ML20084B442
| ML20084B442 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/12/1972 |
| From: | Hunnicutt D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | James Keppler US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084B161 | List: |
| References | |
| NUDOCS 8304060444 | |
| Download: ML20084B442 (2) | |
See also: IR 05000254/1972010
Text
{{#Wiki_filter:. _.. ___ 9 o .. . . _ e tt' e - s [[ -] , UNITED STATES ~ (,' . I ATOMIC ENERGY COMMISSION 1 . . '* , (" Y{ 3 DIVISION OF COMPLIANCE \\j ,@g , , 3 REGION lli frifn p 799 ROOSCVELT ROAD TELEPHONE GLEN ELLYN, ILLINOIS 60137 (312) ess.zesa June 12, 1972 J. G. Keppler, Chief, Reactor Testing and Operations Branch Directorate of Regulatory Operations, lleadquarters COMMONWEALTil EDISON COMPANY LICENSE NO. DPR-25 QUAD-CITIES UNIT 1 DAMAGE TO A REINFORCED RUBBER EXPANSION JOINT AND FLOODING OF THE LOWER LEVEL OF Tile TURBINE BUILDING The attached inquiry report is forwarded for information. Licensee personnel were performing work on the reverse flow valves on the north end of the north half of the main condenser, when the northeast valve closed. This sudden closure resulted in damage to the reinforced rubber expansion joint and flooding of the lower level of the turbine building to a depth of about 14. 5 fee t . The licensee determined that no radioactivity was released during removal of the untreated water (approximately 600,000 gallons) from this unrestricted area. The flooding resulted in the loss of the 1 and the 1/2 diesel generator cooling water pumps and various other safety related equipment. The reactor had been shut down for scheduled maintenance for approximately nine days prior to this incident. l The licensee will issue a report to the Directorate of Licensing within ten days as required by the technical specifications. 1 1 8304060444 720901 PDR ADOCK 05000254 S PDR t.t' y'l
'. O O " ' . J. G. Keppler '- June 12, 1977 l . This incident will be included in the inspection plan for the next inspection at this facility. l f): hes+mu.W? D. M. liunnicutt, Chief Reactor Testing and Startup Branch i l l Attachment: RO Inquiry Rpt No. 050-254/7'-10 (2 cys) cc: 11. D. Thornburg, RO J. B. llenderson, R0 R. B. Minogue, RS (3) R. S. Boyd, L (2) R. C. DeYoung, L (2) D. J. Skovholt, L (3) 11. R . Denton, L (2) l P. A. Morris, RO R . 11. E nge lke n , RO RO Files DR Central Files .
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .. ' ~ O O - , . U. S. ATOMIC ENERGY COMMISSION DIRECTORATE OF REGUIATORY OPERATIONS REGION IIT l RO Inquiry Report No. 050-254/72-10 l l Subject: Commonwealth Edison Company License No. DPR-2S Quad-Cities Unit 1 Damage to a Reinforced Rubber Expansion Joint and Flooding of the Lower Level of the Turbine Building .M m .~.. P [MS/71 Prepared By: 211 (Da t e) A. Date and Manner AEC was Informed: 1. Telecon, Messrs. F. Palmer and B. Stephenson (Station Superintendent and Assistant Superintendent) to Mr. D. C. Boyd on June < > , 1972. '. TWX, Mr. B. Stephenson to Region III, received June 12, 1972. B. Description of Particular Event or Circumstance: The licensee reported that while performing work on the reverse flow valves on the north end of the north half of the main condenser, the reinforced rubber expansion joint was damaged. This damage resulted in flooding the lower level of the turbine building to a depth of about 14.5 feet with approximately 600,000 gallons of untreated river water. The flooding resulted in loss of the 1 and the 1/2 diesel generators cooling water pumps, two condensate t rans fer pumps , four condensate and condensate booster pumps and miscellaneous other pumps; the seismograph; and various lighting circuits. The reactor had been in a subcritical condition for nine (9) days prior to this incident. The Unit 2 reactor was immediately shut down as only one diesel generator was available for continuous emergency operation. 00 D c [0 3
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_ 2- C. Action by Licensee: The situation was appraised and the licensee determined that no immediate safety problem was involved. Water analyses indicated no radioactivity would be released, if the untreated water was pumped back to the river. Grab samples of the , eater were taken at approximately one hour intervals to determine if radioactivity was present. The continuous monitor in the discharge canal was checked frequently to assure that no radioactivity was discharged to the river. The licensee positioned six portable pumps and pumped the untreated river water to the site discharge canal. When the water level was down to approximately one foot (initially the water level was 14.5 feet) , the water was diverted through the oil separators to assure that no oil (from pump bearings, etc.) was inadvertently discharged into the river. The licensee stated that the affected motors would be dried out and checked subsequent to reinstallation. The equipment would be inspected, tested, and operated to assure that each motor and pump was satisfactorily repaired. Unit I will not be restarted until all equipment has been repaired, tested, and demonstrated as operable. Unit 2 will not be restarted until the 1/2 diesel has been tested to assure adequate operation and that a replacement seismograph, other appropriate means to monitor seismic movement is available, or the installed seismograph is repaired and shown to operate as designed. , l 1 l
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, ., TO: D. C. Loyd [ , ._ _, Reference Quad-Cities Nuclear Power Station Unit 1 DPR-29 Appendix A Section 1.0,A.2.6.6.A.3 and 6.6.B.3 at 5:05 p.m. on Jane 9, 1972. With the Unit I reactor in the shutdown mode, the northeast expansion joint on the condenser circulating water system ruptured. The Unit 1 condensate pump room was flooded. The floowing effected the following major equipment: four Unit I residual heat removal sy' stem service water pumps, the Unit 1-2 diesel generator cooling water pump, condensate transfer pump, and the Unit 1 condensate and condensate booster pump. This equipment was declared inoperable. The Unit 2 reactor was in the startup mode at the time of the incident and was shutdown immediately, s B. Stephenson Quad-Cities Nuclear Power Station rcvd 11:30 a.m. - 6-12-72 - j dg , t __ __.,__ _ _ _ _ _ _ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~ ^ - - - - - - - - - - - - - - - - }}