TMI-12-044, Special Report - Radioactive Gaseous Process and Effluent Monitoring Instrumentation
| ML12094A306 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/30/2012 |
| From: | Libra R Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| TMI-12-044 | |
| Download: ML12094A306 (2) | |
Text
Exelokn Nuclear March 30, 2012 TMI-12-044 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Three Mile Island Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-50 NRC Docket No. 50-289
Subject:
Special Report - Radioactive Gaseous Process and Effluent Monitoring Instrumentation This Special Report is being submitted pursuant to the requirements of Three Mile Island Nuclear Generating Station, Unit 1, Off-site Dose Calculation Manual (ODCM) Table 2.1-2 Action 30. Action 30 states the following:
ACTION 30
- 1. With the number of channels OPERABLE less than required by the Minimum Channels OPERABLE requirement, a grab sample shall be collected and analyzed for the inoperable gas channel(s) at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. With both channels inoperable, a grab sample shall be collected and analyzed for the inoperable gas channel(s):
(a) at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during degassing operations.
(b) at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during other operations (e.g.
Feed and Bleed).
- 2. If the inoperable gas channel(s) is not restored to service within 14 days, a special report shall be submitted to the Regional Administrator of the NRC Region I Office and a copy to the Director, Office of Inspection and Enforcement within 30 days of declaring the channel(s) inoperable. The report shall describe (a) the cause of the monitor inoperability, (b) action being taken to restore the instrument to service, and (c) action to be taken to prevent recurrence.
On March 7 th, 2012 at 08:38, the B train Waste Gas Hydrogen and Oxygen Monitor was removed from service for calibration per surveillance 1303-4.22B. During calibration, the High Hydrogen alarm set point was determined to be out of tolerance at 1.9% versus the required range of 1.3 to 1.7% as documented in TMI Issue Report 1337596.
TM1-12-044 Special Report -
Radioactive Gaseous Process and Effluent Monitoring Instrumentation Adjustments of the alarm setpoint were unsuccessful. The apparent cause for the failure is the dual optical alarm meter. The lead time for this component exceeds the 14 day requirement of ACTION 30.
On 3/20/12, remaining portions of the calibration were completed and the monitor was returned to service with the open deficiency for the High Hydrogen alarm function.
Compensatory sampling is ongoing in accordance with ACTION 30.
The B train Waste Gas Hydrogen and Oxygen Monitor is expected to be returned to a fully operable status by 4/29/12.
The corrective action system is tracking actions to ensure that parts are available in the future to prevent recurrence.
There are no regulatory commitments contained in this letter.
If you have any questions, please contact Dave Atherholt at (717) 948-8364.
Respectfully, R. W. Libra i\\
M Site Vice Pr i
, Three Mile Island Unit 1 Exelon Generation Co., LLC cc: USNRC, Regional Administrator, Region I USNRC, Senior Resident Inspector, TMI Unit 1 USNRC, Director, Office of Inspection & Enforcement