ML20087E098
| ML20087E098 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/12/1984 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 5211-84-2036, NUDOCS 8403160024 | |
| Download: ML20087E098 (3) | |
Text
V GPU Nuclear Corporation
' ; Nuclear gjem:r8o o
Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84-2386 Writer's Direct Dia! Number:
March 1.2, 1984 5211-84-2036 Office of Nuclear Reactor Regulations Atto: John F. Stolz, Chief Operating Reactors Branch No. 4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555
Dear Sir:
Three Mile Nuclear Station, Unit I (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Radiation Monitor Setpoints Attached for your information is a copy of a letter to the PaDER concerning the setpoints for RMA5 and RM-G25.
Sincerely, H. D.
- lukill, Director, TMI-1 IIDH:CWS:mle Attachraent cc:
- 11. Silver l
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'{l GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
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SUMMARY
OF CONDENSOR OFF GAS RADIATION MONITORS RESPONSES AS THEY RELATE TO OTSG LEAKAGE RNA-5 (Low Channel) liigh Alarm Set Point:
2.5E5 cpm
- Basis:
A primary to secondary leak rate of 7 gph (0.12gpm) at a nominal failed fuel fraction of 0.03% will indicate 2.5E5 cpm.
This high alarm set point also corresponds to the GPUNC administrative shutdown limit of 7 gph primary to secondary leakage.
Alert Alarm Set Point:
IES cpm
- Basis:
A primary to secondary leak rate of 3 gph (0.05 gpm) at nominal failed fuel fraction of 0.03% will indicate 1 x 10 cpm on RMA-5 low range.
This alarm is set at a value higher than the baseline leak rate, approximately 50% of the administrative shutdown limit.
R'IA-5 (Iligh Channel) liigh Alarm Set Point:
3E4 cpm
- Basis:
An Alert emergency classification ** is declared at 3E4 cpm on RMA-5 High which corresponds to 10 mR/hr dose rate at the site boundary assuming a nominal failed fuel f raction of 0.03% and adverse meterology.
A 250 gpm primary to secondary leak rate at a nominal failed fuel fraction of 0.03% is actually required to reach a dose rate of 10 mR/hr at site boundary.
Alert Alarm Set Point:
130 cpm
- Basis:
An Unusual Event is declared at 1 gpm primary to secondary leak rate which corresponds to 130 cpm on RMA-5 Iligh based on a nominal failed fuel f raction of 0.03%.
The 1 gpm is the Tech. Spec. shutdown limit.
RMG-25 liigh Alarm Set Point:
5.5E3 mR/hr
- Basis:
A Site emergency classification is declared at 5.5E3 mR/hr on RMG-25, which corresponds to 50 mR/hr dose rate at the site boundary assuming a nominal failed fuel fraction of 0.03% and adverse meterology.
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RMG-25 ' (Continued)
' l Alert Alarm Set Point:
1.IE3 mR/hr
- Basis:
An Alert emergency. classification ** is declared at 1.?E3 nR/hr on RMG-25, which corresponds to 10 mR/hr dose rate at:the site boundary assuming a. nominal failed fuel fraction of 0.03% and adverse meterology. A 250 gpm primary to secondary leak rate at a nominal failed fuel fraction.of 0.03% is actually required to
. reach a dose rate of 10 mR/hr at the site boundar'.
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These values may change slightly.due to instrument response characteristics.
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- An Alert emergency classification is also declared for greater.than 50~gpm j-primary to secondary-leakrate when saturation margin is not lost regardless of radiation monitor reading.
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