ML20087P147

Second Interim Part 21 Rept,Item 152 Re Capstan Spring Tang Failure of Pacific Scientific Co Mechanical Shock Arrestors.Initially Reported on 831108.Final Rept Expected by 840930

ML20087P147
Person / Time
Site:	Harris
Issue date:	03/30/1984
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-201, REF-PT21-84-212-000 152, NC-201, PT21-84-212, PT21-84-212-000, NUDOCS 8404060099
Download: ML20087P147 (4)

Text

. ,.,'

• CD&L pg hardM PoN & Light Company memeza:mzmrsct P. O. Box 101, New Hill, N. C. 27562 March 30,1984 Mr. James P. O'Reilly NRC-201 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2S00)

Atlanta, Georgia 30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRE NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 PACIFIC SCIENTIFIC SNUBBERS MODELS PSA-1 AND PSA-3, TrEM 152

Dear Mr. O'Reilly:

Attached is our second interim report on tile subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on November 8,1983. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by September 30,1984.

Thank you for your consideration in this matter.

Yours very truly, W

R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/sh Attachment -

cc: Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)

Mr. R. C. DeYoung (NRC)

OFFICIAL COPY B4[h[OS ,

S

'lI

c.  ;

f CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 l .-

SECOND INTERIM REPORT' PACIFIC SCIENTIFIC SNUBBERS MODELS PSA-1 AND PSA-3 ITEM 152

. MARCH 29, 1984 REPORTA3LE UNDER 10CFR50.55(e)

REPORTABLE UNDER 10CFR21 L

l' T

=>

4 g 4 g -- .-y , . , , - -,m -- = - ,-. - - , ,- -, , , e-- ee,,-

s

.3 .

i

SUBJECT:

Shearon Harris Nuclear Power Plant / Unit No. 1,

'10CFR50.55(e) and 10CFR, Part 21, Capstan spring tang failure for mechanical shock arrestors.

ITEM: Capstan spring component in mechanical shock arrestors.

SUPPLIED BY: Pacific Scientific Company, Anaheim, California.

NATURE OF DEFICIENCY: In September, 1983, Pacific Scientific Company, Anaheim, California advised Southwest Fabrication and Welding,

. Houston, Teras, purchaser for CP&L, of failure of four (4) PSA 1801102-05 shock arrestors. Failure occurred during testing of Pacific Scientific Company's arrestors at Union Electric Callaway Staton by Daniel International personnel. The failed arrestors were returned to Pacific Scientific Company where additional testing was performed on the failed components by "Mettek", Santa Ana, California. Results of the test have been issued in Mettek Report No. PSC130911 dated September 14, 1983.

DATE PROBLEM OCCURRED: Purchaser notified by letter September 21, 1983. CP&L was notified by Southwest Fabrication and Welding by letter dated October 5, 1983.

~

-DATE PROBLEM REPORTED: November 8, 1983 - CP&L (K. V. Hate') notified the NRC (A. Hardin) that this item was reportable under 10CFR50.55(e) and 10CFR, Part 21' .

SCOPE OF PROBLEM: The deficiency involves (102) Unit 1. Type PSA-1 mechanical shock arrestors.

SAFETY IMPLICATIONS: The mechanical shock arrestors are required to ensure that pipe movement, acceleration and displacement are controlled within the design limits during a seismic event, REASONS.

DEFICIENCY IS REPORTABLE: Failure of the capstan spring tang would result in failure of the shock arrestor to function properly during

'a seismic event. This would result in the potential loss of operation of seismically designed piping during a sesismic event.

'; t -

Action is being effected by Pacific Scientific Company with~the spring manufacturer.

-CORRECTIVE-ACT!0N: Mechanical shock arrestors identified by Pacific Scientific Company as being part of the identical lot and in critical systems of failed items will be returned to the vendor for capstan spring inspection and replacement as required.

Preventive measures and additional corrective action must be obtained from Pacific Scientific after consulting the spring manufacturer.

Presently CP&L is waiting on the vendor Southwest Fabricating, to reply on a contractual matter concerning payment for the capstan spring inspection and replacement. Also, an engineering evaluation is being made for another possible solution; CP&L is considering sending Pacific Scientific only those snubbers which will be in-critical systems. This idea is based on a service report from Pacific Scientific which states that only 15% of the 2,000 possibly detective snubbers tested thus far have failed. Pacific Scientific's reference point.for these tests is based on 533 full load cycles (approximately equal to two (2) earthquakes over a forty-year period). Therefore, CP&L is considering sending only those snubbers back which are in critical systems.

FINAL REPORT: A' final report will be issued once the corrective action described above is completed. It is projected that the submittal date will be September 30, 1984.

t is