ML20199J236
| ML20199J236 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/29/1998 |
| From: | Westreich B NRC (Affiliation Not Assigned) |
| To: | Randolph G UNION ELECTRIC CO. |
| References | |
| TAC-MA0177, TAC-MA177, NUDOCS 9802050265 | |
| Download: ML20199J236 (4) | |
Text
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Jantiary ~ 29,1998 Mr. Garry L. Randolph v.
Vice President and Chief Nuclear Officer
_i I
Union Electric Company Post Office Box 620 Fulton, Missouri 65251
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAl) REOARDING REACTOR TRIP SYS1EM (RTS) AND ENGINEERED SAFETY FEATURES ACTUATION SYSTEM (ESFAS) DELTA-T FUNCTIONAL UNITS TECHNICAL l
SPECIFICATION AMENDMENT. REQUEST (TAC NO, MA0177)
Dear Mr. Randolph:
^
By letter dated October 31,- 1997, Union Electric (UE) submitted an application for amendment -
to Facility Operating License No. NFP-30 for the Callaway Plant. Specifically, UE requested to revise the technical specifications to change the setpoint and allowable values for certain RTS ano ESFAS functional units and revisa the associated Bases, Notes and Survaillance Requirements.
The staff has reviewed your submittal ano determined that further Information is needed to -
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complete our review. The requested information in the enclosure. Please provide your response to the staff's RAI within 30 days of the date of this letter in order to support the staff's review schedule. If you have any questions regarding the content of this RAI, pleast ntact me at (301) 415-3456.
Sincerely, Original Signed By Barry C. Westreich, Project Manager Project Directorate IV-2 Division of Reactor _ Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-483 DISTRIIllTION:
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Enclosure:
Request for Additional Information PUBLIC ACRS PDIV-2 Reading (
PGwynn, Region IV cc w/ encl:: See next page EAdensam Technical Branch WBateman BWestreich EPeyton
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Professional Nuclear
- Mr. Otto L. Maynard
- Consulting, Inc.
President and Chief Executive Officer 19041 Raines Drive Wolf Creek Nuclear Operating Corporation -
De: wood, Mary!and 20855 P.O. Box 411 Burlington, Kansas 6683g Garald Chamoff, Esq.
Thomas A. Baxter, Esq.
Mr. Dan 1. Bolef, President
. Shaw, Pittman, Potts & Trowbridge v y Drey, Eepresentative a
2300 N. Street, N.W.
Goard of Directors Coalition Washington, D.C. 20037 for the Environment 6267 Delmar Boulevard Mr. H. D. Bono University City, Missouri C3130 Supervising Enginear-Quality Assurcnce Regulatory Support Mr. Lee Fritz Union Electri Company-Presiding Commissioner S
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Post OMice Box 620
- Callaway County Court House
- Fulton, Missouri 65251 10 East Fifth Street Fulton, Missouri 65151 U.S. fJuclear Regulatory Commission Resident inspector Office Mr. Alan C. Passwater, Manager 8201 NRC Road Licensing and Fuels Steedman, Missouri 050 7-1302 Union E ectric Company Post Office Box 66149
, Mr. J. V. Laux, Manager St. Louis, Missouri 63166-614g Quality Assurance Union Electric Company Post Office Box 620 Fulton, Missouri 65251 Manager-Electric Department-Missouri Public Service Commission 001 W. High Post Office Box 360
' Jefferson City, Missouri 65102 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission
- Harris Tower & Pavilion 611 Ryan Plaza Drive, Suite 400 Artington, Texas 76011-8064 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P.O. Box 176 Jefferson City, Missouri 65102 l
O BEQUEST FOR ADDITIONAL INFORMATION REGARDING REVIEW OF LICENSE AMENDMENT REQUEST RTS AND ESFAS DELTA-T FUNCTION *L UNITS CALi AWAY PLANT. UNII.1 DOCKET NO. 50-483 1.
Provide a copy of the setpoint calculation showing Total allowance (TA), Channel Statistical Allowance (CSA) each for Functional lJnits OT Delta T (K1) OT Delta P (K4) and GG water Low-Low Vessel Delta T (power-1 and Power-2) for reador trips and for AFW start ESFAS functions.
2.
Provide a copy of the calculations used for ULNRC-2808 dated June 4,1993, ULNRC-03198 dated April 17,1995, and ULNRC-2196 dated April 12,1990.. Please note that these documents are included as References 2,3 and 4 to the October 31,1997 submittal.
3.
In reference to the "Significant Hazards Evaluation" more information is needed as noted below.
a.
Item 2, page 3 of the Attachment 1: It is stated that out of random and sys;ematic portions of the Process Measurement Accuracy (PMA) error (due to hot leg streaming), the systematic component will be replaced with a bias considering the "bumdown effect" Provide information as to how the blas-value was calculated or provide a copy of the calculation for this bias. Also, it is not c' ear how the random portion of the PMA could be eliminated from the OT Delta T setpoint calculation since this error-component will always be present (due to some streaming and due to other effects), although In some circumstances its value may be different. Explain how elimination of thq random PMA error component is justified by moving the axial-flux-difference (AFD) penalty function deadband by 2 percent on both sides.
b.
Item 3, page 3 of the Attachment 1: it is stated that RTD sensor calibration accuracy and drift can be eliminated from the setpoint calculation because (a) periodic re-normalization of each loop's parameters performed during quarterly surveillance will comper ate for the RTD uncertainty, (b) an additional error component which has treen added for power calorimetric that will compunsate for the RTD sensor calibration accuracy, and (c) addition of amdown effect bias will compensate for th RTD drift.
?r this situation, if OT Alta T protection is required due to a transient during the period between the two successive surveillances (i.e., just before the loop being re-normalized), how will the loop respond without compromising eafety since RTD accuracy and drift are eliminated from the setpoint calculation. Also, justify
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by a quantitative ovaluation that the bumdown effects bias will compensate for the RTD drift in addition to compensating the random component of PMA.
4.
Provide more detailed discussions and justifications for the following changes, in.
addition provide a discussion of the effect of these changes on analyses and operating
- limits / assumptions. Provide a comparison of your new setpoints to the analyt' cal limits.
c.
The 2 41 percent RTP increase in the Nominal Trip Setpoints for the Vessel delta T Penei and Power-2 portions of the SG Water Level Low-Low RTS and EFFA1 @ functions.
b.
Tne 2 Mrcent reduction in the q(t)- q(b) values.
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