ML20093G856
| ML20093G856 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 06/08/1984 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20093G837 | List: |
| References | |
| NUDOCS 8407240443 | |
| Download: ML20093G856 (3) | |
Text
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3 A
BALTIMORE GAS AND ELECTRI CHARLES CENTER.P. O. BOX 1475 BAl YlMORE, MARYLAND 21203 ARTHUR E. LUNDVALL. JR.
Vict PRESIDENT SUPPLY June 8,1984 U.S. Nuclear Regulatory Commission Docket Nos.
50-317 Region 1 50-318 631 Park Avenue King of Prussia, PA.19406 License Nos.
DPR-53 DPR-69 ATTENTION:
Mr. R. W. Starostecki, Director Division of Project & Resident Programs Gentlemen:
As a result of conversations between members of the Regional staff and our Electrical and Controls section we are providing clarification on a recent response to NRC Inspection Report 50-317/83-31; 50-318/83-31.
Enclosure (1) to this letter provides clarification to Item A.2 of our March 8,1984, response.
Should you have further questions regarding this reply, we will be pleased to discuss them with you.
1 Very truly yo0rs, wcluesLL ~
c AEL/ LOW /sjb Enclosure cc:
D. A. Brune, Esquire G. F. Trowbridge, Esquire D. H. Jaffe, NRC T. Foley, NRC 4
I' 8407240443 840703
-PDR ADOCK 05000317 0.
. PDR _ _
w
y ENCLOSURE 1 REVISED REPLY TO APPENDIX A OF NRC INSPECTION REPORT NO. 50-317/83-31; 50-318/83-31 ITEM A.2 A violation was identified involving failure to maintain the Pressurizer pressure safety channels within required limits of accuracy (a problem previously identified due to environmentally induced temperature drift and hysteresis associated with installed Barton transmitters)in modes requiring operability of the instrumentation.
Upon reviewing the concerns expressed by the Resident Inspector in the Inspection Report, we have determined that incorporating some changes to the trending program (as described on page 8 of I&E Inspection Report 83-31) will be beneficial in improving performance of the program. We feel that this program is the most viable means of providing corrective actions to calibration drift resulting from temperature and hysteresis effects that we currently experience with our Barton transmitters.
The improved trending program is currently in effect and is described below.
1.
During MODES 1 through 3 the following parameters are recorded:
Pressurizer pressure safety channels (1-PT-102A, B, C, D) a.
b.
Pressurizer pressure (non-Barton) control channels (1-PT-100X,Y) c.
Primary System pressure as indicated from a temporary gauge associated with the primary sample system.
d.
Containment Temperature e.
Reactor Power 2.
These parameters are tabulated and plotted on a daily basis with the exception of item c, which is recorded weekly.
l 3.
The results are reviewed and compared in the following manner:
MODES 1 and 2 Pressurizer pressure safety channels are compared to the pressurizer p)ressure control program setpoint (2250 psia at normal operating conditions. The l
Pressurizer pressure control program setpoint is verified daily by comparison l
with the Pressurizer pressure control channel instrumentation data.
j Pressurizer pressure safety channels are compared to the temporary gauge l
data-Any identified deviation exceeding 10 psi initiates investigations to determine the rate of drift. This rate is used to schedule recalibration to prevent exceeding a 15 psi deviation. The 15 psi limit is derived from the instrument error allowance in_ the high Pressurizer pressure and thermal margin / low pressure reactor protective system trip setpoints.
j ENCLOSUREI REVISED REPLY TO APPENDIX A OF NRC INSPECTION REPORT NO. 50-317/83-31; 50-318/83-31 MODE 3 l
Pressurizer pressure safety channels A, B, C and D are compared individually per channel, then compared with control channel indications and finally compared with the temporary gauge indication. As with MODES 1 and 2, a deviation greater than 10 psi will promp: scheduling recalibration of the safety channel instrumentation.
To ensure that the safety channel instrumentation is operable prior to entry into modes requiring their operabilit, a revision has been made to the Pre-Startup Checklist (OP-6) j to perform a channel check (similar to that required by surveillance testing during normal operation) prior to entry into MODE 3 from MODE 4.
This revision was completed on February 6,1984.
In February of this year the improved trending program was instrumental in identifying safety channel drift and recalibration was performed as a result. It is otr intent to ccatinue this program until the Pressurizer pressure transmitters (1-PT-102A, B, C, D) are modified to correct the drif t problem or are replaced with acceptable substitutes.'
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