ML19254D750
| ML19254D750 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 10/09/1979 |
| From: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910300059 | |
| Download: ML19254D750 (7) | |
Text
YK CONNECTICUT YANKEE ATOMIC POWER COMPANY BERLIN, CO N N EC TIC U T P O. BOX 270 H ARTFORD. CONN ECTICUT C6101 Tatsewows 203-666-6911 October 9,1979 Docket No. 50-213 Mr. Boyce H. Grier, Director Region I Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Reference:
(1)
W. G. Counsil letter to B. H. Grier dated September 17, 1979.
Gentlemen:
Haddam Neck Plant Temperature Effects on Level Transmit;ers, I&E Bulj etin No. 79-21 Enclosed please find the replacement pages to the Reference (1) letter. These pages replace Tables 2 - 6 of the reference letter with corrected tables.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY
/Y[/
/
/7ONA W.. Counsil G
Vice President Attachment
^^P, 339 79103 0 O OM
DOCKET NO. 50-213 ATTACIC4ENT liADDAM NECK PLANT TEMPERATURE EFFECTS ON LEVEL TRANSMITTERS, I&E BULLETIN No. 79-21 3 A0 OCTOBER, 1979
TABLE 2 Corrections to allowable indicated steam generator narrow range water level for Reference Leg Heatup and Pressure changes following a high-energy line break, to assure that true level is between the level taps.
Containment Correction to Minimum Allowed Correction to Maximum Allowed Temperature, OF Indicated Level, % of Span Indicated Level, % of Span 120 3
-6 180 6
-6 200 7
-6 220 8
-6 240 9
-6 260 10
-6 Basis:
Assumed Level Calibration Pressure = 690 psia.
Assumed Reference Leg Calibration Temperature = 120 F.
50 psia 5. Pressure 5_931 psia.
2% Instrument Error is included in corrections.
Boiling in the Reference Leg will not occur unless the steam generator pressure drops below saturation pressure for the temperature in the reference leg.
Steam generator pressure would have to decrease to less than 35.4 psia for boiling to occur if the reference leg is at 260 F.
In determining the Correction to Maximum Allowed Indicated Level, thermal lag is taken into account. The most conservative case at maximum level is when containment temperature increases but the reference lag temperature remains at 120 F.
In determining the Correction to Minimum Allowed Indicated Level, the most conservative case is to assume the reference leg temperature increases immediately.
,m0 3A,I
TABLE 3 Corrections to allowable indicated steam generator wide range water level for Reference Leg Heatup and Pressure changes following a high-energy line break, to assure that true level is between the level taps.
Containment Correction to Minimum Allowed Correction to Maximum Allowed Temperature, F Indicated Level, % of Span Indicated Level, % of Span 120 6
-26 180 8
-26 2,q0 9
-26 220 10
-26 240 11
-26 260 11
-26 Basis:
Cold calibration 50 psia $_ Pressure $_ 931 psia.
2% Instrument error is included in corrections.
Boiling in the reference leg is not assumed.
In determining the Correction to Maximum Allowed Indicated Level, thermal lag is taken into account. The most conservative case at maximum level is when containment temperature increases but the reference lag temperature remains at 120 F.
In determining the Correction to Minimum Allowed Indicated Level, the most conservative case is to assume the reference leg temperature increases immediately.
~^3 342
TABLE 4 Correction to indicated pressurizer water level (calibrated with consi-deration given to temperature) for Reference Leg Heatup effects due to post-accident containment temperature (before reactor trip).
Maximum Containment Temperature Correction to Pressurizer Level Reached Before Reactor Trip, F
% of Span 120 0
180 4
200 5
220 6
240 8
260 10 Basis:
Assumed Level Calibration Pressure = 2020 psia.
Assumed Reference Leg Calibration Temperature = 637 F.
1000 psia
<_ Pressure
_ 2285 psia.
Instrument error adds +2% to correction.
Correction will be applied so as to lower the indicated level.
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TABLE 5 Corrections to allowable indicated pressurizer water level (calibrated with consideration given to temperature) for Reference Leg Heatup and Pressure changes following a high-energy line break, to assure that true level is between the level taps.
Containment Correction to Minimum Allowed Correction to Maximum Allowed Temperature, F Indicated Level, % of Span Indicated Level, % of Span 120 6
-9 180 9
-9 2'00 10
-9 220 12
-9 240 13
-9 260 15
-9 Basis:
Assumed Level Calibration Pressure = 2020 psia.
Assumed Reference Leg Calibration Temperature = 637 E.
2% Instrument error is included in. corrections.
1000 psia <_ Pressure <_ 2285 psia Boiling in the Reference Leg will not occur unless the pressurizer pressure drops below saturation pressure for the temperature in the reference leg.
Pressurizer pressure would have to decrease to less than 35.4 psia for boiling to occur if the reference leg is at 260 F.
In determining the Correction to Maximum Allowed Indicated Level, thermal lag is taken into account.
The most conservative case at maximum level is when containment temperature increases but the reference leg temperature remains at 120 F.
In determining the Correction to Minimum Allowed Indicated Level, the most conservative case is to assume the reference leg temperature increases immediately.
9 ': r
TABLE 6 Corrections to allowable indicated precsurizer water level (col _d calibrated) for Reference Leg Heatup and Pressure entnges following a high energy line break, to assure that true level is between the level taps.
Containment Correction to Minimum Allowed Correction to Maximum Allowed Temperature, F Indicated Level, % of Span Indicated Level, % of Span 120 13
-43 180 15
-43 2Q0 16
-43 2'20 17
-43 240 17
-43 260 18
-43 Basis:
Cold calibration.
1000 psia < Pressure <
2285 psia.
2% Instrument error considered.
Boiling in the Reference Leg is not assumed.
In determining the Correction to Maximum Allowed Indicated Level, thermal lag is taken into account. The most conservative case at maximum level is when containment temperature increases but the reference leg temperature remains at 120 F.
In determining the Correction to Minimum Allowed Indicated Level, the most conservative case is to assume the refererce leg temperature increases immediately.
'"3 345