05000260/LER-1980-003, Updated LER 80-03L/01X-1:on 800914,during EOC-3 Fuel Shuffling Operations,Fuel Assemblies Tz 758 & Tz 399 Discovered Misoriented 90 Degrees.Caused by Misorientation of 16 Fuel Assemblies During Previous Refueling Outage

Updated LER 80-03L/01X-1:on 800914,during EOC-3 Fuel Shuffling Operations,Fuel Assemblies Tz 758 & Tz 399 Discovered Misoriented 90 Degrees.Caused by Misorientation of 16 Fuel Assemblies During Previous Refueling Outage

ML18025B130
Person / Time
Site:	Browns Ferry
Issue date:	10/09/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B128	List: 05000260/LER-1980-003, Updated LER 80-03L/01X-1:on 800914,during EOC-3 Fuel Shuffling Operations,Fuel Assemblies Tz 758 & Tz 399 Discovered Misoriented 90 Degrees.Caused by Misorientation of 16 Fuel Assemblies During Previous Refueling Outage 05000260/LER-1980-037, Forwards Updated LER 80-037/01X-1
References
LER-80-037-01X, LER-80-37-1X, NUDOCS 8010150525
Download: ML18025B130 (5)

LER-1980-003, Updated LER 80-03L/01X-1:on 800914,during EOC-3 Fuel Shuffling Operations,Fuel Assemblies Tz 758 & Tz 399 Discovered Misoriented 90 Degrees.Caused by Misorientation of 16 Fuel Assemblies During Previous Refueling Outage

Event date:
Report date:
2601980003R00 - NRC Website

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'NRC FOIM 366 (7 77)

UPDATE RE RT - PREVIOUS REPORT Se tember 1980 Ll CONTROL BLOCK:

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Durin EOC-3 fuel shufflin o erations it was noted that fuel assemblies TZ 758 and TZ 399 were misoriented 90 There was no previous occurrences.

There was no 0

danger or hazard to the public.

See Technical Specification 2.1 and 3.5.K.

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CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS Q27 o

During the previous refueling outage (BOC-3) 16 fuel assemblies were misoriented.

Subsequent rework left two 7 x 7 bundles in the misoriented position.

A later lreview of the BOC-3 core verification tapes confirmed there were no other misoriented 3

fuel assemb 1ies.

Units 1 and 3 core verificat ion tapes wi11 be verified.

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Tennessee Valley Authority Browns Ferry Nuclear Plant Form BF-17 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION I

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Technical Specification Involved Reported Under Technical Specification 6.7;2.a(9)

~l Identification and Descri tion of Occurrence:

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

Conditions Prior to Occurrence:

Unit 1 1055 MWe 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.

Describe.

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arent Cause of Occurrence:

V'he 16 misoriented fuel assemblies were loaded out of proper orientation and core verification procedures detected the errors.

Rework instructions failed to accomplish the required orientation of the two fuel assemblies.

Anal sis of Occurrence; See attachment

Corrective Action

Verification and reorientation procedure for fuel loading verification have been made.

Procedural changes include the requirements that rework will be documented with second party verification.

Failure Data:

NA Retention:

• Revision:

eriod - Lifetime; Responsibility - Administrative Supervisor

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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 MCPR for the limiting event is the safety limit of 1.07.

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 type, 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 assemblies are scheduled to be removed and will not be reloaded for BOC-4.