L-79-107, Provides Status of Verification Program for Technique of Measuring Resistance Temp Detectors Time Constants
| ML17206A777 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 05/01/1979 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| L-79-107, NUDOCS 7905070410 | |
| Download: ML17206A777 (6) | |
Text
REGULATC INFORNATION DISTRIBUTIONSTER (RIDE)
ACCESSION NBR:7905070910 DOC ~ DATE: 79/05/01 NOTARIZED:
NO FACIL:50"335 ST ~
LUCIE PLANTF UNIT 1
FLORIDA POIVER 8
LIGHT CO ~
AUTH ~ NAME AUTHOR AFFILIATION UHRIGF R ~ E ~
'LORIDA POKER Pt LIGHT CO ~
RECIP,NAME RECIPIENT AFFILIATION REID R ~ N ~
OPERATING REACTORS BRANCH DOCKET 05000335 SUB JECT:
PROVIDES STATUS OF VERIFICATION PROGRAM FOR TECHNIQUE OF MEASURING RESISTANCE TEMP DETECTORS TIME CONSTANTS ~
DISTRIBUTION CODE:
ASSIS COPIES RECEIVED:LTR ~ ENCL +
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TITLE: GENER'AL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LIC NOT'ES RECIPIENT ID CODE/NAMK ACTION:
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~t FLORIDA POWER 8 LIGHT COMPANY May 1, 1979 L-79-107 Office of Nuclear Reactor Regulation Attention:
Mr.
R.
W. Reid, Chief Operating Reactors Branch 84 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Reid:
Re:
St. Lucie Unit 1
Docket No, 50-335 Resistance Tem erature Detectors The purpose of this report is to inform you of the status of the St. Lucie Unit 1 verification program for the Loop Current Step
Response
(LCSR) technique of measuring Resistance Temperature Detector (RTD) time constants.
During the period of March 20 through March 22, 1979, LCSR tests were per-formed on the sixteen (16) protection channel RTDs while at steady-state full power conditions.
The results of these tests compared with the earlier surveillance of October, 1978 are tabulated below; TINE CONSTANT (SECONDS)
Tag No.
TE-1112CA TE-1112HA TE-1122CA TE-1122HA TE-1112CB TE-1112HB TE-1122CB TE-1122HB TE-1112CC TE-1112HC TE-1122CC TE-1122HC TE-1112CD TE-1112HD TE-1122CD TE-1122HD October 1978 4.0,+ 0.4 4.4'+ 0.2 6.0 + 0.6 5.3 + 0.5 5.0 + 0.5 5.0 + 0.9 5.9 + 0.3 5,8 + 0.3 4.5 + 0.7 5.4 + 0.4 5.4 + 0.3 5.4 + 0.4 4.8 + 0.3
'.9
+ 0.5 5.7 + 0.5 4.3 + 0.5 1
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March 1979 4.1
+ 1.2/-0.7 4.5 + 0.3 6.0 + 0.7 5.7 + 0.7/-0.5 4,8 + 0.6/-0.4 5.3 + 0.6 5.4 + 0.2 5.6 + 0.4 4.3 + 0.8/-0.5 5.4 + 0.7/-0.5 5.7 + 0.5 5.0 + 0.7/-0.5 4.9 + 0.5 5.7 + 1.0/-0.7 5.6 + 0.9/-0.7 4.8 + 1.6/-0.9 79050VO+d6 o
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Office of Nuclear Reactor Regulation Attention: Mr.
R.
W. Reid, Chief'perating Reactors Branch 84 Page 2
Analysis of the test data continues to confirm that the time constant of each RPS-RTD is less than the 8.0 second limit of Technical Specification Table 3.3-2.
Comparison of the results of the current surveillance with the October, 1978 tests shows an average time constant of 5.2 seconds versus 5.1 seconds.
In summary, the results of LCSR Surveillance testing at the St.
Luci e Plant in October, 1978 and March, 1979 indi cate the following:
1.)
The time constant of each protection channel RTD is less than the specified limit of 8.0 seconds, 2.) There is no evidence of a generic increasing trend in the time constant, of these
- sensors, 3.) Replacement of additional RTD's to preclude degradation is not needed at this time.
Ver
- yours, obert E. Ohrig Vice President Advanced Systems 5 Technology REU/MAS/paf cc:
Mr. James P. O'Really, Region II Harold F. Reis, Esquire