05000260/LER-1980-031-01, /01T-0:on 800811,during Normal Operation,Two Nodes in Fuel Assembly T2 396 Exceeded Upper Boundary Limits for Max Average Planar Linear Heat Generation Rate.Caused by Failure to Incorporate Revised Limits Into Tech Specs

/01T-0:on 800811,during Normal Operation,Two Nodes in Fuel Assembly T2 396 Exceeded Upper Boundary Limits for Max Average Planar Linear Heat Generation Rate.Caused by Failure to Incorporate Revised Limits Into Tech Specs

ML18025B062
Person / Time
Site:	Browns Ferry
Issue date:	08/29/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B061	List: 05000260/LER-1980-031, Forwards LER 80-031/01T-0 05000260/LER-1980-031-01, /01T-0:on 800811,during Normal Operation,Two Nodes in Fuel Assembly T2 396 Exceeded Upper Boundary Limits for Max Average Planar Linear Heat Generation Rate.Caused by Failure to Incorporate Revised Limits Into Tech Specs
References
LER-80-031-01T, LER-80-31-1T, NUDOCS 8009090481
Download: ML18025B062 (3)

LER-1980-031, /01T-0:on 800811,during Normal Operation,Two Nodes in Fuel Assembly T2 396 Exceeded Upper Boundary Limits for Max Average Planar Linear Heat Generation Rate.Caused by Failure to Incorporate Revised Limits Into Tech Specs

Event date:
Report date:
2601980031R01 - NRC Website

text

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 8

EVE'NT DESCRIPTION AND PROBABLE CONSEQUENCES QIO

~During normal operation it was discovered that two nodes in fuel assembly T2 396 Q'ad exceeded 30,000 Mwd/t whi.ch was the upper exposure boundary for MAPLHGR limits.

g ~As a result the daily MAPLHGR check required by T.S. 3.5.L could not be accurately I

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There was no danger to health or safety of public.

No previous occurrence.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27

Cause of event

was failure to request technical specification revision to incorporate the exposure extended MAPLHGR limi'ts for up to 40,000 Mwd/t.

New valves were entered into computer and a proposed T.S. revision submitted.

MAPLHGR values obtained L

after exceeding 30,000 Mwd/t were found to be conservative compared to new limits.

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68 69 PHOEBE:

, Tennessee Valley Authority Browns Ferry Nuclear Plant Form BF-17 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO >r0260 / 803 'echnical Specification Involved Reported Under Technical Specification Date of Occurr ence

/

Time of Occurrence Unit 0900 2

Identification and L)ca~crt tion'oi Occurrence:

It was discovered that two nodes in fuel bundle 23-14 had exceeded 30,000 MWd/t which was the upper exposure boundary for MAPLHGR limits.'s a result the daily MAPLHGR check could not be accurately determined.

Conditions 'Prior to Occurrence:

Unit 1 8 93%

Vnit 2 8 97.%

Unit 3 8 94%

U e

Action specified in the Technical Specification Surveillance Requirements met NA

~A~arent Cau.e of Occurrence:

Failure to modify process computer software to incorporate the exposure extended MAPLHGR limits for up to 40,000 1M/t.

Analysis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.

Corrective Action

The process computer software was modified to incorporate the extended MAPLHGR limits up to 40,000 1Md/t.

The process computer output was inspected to verify the MAPLHGR values checked daily were within limits.

Proposed Tech.

Spec.

Retision was submitted.

Plant procedures were revised to monitor nodal exposures.

,Failure Data:

NA:"Retention:

+Revision:

eriod - Lifetime; Responsibility - AdminisIrative Supervisor

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