ML20039E011
| ML20039E011 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/21/1981 |
| From: | Mroczka E NORTHEAST UTILITIES |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| MP-1-1969, NUDOCS 8201060429 | |
| Download: ML20039E011 (2) | |
Text
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500RTHEAST UTII.ITIES f;[j{${$[5552.5
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December 21, 1981 MP-1-1969 Mr. Ronald C. Haynes g
e Regional Administrator of Region I O@\\
q Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission W
631 Park Avenue S'
King of Prussia, Pennsylvania 19406 JAN 51992 > c 1 9
Reference:
Facility Operating License No. DPR-21 c
g Docket No. 50-245 N
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Dear Mr. Haynes:
Attached is an information letter regarding the discovery of steam tunnel ventilation radiation monitors A and B setpoints above specification during Steam Tunnel Ventilation Radiation Monitors Functional Test perform-ed on November 16, 1981.
Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY Mt Zu/
E.
. Mroczka Station Superintendent Millstone Nuclear Power Station EJM/TST:mo
Attachment:
High Steam Tunnel Ventilation Radiation Monitors Setpoints cc: Director, Office of Inspection and Enforcement, Washington, D.C. (30) l Director, Office of Management Information and Program Control, Washington, D.C. (3)
U.S. Nuclear Regulatory Commission, c/o Document Management Branch, Washington, D.C.
20555 8201060429 ei1221 PDR ADOCK 05000 p'SL S
/
ATTACHMENT NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION
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PROVISIONAL LICENSE NUMBER DPR-21 DOCKET NUMBER 50-245 On November 16,1981, at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, while performing Steam' Tunnel Ventilation Radiation Monitors Functional Test, the setpoints for the steam tunnel ventilation radiation monitors A and B were found to be 40 mR/hr and 20 mR/hr respectively. The proposed Technical Specification limit is 17 mR/hr.
The failure of these monitors to trip at their desired setpoints was attributable to setpoint drift.
The steam tunnel ventilation monitors are one set of three provided to initiate isolation of the reactor building ventilation and operation of
- the standby gas treatment system.
This monitoring system limits the amount of radioactive material which could be discharged to the atmosphere during normal operations.
Even -though both steam tunnel radiation monitors did not fall within the proposed Technical Specification limit, an additional monitor located on the main stack indicates and alarms if the instantaneous release rate limit has been approached or exceeded.
The steam tunnel radiation monitors were recalibrated and tested satis-factorily. Replacement of the moritors is under evaluation.
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