AEP-NRC-2023-30, Follow-Up Notification of Ph Non-Compliance for Turbine Room Sump

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 Cook Nuclear Plant One Cook Place MICHIGAN Bridgman, Ml 49106 POWER indianamichiganpower.com An AEP Company B O U N D L E S S ENERGY June 1 , 2023 AEP-NRC-2023-30 10 CFR 50.4 Docket N o s. : 50-315 50-316 U. S . Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D . C . 20555-0001 Donald C. Cook Nuclear Plant Units 1 and 2 FOLLOW UP NOTIFICATION OF PH NON-COMPLIANCE FOR T U R B I N E ROOM S U M P

References:

1. Letter from M . K. Scarpello, Indiana Michigan Power Company, to Document Control Desk, U . S . Nuclear Regulatory C o m m i s s i o n , "Notification of PH Non-Compliance for Turbine Room S u m p , " dated April 1 2 , 2023 ( M L 2 3 1 0 2 A 1 5 1 ) .

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 1 8 1 0 1 0 2 , " dated May 1 7 , 2023.

By Reference 1 , I n d i a n a Michigan Power Company ( l & M ) , the licensee for Donald C. Cook N u cl e a r Plant ( C N P ) Units 1 and 2, provided notification of a pH non-compliance for Outfall 00D (Turbine Room S u m p ) . 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 l i m i t. Follow up samples of downgradient wells were taken and indicated within l i m i t pH values of 7 . 0 6 and 7 . 8 5 . C N P has not observed any environmental impact from this discharge. Corrective actions have been implemented to prevent reoccurrence.

U . S . Nuclear Regulatory Commission AEP-NRC-2023-30 Page 2 This letter contains no new or revised commitments. Should you have any questions please contact Chris A Blosser, Environmental Manager, at (269) 4 6 5 - 5 9 0 1 , 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 1 8 1 0 1 0 2 , " dated May 1 7 , 2023.

KMH/sjh c: EGLE -- RMD/RPS J. B. Giessner - NRC Region Ill NRC Resident Inspector N . Quilco - MPSC R. M. Sistevaris - AEP Ft. Wayne S. P. W a ll - N R C Washington, D . C .

A J . Williamson - A E P Ft. Wayne

E N C L O S U R E 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 1 8 1 0 1 0 2, " dated May 1 7 , 2023.

INF quoLANA Indiana Michigan Power iiii jiciiiGnv Cook Nuclear Plant POWER' One Cook Place Bridgman, Ml 49106 A unit of American Electric Power IndianaMichiganPower.com 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

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 1 8 1 0 1 0 2 , " dated March 29, 2023.

Subject:

Donald C. Cook Nuclear Plant Groundwater Discharge Permit GW 1 8 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 ( G W I 8 1 0 1 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 ( G Wl 8 10 1 0 2 ) , Part 1.11.c), the on-line pH meter data recorded a within limit pH value o f 9. 4 on March 24, 2023, at 22 : 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> 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 1 7 , 2023 OW Pennit G W 1 8 10 10 2 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 E W I 2 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 ( G W I 8 1 0 1 0 2 ) 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 1 7 , 2023 OW Permit G W 1 8 10 10 2 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.