ML20066J663
| ML20066J663 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 02/20/1991 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ULNRC-2368, NUDOCS 9102260336 | |
| Download: ML20066J663 (3) | |
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UVION:
- d"'d Eucnue war 20, 1991 C;P""~
J U.S. Nuclear Regulatory commission l
ATTN: Document Control Desk Mail Station-Pl-137 Washington, D.C.
20555 ULNRC-2368 Gentlemen:
' DOCKET NUMBER 50-483 CALLAWAY PLANT AMENDMENT NUMBER 57-
References:
- 1. ULNRC-2196 dated 4-12-90
- 2. ULNRC-2244 dated 7-9-90
- 3. OL Amendment No. 57 and NRC SER dated 9-20-90 Amendment Number 57 to the Callaway Facility Operating License No. NPF-30.approvad Technical Specification changes to allow-the replacen.ent of the resistance temperature detector CRTD) bypass system with an RTD/thermowell system mounted dLrectly into the hot and cold legs of the reactor i
coolant system (RCS).
Reference 1 submitted the original amendment application.
Reference'2 supplemented the setpoint calculations.of Reference 1=with an; updated RCS flow measure-ment uncertainty calculation.
Reference :2 - also committed to_ compare = post-modification calorimetric. data =against-the most recent pre-modification calorimetric dataito assess the effects-of RTD bypass elimination on T-Hot at callaway.
The requested-information'is attached.. With regard,to
- the other1 commitments discussed in the Reference 3 SER,-
-both the. active and' spare = elements of the new dual element-Weed-RTDs were-response time tested.using the. Loof current Step Response'(LCSR) methodology after the RTDswere u
L installed and ono newly calibrated'RTD will be installed at Refuel 6-(in the-fall'of 1993), and alternating refuelings thereafter, to ensure that RTD drift remains random in nature (i.e., not-.in the same direction).
If you have any questions on-the-attachment, please 7
contact-us.
Very truly-yours,
- - M Donald F. S anell GYY/ dis f
i f Attachment 9102260336 910220
-PDR-ADOCK 05000483
[Obq /
P. -
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, cc i T. A. Baxter, Esq.-
Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.
Washington, D.C.
20037 Dr.
J.- O.
Cermak CFA, Inc.
4 Professional Drive (Suite 110)
Gaithersburg, MD 20879 R.
C.
Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
-Bruce Bartlett Callaway Resident Office U.S. Nuclear Regulatory Commission RR#1
'Steedman, Missouri 65077 M. D. Lynch (2)
~ Office of Nuclear Reactor Regulation U.S.-Nuclear Regulatory Commission
-1 White Flint, North, Mail Stop 13E21 11555 Rockville Pike Rockville, MD 20852
. Manager, Electric Department Missouri Public-Service Commission P.O.
Box'360
- Jefferson City, MO 65102
j i
t COMPARISON OF RC8 TEMPERATURE INDICATION PRE & POBT RTD BYPASS' LOOP ELIMINATION a
6-16-89 Pre-modification (taken at 99 8% power)
LOOP 1' LOOP 2 LOOP 3 LOOP 4 4
T-Hot' 617.2'F 617.5'F-615.9'F 616.3*F
-T-Cold.
iS58.4*F.
558.1*F 558.6'F
-557.6'F Average T-Hot
= 616.7'F Average T-Cold = 558.2*F 1-22-91_ Post-modification (taken at 99.6% power)
_ LOOP 1.
.. LOOP 4 i
J T-Hot.
618.5'F 616.0*F 618.1*F
. 616. 7 ' F.
i i
T-Cold 558.7'F' 557.9'F 558.9'F 557.6*F 3
Average T-Hot
= 617.3*F-JAverage-T-Cold'= 558.3*F k
v
.During:the meeting held at.NRC offices?on July 20,.1990'to' H
discussTRTD Bypass Elimination, slides-were presented.
depicting the effect on-T-Hot _of:the RTD' Bypass Elimination at Salem' Units 1 andJ2..The change in.T-Hot was--0.12*F.and
+0.'48'F ifor' Units if and ~ 2, respectively. 'The former.was.
. stated byfPSE&G and ABB/CE to be well within.the accuracy of the data. The latter was stated by PSE&G and ABB/CE to.be
-within_the accuracy of the calorimetric. Similar conclusions
- can be drawn for Callaway as were drawn for Salem Unit 2..
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