ML20064C128
| ML20064C128 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 12/14/1982 |
| From: | Beckham J GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 IEB-80-16, NUDOCS 8301040328 | |
| Download: ML20064C128 (3) | |
Text
Georg a Poeer Ccmpar/
333 P edmon! Aveaue At!anta Gecrg a 30308 Tela m one 411 526 7020 Ma*rg Acdross F
Pcs? Ot*-ce Bax 4545 At anta Goug a 30102 b
Georgia Power J. T. Beckham, Jr.
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O IN sovttrem em symm v,ce Pres ce-t a-c cerea va arr hee M,1982 nuclear non-a: nn U. S. Nuclear Regulatory Commission
REFERENCE:
Office of Inspection and Enforcement RII: JPO Region II - Suite 2900 50-321/50-366 101 Marietta Street, NW I&E Bulletin Atlanta, Georgia 30303 80-16 ATTENTION: Mr. James P. O'Reilly GENTLEMEN:
The following letter is submitted as a supplemental response to our letter of July 29, 1980.
The only safety system which contains the subject transmitter is the MSIV leakage control system for Unit 2.
A description of the safety related application of the model 1151 transmitters used in the MSIV-LCS is given in the attached Table 1.
The inboard air dilution flow and the outboard air dilution flow transmitters, items 3 and 7 in Table 1, can never be subjected to an over range or under range condition of greater than 140%.
The remaining devices are connected to either the main steam line pressure or the reactor vessel pressure and cannot be subjected to an under range condition of more than 140%.
The only condition of concern, therefore, is the over range condition of items 1,2,4,5,6,8, and 9.
Each of these transmitters is subjected to an over range condition of 1000% to 3000% during normal plant operation.
The anomalous on-scale readings can be any value between 4 and 20 milliamps output current.
This means that any transmitter with an anomalous output may cause an erroneous trip or reset condition to occur.
The anomalous condition will also result in an anomalous pressure indication on the associated panel meter.
The anomalous trip condition would result in defeating the permissive action of the trip function and is not a desirable condition.
The system initiation is, however, controlled manually by the operator using a key locked switch; therefore, the system cannot be inadvertently initiated solely as a result of inadvertent trips due to anomalous transmitter outputs.
No plant safety function would be compromised by the anomalous transmitter outputs, but system initiation logic would be seriously affected.
9301040328 921214 PDR ADOCK 05000321 3~E'S t
Georgia Power A U.'S. Nuclear Regulatory Commission Office of Inspection and Enforcement December 14, 1982 Page Two Justificatien for continued operation is based on the following discussion.
Hatch Unit I was not licensed with a MSIV leakage control system.
In response to NUREG-0737, we have completed an analysis which assesses the dose to the control room operators following a design basis loss of coolant accident assuming a realistic leakage rate through the MSIVs.
The results of the calculation demonstrated that all of the dose values are within the dose limits set forth in SRP 6.4 and GDC-19. Although this analysis has been completed for Unit 1, it is equally applicable to Unit 2 since the units are almost identical.
Further a comparison between the Unit 1 and Unit 2 offsite dose calculations has been completed and has provided assurance that no offsite dose limits will be exceeded assuming no operation of the MSIV Leakage Control System.
Based on the above, continued cperation is justified.
As part of the upcoming Unit 2 outage, we intend to replace the Model 1151 transmitters with Model 11538 transmitters.
If there are any further questions, please contact this office.
Very truly yours,
'h
- f J. T. Beckham, Jr.
MJB/mb Attachment xc:
H. C. Nix, Jr.
Senior Resident Inspector iI17 75
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i TABLE 1 i,I g
POSEM0riT TRANSMITTERS MODEL 1151 INSTALLED _ TM HATCH 7 i:SIV-LCS b
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e.
Trip E'ement Normal Service /
Range
- Setting Item MPL NO.
GE PART NO.
Rosemount Part flo. _ Range Pressure Function Setting % Full Scale 1
E32-N050 163C1564P611203 Il51GP6A52ft0 0-lC0psig 1000psig RPV Press.0-100psig' 35%dec
't 9
2 E 32-N051 163C1558P512203 ll51 AP5A52513 0-30 psia 1000psig Inbd.MSL 0-25 psia 80%inc Press.
3 E32-N054 163C1561P411203 ll510P4452M3 0-l'30*'H O -0.25"H 0 I nbd.
0-100"H O 7%dec 2
g 2
Dilution Air 4
E32-N055 163C1564P611203 ll51GP6A52MO 0-30psig 1000psig Outbd.t1SL 0-100psig 35%dec Press.
5 E32-N056 163C1558P511203 1151AP5A52MB 0-30 psia 1000psig Outbd.fiSL 0-25 psia 64'./73L Press.
inc 6
E 32-ft056 163C1564P611203 1151GP6A52ft3 0-130psig 1000psig P.PV Press.0-100psig 35%dec 7
E32-N059 163C1561P411203 ll51DP4A52MB 0-150"H O -0.25"H~,,0 Outbd.
0-100"H O 30%dec 2
2 Dilution Air 8
E32-f;060 163C1564P611203 ll51GP6A52MB 0-100psig 1000psig RPV Press.0-100psig 35%dec h
9 E32-N061 163C1564P611203 ll51GP6A52M3 0-100psig 1000psig Inbd,HSL 0-100psig 35%dec Press.
- field calibration
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