ML17206A594
| ML17206A594 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 01/03/1979 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| L-79-2, NUDOCS 7901090199 | |
| Download: ML17206A594 (6) | |
Text
BEGULATQY INFOBNATION DISTBIBUTIOIYSTEII (BIDS)
ACCESSION NBR -7901090.1 99 DOC.DATE-79/01/03 NOTARIZED-NO FACIL:50-335 SAINT LUCIE Ol, FLORIDA POHER 8 LIGHT CO..
AUTH.NAME AUTHOR AFFILIATION UHRIG,R.F.
FLORIDA POWER 8, LIGHT CO.
RECIPE NAME RECIPIENT-AFFILIATION REID, B.W.
'**OPERATING REACTORS BRANCH 4 DOCKET Py 05000335 SUBJECT-Loop Current Step
Response
tests to date indicate that time constants of RPS RTD's are all less that 8.0 second limit specified by Tech Spec Table 3.3-2, 8, there is no evidence of generic trend to increasing, time constants for sensors.
DISTRIBUTION CODE:
A001S COPIES RECEIVED-LTB + ENCL ~
SIZE:
TITLE.- GENERAL DISTRIBUTION FOB AFTER ISSUANCE OF OPERATING LIC NOTES-RECIPIENT ID CODE/NAME
~ ACTION:
05 BC Nf/NA'Q I NTERNAL~
15 CORE PEBF BB 17 ENGR BR 19 PLANT SYS BR 21 EFLT TRT SYS EXTERNAL- 03 LPDR 23 ACRS COPIES LTTB ENCL 1
16 I
REC I PI ENT, ID CODE/NAME 02 NRC PDR 14 1.1ANAUER 16 AD SYS/PROJ 18 BEAC SFTY BB
'0 EEB 22 B R INKMAN 04 NSIC COPIES LTTB ENCL TOTAL NUMBER OF COP I ES REAUI RED:
LTTR 38 FNCL
'7 t,
h i
tl n
P.O. BOX 5291004 MIAMI,FL 33152
+>Ilia+
FLORIDA POWER & LIGHT COMPANY January 3,
1979 L-79-2 Reactors on gTO~~ DD"'~t'.T
Dear Mr. Reid:
Re:
St. Lucie Unit 1
Docket No. 50-335 Resistance Tem erature Detectors Office of Nuclear Reactor Regulation Attention:
Mr. R.
W. Reid, Chief Operating Reactors Branch b4 Division of Operating U. S. Nuclear Regulatory Commissi Washington, D.
C.
20555 This letter gives the status of the Florida Power
& Light Company (FPL) veri fication program for the Loop'urrent Step
Response
(LCSR) technique of measuring Resistance Temperature Detector (RTD) time constants at St.
Lucie Unit l.
In January, 1978, the surveillance required by Technical Specification 4.3.1.1.3 was performed by an FPL consultant on the Reactor Protection System (RPS)
Channel A RTD's.
The test results were discussed with members of the NRC staff during several telephone conversations.
As a result of the discussions, and in accordance with our letter L-78-180 of May 19,'978, available spare RTD's were installed (in May) in place of the four Channel A
RTD's and were tested by the LCSR method during the startup of Cycle 2.
In further conformance with our May 19 letter, surveillance testing of all 16 RTD's supplying input to the RPS was performed in October, 1978.
The results of these tests are tabulated below:
Time Constant seconds Ta No.
Januar 1978 Ma 1978*
October 1978 TE-1112CA TE-1112HA E-1122CA E-1122HA E-1112CB E-1112HB E-1122CB E-1122HB E-1112CC E-1112HC E-1122CC E-1122HC E-1112CD E-1112HD E-1122CD E-1122HD 4.0 + 0.2 6.2 + 0.5 5.5 + 0.2 5.0 + 0.5
- S are RTD's in 4.2 + 0.4 4.4 + 0.3 5.7 + 0.3 5.6 + 0.3 stalled in Chan 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 4.9 + 0.5 5.7 + 0.5 4.3 + 0.5 nel A
~0
~0 7901090 /014 PEOPLE SERVING PEOPLE
)
P Y
Office of Nuclear Reactor'Regulation Page Two Comparison of the May test results (replacement sensors) with the January test results (original sensors) shows an apparent improvement in only one of the four time constants.
Comparis'on of the October test results with the May test results indicates that there was no significant change in the measured time constants of the four Channel A PTD's during the 5-month interval between tests.
In summary, the results to date of LCSR testing at St. Lucie Unit 1 indi cate:
1)
The time constants of the RPS RTD's are all less than the 8.0 second limit specified by Technical Specification Table 3.3-2.
2)
There is no evidence of a generic trend toward increasing time constants for these sensors.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems and Technology REU/MAS/cpc cc:
Mr. James P. O'Rei lly, Region II Harold F. Reis, Esquire
0