 1988
- 2. Letter: AECM-88/0158, Potential Safety-Related Pump Loss
Dear Sir or Madam:
Entergy Operations, Inc. (Entergy), based on concerns raised during the Region IV Component Design Basis Inspection (05000418/2015007) at the Grand Gulf Nuclear Station, has conducted a review of the data requested in Bulletin 88-04, Entergy's response to Bulletin 88-04 as documented in AECM-88/0158, and the design basis for the applicable safety related systems.
These reviews revealed the need to submit supplemental data for the High Pressure Core Spray Pumps (HPCS), Residual Heat Removal Pumps (RHR), and the Low Pressure Core Spray Pumps (LPCS) to ensure Entergy's response is complete and accurate.
Entergy has evaluated and determined that the current minimum flow rates are sufficient to ensure that there will be no pump damage from low flow operation. The final minimum flow analyses performed by the vendor for Entergy for the HPCS, RHR, and LPCS pumps are:
HPCS Pump:
A minimum flow rate of 2200 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 1500 gpm for intermittent operation for an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1000 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
GNRO-2015/00066 Page 2 of 3 RHR Pumps:
A minimum flow rate of 2200 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 1500 gpm for intermittent operation for an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1000 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
LPCS Pump:
A minimum flow rate of 3000 gpm for continuous operation in excess of 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> annually.
A minimum flow rate of 2200 gpm for intermittent operation an annual accumulation of 60 to 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />.
A minimum flow rate of 1200 gpm for an annual accumulation of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
Based on the data, design, and configuration of the above systems, Entergy has concluded:
- 1) The minimum flow values and limits identified above are sufficient to prevent pump damage under low flow operations.
- 2) The pumps identified above do not use a common minimum flow line, thus there is no concern for a negative pump-to-pump interaction through a minimum flow line.
- 3) The pumps identified above only experience minimum flow conditions during startup and shutdown.
- 4) No pump minimum flow piping configuration changes have been implemented or planned that could result in a negative pump-to-pump interaction.
- 5) No damage has occurred and no repairs have been required due to operating the above pumps under minimum flow conditions.
This letter contains no new commitments. If you have any questions or require additional information, please contact James Nadeau at 601-437-2103.
Sincerely, JJN/ram cc: (see page 3)
GNRO-2015/00066 Page 3 of 3 cc: (continued)
U.S. Nuclear Regulatory Commission ATIN: Mr. A. Wang, NRRlDORL Mail Stop OWFN/8 G14 11555 Rockville Pike Rockville, MD 20852-2378 NRC Senior Resident Inspector Grand Gulf Nuclear Station .
Port Gibson, MS 39150 U. S. Nuclear Regulatory Commission ATIN: Marc L. Dapas (w/2)
Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511