ML20024D149

Updated LER 82-003/01T-0:on 820128,RCS Leakage Calculations Showed Unidentified Leakage at Rate Greater than 1 Gpm. Caused by Thermally Induced Cyclic Failure.New Valve Will Be Installed in Improved location.W/830726 Ltr

ML20024D149
Person / Time
Site:	Crystal River
Issue date:	07/26/1983
From:	Charles Brown, Westafer G FLORIDA POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
3F-0783-21, 3F-783-21, LER-82-003-01T, LER-82-3-1T, NUDOCS 8308030210
Download: ML20024D149 (3)

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l. IMode 3. At 1830 on January 29, 1982, while performing a visual inspection i E Ito identify leakane source, an RCS pressure boundary leak was discovered in I s a Ithe valve body of MUV-43. These events were contrary to T.S. 3.4.6.2. The i o 7 l plant was cooled down to Mode 5. This is the first occurrence concerning i g.EU IMUV-43 and the second report under this Specification. l l =- .o. _ .co. .m.

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rum IThe cause of this event is attributed to thermally induced cvelic fatigue. I i i IMUV-43 was removed for failure analysis. A new valve will be installed in I ggs Ian improved location. All four ejection lines were visually inspected and i san iNDE'd. A detailed report describing the investigations and repairs was sub-l <

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NAh8E oP PnEPAnER Charles G. Brown ,, ,g. (904) 795-6486 8308030210 830726 PDR ADOCK 05000302 S PDR

, _ , a SUPPLEMENTARY INFORMATION REPORT NO: 50-302/82-003/01T-1 FACILITY: Crystal River Unit #3 REPORT DATE: July 26, 1983 -

OCCURRENCE DATE: January 29,1982 IDENTIFICATION OF OCCURRENCE:

A Reactor Coolant' pressure boundary leak was discovered in MUV-43, creating an event contrary to Technical Specification 3.4.6.2.

CONDITIONS PRIOR TO OCCURRENCE:

MODE I (84% FULL POWER).

DESCRIPTION OF OCCURRENCE:

While performing a visual inspection of MUV-43 for a possible bonnet leak, a circumferential crack was discovered in the valve body, adjacent to the safe end weld on MUV-43, with some through-wall failure. MUV-43 was removed for failure analysis.

DESIGNATION OF APPARENT CAUSE:

The cause of this event is attributed to thermally induced cyclic fatigue.

ANALYSIS OF OCCURRENCE:

There was no ef fect upon the health or safety of the general public.

CORRECTIVE ACTION:

MUV-43 and related piping was replaced. Related areas of all four (4) injection lines were inspected to assess the scope of the problem. A detailed report describing Florida Power Corporation's investigations and repairs was submitted to Mr. 3. P. O'Reilly on April 30,1982.

FAILURE DATA:

This is the first occurrence concerning MUV-43, and this is the second event reported under this Specification.

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July 26,1983 3F-0783-21 Mr. James P. O'Reilly Regional Administrator, Region II Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, GA 30303

..ubject: Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Licensee Event Report No.82-003

Dear Mr. O'Reilly:

Enclosed is Licensee Event Report No.82-003 and the attached supplementary information sheet, which are submitted in accordance with Technical Specification 6.9.1.8.i. This report supplies supplementary information to our initial report dated February 12,1982.

Should there be any questions, please contact this office.

Sincerely, G. R. Westafer Manager Nuclear Licensing and Fuel Management AEF:mm Enclosure cc: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555

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General Office 32o1 Thirty-fourtn street soutn . P O. Box 14042, st. Petersburg Fionda 33733 e 813-866-5151 //