ML20207T111

Special Rept 87-1:on 870303,increase in Containment Sump Leak Rate Noted.Caused by Pitting Corrosion on Welded Joint Between Elbow & Spoolpiece.New Spoolpiece Fabricated from Stainless Steel & Installed

ML20207T111
Person / Time
Site:	Salem
Issue date:	03/16/1987
From:	Zupko J Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
87-1, IEB-80-24, NUDOCS 8703230202
Download: ML20207T111 (3)

Text

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O PSEG

- Public Service 4 Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generaf;ng Station March 16, 1987 U. S. Nuclear Regulatory Commission

' Document Control Desk Washington, DC 20555 Dear Sir SALEM GENERATING STATION LICENSE NO. DPR-70 DOCKET NO. 50-272 UNIT NO. 2 REPORT 87-1 SPECIAL REPORT This Special Report describes the circumstances surrounding a Service Water leak discovered in the Unit 1 containment. This report is being submitted in accordance with the reporting requirements of IE Bulletin 80-24.

Sincerely yours,

^

b 8703230202 870316 2 J. M. Z pko, .

DR ADOCK 0500 General Manager-Salem Operations

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lI The Energy People $P

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SPECIkL REPORT-NUMBER'87-1 PLANT IDENTIFICATION:

S21em'_ Generating Station - Unit'1

- Public Service Electric & Gas Company Hancock!s Bridge, New Jersey 98938 i

IDENTIFICATION OF OCCURRENCE:

SERVICE WATER LEAK INSIDE CONTAINMENT - NO. 11 CONTAINMENT FAN COIL

-UNIT SPOOLPIECE LEAK DUE TO CORROSION Event Date(s): 93/92/87 Report Date 93/16/87 This report was initiated by Incident Report No.87-979

CONDITIONS PRIOR TO OCCURRENCE

Mode 1 - Rx Power-75% - Unit Load 859MWe'

DESCRIPTION OF OCCURRENCE:

'On March 3, 1987, during routine power operation, the shift. noticed 4

an increase in containment sump leak rate from .26 gpm to .64 gpm. A 4

Reactor Coolant System (RCS) Inventory did not indicate a leak from i

the Chemical Volume and Control System (CVCS) or the RCS. A containment entry was performed and it was discovered that No. 11 Containment Fan Coil Unit (CFCU) had developed a service water leak in a weld on a'three inch, cement lined, carbon steel inlet spoolpiece. The CFCU was isolated and Technical Specification Action 3.6.2.3.a was entered. The NRC was notified at 1941 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.385505e-4 months <br /> the same

-day.

APPARENT CAUSE OF OCCURRENCE:

Upon investigation, indications of pitting corrosion were found in the vicinity of the leak. The indications were found in a fifteen degree (150) section of the three hundred and sixty degree (3690) i welded joint between an elbow and straight section of the i spoolpiece. The entire spoolpiece was removed'and cut open to exa ine for further evidence of corrosion in other welded joints.

Some evidence of localized corrosion was found. The cement lining of the elbow and straight section of piping was intact and in good condition.

ANALYSIS OF OCCURRENCE:

There currently exists a continuing program of low level chlorination for the service water system to combat biofouling and corrosive microbiological organisms. We are aware of the corrosion problem and have a program established to investigate and replace affected piping with piping made from more corrosion resistant materials. Additional research is continuing in this area.

UNIT l' SPECIAL REPORT 87-1 AMALYSIS OF OCCURRENCE: fcont'd)

An increase in containment sump inleakage is the primary indication of the development of RCS or other primary system leakage.

Continuous monitoring of the sump inleakage allows early detection of a potential problem and provides a basis for initiation of

, appropriate actions to identify, isolate, and repair the leak.

Performance of an RCS water inventory balance in conjunction with a containment entry to. locate the' source of the inleakage is the appropriate action.

The unavailability of one CFCU does'not significantly affect the ability to provide containment: cooling. During normal operation there are one or more idle CFCUs, depending on containment

! temperature. During an accident condition, the CFCUs provide one l hundred percent (100%) redundancy to the Containment Spray System for cooling and depressurizing the containment.

CORRECTIVE ACTION:

A new spoolpiece was fabricated from stainless steel and installed.

We have a program established to investigate and replace affected piping with piping made from more corrosion resistant materials.

Pieces of the the failed'spoolpiece have been sent to a laboratory to-determine the failure mechanism. A supplemental report will be submitted upon conclusion of the investigation.

P Ge eral Manager -

Salem Operations RKH:pc SORC Mtg.87-916 l

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