AEP-NRC-2023-30, Follow-Up Notification of Ph Non-Compliance for Turbine Room Sump
| ML23152A056 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 06/01/2023 |
| From: | Scarpello M Indiana Michigan Power Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| AEP-NRC-2023-30 | |
| Download: ML23152A056 (1) | |
Text
INDIANA MICHIGAN POWER Indiana Michigan Power Cook Nuclear Plant One Cook Place Bridgman, Ml 49106 indianamichiganpower.com An AEP Company B O U N D L E S S E N E R G Y June 1, 2023 Docket Nos.: 50-315 50-316 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 AEP-NRC-2023-30 10 CFR 50.4 Donald C. Cook Nuclear Plant Units 1 and 2 FOLLOW UP NOTIFICATION OF PH NON-COMPLIANCE FOR TURBINE ROOM SUMP
References:
1. Letter from M. K. Scarpello, Indiana Michigan Power Company, to Document Control Desk, U.S. Nuclear Regulatory Commission, "Notification of PH Non-Compliance for Turbine Room Sump," dated April 12, 2023 (ML23102A151).
- 2. Letter from C. A. Blosser, Indiana Michigan Power Company, to J. Klang, Michigan Department of Environmental Quality - Great Lakes and Energy, "Donald C. Cook Nuclear Plant Groundwater Discharge Permit GW 1810102," dated May 17, 2023.
By Reference 1, Indiana Michigan Power Company (l&M), the licensee for Donald C. Cook Nuclear Plant (CNP) Units 1 and 2, provided notification of a pH non-compliance for Outfall 00D (Turbine Room Sump). By Reference 2, I&M submitted to the Michigan Department of Environmental Quality - Great Lakes and Energy, a follow up notification of pH non-compliance for Outfall 00D. Reference 2 is provided, as an enclosure to this letter, in accordance with CNP's Technical Specification, Environmental Protection Plan, Section 5.4.2, "Non-Routine Reports."
On March 24, 2023, a discharge occurred from Outfall 00D that was below the minimum pH permit limit of 6.5. Approximately 39,000 gallons of water were discharged to the on-site absorption pond with a pH value between 3.5 and 6.0. The next discharge, which also occurred on March 24, 2023, had a value of 9.4, which was within the proper pH limit. Follow up samples of downgradient wells were taken and indicated within limit pH values of 7.06 and 7.85. CNP has not observed any environmental impact from this discharge. Corrective actions have been implemented to prevent reoccurrence.
U. S. Nuclear Regulatory Commission Page 2 AEP-NRC-2023-30 This letter contains no new or revised commitments. Should you have any questions please contact Chris A Blosser, Environmental Manager, at (269) 465-5901, extension 2579.
Michael K. Scarpello Regulatory Affairs Director
Enclosure:
Letter from C. A Blosser, Indiana Michigan Power Company, to J. Klang, Michigan Department of Environmental Quality - Great Lakes and Energy, "Donald C. Cook Nuclear Plant Groundwater Discharge Permit GW 1810102," dated May 17, 2023.
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EGLE -- RMD/RPS J. B. Giessner - NRC Region Ill NRC Resident Inspector N. Quilco - MPSC R. M. Sistevaris - AEP Ft. Wayne S. P. Wall-NRC Washington, D.C.
A J. Williamson -AEP Ft. Wayne
ENCLOSURE TO AEP-NRC-2023-30 Letter from C. A Blosser, Indiana Michigan Power Company, to J. Klang, Michigan Department of Environmental Quality - Great Lakes and Energy, "Donald C. Cook Nuclear Plant Groundwater Discharge Permit GW 1810102," dated May 17, 2023.
INF quoLANA iiii jiciiiGnv POWER' A unit of American Electric Power Ms. Jen Klang District Supervisor Michigan Department of Environment - Great Lakes and Energy Surface Water Quality Division 7953 Adobe Road Kalamazoo, MI 49009-5026 May 17, 2023 Indiana Michigan Power Cook Nuclear Plant One Cook Place Bridgman, Ml 49106 IndianaMichiganPower.com
Reference:
Letter from C. A. Blosser, Indiana Michigan Power Company, to J. Klang, Michigan Department of Environment - Great Lakes and Energy, "Donald C. Cook Nuclear Plant, Groundwater Discharge Permit GW 1810102," dated March 29, 2023.
Subject:
Donald C. Cook Nuclear Plant Groundwater Discharge Permit GW 18 l 0 I 02
Dear Ms. Klang,
By the above reference the Donald C. Cook Nuclear plant (CNP) provided notification of a pH noncompliance that occurred on March 24, 2023. This letter provides the written follow up notification of this event as required by the CNP Groundwater Discharge Permit (GWI8101 02), Part I.I I d), Compliance Requirements. The lower pH limit for Outfall OOD (Turbine Room Sump) was exceeded during a pump-out on March 24, 2023. Approximately 39,000 gallons of pH range 3.5 6.0 was discharged to the on-site absorption pond.
As required by the CNP Groundwater Discharge Permit (GWl810102), Part 1.11.c), the on-line pH meter data recorded a within limit pH value of9.4 on March 24, 2023, at 22:20 hours during the next discharge period.
The following is a summary of an internal evaluation of the cause for the pH lower limit to be exceeded:
The Turbine Room Sump (Outfall 00D) effluent is continuously monitored by an on-line pH meter. Alarms are set for Low pH at 7.0, and High pH at 9.0. When the pH meter alarms, a signal is sent to a valve controller that will send a signal to the discharge valve to shut off the flow. An alarm is also sent to the control rooms, and subsequently the sump recirculation alarm light illuminates at the make-up plant panel.
On March 27, 2023, Turbine Room Sump pH data was downloaded for preparation of the monthly Discharge Monitoring report. It was noted that there was a period of time where the pH of the discharge was below the limit of 6.5, and during the following pump out the pH had returned to 9.4.
Cause investigation showed that both the calibration checks for the pH meter and the alarm function was satisfactory before and after the exceedance.
Interviews with operations personnel concluded the operator failed to verify that the discharge valve indicated closed before leaving the panel.
May 17, 2023 OW Pennit GW1810102 Page2 Follow up samples of downgradient wells were taken and indicate nonnal values.
Date Monitoring point pH Results 4/4/2023 Monitoring Well EW IA 7.06 4/4/2023 Monitoring Well EWI2 7.85 We inspect the on-site absorption pond on a weekly basis and have not observed any environmental impact from this discharge. Based on the dilution of the effluent by a 6 million gallon settling pond, and additional groundwater dilution, there was no impact to the surrounding groundwater from this event. With this notification we have met Part 1.1 la-d of the CNP Groundwater Discharge Pennit (GWI810102) requirements.
The event was communicated to the Site to prevent a reoccurrence. A procedure change was initiated to clarify site and pennit compliance expectations during pH out of pennit compliance situations. Ongoing management observations are in place to detect any nonnalized behaviors that may have affected the event outcome.
If you have any questions, please contact me at (269) 465-5901, ext. 2579.
Christopher A. Blosser Chemistry and Environmental Manager c:
Mr Daniel Burlingame - EGLE Kalamazoo USNRC per app. B TS.
May 17, 2023 OW Permit GW1810102 Page 3 I certify under penalty of law that I have personally examined and am familiar with the information submitted on this and all attached documents, and based on my inquiry of those individuals immediately responsible for obtaining the information, I believe the submitted information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment.
C.A. Blosser Chemistry and Environmental Manager.