ML20150D978

Special Rept 88-02:on 880613,approx 13,000 Gallons of NaOC1, 12.45 Ph Spilled at Cooling Water Chemical Control Sys Bldg. on 880617,second Spill Occurred.Caused by Open Drain Valve. PVC Piping to Be Replaced W/Stronger Piping

ML20150D978
Person / Time
Site:	Callaway
Issue date:	07/08/1988
From:	Blosser J UNION ELECTRIC CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-02, 88-2, ULNRC-1800, NUDOCS 8807140260
Download: ML20150D978 (5)

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UNION

$LECTRIC 1 as Callaway Plant July 8, 1988 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 ULNRC-1800 Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 88-02 SODIUM HYPOCHLORITE SPILLS The enclosed Special Report is submitted pursuant to the Environmental Protection Plan concerning two incidents in which sodium hypochlorite was spilled.

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J. D. Blosser Manager, Callaway Plant LAM:jlh Enclosure cc: Distribution attached i

8807140260 88070s DR. ADOCK 050004s3 /'

PDC j , g Madrig Actiress P.O. Box 620, Fdton MO 6S251 l

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. '. cc distribution for ULNRC-1800 l

Mr.lA. Bert Davis Mr. Thomas Alexion (2 copies)

Regional Administrator Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission' U. S. Nuclear-Regulctory Commission Region III Mail Stop 13-E-21; 799 Roosevelt Road' Washington, D.C. 20555 Glen Ellyn, IL' 60137 American Nuclear Insurers Mr. O. Maynard c/o Dottie Sherman,~ Library Wolf Creek. Nuclear Operating Corp.

The Exchange Suite 245 P. 0. Box 411 270 Varmington Avenue ~ Burlington, KS' 66839-Farmington, CT 06032 Mr. Merlin Williams Manager, Electric Department Supt._of Regulatory Quality &'

Missouri Public Service Commission Administrative Services P. O. Box 360 Wolf Creek Nuclear Operating Corp. j Jefferson City, MO 65102- P. O. Box 411 Burlington, KS 66839 Records Center Institute of Nuclear Power Operations Mr. R. W. DeFayette Suite 1500 Chief, Project Section 3A 1100 circle 75 Parkway U.S. Nuclear Regulatory Commission -l Atlanta, GA 30339 Region III 799 Roosevelt Road NRC Resident Inspector Glen Ellyn, IL 60137 ,

l D. F. Schnell (400) )

G. L. Randolph l W. R. Campbell R. P. Wendling (470) l A. P. Neuhalfen l

A. C. Passwater/D. E. Shafer/D. J. Walker (470) l G. A. Hughes 1 Z170.05 (QA Record)

Z40SR (Z170.09 Commercial Record)

M. S. Evans M. E. Taylor H. Wuertenbaecher, Jr. (100)

S. L. Auston (470)(NSRB)

S. J. Bellers/J. D. Schnack JDB Chrono 3456-0021.6 3456-0260 Z40ULNRC A160.761 N. Date (Sandra Auston) (470)

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SPECIAL REPORT 88-02 S_0DIUM HYPOCHLORITE SPILLS Two sodium hypochlorite (Na0Cl) spills occurred at'the Cr 1.away site. The first event occurred on June 13, 1988 at 1654 CDT with the plant in Mode 1-Power' Operations at 100 percent reactor power when approximately'13,000 gallons of one percent Na0C1, 12.45pH spilled. The second event occurred on June 17, 1988 at 1500 CDT with the plant also in Mode 1 - Power Operations at 100 percent reactor power when approximately 12,000-gallons of one percent Na001, 12.2pH spilled.

DESCRIPTION Event 1:

At 1654 CDT on June 13, 1988, the Control Room was notified of a Na001 spill at the Cooling Water Chemical Control System (CWCCS) building. The outside Equipment Operator (E0) was opening the 'A' Na001 tank isolation valve, VDD1040A, when the flange on the tank side of the valve broke open. The flange and the piping in this system are made of PVC plastic. The break was due to fatigue failure at the flange connection caused by a high stress concentration around a portion of the flange lip.

Na0C1 spilled on the hft side of the E0's body and sprayed into his hair.

The Medical Emergency Response Team (MERT) was called to assist the E0. No injuries resulted.

The Na0C1 leak could not be isolated, therefore the contents of the 'A' Na001 tank, approximately 13,000 gallons, were spilled into the CWCCS building.

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The sumps in the building became full and._the excess Na001 ran out of the building to the ground outside, across the access road and into a drainage ditch. Approximately 100 square yards of the outside area was saturated.

Na0Cl saturated into the ground or was recovered. The Na0C1 did not affect any water system and no one was injured.

Event 2:

At 1500 CDT on June 17, 1988, the Control Room was notified of the second Na0C1 spill in the CWCCS building. Na0C1 Tank 'A' drain valve (VDD1076A) was inadvertently left open when clearing a Workman's Protection Assurance (WPA) tag following repair of the flanga dc.scriled in Event 1. Tank 'A' was initially empty, while Tanks 'B' and 'C' were filled. All three tanks are linked through a common header that balances the Na0C1 level in each tank. i When the WPA tag was cleared from Tank 'A', Tanks 'B' and 'C' drained to Tank

'A' in order to equalize the levels in all three tanks. Because the drain '

valve on Tank 'A' was open, a total of 25,000 gallons of Na0C1 was released from the system, the total arount from Tanks 'B' and 'C'. Approximately 12,000 gallons spilled to an outside area of 100 square yards while the remaining amount went to the cooling tower basin via'the building's sump pumps. All of the amount spilled on the ground was contained within the ditch and did not affect any water system. No one was injured.

IMMEDIATE ACTIONS TAKEN.

Event 1:

An earthen dam was built in the drainage' ditch to contain the spilled Na0C1.

The Na0Cl in the ditch soaked into the soil. The. pipe section from the 'A' tank to the isolation valve was replaced.

The cooling tower blowdown to the river was isolated and the sump; pumps to the Cooling Tower Basin were secured. The remaining Na0Cl was pumped to the Cooling Tower Basin while;the blowdown was isolated.. After sampling / analysis was performed for chlorine in the. Cooling Tower Basin, the cooling tower blowdown was re-initiated since the amount of chlorine contained in the basin was in its specification.

The Missouri Department of Natural Resources inspected the spill on June 14, 1988 and found no significant concerns.

Immediately after the incident, the E0 used the emergency shower to rinse off the Na0C1 that was spilled on him. Na0Cl did not injure his eyes as he was wearing glasses which blocked the spray. The E0 was then checked by the MERT and found to have no injuries. He was taken to the Service Building to take.

a chower and change clothes, he then returned to work.

APA-ZZ-00811, Spill Prevention Control and Countermeasure Plan, was utilized by the operators to inform the appropriate personnel. This event was reported to the Nuclear Regulatory (NRC) as a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> reportable event under the Environmental Protection Plan. . The spill was also reported to the Nstional Response Center and the Missouri Emergency Response Office by. Union Electric's Emergency Response Coordinator.

Event 2 The earthen dam that was built for Event I was also used to contain the Na0Cl spill for Event 2. The Na0Cl Tank 'A' drain valve wac closed.

The cooling tower blowdown was isolated until the sampling / analysis for chlorine was performed and found to be satisfactory. This event was reported to the NRC as a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> reportable event under the Environmental Protection Plan. The spill was also reported to the National Response Center and the Missouri Emergency Response Office by Union Electric's Emergency Response Coordinator.

ACTIONS TAKEN TO PREVENT RECURRENCE Event 1 The Na0Cl lines from Tank 'B' and Tank 'C' were inspected and no cracking at the flange connections was observed. A change modification package is being evaluated to replace the present exposed PVC piping with a stronger more reliable pipe.

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4 Event 2 Progressive discipline was initiated with the equipment operator involved in the incident. A letter was issued to all Shift Supervisors to discuss attention to detail with crews when clearing k'orkman's Protection Assurance tags.

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