ML20038B796

LER 81-020/04T-0:on 810604,discovered No Flow Through Rad Monitor R-19 from Any of Four Steam Generators.Caused by Buildup of Crud at roto-meter Flow Regulator.Crud Dislodged & Flow re-established

ML20038B796
Person / Time
Site:	Cook
Issue date:	06/18/1981
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20038B790	List: ML20038B789 ML20038B796
References
LER-81-020-04T, LER-81-20-4T, NUDOCS 8112090109
Download: ML20038B796 (2)

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. EVENT DESCRIPTION AND PROB ABLE CONSEOJENCES h I

e 1:1 IDURING NORMAL OPERATION. THE STEAM GENERATOR BLOWDOWN STARTUP FLASH TANK WAS IN 313j ISERVICE TO REDUCE SECONDARY SYSTEM CHEMICAL CONTAMINATION FROM CONDENSER INLEAKAGE. I l

e14i l0N JUNE 4 IT WAS DISCOVERED THAT THERE WAS NO FLOW THRU RAD MONITOR R-19 FROM ANY 3 i s i 10F THE FOUR STEAM GENERATORS. THIS IS NON-CONSERVATIVE IN RESPECT TO APPENDIX "B" I oI6I IT.S. 2.4.2.G. THIS UNIT IS EXPERIENCING A SMALL PRIMARY TO SECONDARY LEAK. THE I al-l l TOTAL POSSIBLE TIME FOR THE UNMONITORED RELEASE WAS 35 MINUTES. PREVIOUS OCCURRENCE I o ie i 10F A SIMILAR NATURE INCLUDES 050-316/81-04 _l 8

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T: i ITHE LOSS OF FLOW FROM R-19 FR0" ALL FOUR STEAM GENERATORS WAS DUE TO A BUILD UP OF CYCLING 0F THE FLC TO THE MAYIMUM i iisl l CRUD AT THE ROTO-METER FLOW REGULATOR.

DESIGN CH GE RFC 12-1825 WAS WRITTEN 1 IT 1 IDISLODGED THE CRUD AND FLOW WAS RE-ESTABLISHED.

l i,13i ITO PROVIDE TO CONTROL ROOM ANNUNCIATION DURING LOSS OF FLO. THE ATTACHED 1 l

1 14 1 ISUPPLEMENT EXPLAINS THE EVENT IN DETAIL.

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• SUPPLEMENT TO R0 50-316/81-020/04T-0 During normal operation the steam generator startup blowdown flash tank was in service to reduce secondary system chemical contamination. Flow through radiation monitor R-19 had been previously verified. Routine technician surveillance at 1415 hrs noted the absence of flow. By rapidly cycling the valves full open and shut,the lines were blown out and flow reestablished imediately. Leaving the area to notify control room of the situation would have resulted in a longer time period of unmonitored release. Blowdown had been on the startup flash tank since

~ - 1340 hrs. The maximum time the unmonitored release could have existed was 35 minutes.

Daily analysis to monitor the primary to secondary leak on Unit 2 had been completed and all parameters were within limits for release via the startup flash tank. A grab sample at the blowdown flash tank was taken at 1415 hrs and analyzed and showed secondary system activities had not significantly changed since the previous analysis.

Time Sample Tritium (uti/cc) Gross e-y(uCi/cc) Iodine-131(uCi/cc) 0015 #21 S/G 2.52 x 10-6 4.38 x 10-5 6.43 x 10-7 0015 #22 S/G 2.74 x 10-6 1.67 x 10-5 2.89 x 10-7 0015 #23 S/G 3.58 x 10-6 1.54 x 10-5 N.D.

l 0015 #24 S/G 2.42 x 10-6 1.06 x 10-5 2.75 x 10-7 1415 2-DSX-350 5.21 x 10-6 4.46 x 10-6 5.81 x 10-7 (flash tank composite)

Using the 1415 steam generator blowdown flash tank composite analysis of the following releases were calculated:

Release Rate Total Release Tri tium 2.48 x 10-9uCi/cc/sec 2.29 x 10-11 Ci/sec 4.81 x 10-8 Ci Gross B-y 2.12 x 10-9 Ci/cc/sec 1.96 x 10-11 Ci/sec 4.11 x 10-8 Ci Iodine-131 2.77x10-lbuCi/cc/sec 2.55 x 10-12 Ci/sec 5.36 x 10-9 Ci A design change, RFC-12-1825, is currently being engineered which will provide an immediate loss of flow warning to the Operations control room, whenever flow to R-19 is interrupted.

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