L-81-226, Clarifies 810409 Response to NUREG-0737,Item II.E.4.2.5 Re Containment Pressure Setpoint.Clarifies Bistable Input, Output & Setpoint Value
| ML17209B138 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 05/27/1981 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.4.2, TASK-TM L-81-226, NUDOCS 8106020470 | |
| Download: ML17209B138 (4) | |
Text
REGULATO INFORMATION DISTRIBUTION TEM (RIDS)
ACCESSION NBR: 8106020970, DOC, DATE! 81/05/27 NOTARIZED:
NO FACIL':50 335 St+ Lucfe Plant<, Unit i~ Flor fda Power 8
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F l or.i da Power 8 Lfght Co.
RECIP ~ NAME~
'ECIPIENT AFFILIATION EISKNHUT'pe G ~
Division of Licensing DOCKElT' 05000335 SUBJECT ~
Cl ar iff es 810409.r esponse to NUREG 0737'tem,. IZ ~ E',4 ~ 2'.5: r'e containment pressure setpoint;Clarifies" bistable~ input/
output 8 setpoint value ~
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FLORIDA POWER 5 LIGHTCOMPANY Nay 27, 1981 L-81-226 Office of Nuclear Reactor Regulation Attention: Mr. Darrell G. Eisenhut, Director Division of Licensing U. S. Nuclear Regulatory Commission Washi'ngton, D. C.
20555
Dear Mr. Eisenhut:
Re:
St. Lucie Unit 1
Docket No. 50-335 Post TMI Re uirements Our letter L-81-163, dated April 9, 1981 transmitted our response to Item II.E.4.2.5. of NUREG737, Containment Pressure Setpoint.
We have since been requested by our Resident Inspector to clarify the portion of the letter regarding the output of the bistables and the value used for the percentage of the range represented by setpoint.
It would appear that the clarification is required due to the nomenclature used in the bistables manufacturer's technical manual, as well as an error found therein.
- 1. Clarification of Bistable In ut/Out ut As indicated in L-81-163, the bistable input is 1 to 5 VDC, and the bistable output is 0.5 to 5 VDC which in turn drives the ON-OFF element to produce an output voltage of +15V or OV from the bistable.
The output voltage (0.5 to 5VDC) will also drive a meter.
Thus the real bistable output to the CIS is + 15V or OV, however the manufacturer considers the modified input (0.5 to 5VDC) as the bistable output which drives the mentioned ON-OFF element.
- 2. Clarification of the bistable set oint The bistable set point should be 10% of the total range (0.5 to 5VDC) instead of 8.3% stated in our letter.
5
~io PEOPLE... SERVING PEOPLE
Mr. Darrell G. Eisenhut, Director Page 2
The 8.3% figure was taken from the manufacturer's technical manual which was verified to be incorrect.
The manufacturer was contacted and it was clarified that the bistable set point is 10% of the bistable output range (0.5V to 5VDC) which corresponds to 0.95 VDC (0.45 + 0.5).
Very truly yours, obert E. Uhrig Vice President Advanced Systems 6 Technology REU/JEM/ras Attachment cc:
Mr. James P. O'Reilly, Region II Mr. Harold F. Reis, Esquire