ML20108F179
| ML20108F179 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/12/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-323, REF-PT21-85, REF-PT21-85-171-000 179, PT21-85-171, PT21-85-171-000, NUDOCS 8503120353 | |
| Download: ML20108F179 (4) | |
Text
e-
.r
. ~
CD&L m,
CypHna Power & Light Company Q
11$,hk 27562 P. O. Box 101 ew February 12,1985 Dr. 3. Nelson Grace NRC-323 United States Nuclear Regulatory Commission Region 11 -
101 Marletta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT 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 an Interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on January 16, 1985. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomp!!shed by December 31,1985.
Thank you for your consideration in this matter.
Yours very truly, b
R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/sae cc Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) h hk 00 g
'OR1CIAE COPY
[G [i(
se7/1
c~.
CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 INTERIM REPORT IN-CORE Fi.fiX MAPPING SYSTEM -
SYSTEM INTERACTIONS ITEM 179 FEBRUARY 8. 1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 DISC 9
SUBJECT:
Shearon Harris Nuclear Power Plant Unit No. I 10CFR50.55(e) and 10CFR. Part 21 reportable l
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 nonnuclear safety system, falling on the in-core instrumentation j
tubing / seal table during a seismic event damaging the l
in-core instrumentation tubing / seal table and causing a small break LOCA. This potential interaction is possible because the SHNPP flux mapping system 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 l
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.
l l
January 16, 1985, CP&L (F. E. Strehle) notified the NRC (Mr. A. liardin) that this item was reportable under 10CFR50.55(e) and 10CFR, Part 21.
t SCOPE OF PROBLEn:
The deficiency involves the SHNPP in-core flux mapping and instrumentation tubing / seal table nystems.
DISC 9
[
- eo SAFETY IMPLICATICN:
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 the plant.
CORRECTIVE ACTION:
Perform a structural integrity analysis for the portion of the in-core flux mapping system that is i
located above in-core instrumentation tubing / seal table and make the structural modifications required to preclude the potential interaction.
FINAL REPORT:
The design for seismically attaching the moveable portion of the in-core flux mapping system has not been completed. The final report is expected to be issued by December 31, 1985, after the modifications have been implemented.
l l
l l
l I
(
I l
l l
l DISC 9
- -