ML20205A423
| ML20205A423 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 04/11/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-349, REF-PT21-85, REF-PT21-85-228-000 183, PT21-85-228, PT21-85-228-000, NUDOCS 8504250515 | |
| Download: ML20205A423 (4) | |
Text
F Cp&L Carolina Power & Light Company
' MPR l7 N0 : 2 2 P. O. Box 101, New Hiii, NC 27562 A pril 11,1985 Dr. 3. Nelson Grace NRC-349 United States Nuclear Regulatory Commission Region Il 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1
. POTENTIAL OVERPRESSURIZATION OF THE COMPONENT COOLING WATER SYSTEM, ITEM 183
Dear Dr. Grace:
Attached is our second interim report on the subject item, which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on August 13, 1984. CP&L is pursuing this matter, and it is currently projected that corrective aciton and submission of the final report will be accomplished by October 31,1985.
Thank you for your consideration in this matter.
Yours very truly,
- Mtf &
R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP: sac Attachment cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) j[k42ggh$$o gQ O
S I
XEX-sel3/1-OS5
t CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 SECOND INTERIM REPORT POTENTIAL OVERPRESSURIZATION OF THE COMPONENT COOLING WATER SYSTEM ITEM 183 April'lI,1985 REPORTABLE UNDER 10CFR50.55(e)
AND 10CFR21 XEX-sel3/3-OSS
SUBJECT:
10CFR50.55(e) and 10CFR21 Reportable Item Shearon Harris Nuclear Power Plant Potential Overpressurization of the Component Cooling Water System.
ITEM:
Component Cooling Water System for SHNPP Unit 1.
SUPPLIED B_Y_:
Westinghouse Water Reactor Division.
NATURE OF DEFICIENCY:
Westinghouse notified the NRC under 10CFR21 on July 12, 1984, of a reportable item associated with the design of the Westinghouse-supplied component cooling water system. An overpressure condition could result from closure of the surge tank vent valve on a high radiation signal from the radiation directors within the component cooling water system. Closure of the vent valve could result in an increase in pressure in the surge tank due to a system inleakage or an increase in system heat load. The pressure in the surge tank could then increase to the set pressure of the surge tank relief valve. System overpressurization of up to 170% of the design pressure may then occur downstream of the CCW pumps as a result of pump developed head.
DATE PROBLEM WAS CONFIRMED
-TO EXIST:
Westinghouse letter CQL-8065 dated July 23, 1984, and received July 27,1984.
DATE PROBLEM REPORTED:
N. 3. Chiangi notified the NRC (Mr. A Hardin) that this item was reportable under 10CFR50.55(c) and 10CFR21 on August 13, 1984.
SCOPE OF PROBLEM:
Unit 1 Component Cooling Water System (both trains).
SAFETY IMPLICATIONS:
Overpressurization and potential loss of both component cooling water trains.
REASON PROBLEM IS REPORTABLE:
Overpressurization could lead to a efegraded safety condition and l
loss of an ESF system.
XEX-sel 3/4-OSS
p.
.. ?
e
~ CORRECTIVE ACTION: -
As automatic isolation of the surge tank vent line is not an essential function, Westinghouse has recommended disabling the vent valve circuitry, yet maintaining annunciator alarm on the main control board. In the long term, the vent valve could be locked open or. removed, and the surge tank relief valve could be removed. CP&L, Westinghouse, and Ebasco are still investigating this matter in order to determine the appropriate course of action to be taken.
- FINAL REPORT:
A final report will not be available until the appropriate corrective action is determined and implemented, which is currently expected to be October 31,1985.
I i.
L l
l XEX-sel3/5-OSS