ML20087E091
| ML20087E091 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/12/1984 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20087E063 | List: |
| References | |
| 5211-84-2036, NUDOCS 8403160022 | |
| Download: ML20087E091 (3) | |
Text
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T' y n
GPU Nuclear Corporation
,J'-] g Qg@$7 Post Office Box 480
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Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Olal Number:
March 1,2, 1984 5211-84-2036 Office of Nuclear Reactor Regulations Attn: John F. Stulz, Chief Ope.ating 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.
- ukill, Director, TMI-1 HDH:CWS:mle
~
Attacncent cc:
H. Silver 9403160022 940312' PDR ADOCK 05000299 P
PDR GPU Nuclear Corporation is a subsidiary of the General Public Utilities Ccrporation
SUMMAR1* OF CONDEMSOR OFF. GAS RADIATION MONITORS RESPONSES AS THEY RELATE TO OTSG LEAKAGE RMA-5 (Low Channel)
High Alarm Set Point:
2.5E5 cpm
- Basis:
A primary to secondary 19ak rate of 7 gph (0.12gpm) at a nominal failed fuel fraction of 0.03% will 1 dicate 2.5E5 cpm.
This high alarm set point also 7
corresponds to the GPUNC'3 ministrative shutdown limit of 7 gph primary to d
secondary leakage.
Alert Alarm Set Point:
115 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.
RMA-5 (High Channel)
High 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 f ailed 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 site boundary.
Alert Alarm Set Point:
130 cpm
- Basis:
An Unusual Event is declared at 1 spm primary to secondary leak rate which corresponds to 130 cpm on RMA-5 High based on a nominal failed fuel fraction of 0.03%.
The 1 gpm is the Tech. Spec shutdown limit.
RMG-25 High Alarm Set Point: 5.5E3 mR/hr
- Basis:
A Site emergency classification is declared at 5.5F3 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. '
l RMG-25 (Continuad)
Ilert Alarm Set Point:
1.lE3 mR/hr
- Basis:
An Alert emergency classification ** is declared at 1.1E3 mR/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 boundary.
f These values may change slightly due to instrument response characteristic'.
s An Alert emergency classification is also declared for greater than 50 gpm Primary to secondary leakrate when saturation margin is not lost regardless of radiation monitor reading.
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