ML20136C480
| ML20136C480 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/20/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-409, REF-PT21-85, REF-PT21-86-012-000 215, HO-850485-(O), PT21-86-012-000, PT21-86-12, NUDOCS 8601030281 | |
| Download: ML20136C480 (4) | |
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CD&Lm Carolina Power & Light Comdahy [8 p
'=Cu SHEARON HARRIS NUCLEAR PROJECT P. O. Box 165 New' Hill, North Carolina 27562 December 20, 1985 File Number:
SHF/10-13510 Letter Number: H0-850485 (0)
NRC-409 Dr. J. Nelson Grace United States Nuclear Regulatory. Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,00 KW - Unit 1 WESTINCHOUSE SAFETY GRADE CORE EXIT THERMOCOUPLES, ITEM 215
Dear Dr. Grace:
Attached is our third interim report on the subject item, which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on May 28, 1985. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by March 1, 1986.
Thank you for your consideration in this matter.
Yours very truly, R. A. Watson Vice President Shearon Harris Nuclear Power Plant
~
MW/cwj Attachment cc: Messrs.' C. Maxwell (NRC-SHNPP)
J. M. Taylor (NRC)
W M302B1 851220 PDn ADOCM 05000400 i
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CAROLINA POWER & LIGHT CCtiPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 THIRD INTERDi REPORT WESTINCHOUSE SAFETY GRADE CORF EXIT THrRM0 COUPLES ITDi 215 DECDiBER 11, 1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR, PART 21
4 S UBJECT:
Shearon Harris Nuclear Power Plant - Unit No. I 10CFR50.55(e) and 10CFR21 Reportable Deficiency. Testing of various components of the Safety Grade Core Exit T/C System indicates that the thermocouple signal will be maintained although some errors could be experienced during HELB.
This potential error could exceed the allowance for certain systems using the thermocouple system.
ITEM:
Safety Crade Core Exit Thermocouples SUPPLIED BY:
Westinghouse NATURE OF DEFICIENCY:
As part of qualification testing done by Westinghouse during the WCAP 8587 Program, some errors were experienced in the thermocouple signal. These errors are postulated to be caused by a combination of moisture ingression and thermal expansion in the thermocouples, connectors, potting adapters, splices, and the reference junction box.
The thermocouple signal is used in three areas at Shearon Harris; Reactor Coolant System (RCS) subcooling margin and the detection of Inadequate Core Cooling (ICC), and temperature compensation of the Westinghouse Reactor Vessel Level Indication System (RVLIS).
DATE PROBLEM OCCURRED:
.CP&L was notified May 10, 1985.
DATE PROBLEM R EPORTED:
On May 28, 1985, CP&L (N. J. Chiangi) notified the NRC (Mr. A. Hardin) that the item was reportable under the provisions of 10CFR50.55(e) and 10CFR, Part 21.
SCOPE OF PROBLEM:
These potential ~ errors affect the RCS subcooling margin calculation and the In 3 equate Core Cooling detection.
The RVLIS temperature c ompensation is not adversely affected.
SAFETY D4 PLICATION:
CP&L has not fully completed its evaluation of the
. potential errors and their effect due to ongoing Westinghouse investigation. With current information available, potential for errors could result in consequences more severe than currently described in plant final safety analysis.
REASON DEFICIENCY IS REPORTABLE:
This is reportable as a design error since, as presently designed, the error in tn= thermocouple signal could be greater than that assumed in ti.e present analysis.
CORRECTIVE ACTION:
Westinghouse is to establish cause and recommendations on modifications necessary to correct problem. Westinghouse has completed testing on :the subject equipment. Results are being evaluated by CP6L and Westinghouse. Corrective action will be implemented, if necessary, when the evaluations are complete.
FINAL REPORT: The final report on this item is pending completion of the corrective actions described above.
It is currently projected that the final report will be issued by March 1, 1986.
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