PNO-II-84-086, during Insps Per Generic Ltr 84-11, IGSCC Detected on Inboard Side of Outboard Isolation Valve on RWCU Sys

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PNO-II-84-086:during Insps Per Generic Ltr 84-11, IGSCC Detected on Inboard Side of Outboard Isolation Valve on RWCU Sys
ML20204H413
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 11/07/1984
From: Butcher R, Girard E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
GL-84-11, PNO-II-84-086, PNO-II-84-86, NUDOCS 8411120286
Download: ML20204H413 (1)


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November 7,1984 s

-PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL' OCCURRENCE PNO-II-84-86 Q

~This -preliminary notification constitutes EARLY notice of. events of POSSIBLE safety or ipublicLinterest 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: Tennessee Valley Authority Licensee Emergency Classification:

i. ~ Browns Ferry Unit 2. Notification of Unusual Event Docket No. 50-260. Alert Athens, Alabama Site Area Emergency General Emergency X Not Applicable

SUBJECT:

CRACK INDICATIONS IN REACTOR WATER CLEANUP SYSTEM TVA has informed Region II that intergranular stress corrosion cracking has been detected

.on the inboard side'of. the ~ outboard isolation valve on the reactor water cleanup system.

Preliminary . indications show an axial crack three-quarters of an inch long and 50 percent through=the wall.

This ' crack was detected by inspections performed in accordance with Generic Letter 84 during the-current refueling outage of Browns Ferry Unit 2. Cracks have been found and corrected in this system on Unit 1 during the past three years. Unit I will be inspected further during its next refueling outage. Inspections performed during the current

refueling outage on Unit 3 detected ~no indications in the reactor water cleanup system.
Media ~ interest has not occurred. TVA does not plan a news release at this time, but is prepared to respond to inquiries. Region II does not plan a news release.
Th1 State of Alabama has been informed.

The licensee notified the NRC headquarters duty officer of this occurrence by telephone at 5:06 p.m. (EST) yesterday.

This information is current as of 10:30 a.m. today.

Centact: R. C. Butcher, 242-5561 E. H. Girard, 242-4183 DISTRIBUTION:

H. Street MNBB Phillips E/W . ills.- iAIL:

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~ ~ Conn. Zech Air Rights INPO///OS SECY SP NSAC ACRS CA PDR Regions:

Licensee: n /a 7 4

(ReactorLicensees)

Applicable Resident Site /M/$

8411120286 941107 PDR I8E PDR

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