ML20198D630
| ML20198D630 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 09/30/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-391, REF-PT21-85, REF-PT21-85-473-000 188, PT21-85-473, PT21-85-473-000, NUDOCS 8511120395 | |
| Download: ML20198D630 (3) | |
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N Carolina Power & Light Company w%,._. 4 3 7J C C<i 3 P. O. Box 101, New Hill, NC 27562 e
September 30, 1985 Dr. J. Nelson Grace NRC-391 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 AIR-OPERATED DIAPHRAGM VALVES-NATURAL FREQUENCIES, ITEM 188
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 September 26, 1984.
With this report, Carolina Power & Light Company considers this matter closed.
If you have any questions concerning this matter, please do not hesitate to contact me.
Yours very truly, R. A. Watson Vice President Shearon Harris Nuclear Power Plant RAW:mj Attachment ec: Messrs. C. Maxwell /R. Prevatte (NRC-SHNPP R. C. DeYoung (NRC) 8511120395 850930
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CAROLINA POWER & LICHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 FINAL REPORT ITT-CRINNELL AIR OPERATED DIAPHRAGM VALVES NATURAL FREQUENCIES ITEM No. 188 September 30, 1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 NBI-NRC-391/3-OS5
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SUBJECT:
10CFR50.55(e) and 10CFR21 Reportable Item, Shearon Harris Nuclear Power Plant Unit 1, ITT-Crinnell Air-Operated Diaphragm Valves Natural Frequencies.
ITEM:
Air-operated Diaphragm Valves for SHNPP Unit 1.
SUPPLIED BY:
Westinghouse Water Reactor Division /ITT-Crinnell.
NATURE OF DEFICIENCY:
Westinghouse notified CP&L in September 1984 that a problem existed with a
number of air-operated diaphragm valves supplied by ITT-Grinnell.
The valves, designed to have frequencies greater than 33 hz, were found by test not to meet this requirement.
Further investigation revealed valves of the same type supplied directly by ITT-Grinnell to CF&L.
These valves are supplied as ASME Class 2 and 3 components.
DATE PROBLEM WAS CONFIRMED TO EXIST:
Westinghouse Letter CQL-8174 dated September 4, 1984, and received September 11, 1984.
PROBLEM REPORTED:
N.
J.
Chiangi notified the NRC (Mr.
A. Hardin) that this item was reportable under 10CFR50.55(e) and 10CFR21 on September 26, 1984.
SCOPE OF PROBLEM:
Twenty-seven (27) NSSS-supplied valves and nine (9)
BOP-supplied valves.
SAFETY IMPLICATIONS:
Potential for increasing piping stresses and support loads in affected piping systems.
REASON PROBLEM IS REPORTABLE:
Erroneous analysis / support of the valves (due to non-rigidity) could have caused the design loads or stresses to be exceeded.
CORRECTIVE ACTION:
CP&L and Ebasco reanalysis of the systems to include the effects of the non-rigid valves has been completed.
A review of the impact on the design as required has now also been completed.
The subject valves have been reclassified as flexible and have been factored into the af fected systems' on-going design process.
Based on this action, we consider this matter resolved.
NBI-NRC-391/4-0S5 L