ML20128B867
| ML20128B867 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 04/24/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-354, REF-PT21-85 139, NUDOCS 8505280095 | |
| Download: ML20128B867 (4) | |
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4 gpgg Carolina Power & Light Company Ub APil26 pj;. I cl P. O. Box 101, New Hill, N. C. 27562 April 24,1985 Dr. 3. Nelson Grace NRC-354 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 dAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 -
7300 PROCESS EQUIPMENT NTC CARD PROBLEM, ITEM 139
Dear Dr. Grace:
Attached is our final report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on June 30, 1933. With this report, Carolina Power & Light Company considers this matter closed.
If you have any questions cencerning this matter, please do not hesitate to contact me.
Yours very truly, yff 24:nt R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/rt A ttachmer.t cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) v,-
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT
~ UNIT 1 FINAL REPORT.
TEMPERATURE CHANNEL TEST (NTC) CARD ITEM NO.139 APRIL 23,1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21
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.f r _ sA-I SUB3ECT:
.SISearon Harris 'Naclear Power Plant Unit No. -1,10CFR50.55(e)
- 'and 10CFR21 reportable' deficiency in the Temperature Channel Test- (NTC): card purchased under the NSSS contract-with
-Westinghouse, Purchase Order NY-435002, Shop Order 320.
ITEM:
Westinghouse 7300 Process Protection System NTC Card Relay.
', SUPPLIED BY:
~ Westinghouse Electric Corporation, Industry Systems Division,
. Pittsburgh, Pennsylvania.
NATURE OF DEFICIENCY:
During seismic testing of the Temperature Channel Test (NTC) card, contact bounce was - experienced in the mercury relay utilized on this card.
. DATE PROBLEM OCCURRED:
CP&L. received notice of this" problem in Westinghouse Letter CQL-7451 on June 23,1983.
. DATE PROBLEM 1 REPORTED:
June 30,1983, CP&L (N. 3. Chiangi) notified th'e NRC (A. Hardin) that this item was reportable per the provisions of 10CFR50.55(e).
and 10CFR21.
SCOPE OF PROBLEM:
The deficiency involves a total of 44 NTC relay. cards for Unit 1.
SAFETY-IMPLICATION:
Intermittent contact bounce of the NTC card may recult in signal saturation of the downstream RTD amplifier (NRA) card in.the T hot and T -cold circuits of the Westinghouse -7300 process protection system. This could result in a delay in the initiation of the overtemperature - Delta T and overpower - Delta T reactor trips.
REASON DEFICIENCY 15 REPORTABLE:
This item is reportable because these reactor trip delays could delay or prevent safe shutdown of the plant when required.
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CORRECTIVE.
- ACTION:
The NTC relay cards were modified at the site per Westinghouse requirements.
PREVENTATIVE MEASURE: -
In order to meet construction schedules, Westinghouse shipped the
~ 7300 Process Protection System cabinets to the SHNPP site without completing the seismic qualification testing on the NTC cards. Upon completion of these tests, it was discovered that NTC -. cards could not pass the seismic testing.
Westinghouse notified CP&L promptly of this problem and made the necessary design changes to rectify the situation..Therefore, the NTC card problem was discovered during design evolution and does not require preventative measures.
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