ML20002D155
| ML20002D155 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/06/1966 |
| From: | Haueter R, Wall H CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Boyd R, Doan R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8101190561 | |
| Download: ML20002D155 (5) | |
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- A'ca Code 517 7HR OSSO September 6, 1966 Dr. R. L. Dcan, Director Re:
Docket 50-155 Division of Reactor Licensin8 rile Cory United States Atomic Energy Commission Washington, D. C.
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Dear Dr. Doan:
Attention:
Mr. Reger S. Boyd Transmitted herewith are three (3) executed and nineteen (19) conformed copies of a request fcr a change to the Technical Specifications of License DPR-6, Docket lio. 50-155, issued to Consumers Power Cc=peny on 1/ay 1,1964, for the Big Rock Point li.1 clear Plant.
This proposed change (Ho. 11) vill allow the use of ion chambers to replace the scintillation detectors in the off-gas monitoring system.
Since permanent installation of this system is desired during the refueling outage in late September, we vould appreciate your consideration of this request by October 1,1966.
Ycurs very truly, v
RLH/KS/vl Robert L. Haueter Enc Assictant Electric Production Superintendent - Huclear 4 73-e' i
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D REQUEST FOR AUTHORIZATION OF k
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LICENSE NO. DPR-6 4
s Docket No. 50-155(W) fils Cory c3 c
For the reasons hereinafter set forth, it is requested that the Technical Specifications Appended to Operating License No. DPR-6, issued to Consumers Power Company on May 1, 1964, for the Big Rock Point Nuclear Plant, be changed as follows:
In Section 6.4.1, Process Radiation Monitoring Syste=s, replace Paragraph 6.4.1(a) with the following:
"6.4.l(a) Air Ejector Off-Gas Monitoring System Continuous monitoring of the air ejector off-gas radioactivity shall be provided by either two ion chamber type systems or two single-channel gamma scintillation spectrometer systems designed to detect noble gas fission products indicative of a fuel element rupture. One system (either ion chamber or scintillation detector) will always be in service with an identical system as an operational spare. The sampling system shall be designed to hold up the gas sample to allow time for the decay of Nitrogen-16 and other short-lived activation gases. The off-gas monitoring channels shall be calibrated so that the indicated and recorded count rate output of the channel in service, combined with the off-gas flow, permit determination of the fission gases discharge rate from 10 to 10 curies per second at the stack. A trip circuit in the air ejector off-gas monitor shall have an alarm which shall annunciate in the control room. The air ejector off-Eas monitor trip circuit shall also initiate action of a time-delay svitel., which in turn shall trip the off-gas shutoff valve closed after a preselected delay adjust-able up to 15 minutes.
(Off-gas average holdup time is about 30 minutes.) Alarm and trip settings shall te as specified in Section 6.4.3(a)."
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Introduction
- Continuous monitoring of the air: ejector off-gas ' radioactivity
-is provided to measure noble and activation gas release ' rates.
The range specified in.the Technical Specifications for these
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monitoring systems is 10 to 30. curies per 'second. Extra-b 1
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polation of release rates experienced'to date indicates that the actual range of the off-gas monitoring system will be '
. a factor of approximately 100 below the specified maximum.
Several modifications of sample detector chamber geometry have been made to reduce sensitivity of the instrwments to the actual operating range. An additional operational problem with the off-gas monitoring system has been the condensation of moisture in the sampling system which occasionally causes erratic operation of the monitors.
Description cf Changes The proposed modification' to the off-gas acnitoring system
-vould consist _of a change from the present scintillation detection system to an ion' chamber system.
Ion chambers for the two_ reparate off-gas monitoring channels would be attached to a sample chamber consisting of a vertical'sec-tion of 4-inch diameter pipe.
The current output of the ion chambers would be fed to separate-six decade 1cgarithmic current amplifiers which in turn would feed appropriate indicators and recorders. No changes would be made in the alarm or.off-gas isolation valve trip features except that appropriate viring would be installed to initiate from this new system.
The above described ~off-gas' monitoring system using the ion chamber detection principle has been in service for eleven
- months on a trial-basis and has demonstrated excellent reliability.and sensitivity characteristics through release rates fran 10 pc/sec. to.70,000 pc/sec.
Similar systems have been operated at the Vallecitos Boiling i;
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Water Reactor and Humboldt Bay Power Plant for considerable periods of-time and wide ranges of off-gas release rates.
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e The calibration of the' off-gas monitoring. system vill continue to be based on the ' analysis of periodic (at' least monthly) grab samples using the multichannel gamma scintillation spectrometer system-in the_ counting room.
Hazards Considerations The proposed change to allow use of an ion cha=ber type detector in the air ejector off-gas monitoring system is essentially ~a different method of: accomplishing the moni-toring of radioactive gases. This' system eliminates the Jscanning_' single channel spectrometer feature. Operating experience has shown that the present scintillation system is only suitable for use as an integral gross gamma detec-tion' system. These changes are proposed to: 1) assure
-that the specified ranges of gaseous radioactivity can be monitored, and 2) increase the reliability of the systems.
In our opinion, the proposed change does not involve an unreviewed or significant change in the hazards considera-tions described or implicit in the Final Hazards Summary Report.
CONSUMERS POWER CO' AhT By Vice President Date : September 6, 1966 Sworn and subscribed to befor e this 6th day of September 1966.
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" Notary Public, Jackson County, Michigan My commission expires February 2k,1969 lf 4
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