05000260/LER-1980-037-01, /01L-0:on 800914,during Fuel Shuffling Operations, Fuel Assemblies Tz 758 & Tz 399 Were Found to Be Misoriented 90 Degrees.Caused by Operator Error.Corrective Action Included Improved Verification Techniques

/01L-0:on 800914,during Fuel Shuffling Operations, Fuel Assemblies Tz 758 & Tz 399 Were Found to Be Misoriented 90 Degrees.Caused by Operator Error.Corrective Action Included Improved Verification Techniques

ML18025B105
Person / Time
Site:	Browns Ferry
Issue date:	09/26/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B103	List: 05000260/LER-1980-037-01, /01L-0:on 800914,during Fuel Shuffling Operations, Fuel Assemblies Tz 758 & Tz 399 Were Found to Be Misoriented 90 Degrees.Caused by Operator Error.Corrective Action Included Improved Verification Techniques
References
LER-80-037-01L, LER-80-37-1L, NUDOCS 8010030373
Download: ML18025B105 (4)

LER-1980-037, /01L-0:on 800914,during Fuel Shuffling Operations, Fuel Assemblies Tz 758 & Tz 399 Were Found to Be Misoriented 90 Degrees.Caused by Operator Error.Corrective Action Included Improved Verification Techniques

Event date:
Report date:
2601980037R01 - NRC Website

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0 OB 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO During EOC-3 fuel shufflin operations it was noted that fuel assemblies TZ 758 and

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TZ 399 were misoriented 90 There was no previous occurrences.

There was no danger O77 hazard to the public. 'ee Technical Specification 2.1 and 3.5.K.

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERE1AO EVENT YEAR RFPOAT NO.

CODE TYPE NO.

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0 21 22 23 74 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHhIENT NPAD 4 PRIME COLIP.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 D

During the previous refueling outage (BOC-3) the two 7 x 7 fuel assemblies were improperly oriented.

A subsequent review of unit 2 BOC-3 core verification ta es confirmed there were no other misoriented fuel assemblies.

Units 1 and 3 core load 3

video tapes will be reverified.

Core verification procedures will be improved to METHOD OF DISCOVERY

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NAME OF PREPAIIER prevent recurrence.

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10 NA DISCOVERY DESCRIPTION 32 Operator observation LOCATIONOF RELEASE NRC USE ONLY 68 69 PHONE:

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Tennessee Valley A ority Browns Ferry Nuclear Plant Form BF-.17 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION 2.].

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Technical Specification Involved 6.7.2.a (9)

Reported Under Technical Specification Date of Occurrence 9/14/80 Time of Occurrence 1900 Unit ~

Identification 'and Descri tion'of-Occurrence:

Fuel assemblies TZ 758 in cgre location 15-26 and TZ 399 in. core location 29-28 were found to be rotated 90 from their correct orientation.

Conditions Pr ior to Occurrence:

Unit 1 -1055 Kfe Unit 2 - refuel shutdown

- Unit 3 Shutdown maintenance outage Action specified in the Technical Specification Surveillance Requirements met due to ino erable e ui ment

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Describe.

NA Anal sis of Occurrence:

See attachment

Corrective Action

Improve verification techniques and limit continuous viewing time of core loading viodeo tapes to approximately 30 minutes Failure Data:

NA eriod - Lifetime; Responsibility - Administrative Supervisor c

~Retention:

• Revision:

c~'4 c

A arent Cause of Occurrence:

o The two misoriented fuel assemblies were loaded 90 out of proper orientation and were detected'uring initial core reloading verification but not corrected.

According to Supplemental Reload Licensing document NEDO-24169A the limiting fuel loading error is a rotated 8 x 8 (8D274) fuel assembly and assumes a

rotation of 180 The MCFR for the limiting event is the safety limit of 1.07.

0 Any other misorientation would result in an MCPR greater than 1.07.

The misoriented fuel assemblies were both high exposure original 7 x 7 (7D250).

Since both subject fuel assemblies were not of the limiting typ'e, were sufficiently separated to prevent interaction, and since there were no significant transients during the cycle, the safety limit of 1.07 MCPR was not exceeded.

Of the two fuel assemblies, the process computer indicates that TZ 758

.at location 15-26 made the closest approach to its operational limit for 7 x 7 fuel of 1.33 MCPR on the following three occasions:

7/10/79 MCPR = 1.40 1/1/80 MCPR ~ 1.39 6/30/80 MCPR = 1.40 All operation was within the bounds of the reload licensing submittal.

Both of the fuel asemblies are scheduled to be removed and will not be reloaded for BOC-4.