View source for PNO-II-85-102, crack-like Indications Discovered on Surface of Cross Assembly Which Ties 24-inch Discharge Piping of Recirculation Pump to Jet Pump 16-inch Ring Supply Header. Util & Nutech Performing Evaluation

{{Adams
| number = ML20134A861
| issue date = 10/31/1985
| title = PNO-II-85-102:crack-like Indications Discovered on Surface of Cross Assembly Which Ties 24-inch Discharge Piping of Recirculation Pump to Jet Pump 16-inch Ring Supply Header. Util & Nutech Performing Evaluation
| author name = Carroll R, Crowley B
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| addressee name = 
| addressee affiliation = 
| docket = 05000416
| license number = 
| contact person = 
| document report number = PNO-II-85-102, NUDOCS 8511110066
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 2
}}
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October 31, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-85-102 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance.      The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this date.
FACILITY: Mississippi Power & Light Company           Licensee Emergency Classification:
Grand Gulf Unit 1                               Notification of Unusual Event Docket No. 50-416                               Alert Port Gibson, Mississippi                        Site Area Emergency General Emergency X Not Applicable

==SUBJECT:==
CRACK INDICATIONS ON SURFACE OF RECIRCULATION PIPING Mississippi Power & Light (MP&L) has detected numerous crack-like indications on the surface of the cross assembly which ties the 24-inch discharge piping of one recirculation pump to the piping's associated jet pump 16-inch ring supply header.
The indications were disclosed by dye penetrant testing after MP&L's contractor, Nutech Engineering Inc., had performed induction heat stress improvement work on selected recirculation piping welds. These indications are circumferentially located within a seven-inch band below the cross-to-cap weld area and within a six-inch band above the cross-to-discharge piping weld area. The base metal is more than two inches thick at these locations.
The indications are about three-quarters of an inch long and a quarter-inch deep, with the exception of one indication in the lower six-inch band which is about three and a half inches long. MP&L believes they are related to the induction heat stress improvenent process. Grano Gulf Unit I has been shut down for scheduled maintenance since October 13.
Region II is monitoring MP&L and Nutech's continuing evaluation, and is keeping the Offices of Nuclear Reactor Regulation and Inspection and Enforcement advised.
MP&L is prepared to respond to media inquiries.
The State of Mississippi has been infonned.
This information is current as of 2:30 p.m. (EST) today.

==Contact:==
R. Carroll, 242-5543                             B. R. C rowl ey, 242-5579 0
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