ML17346A714
| ML17346A714 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie, Turkey Point, 05000000 |
| Issue date: | 01/14/1985 |
| From: | Williams J FLORIDA POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| L-85-19, NUDOCS 8501180048 | |
| Download: ML17346A714 (8) | |
Text
~ e REGULATORY ORMATION DISTRIBUTION SY M (RIDS)
AOCESSION NBR; 850 1 1 80048 DOC ~ DATE! 85/01/14 NOTARIZED; NO FACIL150 000 Generic Docket
'50
?50 Turkey Point Planti Unit 3i Florida Power>> and Light C'50 251 'Turkey Point-Planti Unit 0i Florida Power~'and Light C
50 335 St, Luc)e Plantr Unit 1< Florida Power L L)ght" Co.
'50 389:
St ~ 'ucie" Planti, Unit 2~ Florida Power 8 Light Co; AUTHe NAME AUTHOR AFFILIATION WILLIAMS~J ~ li~
Flor ida Power.
L Light Cb, RECIP ~ NAME'ECIPXENT AFFILIATION EISENHUT<D ~ G ~
Division of Licensing SUBJECT!
Forwards, info supplementing 8/1004 L 1101- )tns providing addi info re SPDS implementation plan 8 parameter selection rept"iper 840815 8
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FLORIOA POWER & LIGHTCOMPANY JAM 1 4 1885 L-85-19 Office of Nuclear Reactor Regulation Attention:
Mr. Darrell G. Eisenhut, Director Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Eisenhut:
Re: Turkey Point Units 3 & 4 Docket Nos. 50-250 & 50-25 I St. Lucie Units I & 2 Docket Nos. 50-335 & 50-389 SPDS Implementation Plan and P
5I ~iR The attached information supplements that provided in FPL letters L-84-276 dated October 4, l984 for the Turkey Point Plant and L-84-285 dated November I, l984 for the St. Lucie Plant which were submitted in response to NRC requests for additional information dated August 15, I 984 and September l4, I 984 respectively.
Should you have any questions regarding this information, please call us.
Yours very truly, J. W. Williams, Jr.
Group Vice President Nuclear Energy JWW/TCG/cab Attachment cc:
J. P. O'Reilly, Region II H. F. Reis, Esquire 8501180048 850114 PDR ADOCK 05000250 F
PDR PEOPLE... SERVING PEOPLE
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ATTACHMENT
RESPONSE
TO NRC UESTIONS During review of the Safety Parameter Display System (SPDS)
Implementation Plan and Parameter Selection Report for both St.
Lucie and Turkey Point
- Plants, the NRC reviewer raised several questions on the choice of maximum credible fault applied to the isolators for the SPDS.
In a
telephone conversation between FPL and NRC on November 15,
- 1984, FPL agreed to test the isolators at 120 VAC in the transverse mode at a current of 20 amperes.
As shown by Figure 1,
120 VAC was applied in the transverse mode across the non IE outputs of the Model
- 156, 980 and 981 isolator modules.
At the same
- time, an oscilloscope was used to monitor the class IE inputs of the isolator for any transients caused by the fault applied and to observe the steady state condition of the IE input side of the isolators during the fault.,
The fault was applied to each of the modules for a
minimum of 20 seconds to ensure adequate time for any failure to propagate and to allow sufficient time to observe the steady state condition of the IE inputs.
The test results are given below:
MODEL 156 There were three pulses approximately four microseconds in width and with an amplitude of 0.3 Volts within the first 35 ps of applying the fault.
No other perturbations were observed.
MODEL 980 The transient condition was a single pulse of 12 ps duration and 0.2 Vpk.-pk.
No other perturbations were observed.
MODEL 981 A 1.6 Vpk-pk, 8
ps.
pulse occured at the application of the 120 Vac then a 0.3 Vpk"pk 6 ps pulse occurred 100 us later and finally a
0.1 Vpk"pk 4
us
'pulse occurred 20 Is later.
No other perturbations were observed.
CONCLUSIONS FPL has reviewed the results of the test and determined that no components on the 1E input side of the isolators would be damaged or stressed should a
fault ever occur during plant operation.
The integrity of the isolation boundary has been maintained.
The fault voltage observed on the IE side was small compared to the normal signal voltage for an instrument loop (Typically 24 volts) and was of a
short duration such that no effect would be expected.
After the initial transient condition, no effect was observed on the IE side.
FPL concludes that the integrity of the isolation boundary would be maintained should a maximum credible fault occur during system operation.
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'OUTPUT FIGURE 1
TEST CONFIGURATION FOR MODEL 156,980 AND 9S I ISOLATORS DURING DBE TESTING C1 LLI O
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