ML20072C351

RO 50-321/1983-001:on 830213,during Shutdown for Refueling, Approx 3,000 Gallons of 21% Glycol Spilled on Floor of Offgas Bldg.Caused by Oversight on Clearance of Offgas Cooler Condenser Relief Valve.Personnel Instructed

ML20072C351
Person / Time
Site:	Hatch
Issue date:	02/23/1983
From:	Nix H GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
GM-83-180, RO-50-321-1983, NUDOCS 8303080404
Download: ML20072C351 (2)

Text

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• • '.* Georgia Power Company wJ- Post Offk:e Box 439 Baxley, Georgia 31513 Telephone 912 367 7781 912 537-9444 m

s Georgia Power s Edwin 1. Hatch Nuclear Plant ca ~,

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PLANT E. I. HATCH Special Report Docket No. 50-321 -

United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II, Suite 3100 101 Marietta Street Atlanta, Georgia 30303 Attention: Mr. James P. O'Reilly Pursuant to section 5.7.2 of Hatch Environmental Technical Specifications, please find attached Special Report No.

50-321/1983-001.

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wH. C. Nix General Manager HCN/SBT/abb xc: R. J. Kelly G. F. Head J. T. Beckham, Jr.

P. D. Rice K. M. Gillespie S. B. Tipps R. D. Baker Control Room Document Control ,,

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B303080404 e30223 PDR ADOCK 05000321 PDR S

r-s NARRATIVE FOR SPECIAL REPORT 50-321/1983-001 On February 13, 1983, with Unit 1 shutdown for refueling, approximately 3000 gallons of 21% glycol spilled onto the floor of the offgas building. The glycol was subsequently mixed with approximately 47,000 gallons of water in radwaste.

After notification to and approval of the state Environmental Protection Division, this mixture was discharged to the river in five separate batches on February 13 and February 14. The glycol mixture was further diluted with water in each discharge batch. The discharge batches had an average glycol mixture flowrate of 74.8 gallons per minute and an average dilution flowrate (water) of 12,100 gallons per minute. This event is contrary to Environmental Tech. Specs. section 4.2. Plant operation was not affected. The health and safety of the public were not affected by this non-repetitive event.

The cause of this event has been. attributed to an_ oversight on a clearance of an offgas cooler condenser relief valve. On February 8, a clearance request submitted by maintenance to operations to isolate several valves on the offgas side of the "B" offgas cooler condenser failed to properly isolate the "B" relief valve. A continuation line (on the offgas system piping and instrument drawing) that connected the "B" relief valve with the tube side (glycol side) of the condenser was overlooked.

This oversight caused personnel ~to believe that the "B" relief valve came off of the shell side (offgas side of the condenser. )

When maintenance physically checked the clearance, the "B" relief valve appeared to be isolated. This appearance of isolation existed because the glycol suction and discharge valves to the condenser were closed (but not isolated correctly) at this time.

The relief valve was removed from the system to be worked on.

On February 12, a clearance was requested on the "A" valve.

On February 13, the control room switched from the "A" loop pump to the "B" loop pump, and thus opened the "B" loop glycol suction and discharge valves for the offgas cooler condenser.

Since the "B" loop was open because the relief valve was out of the system, glycol spilled onto the floor. Affected site personnel have been reminded of the importance of carefully checking valve clearances.