ML20245D888
| ML20245D888 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/29/1988 |
| From: | Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 88-633, NUDOCS 8810070280 | |
| Download: ML20245D888 (3) | |
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VIROINEA ELEC'IRIC AND POWER COMPANY Rrcnwown,VrmorxrA 20261 September 29, 1988 United States Nucleai Regulatory Commission Serial No.88-633 Attention:
Document Control Desk NAPS /DEQ/deq Washington, D.C.
20555 Docket Nos. 50-338 50-339 License Nos. NPF-4 NPF-7 Gentlemen:
VIRGINIA ELECTRIC Af0 POWER COMPANY-NORTH ANNA POWER STATION UNITS 1 AND 2 KAMAN PROCESS VENT RADIATION MONITOR RI-GW-178 At 1055 hours0.0122 days <br />0.293 hours <br />0.00174 weeks <br />4.014275e-4 months <br /> on September 15, 1988, with Units 1 and 2 at 100 percent power (Mode 1), the Kaman Process Vent Radiation Monitor, RI-GW-178, exceeded the Action Statement of Technical Specification 3.3.3.1.
Since the Action Statement requires that the radiation monitor be returned to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or -initiate the alternate method of monitoring and submit a-Special Report, this event is reportable pursuant to Technical Specification 6.9.2.
The process vent effluent path is continuously monitored by radiation monitor assembly RI-GW-178. On September 12,-1988, during the weekly performance of HP-3.2.1.1, " Sampling of Gaseous Effluents Via Kaman Monitors", Health Physics personnel discovered water in the particulate filters of the gas sampler assembly for RI-GW-178.
The Instrument Department was notified and radiation-monitor RI-GW-178 was removed from service at 1055 hours0.0122 days <br />0.293 hours <br />0.00174 weeks <br />4.014275e-4 months <br /> on September 12, 1988 to check for water in the gas sampler chamber. There was no evidence of water in the gas sampler chamber, but smear results indicated that the check source had started to leach.
Since there was no water present in the gas sampler chamber, water vapor must have initiated the leaching process (a. chemical reaction between the chlorine 36 source and the hydrogen in water vapor).
Leaching of a check source contaminates the gas sampler chamber and increases the activity.
The water in the sample lines was drained.
Although it has not been determined how the water got in the sample lines, it is believed to be a result of condensation.
An evaluation is being performed to determine the best method to dry the sample lines and, corrective actions necessary to prevent recurrence.- This. special report will be updated upon implementation of necessary corrective actions.
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- This event posed no significant safety implications because the Westinghouse Process Vent Radiation Monitors, which perform the same automatic functions as RI-GW-178, remained operable throughout this event. Additionally, the Nuclear Research Corporation. Radiation Monitors. continued to operate throughout this event as' the Technical Specification required preplanned alternate monitoring.
method on the process vent release' path.
Very truly yours, GWY lV W. R. Cartwright U
Vice President - Nuclear cc:
'U. S. Nuclear Regulatory Commission 101 Marietta Street, N.W.
Suite 2900 Atlanta, GA 30323 Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station
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Fp KAMAN RADIATION MONITOR RI-GW-178 EXCEEDED T.S. ACTION STATEMENT ON SEPTEMBER 15. 1988 f,
I.
VERIFICATION OF ACCURACY 1.
Deviation Report 88-771 2.
HP-3.2.1.1 3.
Action Statement for RI-GW-178 entered at 1055 hrs. on 9/12/88.
.II.
ACTION PLAN 1.
Technical Services -should be assigned to evaluate the water condensation problems with RI-GW-178, and develop recommendations to prevent recurrence.
Instrument and HP Department concurrence on these recommendations should be obtained.
A due date of 11/01/88-should~ be reasonable.
- 2. ' Technical Services should be assigned to present the recommendations to prevent recurrence and an action plan for implementation of these recommendations to Station Management for approval.
A due date of 11/10/88 should be reasor,able.
3.
As directed by Station management, additional-CTS items will be generated to ensure implementation of-the necessary recommendations.
4..
Diane' Quarz should be assigned to update this special report upon implementation of the necessary recommendations.
An initial due date of 01/31/89 should be adequate.-
5.
The Electric Department should be assigned to ensure a' check of the heat trace on all the Kaman Radiation Monitors is performed monthly.
A due date of November ' 30, 1988 should be adequate.
(Due date suggested per interface with Greg Gordon).
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