ML20138Q516
| ML20138Q516 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/13/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-405, REF-PT21-85, REF-PT21-86-017-000 213, HO-850479-(), HO-850479-(O), PT21-86-017-000, PT21-86-17, NUDOCS 8512270274 | |
| Download: ML20138Q516 (4) | |
Text
0 CD&L Carolina Power & Light Comp aLu-SHEARON HARRi NUCLEAR PROJECT P. O. Box 165 New Hill, North Carolina 27562 December 13, 1985 File Number:
SHF/10-13510E Letter Number: H0-850479 (0)
Dr. J. Nelson Grace NRC-405 United States Nuclear Regulatory Corrmission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KV - UNIT 1 UNDETECTABLE FAILURES IN ENGINEERED SAFETY FEATURES ACTUATION SYSTEM, ITEM 213
Dear Dr. Grace:
Attached is our final report on tr.. subject item, which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on April 24, 1985. With this report, Carolina Power & Light l
Company considers this matter closed.
If you should have any questions concerning this matter, please do not hesitate to contact me.
Yours very truly, f$hW R. A. Watson Vice President Shearon Harris Nuclear Power Plant MW:jsb Attachment cc: Messrs. C. Maxwell (NRC-SHNPP)
I J. M. Taylor (NRC)
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.3-CAROLINA POWER & LICitT CGtPANY SHEARON liARRIS NUCLEAR POWER PLANT UNIT 1 FINAL REPORT r.
UNDETECTABLE FAILURE IN ENGINEERED SAFETY FEATURES ACTUATION SYSTDI ITDI 213 l
DECDiBER 3,1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR, PART 21
s S UBJECT:
Shearon Harris Nuclear Power Plant, Unit 1 10CFR50.55(e) and 10CFR, Part 21, reportable deficiency in the design of the Engineered Safety Features Actuation System's (ESFAS) capability to determine the status of the Reactor Trip Breaker purchased under Purchase Order NY-435002, Westinghouse Shop Order 386.
ITEH:
The P-4 permissive from the reactor trip breakers to the ESEAS.
SUPPLIED BY:
Westinghouse Electric Corporation, Pittsburgh, Pennsylvania NATURE OF DEFICIENCY:
The subject. Unit i equipment has been received and installed at the Shearon Harris plant. Basic equipment design is not unique to the Shearon Harris plant.
Carolina Power & Light was notified of the deficiency by Westinghouse letter (CQL-8695) dated March 28, 1985.
An undetectable failure of the ESFAS exists which would prevent terminating safety injection or switchover from the safety injection phase to recirculation phase.
DATE PROBLFM REPORTED:
On April 24, 1985, CP&L (N. J. Chiangi) notified the NRC (Mr. A. Hardin) that this item was reportable under the provisions of 10CFR50.55(e) and 10CFR, Part 21.
SCOPE OF PROBLIN:
The reactor trip breakers provide a P-4 permissive to the ESFAS which will enable or disable the capability to manually reset and block safety injection.
The deficiency exists in the ability to block safety injection, or in the blocking of safety injection remaining af ter reset of the reactor trip breakers.
SAFETY IMPLICATIONS: The inability of the ESFAS to determine the status of the reactor trip breakers could result in the blocking of safety injection, or the blocking of safety injection could remain af ter resetting the reactor trip breakers and returning the plant to power, t
o e.
REASON DEFICIENCY IS REPORTABLE: Portions of the Engineered Safety Features Actuation System could be rendered inoperable.
CORRECTIVE ACTION:
Westinghouse has redesigned the circuitry associated with the on-line testing of the P-4 permissive and has sub-mitted this to CP&L by Field Change Notification (COLM-10650).
CP&L has completed the installation and testing of the circuit modifications necessary to correct this design error.
FINAL REPORT:
CP&L considers this item closed.
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