ML20136H564
| ML20136H564 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/30/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-411, CON-NRC-411-(O), REF-PT21-85, REF-PT21-86-002-000 179, HO-850487-(O), PT21-86-002-000, PT21-86-2, NUDOCS 8601100063 | |
| Download: ML20136H564 (4) | |
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Cp&L Carolina Power & Light Company ed JAM 3 P 2 ' il 2 SHEARON HARRIS NUCLEAR PROJECT P. O. Box 101 New Hill, North Carolina 27562 December 30, 1985 File Number: SHF/10-13510E Letter Number: HO-850487 (0)
Dr. J. Nelson Crace NRC-411 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA-POWER & LICHT COMPANY
~SHEARON. HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 IN-CORE FLUX MAPPING SYSTEM -
SYSTEM INTERACTIONS, ITEM 179
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 January 16, 1985. With this report, Carolina Power & Light Company considers this matter closed.
If you should have any questions concerning this matter, please do not hesitate to contact me.
Yours very truly, P.. A. Watson Vice President Shearon Harris Nuclear Power Plant MW:ajj cc:
Mr. C. Maxwell (NRC-SHNPP)
Mr. J. M. Taylor (NRC)
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o CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 FINAL REPORT >'
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IN-CORE FLUX MAPPING SYSTEM -
SYSTEM INTERACTIONS ITEM 179 DECEMBER 17. 1985 REPORTABLE UNDES 10CFR50.55(e) AND 10CFR21 i
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SUBJECT:
Shearon Harris Nuclear Power Plant Unit No. I 10CFR50.55(e) and 10CFR. Part 21 reportable deficiency in the interaction scenario postulating portions of the nonsafety flux mapping system falling on the in-core instrumentation tubing / seal table during a seismic event.
ITEM:
Seismic interaction scenario of the In-Core Flux Mapping System.
SUPPLIED BY:
Westinghouse. Nuclear Energy Systems. Pittsburgh, Pennsylvania NATURE OF DEFICIENCY:
An interaction scenario which postulates portions of the SHNPP flux mapping system, which is a nonouclear safety system, falling on the in-core instrumentation tubing / seal table during a seismic event damaging the in-core instrumentation tubing / seal table and causing a small break LOCA. This potential interaction is possible because the SHNPP flux-mapping aystem is,
installed directly above the in-core instrumentation tubing / seal table.
DATE PROBLEM OCCURRED:
During preparation of the installation procedure for the in-core flux mapping system, the question was raised as to if this system should be supported per i
Inquiry was transmitted to Westinghouse on May 14, 1984 to have them determine the validity of the concern. Westinghouse responded on May 30. 1984 by confirming that a potential interaction does exist.
DATE PROBLEM REPORTED:
June 22.1984 CP&L (N. J. Chiangi) notified the NRC (Mr. D. Verre111) that this item was potentially reportable under 10CFR50.55(e) and 10CFR Part 21.
January 16. 1985, CP&L (F. E. Strehle) notified the NRC (Mr. A. Hardin) that this item was reportable i
under 10CFR50.55(e) and 10CFR. Part 21.
SCOPE OF PROBLEM:
The deficiency involves the SHNPP in-core flux l
mapping and instrumentation tubing / seal table j
systems.
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SAFETY IMPLICATION:
Small break LOCA after a seismic event would degrade the ability of the plant to be safely shut down.
REASON DEFICIENCY IS REPORTABLE: This item is reportable because it could impede the safe shutdown of th,e plant.
CORRECTIVE i
ACTION:
The design for the moveable portion of the In-core Flux Mapping System has been reviewed and design modifications (Field Change Request AS-10316 and Design Change Notice 650-954) have been issued to qualify the system to the requirements of Regulatory Guide 1.29.
With the issuance of the referenced design documents which correct the previous design deficiency, this matter is considered resolved.
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