PY-CEI-NRR-1857, Special Rept:On 940825,offgas Ventilation Exhaust Post Accident RM Declared Inoperable & Exceeded 72 H Limit on 940828 When New Flow Control Circuit Card Would Not Calibr Properly.Original Circuit Card Reinstalled & Calibr

Special Rept:On 940825,offgas Ventilation Exhaust Post Accident RM Declared Inoperable & Exceeded 72 H Limit on 940828 When New Flow Control Circuit Card Would Not Calibr Properly.Original Circuit Card Reinstalled & Calibr

ML20072U474
Person / Time
Site:	Perry
Issue date:	09/08/1994
From:	Stratman R CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
PY-CEI-NRR-1857, NUDOCS 9409160270
Download: ML20072U474 (2)

Text

. . .

l ' GNTERDOD l

ENERGY l

l PERRY NUCLEAR POWER PLANT Mail Address:

i PO. BOX 97 MM A. Mahan 10 CENTER ROAD PEREY, OHIO 44081 VICE PRESIDENT NUCLEAR PERRY, OHIO 44081 (216) 259-3737 September 8,1994 PY-CEI/NRR-1857L i U.S. Nuclear Regulatory Commission Document Control Room Washington, D.C. 20555 Perry Nuclear Power Plant Docket No. 50-440 Inoperable Accident Monitoring Instrumentation - Special Report Gentlemen:

Attached is a Special Report concerning inoperable Accident Monitoring Instrumentation. This report satisfies the requirements of Perry Technical Spr.cifications 3.3.7.5 and 6.9.2.

If you have questions or require additional information, please contact Mr. James D. Kloosterman, Manager - Regulatory Affairs, at (216) 280-5833.

Very truly yours, C -, / ,

l </n /z RAS:DHL:sc cc: NRC Project Manager NRC Resident Inspector Office l NRC Region III 1

133072 j Operating Companies l Cleveiond Electnc illummating Toledo Edison g 9409160270 940908 /

PDR ADOCK 05000440 '& '

S PDR I

PY-CEI/NRR 1857L Attachment 1

'. Page 1 of 1 On August 25, 1994, at 1120, the Offgas Ventilation Exhaust Post Accident Radiation Monitor was declared inoperable for performance of preventative maintenance and calibration, as required by Technical Specifications.

Technical Specification 3.3.7.5 requires submittal of a Special Report within 14 days if the radiation monitor is not restored to operable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit was exceeded on August 28, 1994 at.1120. In accordance with Technical Specification Action 81, pre-planned alternate monitoring methods l vere initiated. All aspects of Technical Specifications were met. l l

The Offgas Ventilation Exhaust Post Accident Radiation Honitor monitors the l Offgas ventilation exhaust effluent airborne radiation during accident  ;

conditions. The sample is drawn from the normal range atmosphere radiation monitor isokinetic sampler. The sample passes through one of three particulate / iodine channels and then through a sample pump and a gas sample chamber. The gas sample chamber has two detectors, one each for intermediate and high range airborne radiation levels. Signals from the sample panel are sent to a microcomputer for processing. The signals provide indication to the control module in the Unit 1 Control Room. i The preventative maintenance being performed was replacement of a flow control circuit card in the sampler panel. Following replacement on August 26, 1994, the new circuit card would not calibrate properly. The work was postponed until August 29, 1994, causing the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit to be exceeded. A condition report has been initiated to investigate the circumstances which resulted in postponing the work.

Further troubleshooting showed that the replacement flow control card was faulty. With no other replacement flow control cards available it was decided to reinstall and calibrate the original circuit card. Following installation, the original card operated intermittently. Troubleshooting determined the signa) was being grounded through the circuit card mounting screws. The original mounting screws were specified as nylon on the bill of material, but vere found to be steel. Nylon screws have been ordered with a scheduled delivery date to support returning the Offgas Ventilation Exhaust Radiation Monitor to operable on September 12, 1994. l l

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